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Title 

Dynamics of microcystin production and quantification of potentially toxigenic Microcystis sp. using real-time PCR

Authors 

A SrivastavaGang Guk ChoiChi-Yong AhnHee-Mock OhA K RaviR K Asthana

Publisher 

Elsevier

Issue Date 

2012

Citation 

Water Research, vol. 46, no. 3, pp. 817-827

Keywords 

LC-MSMicrocystinMicrocystis sp.Real-time PCR

Abstract 

Cyanobacterial blooms in eutrophied water body are generally composed of various genotypes with or without microcystin-producing genes (mcy gene cluster). Thus there is a need for quantification of potent toxin producing strains. The present study aimed at identifying microcystin variants and its producer strains in Durgakund pond, Varanasi, India, based on quantification of cpcBA-IGS and mcyA (condensation domain) genes using real-time PCR and LC-MS. Increase in microcystin concentrations was correlated with increase in mcyA copy number and the level of pigments (chlorophyll a, phycocyanin and carotenoids). Also, selected environmental factors (water temperature, light irradiance, rainfall, pH, N and P) and the concentration of microcystin variants (MC-LR, -RR and -YR) were also assessed in samples during May 2010 to April 2011 to establish the possible correlation among these parameters. Nutrients favored cyanobacterial bloom but it could not be correlated with the levels of microcystin variants and seemed to be geographically specific. Microcystis sp. dominant in the pond comprised potentially toxigenic cells. The ratio of potentially toxigenic Microcystis sp. to that of total Microcystis sp. ranged from 0% to 14%. Such studies paved the way to identify and quantify the most potent microcystin producer in the tropical aquatic body.

ISSN 

0043-1354

Link 

http://dx.doi.org/10.1016/j.watres.2011.11.056

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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