Salinity

Three treatment approaches can be taken (Munns, 2010b, in Prometheus-Wiki). The most common and convenient one is solution culture, which can be supported by solid material such as fine gravel or high-density plastic beads. A recirculating nutrient solution using a modification of the original Hoagland's solution (Munns and James, 2003) is applied using aeration in pots or subirrigation in tanks. A second method is sand culture, when the sand is irrigated with Hoagland's nutrient solution. A...

Plant Growth And Survival During Moderate And Severe Salinity Stress

Excess salinity in the soil solution to which plant roots are exposed can be derived from geochemical sources, sea water infiltration of coastal ground waters, sea water salts in wind and rain, excess fertilizer application to soils or supplementary irrigation with salt-containing irrigation waters (the water evaporates leaving salts to accumulate in the soil). Excessive accumulation of salts in the rhizosphere can lead to growth inhibition, leaf necrosis, accelerated onset of senescence,...

Plant Growth During Moderate Water Stress Episodes

Plant water stress symptoms appear during periods of water deficit when the rate of supply of water from soil to plant falls below the water demands of the combined processes of growth and transpiration. Water deficits can result from drought-induced soil drying, salt-induced osmotic limitations to water uptake, limitations to soil or plant water transport and hot, dry, atmospheric conditions which increase evaporative demands. Drought may take the form of terminal drought that leads...

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Gtg1 gtg2 mutants are hyposensitive to ABA MARIA M. CHAVES ET AL. TABLE II continued ABA and calcium failed to activate anion channels in guard cells of mpk9-1 12-1. Mutation in only 1 of these genes did not show any altered phenotype. ABA-induced stomatal closure and ABA-inhibition of stomatal opening are impaired in quadruple mutant plants. Increased stomatal closure and reduced stomatal density, consequently resulting in enhanced drought and salt tolerance in rice Impaired ABA-induced...