Build Your Own Greenhouse

Tiberian Growdome System

Are you tired of dealing with so-called organic foods or or vegetables that you know are covered in lethal chemicals? If you are, why not grow your own food? It is not nearly as hard as people make it out to be Growing your own food is one of the most rewarding things that you can do! You are being healthy in two ways; you're growing all-natural foods AND you're staying fit by growing food! This ebook teaches you how to make a simple device from ancient times that allows you to grow the very best food that you can at home! This device is much like a small greenhouse You will be able to control the climate inside to make sure that your plants are always in great weather. Don't go along with the rapidly expanding food prices; start growing your own, and don't play the game of people that want to hurt the food supply with chemicals and genetic engineering! Read more...

Tiberian Growdome System Overview

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Author: Chris Peterson
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My Tiberian Growdome System Review

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I usually find books written on this category hard to understand and full of jargon. But the author was capable of presenting advanced techniques in an extremely easy to understand language.

Overall my first impression of this book is good. I think it was sincerely written and looks to be very helpful.

Laboratory and greenhouse

We have focused on in situ studies in this review, but some results of studies performed in laboratories and greenhouses are listed briefly below as well. Short-term UV-enhancement studies have lasted from six days to three months. The aquatic moss Fontinalis antipyretica showed a decrease in photosynthetic pigments, photosynthesis, and growth, and an increase in dark respiration rate and schlerophylly, with shade samples being more sensitive (Martinez-Abaigar et al. 2003 Numez-Olivera et al. 2004,2005). In Hylocomium splendens, phenological development was accelerated and growth increased (Johanson et al. 1995). Leucobryum glaucum, Mnium hornum, Plagiomnium undulatum, and Plagiothecium undulatum showed decreases in fluorescence (Takacs et al. 1999 Csintalan et al. 2001). In Polytrichum commune, a 15 ozone depletion decreased photosynthetic pigments and UV-absorbing compounds, and increased sucrose and glucose synthesis, but a 25 ozone depletion induced an increase in photosynthetic...

Carbon Dioxide Enrichment In Greenhouses

We are not going to consider greenhouses, because our main concern is the increasing CO2 in the open air, which is occurring due to man's activities. However, in this section we briefly cover elevated CO2 in greenhouses, where CO2 enrichment has long been used to promote growth (Northen and Northen 1973, p. 40). Enriching the greenhouse air with additional CO2 improves the growth of flowers, increases their quality and numbers, and often hastens plants into bloom. The amount that gives best result is about 1200 ppm. Many commercial growers in the United States use CO2 enrichment for such flowers as carnations (Dianthus caryophyllus L.), geraniums (Geranium sp.), roses (Rosa sp.), chrysanthemums (Chrysanthemum sp.), snapdragons (Antirrhinum majus L.), Easter lilies (Lilium longiflorum Thunb.), calla improperly called calla lily (Laurie and Ries 1950, p. 432) (Zantedeschia sp.), gloxinias (Sinningia speciosa Benth. & Hook.), African violets (Saintpaulia ionantha Wendl.), hyacinths...

Upscaling regional emissions of greenhouse gases from rice cultivation methods and sources of uncertainty

One of the important sources of greenhouse gases is the emission of methane from rice fields. Methane emission from rice fields is the result of a complex array of soil processes involving plant-microbe interactions. The cumulative effects of these processes at the level of individual plants influence the global atmospheric composition and make it necessary to expand our research focus from small plots to large landscapes and regions. However, present extrapolations ('upscaling') are tenuous at best because of methodological and practical problems. The different steps taken to calculate regional emission strengths are discussed and illustrated by calculations for a case-study in the Philippines. The applicability of high quality, process-based, models of methane emission at the level of individual plants is limited for regional analysis by their large data requirements. Simplified models can be used at the regional level but are not able to capture the complex emission situation. Data...

Colour differences between fruits grown in greenhouse and open air

Table 15.1 shows the mean extractable value (ASTA units) and tint of paprika obtained from six pepper varieties grown in greenhouse and open air (G mez et al., 1998a). Note that the greenhouse varieties show higher ASTA units and higher tint values in all cases. Table 15.2 gives the values corresponding to the CIELAB colour space co-ordinates (L*, a*, b*), chromatic quotients and chroma for the colour by reflection of the fruits for both growing systems. In the red fruits the greenhouse values for brightness (L*), red (a*) and yellow (b*) components and chroma (C*) are lower, due to the fact that the plant receives less sunlight (G mez et al., 1998a). These lower values reflect darker and duller fruit colours, as expected when taking the physical significance of these parameters into account. Figure 15.1 shows the representative points of the red greenhouse and open air fruit varieties in the colour space CIELAB, making evident the colouring difference. It is observed that the open...

Transpiration Under Greenhouse Conditions

An increase in stomatal conductance causes an increase in transpiration. This is illustrated in Figure 10.1, where there is a positive sign between leaf conductance and transpiration. However, conductance and transpiration are decoupled to some extent, particularly in greenhouses, where insufficient cooling of the leaves through transpiration causes heat damage that occurs at high radiation (Nederhoff et al. 1992). This is explained in Figure 10.1, which depicts a course of events following an increase in CO2 in a greenhouse (Nederhoff 1994, p. 61). High CO2 causes partial stomatal closure (reduced leaf conductance note the negative sign between CO2 and leaf conductance in Figure 10.1). This initially reduces transpiration of leaves, which slightly increases leaf temperature. There is a negative sign between transpiration and leaf temperature in Figure 10.1 because the greater the transpiration rate, the cooler is the leaf temperature. Reduction of transpiration also decreases...

Greenhouse

Increase in yearly productivity per floor area of the closed system is about 10 times that of a standard greenhouse for many kinds of transplants, as explained below and Table 14. 1) The ratio of planting area to floor area is usually 0.8 in the greenhouse, while it is 2.0 to 3.0 in the closed system with use of the multi-shelves (4 or 5 shelves). Thus, planting area per floor area of the closed system is about 2-3 times that of the greenhouse. On the other hand, use of multi-shelves is not practical in the greenhouse using solar light because of obstruction of solar light by the multi-layered shelves. Greenhouse Figure 14. Crisp head lettuce (cv. Cisco) transplants grown for 16 days after sowing in the closed system using 200- and 288-cell trays show wider leaves and shorter hypocotyls than those grown for 16 days after sowing in the greenhouse. Greenhouse Sown on Oct. 18 Figure 15. Cabbage (cv. Kinkei 201) transplants grown for 14 days after sowing under a photoperiod of 16 h d1 are...

In Memoriam Clarence A Bud Ryan

Photo Bud Ryan (right) with his closest colleague Gregory Pearce in 1992. The image shows Bud on one of his frequent visits to the greenhouse to examine tomato plants engineered for altered defense responses. Photo Bud Ryan (right) with his closest colleague Gregory Pearce in 1992. The image shows Bud on one of his frequent visits to the greenhouse to examine tomato plants engineered for altered defense responses.

Cases of B Phytotoxicity

In addition, in a glasshouse experiment with French beans and Rhodes grass, Aitken and Bell 10 used an Australian fly ash (untreated, leached, or adjusted to pH 6.5 and subsequently leached) as an amendment (0 to 70 w w) for a sandy loam soil. They found that, for both species, heavy applications of untreated fly ash (> 30 for beans and 70 for Rhodes grass) resulted in poor plant growth, primarily due to B toxicity. The risk of B phytotoxicity was reduced by leaching the fly ash and even more by pH adjustment and subsequent leaching, prior to soil addition. Boron concentrations in plant tissues of both species were above 100 mg kg-1 for almost all untreated ash treatments and below 100 mg kg-1 for almost all pH adjusted and leached ash treatments.

Recovery of Photosynthesis During Rewetting After Desiccation

Fig. 3.2 Short-term drying (upward facing arrow) and rehydration cycles (water additions at the times of the downward facing arrows) of samples of cyanobacterial mats collected from the floor of a glasshouse in the Botanical Garden of the Technical University of Darmstadt (closed circles), the Schwarzwasser Valley in the Alps at Hirschegg, Austria (open circles), an inselberg near Seguela, Ivory Coast (closed triangles) and limestone rock outcrops on the Paraguana Peninsula, Venezuela (open triangles). During drying qp, Fv Fm and DF Fm were completely lost but recovered in less than 2 h when water was added in the state of zero overt photosynthetic activity. Drawn after the data of Luttge et al. (1995) recovered in two phases with half-times of about 20 min and 2 h. Photosynthetic CO2-fixation was restored in parallel with the first recovery phase of PS II. Restoration of electron transport between PS I and PS II began at around 8 min (Satoh et al. 2002). In the epiphyllous sample...

Physiological Characteristics

Measurement of photosynthesis of glasshouse-grown A. mangium seedlings showed that maximum phoiosynthetic rate was within the range 7-10 nigCCty dm-h at a temperature about 25'C and at a photon flux near 6(X) pinoles-' (Atipanumpai 1989). This phoiosynthetic rate seems low in relation to the fast growth of the spccics. The most productive provenances have not exhibited high photosynthelic rates, indicating that there may be no relationship between phoiosynthetic rate and biomass production in A mangium.

Materials and Methods

The long cell mutant of maize (Zea mays L.) was produced by Dr S. Dellaporta, as previously described (Dellaporta and Moreno, 1994). All the plant lines were maintained in the greenhouse of the Departamento de Gen tica Molecular (IBMB-CSIC, Barcelona). Allelism tests were done according to Sheridan and Clark (1987). All the mutants used in this study except the lc line were obtained from the Maize Genetics Cooperative Stock Center.

