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Name derivation:



Pseudanabaena  Lauterborn  1915;  38 of 53 species are currently accepted taxonomically (Guiry and Guiry 2013).

Order Pseudanabaenales

Family Pseudanabaenaceae



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).


Similar genera:

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.


Horizontal gene transfer (HGT):

Transconjugation between Pseudanabaena sp., Synechococcus sp. and Synechocystis sp. has been demonstrated (Sode et al. 1992).



Vary from planktonic to benthic or meroplanktonic.  Some species are extremophiles in hot or hypersaline locations.




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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