RRC ID 20804
Author Ha JH, Hidaka T, Tsuno H.
Title Quantification of toxic Microcystis and evaluation of its dominance ratio in blooms using real-time PCR.
Journal Environ Sci Technol
Abstract Microcystins are produced by cyanobacteria carrying microcystin synthetase (mcy) genes in blooms. The present study investigated seasonal variations in concentrations of mcy A and 16S rRNA genes, encoded in the genus Microcystis using real-time PCR, and measured the water quality variables and microcystin concentrations in a hypereutrophic fish pond between June and November 2007. Prior to field survey, the relationship between axenic Microcystis aeruginosa NIES 102 cell abundance and concentrations of mcy A and 16S rRNA genes was determined by real-time PCR in the laboratory. Based on the quantitative relationship, microcystin-producing and total Microcystis cell numbers in the study site were estimated. The average dominance ratio of microcystin-producing strains in the total Microcystis population was approximately 80% and microcystin concentration was highly associated with toxic Microcystis cell numbers equivalent of mcy A gene. It was also observed that total nitrogen concentration was associated with development of Microcystis blooms, and high concentrations of NOx and NH4 increased microcystin production by promoting growth of microcystin-producing Microcystis strains.
Volume 43(3)
Pages 812-8
Published 2009-2-1
DOI 10.1021/es801265f
PMID 19245020
MeSH Base Sequence DNA Primers Microcystins / analysis Microcystins / toxicity Microcystis / genetics Microcystis / growth & development* Microcystis / metabolism Polymerase Chain Reaction
IF 7.149
Times Cited 62
Algae NIES-102