Taxonomic revision of Echinacea

We sampled wild populations of each of McGregor's (1968) Echinacea taxa and performed a numerical and cladistic analysis of variation using morphological (and some chemical) characteristics (Binns et al., 2002a). Natural populations were tentatively identified in the field according to McGregor's taxonomy (1968). Voucher specimens were deposited at the Department of Agriculture Ontario Herbarium (Ottawa, Canada) and experimental plants and seed were grown in a greenhouse (Binns et al., 2002a, 2002b, 2002c). Measurements for 81 morphometric traits (binary, quantitative, semiquantitative, and qualitative) were entered in a matrix to determine the degree of relationship and clustering between specimens, without any a priori weighting according to previous taxonomic identification. The data for seven traits were omitted due to missing values, resulting in a data matrix of 321 individuals by 74 characters (traits). An index of overall similarity was calculated for each pair of individuals...

Ozone recovery some outstanding questions

Thus, if chlorine and bromine concentrations fall, and all else remains the same, the ozone layer is expected to recover, albeit slowly. However, all else may not remain the same. For example, a downward trend in the temperatures in the lower stratosphere has been reported (see, for example, Oort & Liu, 1993 SORG, 1996). This could lead to more widespread conditions for the formation of polar stratospheric clouds and, hence, to the conditions for chemical destruction of ozone. The conditions inside the Arctic vortex during the last two winters are particularly intriguing in this context. Both 1994 95 and 1995 96 saw the establishment of record low temperatures in the lower polar stratosphere. We do not know whether these records were the result of purely natural variability or whether they represent some kind of trend (for example, caused by increasing concentrations of greenhouse gases or reduced concentrations of ozone). The next few winters will provide the answer. What is quite...

Mixed cultivar and companion crop interactions

One management approach that has had some success in reducing the negative effects of Fe deficiency chlorosis is companion cropping of susceptible and tolerant species (Rombola et al., 2004 Zuo et al., 2000, 2003, 2004). Explanations of how companion cropping may make Fe more available to susceptible species can be inferred from several studies done in controlled conditions, but their significance is less understood in soil culture (Bar-Ness et al., 1991 Crowley, 2001 Hopkins et al., 1992a, 1992b Tagliavini et al., 2000 Tagliavini and Rombola, 2001). These studies illustrate that improvement in Fe uptake could result from a number of interacting factors such as improved root growth for more extensive root soil interface and concomitant increased reductase activity, H+ release, phyto-siderophore release, and or increase in microbial populations or change in composition to favor Fe solubility. For example, in a greenhouse experiment conducted on calcareous soil (Zuo, 2003), serious...

Us Echinacea germplasm collection

Given the above observations, a few comments should be made on Echinacea systematics. A revision of the McGregor taxonomy (Binns et al., 2002) notwithstanding, I have found McGregor's 1968 classification to clearly distinguish Echinacea species in the greenhouse, phytotron, and field with the exception of the aforementioned natural hybrids. McGregor, who spent 15 years collecting data directly from wild stands of Echinacea, many of which have disappeared (McGregor, 1997), worked in the days prior to the development of phenetics and cladistics and prior to the extensive digging that now characterizes the fragmented and attenuated American prairie. His vast and valuable observations are literally unrepeatable due to wild population loss and decline over the last 35 years. It is unfortunate that taxonomic misunderstanding has arisen (Binns et al., 2002), but this is not attributable to McGregor. Given the power of molecular systematics, the true issue here is whether a morphometric study...

Robert Tcolton And Gjohn Murtagh

High relative humidity appears to be important in achieving high oil yields, but the effect has not been fully quantified. In a glasshouse study, Murtagh and Lowe (1997) found that oil concentration was significantly greater when relative humidity was high (81 min) than when it was low (40 ). Oil concentration in the leaf is known to fluctuate seasonally as well as from day to day (Murtagh and Etherington 1990). The reasons for this are complex and are not fully understood but relative humidity levels seem to be a factor in the generally lower levels of oil in the leaf during the dry winter-spring period. (Drinnan 1997b).

Methods of Study of Plant Responses

There are two general approaches to the study of plant responses. One approach is the carefully designed greenhouse, field or pot experiments, where the observation of plant responses to soil factors are made. The alternative approach is the study of soils and plants in their natural environment. There are a number of drawbacks to the greenhouse experiments, for instance, reduction of time-scale in experiments creates uncertainty as to field relevance although reliable qualitative indications may be obtained (Folkeson et al., 1990). The responses of plants under artificial environmental conditions are usually not representative of the natural conditions (Irgolic and Martell, 1985).

Semi and Nonsterile Techniques

A brief review of several experiments can illustrate a variety of vessels, substrates, inoculum types, and methods of their applications used in non-sterile ECM synthesis techniques. Duponnois and Garbaye (1991) used transparent boxes, rootrainers, Hiko and M containers filled with soil or vermiculite-peat mixture (1 1, v v) for growing Douglas fir seedlings in the glasshouse. Liquid, vermiculite-peat or algi-nate-bead inoculum were applied either by mixing with the substrate before filling the containers or by spreading the inoculum on the well-developed root system. Brunner (1993) synthesized ectomycorrhizae between Picea abies and Hebeloma crustuliniforme in autoclaved cuvettes of stainless steel (15 x 12 x 2 cm) filled with a vermiculite-peat moss mixture. Homogenized mycelium grown in liquid solution was introduced into cuvettes using an inverted pipette. Hogberg et al. (1999) planted Pinus sylvestris seedlings in 0.5-l plastic pots filled with sand inoculated with ten mycelial...

Developing Biocontrol Products for Targeted Markets

Root-knot nematode is a major pest of crops grown in glasshouses and other protective structures, and is an obvious target of such research for a number of reasons. First, the nematode causes problems on a global scale the crops grown in glasshouses are relatively high in value, and the cost of nematode control with fumigants and nematicides is already an accepted component of production costs. Second, the soil environment (particularly moisture and temperature) can be reasonably well controlled while the highly modified state of glasshouse soils (due to practices such as fumigation and intensive tillage) may mean that they are amenable to maintaining an introduced organism in the root zone throughout the life of the crop. Third, biological products can be applied within protective structures in a number of relatively simple ways (e.g. as a seed inoculants, seedling dips, soil drenches or additives to transplant mixes). I therefore suggest that this cropping system should be used as a...

General Characteristics

Unique features of the in vitro environment, in contrast to those of the greenhouse environment, are the presence of sugar in the medium in conventional micropropagation and the absence or low density of microorganisms in the culture vessel. Asepsis of culture vessels containing cultures and medium is required in conventional micropropagation for two reasons. One is to obtain pathogen free plantlets, and the other is to prevent the rapid growth of microorganisms, including non-pathogenic ones, in sugar-containing medium, which can damage or kill the cultures. Thus, culture vessels are kept airtight to prevent microorganisms from entering. This use of airtight vessels with small air volume typically characterizes the in vitro environment in conventional micropropagation. General features of the in vitro environment in conventional micropropagation are shown in Table 1, compared with those of the greenhouse environment. Notable characteristics of the in vitro environment are low flow...

Evidence from field manipulations

The use of simple field manipulation techniques is widespread in Antarctic studies. Most are based around the use of some form of chamber or screen (greenhouse methodologies), which is placed over an area of habitat in order to alter aspects of the thermal and radiation climates. In their simplest form, these can be left in place in remote locations year-round. With more regular access for researchers, and availability of a power source, Greenhouse methodologies have generated very rapid population responses in studies of Antarctic microbes (Wynn-Williams 1993, 1996), and bryo-phytes and phanerogams (Smith 1990, 1993, 1994, 1999), with these responses also linked with changes in invertebrate populations (Kennedy 1994 Convey and Wynn-Williams 2002 Convey et al. 2002). The most rapid or largest responses appear to be obtained in manipulations of more extreme habitats, for instance at higher altitude (Kennedy 1994) or latitude (Convey and Wynn-Williams 2002). Plant species typically...

The Industrial Revolution

The effects on the biosphere have been pervasive. Fuel-powered machines have allowed humans to cultivate more land, consume more resources, and sustain larger populations than was conceivable before the beginnings of this most important revolution. In addition to these effects, the use of fuel has had far-reaching consequences by itself. Wood-fired boilers soon gave way to coal, but not before deforestation of thousands of acres of virgin forests in the rapidly industrializing regions of Europe. Coal mining is a dirty business, and leaves in its wake scars on the landscape that can take generations to heal. More significantly, coal and its replacement, oil, are fossil fuels, the geologic remains of ancient plants that contain carbon removed from the carbon cycle millions of years ago. Burning fossil fuels releases carbon dioxide into the atmosphere, and records show the atmospheric level of CO2 has risen steadily since the beginning of the Industrial Revolution. Carbon dioxide is a...

