Abstract
Taxonomic affiliations and molecular diversity of 41 heterocystous cyanobacteria representing 12 genera have been assessed on an evolutionary landscape using rbcl gene sequence data-based phylogenomics and evogenomics approaches. Phylogenetic affiliations have clearly demonstrated the polyphyly of the true branching cyanobacteria, along with a frequent intermixing amongst the heterocystous cyanobacteria. The monophyletic origin of the heterocystous cyanobacteria was also quite evident from maximum parsimony and neighbor joining analyses. Incongruency with the traditional scheme of cyanobacterial taxonomy was frequently observed, thus advocating towards some re-amendments in the cyanobacterial classificatory schemes. Evogenomics analyses of gene sequence data gave a clear indication about the greater evolutionary pace of the unbranched cyanobacteria as compared to the branched forms. It was evident that the order Nostocales would be controlling the future pace of evolution of heterocystous cyanobacteria. The cyanobacteria Nostoc was found to have the greatest genetic heterogeneity amongst the studied genera, along with some evidence towards events of lateral gene transfer amongst the heterocystous cyanobacteria in case of the rbcl gene. Thus, heterocystous cyanobacteria were found to be a fast evolving group, with estimates of gene conversion tracts pointing towards the unbranched heterocystous cyanobacteria being at the base of evolutionary diversifications of the complete heterocystous lineage.
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We are thankful to the Council of Scientific and Industrial Research, New Delhi for providing financial support. The Head of the Department of Botany, Banaras Hindu University, Varanasi, India is gratefully acknowledged for providing laboratory facilities.
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Singh, P., Fatma, A. & Mishra, A.K. Molecular phylogeny and evogenomics of heterocystous cyanobacteria using rbcl gene sequence data. Ann Microbiol 65, 799–807 (2015). https://doi.org/10.1007/s13213-014-0920-1
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DOI: https://doi.org/10.1007/s13213-014-0920-1