Changes in antioxidant enzymes activity and oxidative stress by abscisic acid and salicylic acid in wheat genotypes
Agarwal, S.(Indian Agricultural Research Inst., New Delhi (India). Div. of Plant Physiology) | Sairam, R.K.E-mail:[email protected] | Srivastava, G.C. | Meena, R.C.
Abscisic acid (ABA) and salicylic acid (SA) were sprayed on leaves of wheat genotypes C 306 and Hira at 25 and 40 d after sowing under moderate water stress (-0.8 MPa) imposed by adding PEG-6000 in nutrient solution. ABA and SA increased the activities of superoxide dismutase, ascorbate peroxidase, glutathione reductase, and catalase. Both ABA and SA treatments decreased the concentrations of hydrogen peroxide and thiobarbituric acid. The beneficial effect of increase in antioxidant enzymes activity and decrease in oxidative stress was reflected in increase in chlorophyll, carotenoid and water concentrations, membrane stability index, leaf area and total biomass. Low ABA and SA cocentrations (0.5 mM and 1.0 mM, respectively) were generally more effective than higher ones.
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