Green Manures And Organic Amendments

Potential when applied as seed treatments (Akhtar and Mahmood, 1995 1997) and bare-root treatments (Akhtar and Mahmood, 1993 1994) leading some to conclude that compounds found in neem may act as inducers of resistance to some nematodes including M. incognita and Rotylenchulus reniformis (Siddiqui and Alam 1988). Other nematode-suppressive mechanisms of compounds derived from neem include antifeedent, repellent, deterrent, growth disruption, juvenile toxicant, and ovicidal properties (Akhtar, 1998). Testing of neem-based products and development of application techniques for plant-parasitic nematode control is increasing in western countries. There are currently several neem-based pesticides available in the United States for use on certain greenhouse and ornamental crops, with many more available for use in india as insecticides (Akhtar, 2000). A comprehensive review of the nematode suppressive potential of neem products is provided by Akhtar (2000).

Natural and Vegetative Inoculum

Bareroot and container-grown seedlings and cuttings of numerous tree species were inoculated with vegetative inocula of many ECM fungi in greenhouse and nursery experiments. Pisolithus tinctorius (Marx and Bryan 1975 Marx et al. 1982 Marx and Cordell 1989 Vijaya and Srivasuki 1999 Rincon et al. 2001) and genus Laccaria (Mortier et al. 1988 Kropacek and Cudlin 1989 Gagnon et al. 1995 Garbaye and Churin 1997 Parlade et al. 1999 Baum et al. 2002 Gange et al. 2005 Machon et al. 2006) have been the most often tested fungi in inoculation experiments. ECM seedlings or cuttings are produced through inoculation of different growing substrates. Soil and peat mixed with vermiculite or other substrate components - the standard substrates for production of planting stock of forest tree species, are convenient and most frequently used for ECM inoculation.

Maturity and senescence

No such easily determined, visual indicator of physiological maturity has been found for soybean. Howell et al. (1959) noted that soybean seeds reach maximum dry weight and low seed respiration rates when seed moisture concentration ranges from 50 to 60 . However, they did not report a corresponding visual indicator of physiological maturity. A number of researchers have attempted to find a non-destructive, observable cue that may be correlated to physiological maturity in soybean. Crookston and Hill (1978) looked at 11 visual indicators in an attempt to correlate one with physiological maturity. Of the 11 indicators selected, initiation of seed shrinkage and loss of green pigment from the pods were reliable indicators of physiological maturity. TeKrony et al. (1979) noted that low respiration rates, which could be used to estimate the time of physiological maturity, correspond to when seed moisture concentration dropped between 55 and 60 ,...

Functioning of Nonvascular Soil Cover

Lichens and bryophytes are sometimes predominating components of ground cover vegetation. Their impact on the upper soil layer is hardly studied but shows significant influences on nutrients, moisture, and temperature. The knowledge about interaction between ground cover vegetation and soil is important especially in the context of land use changes (Pharo and Zartman 2007 Stofer et al. 2006), production of greenhouse gases (Bubier et al. 1995 Smith et al. 2004), and global warming (Bates et al. 2005 Bergamini et al. 2009 Dorrepaal et al. 2006 Frahm and Klaus 2001 Herk et al. 2002 J gerbrand et al. 2009) since one of the main effects will be modification of evaporation processes, the latter being also one of the poorest studied (Beringer et al. 2001 Douma et al. 2007). For example, forest fragmentation and the disruption of soil vegetation cover push evaporation capacities of the pedo- and biosphere towards adverse water loss. Particularly in the context of global change, fewer but...

Cultivation Systems to Achieve Optimal Growth Monitoring Situations

To enable a controlled variation of environmental parameters, growth monitoring systems have to be put in growth chambers or in controlled conditions of greenhouse facilities such as the Biosphere 2 Center (Walter and Lambrecht 2004) where the setup is protected from advert conditions like wind, rain or dew and where for example the effect of altered atmospheric CO2-conditions can be studied in detail. For root growth, image acquisitions have been performed either in agarose-filled Petri dishes (Beemster and Baskin 1998 Nagel et al. 2006) or in hydroponic cultivation systems using an inclined base plate (Walter et al. 2002b, 2003a). In both systems, roots are situated in a translucent medium allowing optical recording, are well supplied with nutrients and forced to grow in two dimensions only.

Managing forests for carbon sequestration

Converting old-growth forests with high C stocks and low C sequestration rates into young, fast-growing plantations with high carbon sequestration, however, has a negative impact on the net greenhouse gas balance because the large initial loss of carbon cannot be compensated for within a conceivable period of time by the additional carbon sequestration in the growing In general, the overall effectiveness of carbon management as a greenhouse gas mitigation activity in the land use sector depends on the initial status of the ecosystem and the proportional cover of the various forest stages in the landscape. In degraded areas with an open canopy, restoration can result in large carbon gains per hectare (Nabuurs et al, 2007). In contrast, especially in regions with ongoing deforestation, the conservation of carbon stock through the protection of primary forests offers mitigation potential. Similarly, the carbon sequestration potential in young forest landscapes with sustainable forest...

Plants to Ambient Solar UVB

Antarctic and Arctic regions than in other nonpolar latitudes where it is less pronounced and subject to other atmospheric factors such as horizontal and vertical ozone transport. In the Antarctic zone, the complete breakdown of the stratospheric ozone occurs only during few springtime days, but the springtime ozone depletion reaches 50-60 on average (Rozema et al. 2005). This event has occurred uninterruptedly for at least 30 years, leading to a marked increase of the solar UV-B irradiance. Since the 1990s frequent occurrence of the springtime ozone hole over the Arctic also occurs resulting in significant ozone depletion and increasing the UV-B irradiance at the ground level (Rex et al. 2004). Similar to the Antarctic area, the ozone loss over the Arctic area is higher in the early springtime than in the growing plant season (late springtime and summer). The Arctic springtime ozone depletion is lower than the Antarctic one and rarely reaches 40-50 on average (Rex et al. 2004). Also,...

Resource Levels and Meristem Limitation

Donohue and Schmitt (1999) studied allocation patterns of Impatiens capensis in different competitive and light environments in a greenhouse. They observed that genetic trade-offs involving meristem allocation to branching were only expressed at low density. At low density, the genetic correlation between the number of branches and the number of flowers was negative. There was also a negative genetic correlation between the

Conclusions and Future Perspectives

A new approach in fruit orchard management is imposed by the environmental emergencies that are marking this recent period (e.g., soil degradation as a result of erosion and desertification, water shortage, greenhouse effect). In semi-arid Mediterranean lands, the adoption of agricultural systems by means of conventional, non-sustainable techniques causes the reduction of soil organic matter, groundwater contamination, soil deficiency of mineral elements (in particular phosphorus and nitrogen), alkalinization salini-zation and nutritional imbalances in plants. On the other hand, the recent researches on the physiology of fruit trees and on soil chemical and biological fertility in fruit orchards have revealed that sustainable and innovative soil management systems, with a particular emphasis on irrigation, allow to obtain an optimal plant nutritional equilibrium, avoid nutrients accumulation and leaching risks, improve irrigation efficiency and prevent soil erosion and root asphyxia....

Increased Content of Atmospheric CO2

Greenhouse effect and is hence the main driver for global warming. Several studies performed at the Biosphere 2 Center investigated in which way growth behavior of a large stand of the agroforestry model species Populus deltoides was affected by two- and threefold (most extreme scenario envisaged for the year 2100, IPCC 2001) increased concentration of atmospheric CO2 (Murthy et al. 2005 Barron-Gafford et al. 2005 Walter et al. 2005). Plants were cultivated for four years in completely enclosed and climate-controlled biomes of 600 m2 area, 10 m height and 1 m soil depth.

General Characteristics Of In Vitro Microclimate

Plant microclimate refers to the climate in the immediate vicinity of a plant or surrounding the plant inside the culture vessel. Plant microclimate is of primary importance to the plant and differs from the culture room environment. In photomixotrophic micropropagation, the in vitro plant microclimate has unique characteristics compared with the ex vitro or the greenhouse environment, whereas in photoautotrophic micropropagation the in vitro plant microclimate resembles that of the ex vitro or the greenhouse environment as will be discussed in the following sections. Photosynthesis literally means synthesis using light. In nature, all chlorophyll-containing organisms use solar energy to synthesize organic compounds such as carbohydrate that cannot be formed without the input of energy. Energy stored in these molecules can be used later to power cellular processes in the plant and can serve as the energy source for all forms of life. In case of in vitro propagation, plantlets use...

Hybridization and advancement of the generation

Hybridization is performed between superior parents selected on the basis of breeding objectives. These important steps (the selection of parents and hybridization) in breeding programmes have already been described above. In a successful cross, a small pod can be seen after a week. The success rate of hybridization varies from 10 to 75 in soybean, depending upon the experience of the breeder (Fehr, 1987). Generally, hybridization is performed during the normal soybean growing season in the field, although some private companies hybridize in greenhouses throughout the year. After hybridization, the next step is generation advancement to produce the inbred lines. Soybean is a self-pollinated plant. Simply growing different generations will result in selfing to advance the generation to produce inbred lines. Recombinant inbred lines are grown at shuttle breeding stations to minimize the time required to achieve homozygosity in the population. In a large country such as the USA, shuttle...

Manuel Nieves Cordones Fernando Alemn Mario Fon Vicente Martnezand Francisco Rubio

The increasing world population makes high yield crop production a necessity in future agriculture. However, the negative effects of the emission of greenhouse gases into Earth's atmosphere and the resulting climate change may impede reaching this goal. New stresses will appear and the existing ones will be exacerbated. Important plant processes such as the acquisition of K+, which is an essential macronutrient for plants, will be negatively affected. The development of new crop varieties with enhanced capacities in the acquisition of K+, especially under the future environmental conditions, is an important challenge. One of the first steps may be the identification of the K+ uptake systems operating in the roots, which may be later improved to enhance K+ acquisition under stress conditions. Some gene families encoding K+ transporters, that is, the HAKl-type, and channels, that is, the AKTl-type, key pieces for root K+ uptake, have been identified. Members of other families of...

