References

Adams DG (2000) Symbiotic interactions. In: Whitton B, Potts M (eds) Ecology of cyanobacteria: their diversity in time and space. Kluwer, Dordrecht, pp 523-561

Adams DG (2002a) Cyanobacteria in symbiosis with hornworts and liverworts. In: Rai AN, Bergman B, Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 117-135

Adams DG (2002b) The liverwort-cyanobacterial symbiosis. Biol Environ Proc R Ir Acad 102B:27-30

Adams DG (2011) Cyanobacterial symbioses. In: Whitton B (ed.) Ecology of cyanobacteria II. Springer, Heidelberg

Adams DG, Duggan PS (1999) Heterocyst and akinete differentiation in cyanobacteria. New Phytol 144:3-33

Adams DG, Duggan PS (2008) Cyanobacteria-bryophyte symbioses. J Exp Bot 59:1047-1058

Adams DG, Bergman B, Nierzwicki-Bauer SA, Rai AN, Schussler A (2006) Cyanobacterial-plant symbioses. In: Dworkin M, Falkow S, Rosenberg E, Schleifer K-H, Stackebrandt E (eds) The prokaryotes. a handbook on the biology of bacteria, vol 1, 3rd edn, Symbiotic associations, biotechnology, applied microbiology. Springer, New York, pp 331-363

Bergman B (2002) The Nostoc-Gunnera symbiosis. In: Rai AN, Bergman B, Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 207-232

Bergman B, Osborne B (2002) The Gunnera-Nostoc symbiosis. Biol Environ Proc R Ir Acad 102B:35-39

Bergman B, Johansson C, Söderback E (1992) The Nostoc-Gunnera symbiosis. New Phytol 122:379-400

Bergman B, Rasmussen U, Rai AN (2007a) Cyanobacterial associations. In: Elmerich C, Newton WE (eds) Associative and endophytic nitrogen-fixing bacteria and cyanobacterial associations. Kluwer, Dordrecht, pp 257-301

Bergman B, Zheng W, Ekman M, Ran L (2007b) The cyanobacterium-Azolla symbiosis: interactions and cell differentiation. Comp Biochem Physiol A Mol Integr Physiol 146A:S218 Bergman B, Ran L, Adams DG (2008) Cyanobacterial-plant symbioses: signaling and development. In: Herrero A, Flores E (eds) The cyanobacteria: molecular biology, genomics and evolution. Caister, Norfolk, pp 447-473 Berry AM, Rasmussen U, Bateman K, Huss-Danell K, Lindwall S, Bergman B (2002) Arabinogalactan proteins are expressed at the symbiotic interface in root nodules of Alnus spp. New Phytol 155:469-479 Bhaya D (2004) Light matters: phototaxis and signal transduction in unicellular cyanobacteria.

Mol Microbiol 53:745-754 Black K, Osborne B (2004) An assessment of photosynthetic downregulation in cyanobacteria from the Gunnera-Nostoc symbiosis. New Phytol 162:125-132 Brenner ED, Stevenson DW, Twigg RW (2003) Cycads: evolutionary innovations and the role of plant-derived neurotoxins. Trends Plant Sci 8:446-452 Burrows LL (2005) Weapons of mass retraction. Mol Microbiol 57:878-888 Campbell EL, Wong FCY, Meeks JC (2003) DNA binding properties of the HrmR protein of Nostoc punctiforme responsible for transcriptional regulation of genes involved in the differentiation of hormogonia. Mol Microbiol 47:573-582 Campbell EL, Summers ML, Christman H, Martin ME, Meeks JC (2007) Global gene expression patterns of Nostoc punctiforme in steady state dinitrogen-grown heterocyst-containing cultures, and at single time points during the differentiation of akinetes and hormogonia. J Bacteriol 189:5247-5256 Campbell EL, Christman H, Meeks JC (2008) DNA microarray comparisons of plant factor- and nitrogen deprivation-induced hormogonia reveal decision-making transcriptional regulation patterns in Nostoc punctiforme. J Bacteriol 190:7382-7391 Carrapico F (2002) The Azolla-Anabaena-bacteria system as a natural microcosm. In: Hoover RB, Levin GV, Paepe RR, Rozanov AY (eds) Instruments, methods, and missions for astrobiology IV, Proceedings of SPIE vol 4495, pp 261-265 Chapman KE, Duggan PS, Billington NA, Adams DG (2008) Mutation at different sites in the Nostoc punctiforme cyaC gene, encoding the multiple-domain enzyme adenylate cyclase, results in different levels of infection of the host plant Blasia pusilla. J Bacteriol 190:1843-1847 Chiu WL, Peters GA, Levieille G, Still PC, Cousins S, Osborne B, Elhai J (2005) Nitrogen deprivation stimulates symbiotic gland development in Gunnera manicata. Plant Physiol 139:224-230

