SELENIUM AMELIORATES CADMIUM STRESS-INDUCED DAMAGE BY IMPROVING ANTIOXIDANT DEFENSE SYSTEM IN CHLAMYDOMONAS REINHARDTII

 

ABD_ALLAH E. F.^1,2*, ABEER HASHEM^3,4, 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.