Carbon vs other goods and services

The design of carbon management strategies should consider the trade-offs between these alternative options. Increasing forest ecosystem carbon stocks must be evaluated against increasing the sustainable rate of harvest and transfer of carbon to meet human needs (Nabuurs et al, 2007). The selection of mitigation strategies should minimize net greenhouse gas emissions throughout all sectors affected by these activities. For example, stopping all forest harvesting would increase forest carbon stocks, but would reduce the amount of timber and fibre available to meet societal needs. Other energy-intensive materials, such as concrete, aluminium, steel and plastics, would be required to replace wood products, resulting in higher greenhouse gas emissions (Gustavsson et al, 2006).

Conventional alternation of generations

Genotype can have a strong influence on sporogenesis, so it is critical that observations and experiments are conducted on genetically identical or matched samples. One such experiment used clones - two pieces taken from rhizomes of Polypodium vulgare and then cultivated in natural and glasshouse conditions of controlled temperature and light (Siman and Sheffield, 2002). The population of clones raised indoors, with higher temperatures and PAR than that experienced by the outdoor clones, behaved very differently. The plants grown outside produced the usual singe pulse of fertile fronds each season those grown inside generated fertile fronds continuously. Intriguingly, these plants also produced new fronds in distinct pulses approximately every 3 months, rather than incrementally, as if some element of the normal year-long reproductive cycle had been accelerated (Figure 2.7). Although the mechanism at work was not determined, this study showed clearly that the normal year-long process...

North and Central America 271 Notholaena standleyi Adiantaceae

Several species of weedy Chenopodium occur widely in western North America. In an effort to gain a better understanding of some of these taxa, D. J. Crawford and associates undertook an extensive biosystematic examination of the group. The study represents an excellent example of the advantages to be gained by the application of different techniques, including macro- and micromolecular methods, to a complex system. The primary focus of this discussion is C. fremontii S. Watson, which occurs over wide tracts in the southwestern states and shows wide ecological amplitude occupying habitats that range from desert to montane sites. Extensive morphological examination, including greenhouse studies, had established the highly plastic nature of the species. These workers then turned to other methods in order to estimate the level of genetic variation within the taxon. Their first analysis involved an examination of seed protein profiles of more than 210 individual plants representing 33...

General Anatomical Characteristics Of In Vitro Plants

Especially during the acclimatization period (Grout, 1975 Sutter and Langhans, 1982) as it helps the plants from desiccation (Zobayed et al., 2001b), it also reduce the damage to photosynthesis and heat load of leaves by reflecting the light (McClendon, 1984). The degree of wax formation depends on the environmental conditions to which a plant is exposed. Lack of epicuticular wax formation was noticed in the leaves of cauliflower (Figure 7) and Eucalyptus (Figure 8) when grown in well sealed and poorly aerated vessels. On the contrary the plants from well aerated vessels and greenhouse showed intense epicuticular wax development which appeared as white powdery coating under the microscope (Zobayed et al., 2001b). They also noticed the formation of cuticular wax in well aerated and greenhouse grown plants.

Mechanisms Of Resistance Of Douglasfir Trees To The Western Spruce Budworm

The various mechanisms of resistance reported below were evaluated using a combination of laboratory and greenhouse experiments, plus field observations on 40 pairs of mature Douglas-fir trees that are phenotypically resistant versus susceptible to damage from the budworm (Clancy, 2001). Three-generation laboratory diet bioassays (Clancy, 1991b) were used to quantify the budworm's nutritional niche with regard to levels of nitrogen (Clancy, 1992a), sugars (Clancy, 1992b), minerals (Clancy & King, 1993 unpublished data), and monoterpenes (Clancy et al., 1992 Clancy, 1993 unpublished data) that occur in Douglas-fir foliage. The budworm's response curves from the diet bioassays were compared to levels of the nutrients and terpenes in current-year foliage from pairs of Douglas-fir trees that appeared to be resistant versus susceptible to western spruce budworm defoliation. Twelve pairs of trees on the Pike National Forest (NF) in Colorado were sampled in 1988, 1989, and 1990 the trees...

The Impact Of Pathogens On Plant Interference And Allelopathy

Pathogenesis can have both detrimental and beneficial impacts on plant fitness. As such, pathogens are important forces that influence the structure and dynamics in natural and manipulated plant ecosystems. Plant production and numbers within a community are constrained by environmental limitations, which are often mediated through plant interference. Competition for resources and allelopathy (chemical interactions) are the two most important ways that plants interfere with each other. This chapter reviews the effects of pathogens on the competitiveness and allelopathic ability of their hosts. In most cases, pathogens reduce the competitive ability of their host, making the host prone to displacement by neighbouring, resistant plants. However, pathogens may simultaneously increase the allelopathic ability of their hosts, thereby offsetting their loss in competitiveness to varying degrees. Evidence for enhanced allelopathy by infected plants comes in two forms (i) pathogens...

Controlledenvironment Studies With Wheat

Derner et al. (2004) measured intergenerational above- and below-ground responses to elevated CO2 (700 mol mol) of two genotypes of semi-dwarf, hard red, spring wheat (T aestivum L.) grown under greenhouse conditions in a sandy loam soil. Control plants grew at 360 mol mol CO2. The two genotypes were a rust resistant wheat (AZ-MSFRS-82RR) and a hybrid (DK49, Douglas King). These plants were progeny of seeds produced from a previous generation of plants grown at elevated CO2 (700 mol mol). Because neither genotype in the first generation exhibited increased shoot growth with CO2 enrichment (root growth was not measured in the first generation), the objective of Derner et al. (2004) was to assess if exposure to elevated CO2 in subsequent generations resulted in increased above- and below-ground plant growth. They found that root and shoot growth of the two genotypes increased under elevated CO2 to a similar extent in both the second and third generations. In the second generation, CO2...

Soybeans Tepary Bean Bush Bean Barley And Cotton

Salsman et al. (1999) grew in nutrient solution two species of bean Phaseolus acutifolius Gray (common name tepary bean) and P. vulgaris L. (common names kidney bean, string bean, or bush bean) placed under three atmospheric CO2 concentrations of 385 mol mol (ambient), 550 mol mol, or 700 mol mol in a greenhouse. Elevated CO2 increased root and shoot growth of P. actuifo-lius, but not P. vulgaris. Root mass was increased by nearly 60 in P. acutifolius. They noted that same genus had responded differently to CO2 in other studies (Bazzaz 1990), and the reasons for the

Low Nutritive Quality Of Douglasfir Foliage

That were resistant versus susceptible to budworm defoliation at any of the three sites (Clancy, 1991a Clancy et al., 1993 Clancy, 2001). Chen (2001) also failed to find consistent differences in foliar terpenes between resistant and susceptible clones in greenhouse studies. In the 1998 greenhouse bioassay, there were significant differences between the resistant versus susceptible clones. However, the susceptible clones had higher concentrations of monoterpenes in their foliage, which is opposite to what one would expect if terpenes were important in determining Chen (2001) addressed the question of whether induced changes in foliar monoterpenes are likely to be involved in resistance of Douglas-fir to the western spruce budworm in the greenhouse bioassays he conducted with resistant and susceptible clones. Two years of defoliation by budworm larvae had similar effects on monoterpene concentrations of clones from resistant and susceptible trees. This result does not support induction...

Sowing Seeds Directly into Containers

Direct sowing of A. mangiitm should be carried out under a shading net. In Indonesia, nets transmitting 50 light have been extensively used (Supriadi and Valli 1988). Schroeder (1987) notes that only light shade is suitable for A. mangiitm. In general, it is more difficult to supervise tending of direct-sown seedlings in the early stages, partly because outdoor conditions are more extreme. Droplets from the irrigation system must be smaller if using direct sowing. At P.T. lndah Kiat l*ulp and Paper Corporation in Sumatra, about 10-12 million A. mangium seedlings are produced annually by direct sowing in greenhouses (Werren 1991). With proper watering and germination percentage greater than 80 . direct sowing has yielded good nursery results in South Kalimantan (Valli and Rusmana 1990). although it has not yet been implemented on a commercial scale there.

Botany And Phytochemistry

French tarragon is a member of the Compositae (Asteraceae) that grows best in sunny sheltered sites, growing easily on rich, light and well drained soil (Bremners, 1997). Attempts have even been made to grow French tarragon on waste ground with only 10-15 cm layers of soil (Stepanovic et al., 1989). Propagation is by cuttings or division of roots in spring. French tarragon does not set seed, so all propagation is by these techniques (Stickland, 1986). The grey-green leaves are long, smooth and shiny and mostly entire although the lower leaves are 3-toothed at their tips while the unobtrusive yellow globose flowers are clustered in a spike, drooping on downcurved stalks, blooming from June to August. In greenhouse and phytotron studies, French tarragon was grown under various temperature and daylength regimes, with the highest yield of herbage and volatile oil being realised under long daylength and constant temperature. It was found that under these conditions, there was an elevated...

