Intra-specific phenotypic and genotypic variation in toxic cyanobacterial Microcystis strains |
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Authors: | Yoshida M Yoshida T Satomi M Takashima Y Hosoda N Hiroishi S |
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Institution: | Department of Marine Bioscience, Fukui Prefectural University, Obama-City, Fukui, Japan;National Research Institute of Fisheries, Food Processing Division, Yokohama, Kanagawa, Japan |
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Abstract: | Aims: We determined if the intra-specific genetic diversity of Microcystis aeruginosa correlates with phenotypic characteristics. Methods and Results: Microcystis aeruginosa isolates from various Japanese waters were characterized using genetic analyses based on the 16S–23S rDNA internal transcribed spacer (ITS) region and DNA-independent RNA polymerase ( rpoC1 ) gene sequences. In addition, morphological and biochemical properties, and the toxicity of M. aeruginosa strains were determined. We found a correlation in phylogenetic clusters of the ITS region and rpoC1 gene sequences. Using a polyphasic approach, genotypic and phenotypic variations in M. aeruginosa showed that the three genetic lineage groups are comprised of a particular phenotype or subgroup of closely related phenotypes. However, some strains had high phenotypic and genotypic diversity compared to the three lineage groups and did not show distinct lineages; therefore, these strains were designated as the 'complex group'. Conclusions: The 'complex group' consisted of genetically and phenotypically incoherent and high diverse populations in M. aeruginosa , although some genotypes or lineages displayed consistent phenotypes. Significance and Impact of the Study: The polyphasic approach combining phenotypic and genetic characterization was effective for comprehending distinct lineages and discriminating the potential complexity of M. aeruginosa populations at the intra-species level. |
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Keywords: | API ZYM diversity microcystin Microcystis phylogeny population taxonomy toxic cyanobacteria |
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