4.2 Article

Microcystin Biosynthesis and mcyA Expression in Geographically Distinct Microcystis Strains under Different Nitrogen, Phosphorus, and Boron Regimes

Journal

BIOMED RESEARCH INTERNATIONAL
Volume 2016, Issue -, Pages -

Publisher

HINDAWI LTD
DOI: 10.1155/2016/5985987

Keywords

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Funding

  1. DST (Department of Science and Technology), New Delhi [IF 10355]
  2. KRIBB Research Initiative Program
  3. Basic Core Technology Development Program for the Oceans and the Polar Regions of the National Research Foundation (NRF) - Ministry of Science, ICT and Future Planning [2016MIA5A1027453]
  4. UGC (University Grants Commission), New Delhi [P-01/623]
  5. UGC, UPE

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Roles of nutrients and other environmental variables in development of cyanobacterial bloom and its toxicity are complex and not well understood. We have monitored the photoautotrophic growth, total microcystin concentration, and microcystins synthetase gene (mcyA) expression in lab-grown strains of Microcystis NIES 843 (reference strain), KW (Wangsong Reservoir, South Korea), and Durgakund (Varanasi, India) under different nutrient regimes (nitrogen, phosphorus, and boron). Higher level of nitrogen and boron resulted in increased growth (avg. 5 and 6.5Chl alpha mg/L, resp.), total microcystin concentrations (avg. 1.185 and 7.153 mg/L, resp.), and mcyA transcript but its expression was not directly correlated with total microcystin concentrations in the target strains. Interestingly, Durgakund strain had much lower microcystin content and lacked microcystin-YR variant over NIES 843 and KW. It is inferred that microcystin concentration and its variants are strain specific. We have also examined the heterotrophic bacteria associated with cyanobacterial bloom in Durgakund Pond and Wangsong Reservoir which were found to be enriched in Alpha-, Beta-, and Gammaproteobacteria and that could influence the bloom dynamics.

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