Development Of Transgenic Plants Exploitation Of Hr For Disease Control

An alternative and more general approach that circumvents the limitations caused by the need for a defined genetic background is to induce cell death by expression of so-called killer genes, encoding products that directly interfere with essential cellular functions. Candidates for such products are RNases, DNases, specific proteases, toxins, etc., several of which have been experimentally evaluated (Mittler and Rizhsky, 2000). For example, expression of the barnase gene, encoding an RNase, under the control of a PR gene promoter resulted in transgenic potato plants with enhanced resistance to Phy-tophthora infestans, supporting the hypothesis that HR cell death at infection sites plays an important role in preventing pathogen proliferation (Strittmatter et al., 1995). However, growth under greenhouse or field conditions ultimately led to self-destruction of the plants, indicative of an endogenous activation of the transgene in aging plants, which underscores the need for specific,...

Proteomics Of Model Legume Medicago Truncatula

Proteomics snapshot of organs tissues in G. max. The numbers in the figures correspond to the numbers in the bibliography of this chapter. (Photographs courtesy of Kristy Richerson, Greenhouse Associate, Noble Foundation). FIGURE 12.3. Proteomics snapshot of organs tissues in M. sativa. The numbers in the figures correspond to the numbers in the bibliography of this chapter. (Photographs courtesy of Kristy Richerson, Greenhouse Associate, Noble Foundation). FIGURE 12.3. Proteomics snapshot of organs tissues in M. sativa. The numbers in the figures correspond to the numbers in the bibliography of this chapter. (Photographs courtesy of Kristy Richerson, Greenhouse Associate, Noble Foundation).

Are There Any Differences in AM Fungal Development in Monoxenics Versus Soil

While insisting that AM monoxenic cultures are valid experimental systems to study AM fungal biology, we cannot deny that highly controlled in vitro conditions could somehow affect fungal development. This is in fact the case for all in vitro-cultured micro-organisms, as they develop in nutrient-supplied, homogeneous agar media under optimal environmental conditions. Concerning AM fungi, observations by Pawlowska et al. (1999) and Dalpe (2001) indicate that monoxenically produced spores may be smaller and less pigmented than soil-borne spores (Fortin et al. 2002). We have also observed that a differential response to Melzer's staining usually occurs in soil versus monoxenically raised spores (Fig. 4a, b, e, f). Perhaps related to this, an important reduction in spore wall thickness is noted under monoxenic conditions (Fig. 4c, d, g, h). The latter could be observed at first as a frightening result, since one may think that monoxenically produced spores are weaker than those obtained...

Allometry of Modules

For a study of the developmental and reproductive biology of M'. vimineum, seeds collected from a secondary forest in central New Jersey, USA, were stratified and then germinated to provide seedlings. Plants were grown in a 1 1 mixture of topsoil and fine vermiculite in plastic pots (8 x 8 x 7.4 cm) in a temperature-controlled greenhouse during the summer and fall of 2002. Although details of this study will be reported elsewhere, for the present purpose, detailed dry mass data were obtained on a subsample of 20 plants at the time of normal senescence (October). The primary tiller of each plant was carefully sectioned into its component modules (Fig. 4.5). Reproductive allocation per module was defined as the mass of the CL or CH raceme divided by the mass of the culm plus leaf. Culm and leaf mass collectively represent the module's vegetative mass. The RA of CL and CH for the complete tiller (all modules combined) was also determined.

RNAinduced silencing complex RISC

A detailed analysis revealed that, under standard greenhouse growth conditions, spontaneous co-suppression was triggered at various frequencies (ranging from 5 to 42 ) between individual Class-II lines (Palauqui & Vaucheret, 1995). However, for all lines, triggering consistently occurred during a phenocritical period ranging from 15 days post-germination to flowering. In addition, the incidence of co-suppression between individuals from each line was increased if plants were grown in vitro prior to their transfer in greenhouse. Similar observations were made with co-suppressed lines of tobacco plants expressing a nitrite reductase (Nii) transgene (Palauqui & Vaucheret, 1995). These findings indicate that the physiological state of the plant (i.e. transition from vegetative to reproductive growth) and environmental factors exert a critical influence upon activation of spontaneous systemic silencing. In addition, triggering of Nia and Nii silencing was found to occur exclusively...

What Else Have Monoxenic Cultures to Offer on the Study of AM Fungal Biology

Of sporocarps in G. intraradices has never been described under either greenhouse or natural conditions, we may conclude that (1) the observed structure has a different function than sporocarps, and simply resembles them, or (2) G. intraradices has the potential to form sporocarps, but such a potential is rarely used under the experimental natural conditions studied up to now.

Proteomics Studies In Plant Leaf

Its leaves were treated with cold TCA acetone to extract the proteins followed by 2-DGE separation and CBB-G250 staining 11 . The 2D gel images revealed 400 spots. Out of 43 excised spots, 35 were positively identified as plant proteins, which mainly corresponded to enzymes involved in photosynthesis and energy metabolism. Furthermore, the leaf proteome of Holm oak seedlings grown under greenhouse conditions was partially characterized and compared with that of mature trees in the field 15 . Jorge et al. found that the 2D gel profiles changed according to different tree developmental stages as well as different provenances.

Identifying Effective Strains

Souvannavong and Galiana (1991) collccted, isolated, and characterized Rliizobium strains from A. mangium natural range in Australia, as well as in Cote d'I voire, Senegal, Congo, China, and French Guyana, where it had been introduced. Of the 42 strains isolated, those nodulating A. mangium were all found to belong to the Bradyrhizobium group. In vitro and greenhouse tests, as well as nursery and field trials established in Benin, Cote d' I voire, and the Cook Islands, indicated variable efficiency among the strains, with the Australian strains being the most efficient.

Diversity Link with Soil Factors Geography of Host Plant

The full genetic diversity of Frankia may not yet have been revealed due to limits brought about by the approaches used. Indeed, the time-consuming isolation step not only strongly limits sampling, it also induces biases, under-representing non- or poorly nodulating strains and selecting those isolates that are easily culturable. A previous facilitating but bias-inducing step often seen is the use of an intermediate host inoculated in the laboratory by crushed nodules from the field. Indeed, it was reported that the genetic diversity observed in natural populations can be totally different from that observed following greenhouse inoculations with soil or field nodules (Huguet et al. 2005).

Drosera filiformis

The larger, green form grows in the southern Gulf coastal area, where it is very common. The ranges of the two forms reportedly overlap in South Carolina. In spite of this small area of sym-patry, the two forms have not been found in the same stand, and a natural hybrid is not reported, although hybrids have been produced in the greenhouse.

Under Heterotrophic Or Photomixotrophic Condition

In conventional micropropagation including heterotrophic and photomixotrophic culture methods, the amount of CO2 uptake or net photosynthetic rate of plants in vitro is lower than plants in greenhouse or field controls (Donnelly and Vidaver, 1984). The net photosynthesis rate of birch plants regenerated in vitro was only one-third of those grown in the greenhouse, indicating the lack of full development of photosynthetic competency of plants in vitro (Smith et al., 1986). The low net photosynthetic rate of plants in vitro is attributed to the low RuBPcase activity (Grout, 1988), which was probably due to a high sucrose concentration in leaves of plants in vitro (Hdider and Desjardins, 1994).

Necessity Of Photoautotrophic Micropropagation In Woody Transplant Production

This section shows results on the photoautotrophic growth of woody plants using relatively small vessels like Magenta GA-7 with an air volume of 300-400 ml. For natural ventilation, microporous gas-permeable filters are attached on the hole of the lid or sidewalls of the culture vessel. The natural ventilation rate of the culture vessel is increased by the use of these filter discs. The number of air exchanges (defined as hourly ventilation rate divided by the vessel volume) of a Magenta-type vessel is about 0.15-0.2 h-1. The number of air exchanges of Magenta-type vessels attached by one, two or three microporous gas filter discs (10 mm in diameter each) with a pore-diameter of 0.5 m is about 2, 3, or 4 h-1, respectively (Kozai et al., 1995). Thus, one filter disc attached on the lid of the vessel increases the vessel ventilation rate about 10 times compared to that of the conventional vessel without any filter disc. The method of measuring the number of air exchanges of the culture...

Chlorophyll Content and Chloroplast Ultrastructure

(Farrant et al. 1999, 2008), or a range of possibilities may be envisaged between the two extremes. The HDT Ramonda nathaliae lost 20 of its chlorophyll when desiccated in the greenhouse and 70 in its natural habitat (Drazic et al. 1999). Therefore, the extent of chlorophyll loss is not a species-specific constant, but it may be influenced by environmental factors, particularly irradiance. The activity of chlorophyllase, the key enzyme in chlorophyll catabolism, has its peak at a water content of about 50 in the HDT Ramonda serbica. After further dehydration, this enzyme activity gradually ceases and chlorophyll is retained throughout the desiccated state (Drazic et al. 1999).

Determinants of Allometry

As an example of the utility of this approach, leaf, stem, and root mass of the weedy annual Amaranthus albus were employed to ascertain their inter-relationships and relative contribution to RA under low and high soil nutrients in a greenhouse experiment (Cheplick, 2001). As shown in Fig. 4.12, mass components were intercorrelated, but stem mass was most directly related to RA. In fact, under both nutrient treatments, high leaf and root mass resulted in lower RA, as indicated by negative path coefficients (Fig. 4.12). Because the seeds are continually matured along indeterminate branches in A. albus, increased RA of larger plants was mostly caused by greater number, length, and mass of stems (Cheplick, 2001). It should be worthwhile to decompose vegetative mass via path analysis in other species in future studies of the allometry of RA.