Choudhury A, Kennedy IR (2004) Prospects and potentials for systems of biological nitrogen fixation in sustainable rice production. Biol Fertil Soils 39:219-227 Cohen MF, Yamasaki H (2000) Flavonoid-induced expression of a symbiosis-related gene in the cyanobacterium Nostoc punctiforme. J Bacteriol 182:4644-4646 Cohen MF, Sakihama Y, Takagi YC, Ichiba T, Yamasaki H (2002) Synergistic effect of deoxyanthocyanins from symbiotic fern Azolla spp. on hrmA gene induction in the cyanobac-terium Nostoc punctiforme. Mol Plant Microbe Interact 15:875-882 Costa JL, Lindblad P (2002) Cyanobacteria in symbiosis with cycads. In: Rai AN, Bergman B,

Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 195-205 Costa JL, Paulsrud P, Rikkinen J, Lindblad P (2001) Genetic diversity of Nostoc symbionts endophytically associated with two bryophyte species. Appl Environ Microbiol 67:4393-4396 Costa JL, Romero EM, Lindblad P (2004) Sequence based data supports a single Nostoc strain in individual coralloid roots of cycads. FEMS Microbiol Ecol 49:481-487 DeLuca TH, Zackrisson O, Nilsson MC, Sellstedt A (2002) Quantifying nitrogen-fixation in feather moss carpets of boreal forests. Nature 419:917-920 DeLuca TH, Zackrisson O, Gentili F, Sellstedt A, Nilsson MC (2007) Ecosystem controls on nitrogen fixation in boreal feather moss communities. Oecologia 152:121-130 DeLuca TH, Zackrisson O, Gundale MJ, Nilsson M-C (2008) Ecosystem feedbacks and nitrogen fixation in boreal forests. Science 320:1181

Diaz E-M, Sacristan M, Legaz M-E, Vicente C (2009) Isolation and characterization of a cyanobacterium-binding protein and its cell wall receptor in the lichen Peltigera canina. Plant Signal Behav 4:598-603 Duckett JG, Burch J, Fletcher PW, Matcham HW, Read DJ, Russell AJ, Pressel S (2004) In vitro cultivation of bryophytes: a review of practicalities, problems, progress and promise. J Bryol 26:3-20

Duggan PS, Gottardello P, Adams DG (2007) Molecular analysis of genes in Nostoc punctiforme involved in pilus biogenesis and plant infection. J Bacteriol 189:4547-4551 Ekman M, Tollback P, Klint J, Bergman B (2006) Protein expression profiles in an endosymbiotic cyanobacterium revealed by a proteomic approach. Mol Plant Microbe Interact 19:1251-1261 Elifio SL, Da Silva M, Iacomini M, Gorin PAJ (2000) A lectin from the lichenized Basidiomycete

Dictyonema glabratum. New Phytol 148:327-334 Flores E, Herrero A (2005) Nitrogen assimilation and nitrogen control in cyanobacteria. Biochem Soc Trans 33:164-167

