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Abstract

MICROCYSTIS FLOS-AQUAE AS MAJOR CONTRIBUTOR OF MICROCYSTIN-RR CONTENT IN FRESH WATER RESERVOIRS OF VARANASI, NORTH INDIA

Satya Prakash*, V. C. Verma, Minakashi Dwivedi and Abhishek Kumar

ABSTRACT

Summary: The toxic Microcystis flos-aquae strain was isolated from the local freshwater blooms and batch culture characteristics were observed in the modified J-medium. The isolation of toxic species was carried out by serial dilution and solid-agar plate adopting plate transfer method. Among the four culture media evaluated, modified Parker’s J-media was found most suitable for batch culturing of Microcystis flos-aquae strains. The use of Na2S and Na2SO3 in solid and liquid medium was found effective in reducing the contamination in culture and for providing better growth conditions as required for Microcystis flos-aquae specifically. The culture of isolated Microcystis flos-aquae showed the typical batch culture characteristics and the specific growth rate was in range of 0.02-0.40 d-1. The 14 days old batch culture of isolate was used to estimate the toxic components and besides several other variants, the microcystin RR (MC-RR) was dominantly present (0.16% of its dry weight biomass) as confirmed by LC-PDA/MS. Thus it was observed in this study that the strain M. flos-aquae was responsible for the MC-RR contents in the local ponds of northern India.

Keywords: Microcystis flos-aquae, Microcystin, MC-RR, LC- PDA/MS, Cynobacteria, Varanasi ponds, Batch culture.


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