Molecular phylogeny, population genetics, and evolution of heterocystous cyanobacteria using nifH gene sequences

0393277 - BÚ 2014 RIV AT eng J - Journal Article
Singh, P. - Singh, S. S. - Elster, Josef - Mishra, A. K.
Molecular phylogeny, population genetics, and evolution of heterocystous cyanobacteria using nifH gene sequences.
Protoplasma. Roč. 250, č. 3 (2013), s. 751-764. ISSN 0033-183X. E-ISSN 1615-6102
Institutional support: RVO:67985939
Keywords : evolution * heterocystous cyanobacteria * nifH gene
Subject RIV: EH - Ecology, Behaviour
Impact factor: 3.171, year: 2013

In order to assess phylogeny, population genetics, and approximation of future course of cyanobacterial evolution based on nifH gene sequences, 41 heterocystous cyanobacterial strains collected from all over India have been used in the present study. NifH gene sequence analysis data confirm that the heterocystous cyanobacteria are monophyletic while the stigonematales show polyphyletic origin with grave intermixing. Further, analysis of nifH gene sequence data using intricate mathematical extrapolations revealed that the nucleotide diversity and recombination frequency is much greater in Nostocales than the Stigonematales. Similarly, DNA divergence studies showed significant values of divergence with greater gene conversion tracts in the unbranched (Nostocales) than the branched (Stigonematales) strains. Our data strongly support the origin of true branching cyanobacterial strains from the unbranched strains.
Permanent Link: http://hdl.handle.net/11104/0222853