Nonheterocytous cyanobacteria from Brazilian saline-alkaline lakes

Ana Paula Dini Andreote (1) , Marcelo Gomes Marçal Vieira Vaz (1) , Diego Bonaldo Genuário (1) , Laurent Barbiero (2, 1, 3) , Ary Tavares Rezende-Filho (1) , Marli Fátima Fiore (1)

1 USP - Universidade de São Paulo = University of São Paulo
2 IRD [Sénégal] - Institut de recherche pour le développement
3 GET - Géosciences Environnement Toulouse

Saline-alkaline lakes are extreme environments that limit the establishment and development of life. The Nhecolândia, a subregion of the Pantanal wetland in Brazil, is characterized by the existence of ~500 saline-alkaline lakes, which support an underexplored and rich diversity of microorganisms. In this study, unicellular and homocytous cyanobacteria from five saline-alkaline lakes were accessed by culture-dependent approaches. Morphological evaluation and analyses of near complete sequences (~1400 nt) of the 16S rRNA genes were applied for phylogenetic and taxonomic placement. This polyphasic approach allowed for the determination of the taxonomic position of the isolated strains into the following genera: Cyanobacterium, Geminocystis, Phormidium, Leptolyngbya, Limnothrix and Nodosilinea. In addition, fourteen Pseudanabaenales and Oscillatoriales representatives of putative novel taxa were found. These sequences fell into five new clades that could correspond to new generic units of the Pseudanabaenaceae and Phormidiaceae families.

Mots clés: Pseudanabaenales; Oscillatoriales; polyphasic approach; phylogeny; Synechococcales; tropical wetlands; Chroococcales; extreme environment; alkaline environment; saline environment; Brazil

Domaines: Bactériologie; Systématique, phylogénie et taxonomie

Ana Paula Dini Andreote, Marcelo Gomes Marçal Vieira Vaz, Diego Bonaldo Genuário, Laurent Barbiero, Ary Tavares Rezende-Filho, et al.. Nonheterocytous cyanobacteria from Brazilian saline-alkaline lakes. European Journal of Phycology, 2014, 50 (4), pp.675-684. ⟨10.1111/jpy.12192⟩. ⟨hal-02082696⟩