Response of antioxidant system in some marine alga under cadmium stress
2010
El-Shora, H.M | El-Naggar, M.E. | El-Zaghloufy, A.A.
Ulva lactuca and Carolina meditermean were collected from Balteem Coast of Egypt. These two algae represented the most common species in two major divisions Chlorophycophyta and Rhodophycophyta which occur in Balteem coast. Treatment of both algae with CdCl2 at various concentrations (50-250 umol) resulted in an increase in the activities of superoxide dismutase (SOD, EC 1.15.1.1), catalase (CAT, EC 1.11.1.6), ascorbate peroxidase (APX, EC 1.11.1.11) and glutathione reductase (GR, EC 1.6.4.2). The increase in the activities of the four enzymes was proportional with the lower CdCl2 concentrations. However, the higher concentrations (200 and 250 pmol) of CdCl2 resulted in reduction of enzymes activities in both algae. In addition, CdCI2 increased the reduced glutathione (GSH) and decreased the oxidized glutathione (GSSG) contents of both algae. Also, the contents of proline and glycine betaine (GB) as well as lipid peroxidation increased with the lower concentrations of CdC12 and decreased at the higher concentrations However, lipid peroxidation increased continuously with increasing CdCl2 concentrations.
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