Advances in Ecological Research

Scientists have published hundreds of research articles on the response of plants in greenhouses or special enclosures to increased carbon dioxide (CO2) levels, but there had been no way to test the response of real ecosystems. Scientists at the Brookhaven National Laboratories developed the Free-Air CO2 Enrichment (FACE) system. FACE uses a circle of instruments that pump CO2 into the atmosphere to artificially increase the CO2 levels of a real ecosystem. The increased CO2 increased photosynthesis, supporting earlier greenhouse results showing that plants would respond to higher CO2.

Difficult Identifications

By the way, a rare natural hybrid of D. filiformis v. filiformis (typica) and D. intermed ia, which had been described in the New Jersey Pine Barrens, was recently rediscovered. Its appearance is intermediate between those of the two parents, and plants studied thus far in the greenhouse appear to be sterile. The hybrid is sometimes known as D. x hybrida. D. rotundifolia x D. anglica (D. x obovata) is not infrequently found in northern bogs where the two species are sympatric. The leaf form is intermediate between those of the two parents and may be difficult to distinguish from that of D. anglica unless the two are compared side by side. Finally, D. rotundifolia x D. intermedia has been reported in New Jersey, the usual rule of intermediacy causing the leaf blades to appear almost round.

Flowering and Pollination and Inheritance of Flowering Induction

The procedure for controlled pollination at CPRO-DLO takes advantage of these phenomena. Bagged umbels produce some seeds when shaken from time to time, and fair amounts of selfed seeds may be produced by bagging several umbels of the same plant together. In the winter of 1993 some 40 plants thus bagged, in the greenhouse, produced several hundreds of seeds per plant without any indication of occurrence of self incompatibility. Keulen (1988) demonstrated that bagged umbels with central flowers removed will not set seed upon shaking, i.e. the last pollen produced has died before the first pistils mature. As a final check on the method, reciprocal crosses between annual plants and Bleija biennial plants were made. Properly prepared female receptive umbels (43 of each parent) were pollinated with pollen shedding umbels of the other parent. Average seed set of individual flowers was 60 , over 2300 seeds were produced. Seeds were sown early July in pots set up in a cold frame. By the end...

Methods of Clonal Propagation and Genetic Modification

A successful method of cloning selected plants using very young umbel frames for explants was developed by Neervoort and co-workers at the Van Hall institute, Leeuwarden (Toxopeus et al. 1996). Umbels with young to very young buds were cut from robust healthy plants in a promising population, and immediately transferred to a cool box. After cutting off the buds, the umbel frames were sterilised and cultured upside down on Gamborg's B5 medium supplemented with NAA and BA. The cultures were maintained for 5-6 weeks until the carvone content of the parent plant's seed had been determined. Clones of superior parent plants were selected for multiplication. Subsequently the cultures were transferred to MS 10 medium for multiplication, and were grown into plantlets. These were eventually transplanted to potting mixture in the greenhouse and grown into full plants, such plants will be referred to as cuttings.

Ecological Importance of Mycorrhizae

The importance of mycorrhizae in ecosystems became particularly apparent in the 1960s when plants grown in greenhouses were transplanted into areas such as slag heaps, landfills, and strip-mined areas in order to reclaim the land. With few exceptions, such plants did not survive in these infertile areas. Not until later was it realized that greenhouse soil is often sterilized to prevent the growth of pathogens, and the sterilization process killed the mycorrhizal fungi as well. Today, such reclamation attempts are much more successful because mycorrhizal fungi are inoculated with the plants when they are transplanted into the reclaimed areas. Similarly, attempts to grow certain species of European pines in the United States were unsuccessful until mycorrhizal fungi from their native soils were added at the time of transplanting.

Description Of Plant

The bright yellow flowers which can be 1.5 in. (4 cm) in diameter are borne in panicles. In its native habitat flowering occurs during April and May. Under greenhouse conditions the plants flower during the summer or fall. The flowers, having 5 sepals and 5 petals, open during the day and close at night. The plants are self-fertile and will produce viable seed without any outside pollinating agent. (Photo 4-16)

Botanical Gardens and Arboreta

In addition to their gardens and outdoor plant collections, botanical gardens and arboreta may include herbaria for the collection and preservation of dried plant specimens, libraries, research laboratories, production and display greenhouses, conservatories for the indoor display of tropical plants, educational classrooms, areas for interpretive exhibits, and public amenities such as a gift shop or restaurant.

Radiation The Urban Structure

The geometry of city streets makes short wave radiation more likely to be absorbed and long wave radiation is exchanged between buildings rather than lost to the sky. The concrete structures and especially paved roads as well as the high density of industrial processes in the urban environment are favorable for pollution and dust release. Long wave radiation is trapped in the polluted urban atmosphere which leads to the urban greenhouse effect. Therefore it is plausible to modify the urban climate through urban design. In this process the urban morphology and the use of green space are the most important factors. Urban trees play a special role since they are able to change the radiation field by putting shade.

Consequences of UVB damage in aquatic ecosystems

Into organic material (Houghton & Woodwell, 1989 Siegenthaler & Sarmiento, 1993). This figure is again similar to that for terrestrial ecosystems. In both cases, most of this is released during the decay of the organic material. This natural carbon cycle is disturbed by the release of about 5 Gt of carbon from fossil fuel burning and another 2 Gt from (mostly tropical) deforestation. However, only 3 of the total of 7 Gt actually accumulate in the atmosphere. The remaining 4 Gt are believed to be removed from the cycle by the biological pump in the oceans organic and inorganic carbon falls out of the upper layers of the water column in the form of oceanic snow which is deposited in the deep sea. Thus, a decrease in the phytoplankton populations will result in an increase in the atmospheric C02 concentration, augmenting the greenhouse effect and the resulting sea level rise (Schneider, 1989).

Timing of Reproduction

To study the effect of plant productivity on the timing of flowering and reproductive output, we grew Xanthium canadense Mill. plants (cocklebur, Fig. 6.2) from seeds at high and low nutrient levels (HN and LN, respectively) in a greenhouse under natural light conditions (Sugiyama and Hirose, 1991). Xanthium is a short-day plant, requiring at least 7.5-11 h of continuous darkness for flowering (Ray and Alexander, 1966). We observed that HN and LN plants flowered at 83 and 85 days after germination when dry mass was 14.3 and 6.2 g, respectively. The optimal time, determined by simulations of the model (above) for HN and LN plants (Fig. 6.3), was found to be 85 and 75 days after germination, respectively. We expected earlier flowering in LN than HN plants, but found only a small difference in flowering time between LN and HN, indicating that their flowering is strongly controlled by the photoperiod. A small delay in flowering in LN may be attributed to size-dependence in the response to...

Cyanobacterial Partners

More definitive studies to identify the cyanobacterial symbionts in plant associations have utilized molecular genetic approaches of restriction fragment length polymorphism and sequence analysis of conserved genes and or intergenic regions (Costa et al. 2001 Rasmussen and Svenning 2001 West and Adams 1997). Due to limitations in size of the database and speciation problems in general, these studies do not lead to absolute identities, but do allow for estimates of diversity. The results of such studies indicate considerable diversity in the Nostoc symbionts of bryophytes, both geographically and in a single gametophyte thallus, in cycad coralloid roots from both greenhouse and natural field samples, and naturally grown Gunnera species (Rasmussen and Nilsson 2002).

Effects of Urban Trees on Air Pollutants

Trees emit volatile organic compounds (VOC) that may contribute to air-quality problems. The term VOC includes organic atmospheric trace gases others than CO2 and CO. They are isoprenoids, isoprene and monoterpene, as well as alkanes, alkenes, car-bonyls, alcohols, esters, ethers, and acids. Isoprenoids are the most prominent compounds. Their role is to protect plant membranes against oxidative stress by O3, drought and elevated temperatures. Atmospheric concentrations of biogenic VOCs range between a few parts per billion (ppb) and several parts per trillion (ppt), as they are very reactive, with a chemical lifetime ranging from some minutes to hours. Concentrations reflect several factors, such as anthropogenic and biological sources or sinks, meteorological factors, chemical reactivity and deposition. Isoprenoids are involved in troposphere-chemistry, by directly or indirectly fueling the production of air pollutants and greenhouse gases, such as O3, and increasing acidity as well...

Vetiver Grass For Phytostabilization Of Metalliferous Ecosystems

The most conspicuous characteristics of vetiver grass include its fast growth, large biomass, strong root system, and high level of metal tolerance therefore, it is an important candidate for stabilization of metal-contaminated soils. Results from glasshouse studies show that, when adequately supplied with nitrogen and phosphorus fertilizers, vetiver can grow in soils with very high levels of acidity, aluminum, and manganese. Vetiver growth was not affected and no obvious symptoms were observed when soil pH was as low as 3.3 and the extractable manganese reached 578 mg kg-1, and plant manganese was as high as 890 mg kg-1. Bermuda grass (Cynodon dactylon), which has been recommended as a suitable species for acid mine rehabilitation, has 314 mg kg-1 of manganese in plant tops when growing in mine wastes containing 106 mg kg-1 of manganese 112 . Vetiver also produced excellent growth at a very high level of soil aluminum saturation percentage (68 ), but it did not survive an aluminum...

