ANALYSIS OF ANTIOXIDANT SYSTEM IN TRANSGENIC 'KDML105' RICE Oryza sativa L. OVEREXPRESSING OsCaM1-1 UNDER SALINITY STRESS

Abstract

To investigate various parameters (growth, physiological and biochemical responses) associated with improved tolerance under salt stress in the transgenic rice overexpressing OsCaM1-1 gene, the control and the wild-type KDML105 differing in salt tolerance, comparatively. Three days after exposure to salt stress (150 mM NaCl), the results showed a greater increase in the photosynthetic pigment (chlorophyll a, b and carotenoid) contents, DPPH scavenging activity, relative growth rate (RGR), and the activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) in the transgenic rice plants than the control and wild-type, whereas lipid peroxidation and relative water content (RWC) showe decreased. Thus, the transgenic rice overexpressing OsCaM1-1 gene might reduce or protect salt-induced oxidative damage by enhancing antioxidant system.