Journal
PROTOPLASMA
Volume 250, Issue 3, Pages 751-764Publisher
SPRINGER WIEN
DOI: 10.1007/s00709-012-0460-0
Keywords
Evolution; Heterocystous cyanobacteria; nifH gene; Nucleotide diversity; Phylogeny; Population genetics
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Funding
- Department of Science and Technology, Ministry of Science and Technology
- CSIR, New Delhi
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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.
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