Taxonomic interpretation of non-heterocystous Cyanobacteria (Oscillatoriales) from eastern India
with particular emphasis on Lyngbya Plectonema complex
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Media type:
E-Article
Title:
Taxonomic interpretation of non-heterocystous Cyanobacteria (Oscillatoriales) from eastern India
with particular emphasis on Lyngbya Plectonema complex
Contributor:
Banerjee, Sreemanti;
Singh, Akanksha;
Pal, Ruma
imprint:
Clinical Biotec, 2024
Published in:Bionatura Journal 1
Language:
Not determined
DOI:
10.21931/bj/2024.01.01.66
ISSN:
1390-9355;
1390-9347
Origination:
Footnote:
Description:
<jats:p>Filamentous non-heterocystous cyanobacterial taxa from 8 genera were collected from different ecological
niches like high altitudes, plains and estuaries of eastern India. The systematic accounts of 23 taxa were investigated with a polyphasic approach considering morpho taxonomy, cultural behavior, and molecular phylogenetic analysis with 16S and 16S-23S Internal Transcribed Spacer (ITS) regions as molecular markers. The
collected taxa were from the families Oscillatoriaceae, Phormidiaceae and Pseudanabaenaceae with 8 representative genera viz. Lyngbya, Plectonema, Oscillatoria, Limnothrix, Leptolyngbya, Planktothrix, Desertifilum and Phormidium. The 16S-23S ITS region-based molecular characterization of 13 species from Oscillatoriaceae, 6 species from Phormidiaceae, and 4 species from Pseudanabaenaceae were found to be congruent
with earlier phylogenetic studies using other markers. Phylogenetic tree analysis revealed habitat-specific
clustering of ITS sequences of the investigated taxa. The 16S molecular marker-based phylogenetic analysis,
along with cultural studies of the Lyngbya-Plectonema clade, highlighted the need for morphotaxonomic reconsideration of Lyngbya birgei and Plectonema tomasinianum related to the formation of false branching.
The present study affirmed that 98% sequence similarity in the ITS region can be considered as a threshold
percentage for conspecificity determination in the Lyngbya genus.
Keywords: Cyanobacteria; ITS; Oscillatoriaceae; Phormidiaceae; Phylogenetic tree; Pseudanabaenaceae</jats:p>