Effects of exogenous nitric oxide on activity of antioxidative enzyme and growth of oat seedlings under salt stress

Under 150 mmol/L NaCl stress, a hydroponic experiment was conducted to investigate the effect of 0.06 mmol/L sodium nitroprusside (SNP) on antioxidative enzyme and growth of two kind of oat seedlings (Baiyan 6 and Neisan 2) at fourth leaves stage by measuring the MDA, SOD, CAT, POD, APX contents, electronic conductivity, chlorophyll contents in leaves and dry weight. The results of this study indicated that 0.06 mmol/L SNP increased the activities of SOD, CAT, POD, APX and the dry weight, and decreased MDA, chlorophyll content and membrane permeability. The antioxidant enzyme activities showed a different response to exogenous NO, in which exogenous NO had more effectiveness on SOD, CAT and APX than that on POD.