Quantification and genetic diversity of total and microcystin-producing Microcystis during blooming season in Tai and Yang-cheng lakes, China.

Abstract:

AIMS:The aims of present study were to evaluate the abundances, genetic diversity of total and microcystin-producing Microcystis over temporal and spatial scales, and to investigate relationships among Microcystis and water parameters in Tai and Yang-cheng lakes. METHODS AND RESULTS:Abundances of total and microcystin-producing Microcystis varied across sampling periods and locations, which were assessed using qPCR with primers specific to Microcystis 16S rDNA and mcyA genes. The 16S rDNA from two lakes were relatively diverse. However, mcyA genes were rather conservative and were >97% identical to reference sequences. The highly positive correlations between mcyA and microcystin presence (r = 0·671 in Tai; r = 0·799 in Yang-cheng) suggested that mcyA can be used as a good biomarker for microcystin productions. CONCLUSION:The results demonstrated that Microcystis were genetically diverse between these conjunctive lakes; however, mcyA genes were relatively conservative in two lakes. Quantifying mcyA by qPCR was an efficient tool for monitoring toxic Microcystis. SIGNIFICANCE AND IMPACT OF THE STUDY:This study has improved our understanding of observable differences within and between each lake on spatial and temporal scales. And the discovery of new mcyA sequences in natural water enriched the understanding of phylogenetic diversity of Microcystis and toxin-production-related mcy gene.

journal_name

J Appl Microbiol

authors

Li D,Gu AZ,He M

doi

10.1111/jam.12456

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

1482-94

issue

6

eissn

1364-5072

issn

1365-2672

journal_volume

116

pub_type

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