Temperature shift-induced changes in the antioxidant enzyme system of Cyanobacterium synechocystis PCC 6803
1994
Rady, A.A. | El-Sheekh, M.M. | Matkovics, B.
1. Effect of controlled up- and down-shifts of growth temperature on the antioxidant enzymes activities and lipid peroxidation were investigated in intact cells of Cyanobacterium synechocystis PCC 6803 acclimated at different growth temperature. 2. Algal cells grown at 36 degrees C were treated at 20 and 43 degrees C as down- and upward-shifts of growth temperature for 24 hr, respectively. At the down-shift of growth temperature the superoxide dismutase, catalase and glutathione peroxidase were significantly increased with concomitant decrease in protein content. 3. These parameters showed similar temperature dependencies in the up-shift of growth temperature, they were decreased significantly. 4. The increased hydroxyl (HO) radical and malonyldialdehyde (MDA) formation, when algal cells exposed to down-shift of growth temperature, supposedly due to stimulated production of superoxide radicals (O2-) and hydrogen peroxide (H2O2) at lower temperature.
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