Field studies of agricultural and horticultural crops

The UV-B-emitting fluorescent tubes used in most growth chamber, greenhouse and field experiments emit some UV-C (200-290 nm) and UV-A (320-400 nm) radiation in addition to the required UV-B (290320 nm). In order to determine the effects on plants of UV-B specifically, radiation from the tubes must be filtered. Celluose diacetate plastic film, which is opaque to wavelengths < 290 nm, is used to prevent UV-C radiation (not present in sunlight at ground level) from reaching experimental plants. Mylar (a Du Pont Co. tradename) is one of several types of polyester film opaque to wavelengths < 320 nm, and is often used in experiments to prevent both UV-C and UV-B from reaching experimental plants. In such experiments, the effect of UV-B radiation on plant response is assumed to be the difference between the UV-B + UV-A treatment (cellulose diacetate filter) and the UV-A treatment (Mylar or equivalent polyester filter). Table 1 summarises recent field experiments with field crops and...

Roles Of Allelopathic Bacteria In Weed Management Strategies

Most of the weeds targeted for biocontrol by AB infest cereal and row crops, but a few are perennial weeds of rangeland and forest ecosystems (Kremer, 2002). Selected AB are intended for soil application, however, some cultures might be effective when applied directly to growing weeds in a postemergence control strategy. Selected AB might also be applied directly to growing weeds as a postemergence control strategy. For example, cultures and cell-free supernatants of AB strains sprayed on common chickweed (Stellaria media), common lambsquarters (Chenopodium album), and field pennycress (Thlaspi arvense) in the greenhouse and field reduced plant biomass and survival (Weissmann and Gerhardson, 2001). Preliminary results suggest AB cultures might be used for selective weed control in growing crops through a one-time foliar application or as a follow-up to soil-incorporation of the same cultures.

Selecting And Screening For Resistance

Field screening alone would not likely provide sufficient detail to select differential resistance mechanisms, unless accompanied by more detailed evaluations. These could be in the field, or in laboratory greenhouse bioassays, meant to differentiate behavioral and developmental resistance factors (by life stage), among productive and field resistant trees. An analogous approach may be feasible with disease pests, by searching for specific aspects of their disease symptomology and or response morphology which reveal differential resistance mechanisms among families or clones. The relative efficiency of field screening followed by in-vitro screening, or vice versa, has not been investigated, nor has the probability that one or the other is more likely to accurately differentiate among resistance mechanisms.

Of phytosiderophores and iron in xylem sap of irondeficient barley

In the experiment conducted in the greenhouse, 6 bunches (18 plants) of barley plants were decapitated at 3 hour intervals and xylem sap was collected for 3 hours similarly to the experiment described in section 4.3. The amount of PS and Fe was calculated based on the concentration and amount of the xylem sap.

Sap Sucking on Leaves and Shoots

Leaf and stem deformations and growth abnormalities result from sucking by various types of bugs (Heteroptera, for example, Lygus lucorum MEY. D., L. pubescens REUT., Exolygus pratensis L., Plagioganthus chrysanthemi WOLFF., Adelphocoris lineolatus GOEZE, and Calocoris norveg-icus GMEL.). If plants are cultivated in a greenhouse, the white fly, Trialeurodes vaporariorum WESTW., and its oval-shaped larvae, living on the underside of chamomile leaves, cause considerable damage.

Of phytopathogenic bacteria

In the laboratory several selective and general agar media should always be in stock. Tubes and plates with diagnostic media for performing biochemical tests and reagents for the Gram test should be prepared on a regular basis. Tobacco, bean, tomato and other plants should always be maintained in the greenhouse for pathogenicity tests.

Experimental methods

The methods used in these experiments were described in Kawai et al. (2001) and Alam et al. (2001a). Barley plants were grown hydroponically in bunches in a greenhouse (Kawai et al., 1988b). Plants were decapitated at about 2 cm above the roots with a stainless steel razor. Xylem sap extruding from the top of the stunts was collected by a capillary tube and kept in a test tube. After collection of the xylem sap, the weight and density of the liquid was measured. The volume of xylem sap was calculated based on weight and density. The xylem sap was stored under -20oC until analysis.

Mother Plant Technique

Such as Sphaerosporella brunnea (A. & S. ex Fr.) Svrcek & Kubicka (Ami-cucci et al. 2000), which are often found on plantlets grown in greenhouses, are difficult to distinguish from the desired fungus using morphological methods. It is even more difficult to distinguish among the mycorrhizas produced by different species of truffles using morphological methods, in particular the white and whitish truffles - T. magnatum, Tuber macula-tum Vittad., Tuber dryophilum Tul. & Tul. and Tuber puberulum Berk. and Broome (Zambonelli et al. 2000). While there are now highly developed molecular identification methods that allow unequivocal identification of the symbiotic fungus (Amicucci et al. 2002), these methods are still very expensive and thus impractical for large-scale quality control of mother plants.

From Lab to the Field

Most studies addressing induced plant defense are laboratory studies, studying simple systems of one plant, one herbivore and its natural enemies. This provides detailed insight into the effects of induced defenses on individual interactions. Through greenhouse and semi-field studies with more complex set-ups, for instance by introducing background odors under controlled conditions (Janssen 1999 Dicke et al. 2003), more insight will be gained in field situations. However, in order to use knowledge gained from these studies, the relative importance of these pieces of information should be assessed in the field. Also biological control in agricultural fields may benefit from such knowledge and understanding of multitrophic interactions in the field.

Srwc Plantation Strategies

To date, few experiments have attempted to evaluate the effect of multiple-clone deployment strategies on pest populations and damage levels. Nordman (1998) evaluated three clonal deployment strategies on larval gypsy moth, Lymantria dispar L. (Lepidoptera Lymantriidae). Two Salix clones were used SV1 (S. dasyclados, not resistant to L. dispar) and SH3 (S. purpurea, resistant to L. dispar). These clones were arranged in three deployment patterns in the greenhouse monoclonal blocks, monoclonal mosaics, or clonal rows. Gypsy moth larvae were released in the center of each pattern and allowed to disperse and feed for 10 days. Significant defoliation differences occurred as a result of the clonal deployment pattern. As expected, the least damage occurred on the monoclonal block of the resistant clone SH3. Clonal rows provided better levels of pest resistance than did monoclonal mosaics or the monoclonal block of the non-resistant clone SV1. Presumably, this occurred because larvae spent...

In Vitro Results to Date

Most of the in vitro mycorrhization techniques applied to edible mushrooms have been developed to obtain mycorrhizal plantlets, which are then planted to produce fruiting bodies. Plantlets colonized with Cantharellus have produced fruiting bodies in the greenhouse (Danell and Camacho 1997). In New Zealand, the first Pinus radiata D. Don plantlets colonized with L. deliciosus mycelia in pure culture produced commercially viable fruiting bodies less than 2 years after planting (Wang et al. 2002). Although plants colonized with porcini and T. matsutake have been obtained, these have yet to lead to commercial production (Hall et al. 2003b).

Review Of Host Plant Resistance In Populus And Srwc Systems

Haugen (1985) evaluated adult C. scripta feeding and oviposition preference on 12 Populus clones. A multiple choice greenhouse experiment confirmed that adult C. scripta did not prefer Populus section clones for oviposition. Pure species clones in the sections Aigeiros and Tacamahaca were both highly preferred for oviposition, and there was a relationship between Aigeiros parentage and oviposition preference. Clones with a greater amount of Aigeiros parentage were more preferred for C. scripta oviposition than those with greater Tacamahaca parentage. There are many implications and applications from this research. Adult C. scripta Populus clonal preference is mediated by a-TQ amounts on the leaf surface however, it is unknown if Populus clones preferred by adult C. scripta for feeding and oviposition are more suitable for larval growth and development. If this proves true, clones less preferred by adult C. scripta could be used in Populus breeding and clonal selection programs. This...

Roots as Sensors and Conduits of Changes in the Water Potential

In part, the lack of success seems to have been due to a lack of knowledge about stress-relevant genes and gene control circuits and also about developmental and metabolic processes. In this respect, it may be that future attempts will be honoured with more success. For example, the over-expression of a transcription factor of the NF-Y family in maize has resulted in lines that show significantly improved drought tolerance when compared to lines that were severely damaged by the stress (Nelson et al. 2007). Similarly, increased hormone biosynthesis, promoted by a drought stress-inducible promoter, in tobacco generated a stay-green phenotype that allowed the plants to recover from a severe drought stress - administered in a greenhouse - significantly better than wild type (Rivero et al. 2007).

Broadsense Heritability

Concerning the heritability of the artemisinin content in Artemisia annua, data reported in the literature are very scarce. In fact, only Ferreira (1994) has proposed an estimate of broad-sense heritability for this trait. In a study carried out with 24 clones of A. annua grown in two environments (in the open and in a glasshouse), the partition of the variance observed in their artemisinin contents revealed a broad-sense heritability of 0.98. Such estimates must be interpreted with caution as they apply only to the plant material used in the study, as well as to the environments, sites and years, in which they have been calculated. Prior to a generalization, several experiments need to be compared.

Human Influences on the Carbon Cycle

And the oceans will become completely saturated with CO2, which would drastically alter their chemical composition. Also, the increased greenhouse effect would cause very substantial but currently unpredictable changes in climate. Because the leak of carbon out of the oceans and atmosphere into the sediments and eventually into the sedimentary rocks is very slow, the added carbon would take thousands of years to dissipate from the oceans and atmosphere. see also Biogeochemical Cycles Decomposers Global Warming Human Impacts Photosynthesis, Carbon Fixation and.