Flores E, Herrero A (2010) Compartmentalised function through cell differentiation in filamentous cyanobacteria. Nat Rev Microbiol 8:39-50 Gantar M (2000a) Mechanical damage of roots provides enhanced colonization of the wheat endorhizosphere by the dinitrogen-fixing cyanobacterium Nostoc sp. strain 2S9B. Biol Fertil Soils 32:250-255

Gantar M (2000b) Co-cultivation of N2-fixing cyanobacterium Nostoc sp strain 2S9B and wheat callus. Symbiosis 29:1-18 Gaspar Y, Johnson KL, McKenna JA, Bacic A, Schultz CJ (2001) The complex structures of arabinogalactan proteins and the journey towards understanding function. Plant Mol Biol 47:161-176

Gehringer MM, Pengelly JJL, Cuddy WS, Fieker C, Forster PI, Neilan BA (2010) Host selection of symbiotic cyanobacteria in 31 species of the Australian cycad genus: Macrozamia (Zamiaceae). Mol Plant Microbe Interact 23:811-822 Gentili F, Nilsson MC, Zackrisson O, DeLuca TH, Sellstedt A (2005) Physiological and molecular diversity of feather moss associative N2-fixing cyanobacteria. J Exp Bot 56:3121-3127 Golden JW, Yoon HS (2003) Heterocyst development in Anabaena. Curr Opin Microbiol 6:557-563

Gorelova OA (2001) Surface ultrastructure of the heteromorphic cells of Nostoc muscorum CALU

304 in a mixed culture with the Rauwolfia callus tissue. Microbiology 70:285-294 Gorelova OA (2006) Communication of cyanobacteria with plant partners during association formation. Microbiology 75:465-469 Gorelova OA, Baulina OI (2009) Ultrastructure of cyanobacterium Nostoc sp f. Blasia cell forms in persisting populations. Microbiology 78:609-617 Gorelova OA, Kleimenov SY (2003) The accumulation and degradation dynamics of cyanophycin in cyanobacterial cells grown in symbiotic associations with plant tissues and cells. Microbiol 72:318-326

Gorelova OA, Korzhenevskaya TG (2002) Formation of giant and ultramicroscopic forms of Nostoc muscorum CALU 304 during cocultivation with Rauwolfia tissues. Microbiol 71:563-569

Guevara R, Armesto JJ, Caru M (2002) Genetic diversity of Nostoc microsymbionts from Gunnera tinctoria revealed by PCR-STRR fingerprinting. Microb Ecol 44:127-136 Gusev MV, Baulina OI, Gorelova OA, Lobakova ES, Korzhenevshaya TG (2002) Artificial cyanobacterium-plant symbioses. In: Rai AN, Bergman B, Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 253-312 Herrero A, Muro-Pastor AM, Valladares A, Flores E (2004) Cellular differentiation and the NtcA

transcription factor in filamentous cyanobacteria. FEMS Microbiol Rev 28:469-487 Houle D, Gauthier SB, Paquet S, Planas D, Warren A (2006) Identification of two genera of N2-fixing cyanobacteria growing on three feather moss species in boreal forests of Quebec, Canada. Can J Bot 84:1025-1029

