Pak. J. Bot., 48(6): 2223-2231, 2016. | Back to Contents | ||||
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Updated: 22-12-16 | ||||
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SELENIUM AMELIORATES CADMIUM STRESS-INDUCED DAMAGE BY IMPROVING ANTIOXIDANT DEFENSE SYSTEM IN CHLAMYDOMONAS REINHARDTII
ABD_ALLAH E. F.1,2*, ABEER HASHEM3,4, ABDULAZIZ A. ALQARAWI1, DINA A. W. SOLIMAN3 AND MAI AHMAD ALGHAMDI3
1Plant Production Department, College, of Food & Agricultural Sciences, King Saud University, P.O. Box 2460 Riyadh 11451, Saudi Arabia 2Seed Pathology Department, Plant Pathology Research Institute, Agriculture Research Center, Giza 12511, Egypt 3Botany and Microbiology Department, College, of Science, King Saud University, P.O. Box 2460 Riyadh 11451, Saudi Arabia 4Mycology and Plant Disease Survey Department, Plant Pathology Research Institute, Agriculture Research Center, Giza 12511, Egypt *Corresponding author’s email: eabdallah@ksu.edu.sa
Abstract
Present study was aimed to investigate the role of selenium in amelioration of cadmium stress in Chlamydomonas reinhardtii. Cadmium treatment growth declined by reducing the pigment synthesis and increasing the oxidative damage to membranes. Selenium supplementation caused a significant decline in hydrogen peroxide production and hence the rate of lipid peroxidation which was well correlated with the increase in the activities of antioxidant enzymes including superoxide dismutase, catalase, ascorbate peroxidase and glutathione reductase. Proline increased due to supplementation of selenium and optimised the synthesis of nitric oxide for better counteracting the cadmium stress. Supplementation of selenium protected membrane structures in C. reinhardtii from the cadmium stress by maintaining the higher contents of polyunsaturated fatty acids.
Key words: Antioxidants, Lipid peroxidation, Fatty acids, Cadmium, Chlamydomonasreinhardtii, Selenium.
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