Molecular phylogeny and evogenomics of heterocystous cyanobacteria using rbcl gene sequence data

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• 作者：Prashant Singh ; Arshia Fatma ; Arun Kumar Mishra
• 关键词：Heterocystous cyanobacteria ; rbcl gene ; Phylogeny ; Nucleotide diversity ; Gene conversion tracts ; Evolutionary pace
• 刊名：Annals of Microbiology
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：65
• 期：2
• 页码：799-807
• 全文大小：769 KB
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• 作者单位：Prashant Singh (1)
  Arshia Fatma (1)
  Arun Kumar Mishra (1)
  
  1. Laboratory of Microbial Genetics, Department of Botany, Banaras Hindu University, Varanasi, 221005, India
  
• 刊物主题：Microbiology; Microbial Genetics and Genomics; Microbial Ecology; Fungus Genetics; Medical Microbiology; Applied Microbiology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-2044

文摘

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.