Policies need to recognize the importance of smallscale growers to the future of plantation forestry

Engaging with small-scale growers is also becoming more important for the future of the plantation forestry sector for a range of other reasons - for example, as land ownership fragments (e.g. in the US Brown, 2006), where the majority of land available for plantation establishment is that of small-scale landowners, as is now commonly the case (Mayers and Vermulen, 2002 Kanowski, 2003) or where policy objectives focus on small-scale landowners (e.g. Australia - Australian Greenhouse Office, 2003 Indonesia - Ministry of Forestry, 2005, in World Bank, 2006 South Africa - DWAF, 2006). Small-scale growers are more likely than industrial-scale growers to integrate commercial tree growing with agricultural production, in systems that are often described as 'agroforestry' or 'farm forestry', highlighting the need for a policy environment which supports such integration (e.g. Byron, 2001). Some forms of 'community forestry' may similarly be oriented towards commercial tree growing, and...

Frequently Asked Questions

CO2 concentration in the culture room can be measured and controlled using an infrared CO2 analyzer controller (IRGA) with a solenoid valve, liquid CO2 container and connecting tubes. An IRGA is widely used for CO2 enrichment in the greenhouse and it can be introduced into a tissue culture room. The cost of an infrared CO2 controller is about 1,000 US . IRGA can be used in a forced ventilated vessel for controlling CO2 concentration inside the vessel. The diurnal changes in CO2 concentration can be recorded by an analogue or digital recorder connected to the IRGA. Average CO2 concentration of the outside air is 380-400 mol mol-1 (or ppm). In the CO2 enriched greenhouse, its concentration is usually kept at about 1,000 mol mol-1. In a public place such as a theater and a department store with crowded people, it is often required by environmental regulations to keep CO2 concentration at 5,000 mol mol-1 or lower, because in such places its concentration can exceed 10,000 mol mol-1 easily...

Specificity and Diversity of the Symbiotic Cyanobacteria

Until recently very little was known about the biodiversity and specificity of symbiotic cyanobacteria in cycads. Heterologous Southern hybridisations using cloned genes from the free-living cyanobacterium Anabaena sp. strain PCC 7120 demonstrated a diversity when analysing cyanobacterial DNA prepared from a large number of pooled coralloid roots collected from cycads in their natural habitat in Mexico (Lindblad et al. 1989). In a more detailed study the diversity and host specificity of the cyanobionts of several cycad species (Cycas circinalis L., C. rumphii Miq., Encephalartos lebomboensis I. Verd., E. villosus Lem., and Zamia pumila L.) collected in Fairchild Tropical Garden (Florida, USA) were examined using the tRNALeu(UAA) intron sequence as a genetic marker (Costa et al. 1999). Nested PCR was used to specifically amplify the intron directly from the freshly isolated symbiotic cyanobionts. The intron sequences obtained from the cycad cyanobionts showed high similarities to the...

Nutrient Uptake and Transport by Arbuscular Mycorrhizal Hyphae

Improved total P uptake and growth of mycorrhizal plants compared with corresponding nonmycorrhizal controls is a common observation in greenhouse studies, particularly when plants are grown on a soil with a low nutrient availability. Investigations on the uptake, transport and transfer to the host plant of mineral elements by AM mycelia often employed in vivo or in vitro microcosms where AM colonized plant roots and extraradical mycelium were grown in distinct compartments. Significant depletion of the fungal compartment of a certain nutritional element along with its increased uptake by the associated host plant compared with a corresponding nonmycorrhizal control, indicate symbiotic transfer of this element via the AM mycelium. Several studies have employed radioactive or stable isotopes of nutritional elements in combination with compartmented microcosms. When isotopically labeled nutritional elements supplied exclusively to the AM fungal mycelium can be detected in the associated...

Hardening off of seedlings

Germinated seedlings were transplanted into potting soil in pots and maintained in the greenhouse for 8 weeks, under natural light and 25 C 18 C day night temperature, and watered twice daily. They were then transferred to a shade-house, with 60 light transmittance, watered twice weekly, and fertilized with Multifeed (Plaaskem, South Africa) once every 10 days. After 6 months, by which time the seedlings had attained heights ranging from 300 to 600 mm, they were transplanted to the field.

Technical Challenges To Commercial Production

Propagating M. x giganteus using rhizome divisions entails separating a rhizome mass into small pieces for replanting. This can be done with potted plants growing in greenhouses and can also be conducted using field-grown plants. University of Illinois experience has determined that the potted M. x giganteus can often be divided every 4-8 weeks (Pyter et al., 2009) when grown in greenhouses under 12 h per day artificial light during winter using 10 cm square pots and an artificial, soil-less potting mix.

Carver George Washington

In 1890 Carver began a study of art at Simpson College in Indianola, Iowa. The following year he left Simpson to pursue studies in agriculture at the Iowa State College of Agriculture and Mechanic Arts in Ames. He enrolled in 1891 as the first African-American student at Iowa State. Carver maintained an excellent academic record and was noted for his skill in plant hybridization using techniques of cross-fertilization and grafting. An appointment as assistant botanist allowed him to continue with graduate studies while teaching and conducting greenhouse studies.

Tree growth and physiology

Glasshouse Glasshouse Glasshouse Glasshouse irradiation with UV-B (1 level) cadmium in nutrient solution. Glasshouse irradiation with UV-B (2 levels) and C02 (2 levels). Basiouny and Biggs (1975) reported UV-B effects on peach seedlings grown inside a glasshouse in quartz sand and nutrient solutions with or without sufficient zinc. Zinc-deficient plants grown under UV-B were slightly stunted and had smaller leaves with more distinct zinc-deficiency symptoms than those grown without UV-B. However, Semeniuk (1978) reported no visual symptoms on seedlings of six ornamental tree species in other glasshouse studies. Kossuth and Biggs (1981) used UV-B lamps in a phytotron to expose seedlings of seven tree species to UV-B (Table 2). Biomass production of five species was significantly reduced (5-25 ) at the highest treatment level of 9.56 W mf2 UV-BDNA (biologically effective UV-B weighted with the DNA damage action spectrum of Setlow (1974) and normalised at 300 nm) for 6 h each day. Low...

Starting a Collection

Residential areas near natural growing sites may not have the proper humidity in which to grow carnivorous plants but they share the same temperature, daylight periods and seasonal changes. The humidity can be provided by a greenhouse or terrarium-type structure. The important controlling environmental factors, light, temperature and seasonal changes, are provided by nature and are the parameters to which the carnivorous plants in the area are adapted.

Genetic Diversity And Virulence Development In The Nematode

The highly damaging RKN species M. incognita, M. javanica and M. arenaria reproduce asexually by mitotic reproduction. With this reproductive strategy progeny should be clones of their mother. However, there are differences among isolates in the ability to reproduce on specific hosts. For example, M. incognita strains have been divided into four 'host races' depending on whether or not they can reproduce on cotton or tobacco NC95 (Sasser et al. 1983). In addition some isolates of each of these three species can reproduce on tomato with Mi-1 (Trudgill and Blok, 2001). In some cases, Mi-1-virulent nematodes have been isolated even where tomato has not been previously grown. Resistant strains have also been selected from inbred cultures under greenhouse conditions (Bost and Triantaphyllou, 1987 Eddaoudi et al., 1997 Kaloshian et al., 1996). DNA polymorphism searches between pairs of nearly isogenic strains that are virulent and avirulent on Mi-1 have been carried out in an attempt to...

Collaboration Between Roots and Arbuscular Mycorrhiza Fungal Mycelia in Spatial Exploitation of Soil Nutrient Resources

The net contribution of the AM symbiosis to plant element uptake may be particularly high when a large proportion of nutrients in the growth substrate is available exclusively to the AM mycelium (Janos 2007). Such a situation is often created in experiments employing compartmented planting pots where only AM hyphae have access to a compartment supplied with nutrients. When mycorrhizal plants were grown in presence of a hyphae compartment supplied with easily available mineral N, up to 80 of total N in the plant were taken up via the AM mycelium (George et al. 1992 Frey and Schuepp 1993 Johansen et al. 1994). However, when roots and AM hyphae share the same soil volume, total plant N uptake usually appears to be unaffected by AM root colonization. An increased net uptake of P, Zn and Cu by mycorrhizal compared with nonmycorrhizal plants has, nevertheless, often been observed in greenhouse experiments using non-compartmented pots (e.g. McArthur and Knowles 1993 Liu et al. 2000). Most...

Evolution of Apomixis and Population Genetics in Apomicts

A biologist who is planning a population level study of an apomictic taxon is thus faced with two problems. One must first be able to differentiate between sexual and apomictic individuals which may or may not be morphologically distinct and share similar geographic ranges. Secondly, as wild apomicts are typically facultative, assessing variations in sexual and apomictic seed production within individuals is essential for understanding population dynamics and gene flow. Assuming a difference in ploidy between apomicts and sexuals, time-consuming karyological or cell size-based analyses can be made of each collected individual. Developments in flow cytometry have facilitated analyses of ploidy on the population level and, today, literally 1,000s of individuals can be analyzed in a few days (Sharbel and Mitchell-Olds 2001). Isolating flowers which have been emasculated can be used to identify seed formation through autonomous apomixis (Richards 1997), whereas differentiating between...

Building Your Own Greenhouse

Building Your Own Greenhouse

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