1887

Abstract

The genus Anagnostidis & Komárek (1988) was described from a set of strains identified as ‘LPP-group B’. The morphology within this group is not particularly informative and underestimates the group’s genetic diversity. In the present study, two new pseudanabaenacean genera related to morphotypes, gen. nov. and gen. nov., are described under the provisions of the International Code of Nomenclature for Algae, Fungi and Plants, based on a polyphasic approach. gen. nov. (type species sp. nov.) has sheaths and trichomes with slight gliding motility, which distinguish this genus from gen. nov. (type species sp. nov.), which possesses trichomes arranged in an ornate (interwoven) pattern. 16S rRNA gene sequences of strains of and exhibited low identity to each other (≤91.6 %) and to other sequences from known pseudanabaenacean genera (≤94.3 and 93.7 %, respectively). In a phylogenetic reconstruction, six sequences from strains of and four from strains of formed two separate and robust clades (99 % bootstrap value), with the genera and , respectively, as the closest related groups. 16S–23S rRNA intergenic spacer sequences and secondary structures of strains of and did not correspond to any previous descriptions. The strains of and were able to survive and produce biomass at a range of pH (pH 4–11) and were also able to alter the culture medium to pH values ranging from pH 8.4 to 9.9. These data indicate that cyanobacterial communities in underexplored environments, such as the Pantanal wetlands, are promising sources of novel taxa.

Funding
This study was supported by the:
  • São Paulo State Research Foundation (Award INSU-Ec2co and FAPESP 2013/09192-0)
  • National Council for Scientific and Technological Development (Award CNPq 478193/2013-0)
  • National Institute of Sciences of the Universe
  • FAPESP (Award 2010/51666-0, 2009/15402-1, 2010/00321-3 and 2010/18732-0)
  • CAPES (Coordination of Improvement of Higher Education Personnel)
  • French Consulate in São Paulo
  • CNPq (Award 306607/2012-3)
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2015-01-01
2024-03-28
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