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Abstract

We screened out the potential of tolerance of different cyanobacterial species for organic compounds like benzene, toluene , xylene and p-nitrophenol. As PSII is the target of most stress in cyanobacteria, we have tried to improve the sensitivity of whole cells of cyanobacteria, spheroplasts and thylakoidal fragments. This study provides a comparative study of the effects of organic compounds on the growth, bioenergetic studies, nutrient uptake, photosynthesis, antioxidant activities untreated control and organic compound - acclimated filamentous nitrogen fixing cyanobacteria, Anabaena cylindrica. We also performed oxygen evolution properties using Clarke�s type oxy electrode for the comparison of activity in free cell stage. We recorded the changes in their spectral properties, and chlorophyll a concentrations in the presence of organic compounds. We recorded the blue shifting of chlorophyll fluorescence under organic stress. Changes in all the studied parameters, was found and the enhancement of pigments like phycocyanin and carotenoids were found being greater in control than acclimated cells. As compared to control, acclimated Anabaena showed higher changes in their biological activities. The anti oxidant studies revealed the usefulness of these cyanobacteria towards cosmetic industries. This investigation indicative that the cyanobacteria can be used as a biosensor to detect the organic pollutants in water.

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