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KMID : 0545120100200111506
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Journal of Microbiology and Biotechnology
2010 Volume.20 No. 11 p.1506 ~ p.1512
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Assessment of Salinity-Induced Antioxidative Defense System of Diazotrophic Cyanobacterium Nostoc muscorum
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Ashish Kumar Srivastava
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Abstract
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The present study examines the salinity-induced oxidative damage and differential response of enzymatic and non-enzymatic antioxidants of Nostoc muscorum. As compared to carotenoid content which showed induction the chlorophyll and phycocyanin contents were inhibited after salt stress. Acceleration of lipid peroxidation and peroxide production suggested onset of oxidative damage. The activities of all studied enzymatic antioxidants were significantly increased by salt stress with maximum induction of superoxide dismutase (154.8% at 200 mM NaCl treatment). Interestingly under severe stress condition (250 mM NaCl) ascorbate peroxidase seems to be more crucial than catalase for peroxide scavenging. Among the studied non-enzymatic antioxidants α-tocopherol was induced maximally (56.0%), however, ascorbate and reduced glutathione were increased by only 8.9% after 250 mM NaCl treatment as compared to control cells. Therefore, salinity was found to induce antioxidative defense system of N. muscorum.
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KEYWORD
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antioxidants, lipid peroxidation, Nostoc muscorum, oxidative damage, reactive oxygen species, salinity
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