Spraying of Abscisic Acid on the Leaf Improved Drought Resistance of Plukenetia volubilis Seedling

In order to improve the drought resistance of Plukenetia volubilis and develop its planting industry, we studied the effect of pretreatment of 2～50 mol/L abscisic acid(ABA) on the drought resistance of P. volubilis seedlings. The results showed that ABA pretreatment could decrease the level of lipid peroxidation, the generation rate of superoxide anion(O2―), and content of the hydrogen peroxide(H2O2). Meanwhile, ABA increased the activities of antioxidase including superoxide dismutase(SOD), guaiacol peroxidase(GPOX), catalase(CAT), ascorbic acid peroxidase(APX) and glutathione reductase(GR). We found that the most appropriate concentration was 2～5 mol/L. Therefore, ABA pretreatment can improve the drought resistance of P. volubilis by inducing the antioxidant enzyme activities. So we consider that spray of ABA on the P. volubilis leaves are of great importance and practical applications for its planting industry.