Karthikeyan N, Prasanna R, Nain L, Kaushik BD (2007) Evaluating the potential of plant growth promoting cyanobacteria as inoculants for wheat. Eur J Soil Biol 43:23-30 Karthikeyan N, Prasanna R, Sood A, Jaiswal P, Nayak S, Kaushik BD (2009) Physiological characterization and electron microscopic investigation of cyanobacteria associated with wheat rhizosphere. Folia Microbiol 54:43-51 Khamar HJ, Breathwaite EK, Prasse CE, Fraley ER, Secor CR, Chibane FL, Elhai J, Chiu W-L (2010) Multiple roles of soluble sugars in the establishment of Gunnera-Nostoc endosymbio-sis. Plant Physiol 154:1381-1389 Klint J, Ran L, Rasmussen U, Bergman B (2006) Identification of developmentally regulated proteins in cyanobacterial hormogonia using a proteomic approach. Symbiosis 41:87-95 Kluge M (2002) A fungus eats a cyanobacterium: the story of the Geosiphon pyriformis endocyanosis. Biol Environ Proc R Ir Acad 102B:11-14 Kluge M, Mollenhauer D, Wolf E, Shussler A (2002) The Nostoc-Geosiphon endocytobiosis. In: Rai AN, Bergman B, Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 19-30

Knight CD, Adams DG (1996) A method for studying chemotaxis in nitrogen fixing cyanobacte-

rium-plant symbioses. Physiol Mol Plant Pathol 49:73-77 Lechno-Yossef S, Nierzwicki-Bauer SA (2002) Azolla-Anabaena symbiosis. In: Rai AN, Bergman B,

Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 153-178 Legaz M-E, Fontaniella B, Millanes A-M, Vicente C (2004) Secreted arginases from phylogen-etically far-related species act as cross-recognition factors for two different algal cells. Eur J Cell Biol 83:435-446

Lehr H, Galun M, Ott S, Jahns HM, Fleminger G (2000) Cephalodia of the lichen Peltigera aphthosa (L.) Willd. Specific recognition of the compatible photobiont. Symbiosis 29:357-365 Liaimer A, Bergman B (2004) Phytohormones in cyanobacteria: occurrence and perspectives. In: Tikhonovich I, Lugtenberg B, Provorov N (eds) Biology of plant-microbe interactions. International Society for Molecular Plant Microbe Interactions, St Paul, MN, pp 394-397 Liaimer A, Matveyev A, Bergman B (2001) Isolation of host plant induced cDNAs from Nostoc sp strain PCC 9229 forming symbiosis with the angiosperm Gunnera spp. Symbiosis 31:293-307 Lindblad P (2009) Cyanobacteria in symbiosis with cycads. Microbiol Monogr 8:225-233 Lindblad P, Costa J-L (2002) The cyanobacterial-cycad symbiosis. Biol Environ Proc R Ir Acad 102B:31-33

Lindlbad P, Bergman B, Hofsten AV, Hallblom L, Nylund JE (1985) The cyanobacterium-Zamia symbiosis: an ultrastructural study. New Phytol 101:707-716 Lobakova ES, Dol'nikova GA, Korzhenevshaya TG (2001a) Cyanobacterial-bacterial complexes in plant syncyanoses. Microbiology 70:111-116 Lobakova ES, Shchelmanova AG, Korzhenevskaya TG, Gusev MV (2001b) Infection of plants and plant tissue cultures with cyanobacteria-bacteria complexes. Microbiology 70:299-305 Lobakova ES, Orazova MK, Dobrovol'skaya TG (2003) Microbial complexes occurring on the apogeotropic roots and in the rhizosphere of cycad plants. Microbiology 72:628-633 Mattick JS (2002) Type IV pili and twitching motility. Annu Rev Microbiol 56:289-314 Meeks JC (2003) Symbiotic interactions between Nostoc punctiforme, a multicellular cyanobac-

terium, and the hornwort Anthoceros punctatus. Symbiosis 35:55-71 Meeks JC (2006) Molecular mechanisms in the nitrogen-fixing Nostoc-bryophyte symbiosis. Prog

Molec Subcell Biol 41:165-196 Meeks JC (2009) Physiological adaptations in nitrogen-fixing Nostoc-plant symbiotic associations. In: Pawlowski K (ed) Prokaryotic symbionts in plants, vol 8, Microbiol monographs. Springer, Berlin, pp 181-205 Meeks JC, Elhai J (2002) Regulation of cellular differentiation in filamentous cyanobacteria in free-living and plant-associated symbiotic growth states. Microbiol Mol Biol Rev 66:94-121 Meeks JC, Elhai J, Thiel T, Potts M, Larimer F, Lamerdin J, Predki P, Atlas R (2001) An overview of the genome of Nostoc punctiforme, a multicellular, symbiotic cyanobacterium. Photosynth Res 70:85-106

