Effects of Exogenous Salicylic Acid on Antioxidant Properties of Wheat Seedling under Drought Stress

In order to provide scientific evidence for the application of salicylic acid in the production and cultivation of wheat,the effects of exogenous salicylic acid on antioxidant properties of AK58seedling under drought stress were investigated.The results showed that the membrane permeability,malondialdehyde(MDA)content and the activities of superoxide dismutase(SOD),catalase(CAT)and ascorbate peroxidase(APX)in leaf and root were significantly increased under drought stress.Compared with drought stress alone,exogenous salicylic acid could increase the activities of APX,peroxidase(POD),SOD and CAT in root of BainongAK58by 190.9%,20.4%,42.3% and 89.4%,respectively.Exogenous salicylic acid could reduce the membrane permeability and MDA content in root of BainongAK58by 19.7% and 54.6%,respectively.For the leaves,exogenous salicylic acid could increase the activities of APX and POD by 31.5% and 159.6%,respectively.Exogenous salicylic acid could reduce the membrane permeability and MDA content in leaves of BainongAK58by 23.7% and53.9%,respectively.Above results suggested that drought stress could induce oxidative stress in Bainong AK58seedling.Meanwhile,Bainong AK58could protect itself against stress by enhancing the activities of antioxidant enzymes.Mean while,application of exogenous salicylic acid could protect Bai-nong AK58against the oxidative injury induced by drought stress by improving the activities of related antioxidant enzymes in root and leave of seedlings.