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Effects of Salicylic Acid on Antioxidant Metabolism and Photosynthesis of Wheat Leaves under Heat and Irradiance Stress

MA Pei-fang,YANG Ya-jun,ZHAO Hui-jie*(College of Life Sciences,Henan Agricultural University,Zhengzhou 450002,China)  
The wheat leaves at grain-filling stage were sprayed with 0.5mmol/L of salicylic acid(SA) and then treated with high temperature and high irradiance to study the effects of salicylic acid(SA) on active oxygen metabolism and operation of photosynthetic apparatus in wheat leaves.The results showed that SA could maintain higher activities of superoxide dismutase(SOD) and ascorbate peroxidase(APX),and reduce the contents of H2O2and malondialdehyde(MDA),indicating that SA protected wheat leaves from oxidative damage caused by heat and high irradiance stress.Meanwhile,SA could alleviate the damage of heat and high irradiance to photosynthetic apparatus,and maintain higher Fv/Fm(maximum photochemical efficiency of PSⅡ),ΦPSⅡ(factual photochemical efficiency of PSⅡ),qP(non-photochemical quenching of chlorophyll fluorescence) and Pn(net photosynthetic rate).
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