Meeks JC, Campbell EL, Summers ML, Wong FC (2002) Cellular differentiation in the cyano-

bacterium Nostoc punctiforme. Arch Microbiol 178:395-403 Muro-Pastor MI, Reyes JC, Florencio FJ (2001) Cyanobacteria perceive nitrogen status by sensing intracellular 2-oxoglutarate levels. J Biol Chem 276:38320-38328 Muro-Pastor AM, Reyes JC, Florencio FJ (2005) Ammonium assimilation in cyanobacteria.

Photosynth Res 83:135-150 Nilsson MC, Wardle DA (2005) Understory vegetation as a forest ecosystem driver: evidence from the northern Swedish boreal forest. Eur J Phycol 3:421-428 Nilsson M, Bergman B, Rasmussen U (2000) Cyanobacterial diversity in geographically related and distant host plants of the genus Gunnera. Arch Microbiol 173:97-102 Nilsson M, Bhattacharya J, Rai AN, Bergman B (2002) Colonization of roots of rice (Oryza sativa)

by symbiotic Nostoc strains. New Phytol 156:517-525 Nilsson M, Rasmussen U, Bergman B (2005) Competition among symbiotic cyanobacterial Nostoc strains forming artificial associations with rice (Oryza sativa). FEMS Microbiol Lett 245:139-144

Nilsson M, Rasmussen U, Bergman B (2006) Cyanobacterial chemotaxis to extracts of host and nonhost plants. FEMS Microbiol Ecol 55:382-390 Nudleman E, Kaiser D (2004) Pulling together with type IV pili. J Mol Microbiol Biotechnol 7:52-62

Osborne B, Sprent JI (2002) Ecology of the Nostoc-Gunnera symbiosis. In: Rai AN, Bergman B,

Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 233-251 Pabby A, Prasanna BM, Nayak S, Singh AK (2003) Physiological characterization of the cultured and freshly isolated endosymbionts from different species of Azolla. Mar Biotechnol 41:73-79 Pabby A, Prasanna BM, Singh AK (2004a) Biological significance of Azolla and its utilization in agriculture. Proc Indian Natl Sci Acad B 3:299-333 Pabby A, Prasanna R, Singh PK (2004b) Morphological characterization of cultured and freshly separated cyanobionts (Nostocales, Cyanophyta) from Azolla species. Acta Bot Hung 46:211-223 Papaefthimiou D, Hrouzek P, Mugnai MA, Lukesova A, Turicchia S, Rasmussen U, Ventura S (2008a) Differential patterns of evolution and distribution of the symbiotic behaviour in nostocacean cyanobacteria. Int J Syst Evol Microbiol 58:553-564 Papaefthimiou D, Van Hove C, Lejeune A, Rasmussen U, Wilmotte A (2008b) Diversity and host specificity of Azolla cyanobionts. J Phycol 44:60-70 Paulsrud P, Lindblad P (2002) Fasciclin domain proteins are present in Nostoc symbionts of lichens. Appl Environ Microbiol 68:2036-2039 Rai AN, Soderback E, Bergman B (2000) Cyanobacterium-plant symbioses. New Phytol 147:449-481

Ran LA, Larsson J, Vigil-Stenman T, Nylander JAA, Ininbergs K, Zheng WW, Lapidus A, Lowry S, Haselkorn R, Bergman B (2010) Genome erosion in a nitrogen-fixing vertically transmitted endosymbiotic multicellular cyanobacterium. PLoS One 5:e11486 Rasmussen U, Nilsson M (2002) Cyanobacterial diversity and specificity in plant symbioses. In: Rai AN, Bergman B, Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 313-328

