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Home / Cyanobacteria / Filaments / Unbranched / Untapered / No_heterocysts / No_visible_sheath / Pseudanabaena |
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Name derivation: |
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Classification: |
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Pseudanabaena Lauterborn 1915; 38 of 53 species are currently accepted taxonomically (Guiry and Guiry 2013). Order PseudanabaenalesFamily Pseudanabaenaceae
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Morphology: |
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Filaments solitary or clustered into mucilaginous mats. Cells cylindrical, incut slightly at crosswalls. End cells rounded or cone shaped. Gas vesicles are ~65 nm wide and 3mainly 300-500 nm long with some outliers up to 2 µm. Synthesis includes, among other genes, a single photo-regulated gas vesicle protein gene (gvpA), and the gvpA mRNA is inversely correlated with photosynthetically active radiation (PAR) in Pseudanabaena sp. PCC 6901. Apparently the gas vesicles contain only a single protein (Damerval et al. 1991).
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Similar genera: |
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Some Anabaena species have similar cylindrical cells, but also are capable of producing akinetes and heterocysts. In the absence of specialized cells these species are similar morphologically.
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Horizontal gene transfer (HGT): |
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Transconjugation between Pseudanabaena sp., Synechococcus sp. and Synechocystis sp. has been demonstrated (Sode et al. 1992).
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Habitat: |
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Vary from planktonic to benthic or meroplanktonic. Some species are extremophiles in hot or hypersaline locations.
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References: |
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Damerval, T., A.-M. Castets, J. Houmard and N.T. de Marsac 1991. Gas vesicle synthesis in the cyanobacterium Pseudanabaena sp.: occurrence of a single photoregulated gene. Molecular Microbiology 5(3):657-664. Guiry, M.D. and G.M. Guiry 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 04 September 2013. Lauterborn, R. 1915. Die sapropelische Lebewelt. Ein Beitrag zur Biologie des Faulschlammes natürlicher Gewässer. Verhandlungen des Naturhistorisch-Medizinischen Vereins zu Heidelberg ser. 2 13: 395-481, pl. III. Sode, K., M. Tatara, H. Takeyama, J.G. Burgess and T. Matsunaga 1992. Conjugative gene transfer in marine cyanobacteria: Synechococcus sp., Synechocystis sp. and Pseudanabaena sp. Applied Microbiological Biotechnology 47:369-373. |
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Home / Cyanobacteria / Filaments / Unbranched / Untapered / No_heterocysts / No_visible_sheath / Pseudanabaena |
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