Temperature shift-induced changes in the antioxidant enzyme system of cyanobacteriumSynechocystis PCC 6803 |
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| Authors: | M. M. El-Sheekh A. A. Rady |
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| Affiliation: | 1. Botany Department, Faculty of Science, Tanta University, Tanta, Egypt
2. Biochemistry Department, Faculty of Vetrinary Medicine, Alexandria University, Alexandria, Egypt
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| Abstract: | The 24 h effect of low (20°C) and high (43°C) temperature on the antioxidant enzyme activities and lipid peroxidation was investigated in intact cells of the cyanobacteriumSynechocystis PCC 6803 grown at 36°C. At low temperature treated cells, the superoxide dismutase, catalase and glutathione peroxidase activities were significantly higher and the protein content lower than in high temperature treated cells. The increase of hydroxyl free radical level and malonyldialdehyde formation, when algal cells were exposed to low temperature, were due to the stimulated production of superoxide radicals O2 − and hydrogen peroxide (H2O2). |
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| Keywords: | catalase glutathione peroxidase lipid peroxidation protein content superoxide dismutase |
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