Rasmussen U, Svenning MM (2001) Characterization by genotypic methods of symbiotic Nostoc strains isolated from five species of Gunnera. Arch Microbiol 176:204-210 Rasmussen U, Johansson C, Renglin A, Petersson C, Bergman B (1996) A molecular characterization of the Gunnera-Nostoc symbiosis: comparison with Rhizobium- and Agrobacterium-plant interactions. New Phytol 133:391-398 Renzaglia KS, Duff RJ, Nickrent DL, Garbary D (2000) Vegetative and reproductive innovations of early land plants: implications for a unified phylogeny. Philos Trans R Soc Lond B Biol Sci 355:769-793

Renzaglia KS, Schuette S, Duff RJ, Ligrone R, Shaw AJ, Mishler BD, Duckett JG (2007) Bryophyte phylogeny: advancing the molecular and morphological frontiers. Bryologist 110:179-213

Rikkinen J (2002) Cyanolichens: an evolutionary overview. In: Rai AN, Bergman B, Rasmussen U

(eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 31-72 Rikkinen J, Virtanen V (2008) Genetic diversity in cyanobacterial symbionts of thalloid bryophytes. J Exp Bot 59:1013-1021 Sacristan M, Millanes A-M, Legaz M-E, Vicente C (2006) A lichen lectin specifically binds to the alpha-1,4-polygalactoside moiety of urease located in the cell wall of homologous algae. Plant Signal Behav 1:23-27

Seifert GJ, Roberts K (2007) The biology of arabinogalactan proteins. Annu Rev Plant Biol 58:137-161

Sergeeva E, Liaimer A, Bergman B (2002) Evidence for production of the phytohormone indole-3-

acetic acid by cyanobacteria. Planta 215:229-238 Showalter AM (2001) Arabinogalactan proteins: structure, expression and function. Cell Mol Life Sci 58:1399-1417

Solheim B, Zielke M (2002) Associations between cyanobacteria and mosses. In: Rai AN, Bergman B, Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 137-152 Solheim B, Wiggen H, Roberg S, Spaink HP (2004) Associations between arctic cyanobacteria and mosses. Symbiosis 37:169-187 Sood A, Prasanna R, Prasanna BM, Singh PK (2008a) Genetic diversity among and within cultured cyanobionts of diverse species of Azolla. Folia Microbiol 53:35-43 Sood A, Prasanna R, Singh PK (2008b) Fingerprinting of freshly separated and cultured cyanobionts from different Azolla species using morphological and molecular markers. AquatBot 88:142-147

Svenning MM, Eriksson T, Rasmussen U (2005) Phylogeny of symbiotic cyanobacteria within the genus Nostoc based on 16S rDNA sequence analyses. Arch Microbiol 183:19-26 Thajuddin N, Muralitharan G, Sundaramoorthy M, Ramamoorthy R, Ramachandran S, Akbarsha MA, Gunasekaran M (2010) Morphological and genetic diversity of symbiotic cyanobacteria from cycads. J Basic Microbiol 50:254-265 Uheda E, Silvester WB (2001) The role of papillae during the infection process in the Gunnera-

Nostoc symbiosis. Plant Cell Physiol 42:780-783 Ungerer JL, Pratte BS, Thiel T (2008) Regulation of fructose transport and its effect on fructose toxicity in Anabaena spp. J Bacteriol 190:8115-8125 Usher KM (2008) The ecology and phylogeny of cyanobacterial symbionts in sponges. Mar Ecol

Evol Perspect 29:178-192 Vaishampayan A, Sinha RP, Hader D-P, Dey T, Gupta AK, Bhan U, Rao AL (2001)

