Abstract
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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Acknowledgments
We are thankful to the Department of Science and Technology, Ministry of Science and Technology, for providing financial support in the form of a project. One of us (PS) is also thankful to CSIR, New Delhi, for their financial support in the form of SRF. The Head, Department of Botany, Banaras Hindu University, Varanasi, India, is gratefully acknowledged for providing laboratory facilities.
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Singh, P., Singh, S.S., Elster, J. et al. Molecular phylogeny, population genetics, and evolution of heterocystous cyanobacteria using nifH gene sequences. Protoplasma 250, 751–764 (2013). https://doi.org/10.1007/s00709-012-0460-0
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DOI: https://doi.org/10.1007/s00709-012-0460-0