Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 11, Issue 1, 2009; Page No.(49-53 )

EFFECTS OF SALINITY STRESS ON ANTIOXIDANT ENZYME ACTIVITY LEVELS IN RICE CULTIVARS

M. BALAKRISHNA AND Y. M. SHUKLA

Abstract

Salinity is one of the most important abiotic stresses especially for rice, which is grown under irrigated conditions. To elucidate the effects of salinity stress in rice, three different salinity tolerant varieties Jaya, Dandi, CSR-27 and one sensitive variety GR-3, were selected. Fifteen days old Seedlings were exposed to 0,100,150,200 mM of Nacl for 24, 48 and 72 hrs. In these four cultivars enzyme activity of superoxidedismutase, catalase and perixida.se were studied. Enzyme activity increased with salinity stress. Tolerant varieties showed high antioxidant levels than sensitive cultivar. From this investigation it can be concluded that antioxidants scavenging the reactive oxygen species induced by salt stress. SOD is a major scavenger of 0,- and its enzymatic action results in the formation of H202 and 02• Stressed plants can withstand due to the production of these antioxidants.

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