Cyanobacterial biofertilizers in rice agriculture. Bot Rev 67:453-516 van Hove C, Lejeune A (2002a) The Azolla-Anabaena symbiosis. Biol Environ Proc R Ir Acad 102B:23-26

van Hove C, Lejeune A (2002b) Applied aspects of Azolla-Anabaena symbiosis. In: Rai AN, Bergman B, Rasmussen U (eds) Cyanobacteria in symbiosis. Kluwer, Dordrecht, pp 179-193 Vazquez-Bermudez MF, Herrero A, Flores E (2002) 2-oxoglutarate increases the binding affinity of the NtcA (nitrogen control) transcription factor for the Synechococcus glnA promoter. FEBS Lett 512:71-74

Vessey JK, Pawlowski K, Bergman B (2005) Root-based N2-fixing symbioses: legumes, actinorhizal plants, Parasponia sp. and cycads. Plant Soil 274:51-78 Villarreal JC, Renzaglia KS (2006) Structure and development of Nostoc strands in Leiosporoceros dussii (Anthocerotophyta): a novel symbiosis in land plants. Am J Bot 93: 693-705

Vivas M, Sacristan M, Legaz M-E, Vicente C (2010) The cell recognition model in chlorolichens involving a fungal lectin binding to an algal ligand can be extended to cyanolichens. Plant Biol 12:615-621

Wang CM, Ekman M, Bergman B (2004) Expression of cyanobacterial genes involved in heterocyst differentiation and dinitrogen fixation along a plant symbiosis development profile. Mol Plant Microbe Interact 17:436-443

Watts SD (2000) Signalling in the Nostoc-plant symbiosis. PhD thesis, University of Leeds, UK, pp 185

West NJ, Adams DG (1997) Phenotypic and genotypic comparison of symbiotic and free-living cyanobacteria from a single field site. Appl Environ Microbiol 63:4479-4484 Wong FCY, Meeks JC (2001) The hetF gene product is essential to heterocyst differentiation and affects HetR function in the cyanobacterium Nostoc punctiforme. J Bacteriol 183:2654-2661 Wong FCY, Meeks JC (2002) Establishment of a functional symbiosis between the cyanobacte-rium Nostoc punctiforme and the bryophyte Anthoceros punctatus requires genes involved in nitrogen control and initiation of heterocyst differentiation. Microbiology 148:315-323 Wouters J, Janson S, Bergman B (2000) The effect of exogenous carbohydrates on nitrogen fixation and hetR expression in Nostoc PCC 9229 forming symbiosis with Gunnera. Symbiosis 28:63-76

Zhang C-C, Laurent S, Sakr S, Peng L, Bedu S (2006) Heterocyst differentiation and pattern formation in cyanobacteria: a chorus of signals. Mol Microbiol 59:367-375 Zheng WW, Song TY, Bao XD, Bergman B, Rasmussen U (2002) High cyanobacterial diversity in coralloid roots of cycads revealed by PCR fingerprinting. FEMS Microbiol Ecol 40:215-222 Zheng WW, Ran L, Bergman B (2009a) Structural characteristics of the cyanobacterium-Azolla symbiosis. In: Pawlowski K (ed) Prokaryotic symbionts in plants, vol 8, Microbiol monographs. Springer, Heidelberg, pp 235-263 Zheng WW, Bergman B, Chen B, Zheng SP, Xiang G, Rasmussen U (2009b) Cellular responses in the cyanobacterial symbiont during its vertical transfer between plant generations in the Azolla microphylla symbiosis. New Phytol 181:53-61 Zielke M, Ekker AS, Olsen RA, Spjelkavik S, Solheim B (2002) The influence of abiotic factors on biological nitrogen fixation in different types of vegetation in the High Arctic, Svalbard. Arct Antarct Alpine Res 34:293-299 Zielke M, Solheim B, Spjelkavik S, Olsen RA (2005) Nitrogen fixation in the high arctic: role of vegetation and environmental conditions. Arct Antarct Alpine Res 37:372-378

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