Author(s):

J Mohammed Hussain, G Jeevanantham, M Vinoth, P Muruganantham, and A Khaleel Ahamed

Abstract: Growth and biochemical response of varying biomass of marine microalga Synechococcus aeruginosus exposed to ascending concentrations of H₂O₂were investigated. The growth response of Synechococcus aeruginosus to H₂O₂ depended on both H₂O₂ concentrations and biomass concentrations. The effects of _H2O2 on growth responses were apparent in low biomass concentrations and the effects reduced with increase of biomass concentrations. At low concentrations of H₂O₂, the changes in contents of c-phycocyanin, allophycocyanin, c-phycoerythrin, crotenoids, astaxanthin, beta carotene, glutathione, ascorbic acid and polyphenolics, in Synechococcus aeruginosus, were small, while high concentrations of H₂O₂ led to more changes in these biochemicals. These results suggested that the effect of H₂O₂ in Synechococcus aeruginosus depended on both H₂O₂ concentration and biomass.

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