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《Acta Tritical Crops》 2005-04
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Protective Effects of Exogenous Salicylic Acid and Abscisic Acid Against Oxidative Damage to Wheat Leaves Caused by High Irradiance

ZHAO Hui-jie, XUE Yan-feng (College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China)  
In order to look for the measures to protect photosynthetic apparatus against damage to wheat leaves resulted from high irradiance, the influence of exogenous salicylic acid (SA) and abscisic acid (ABA) on active oxygen metabolism and photosynthesis in wheat leaves were studied. The results indicated that pretreatment with salicylic acid and abscisic acid in proper concentration could effectively protect wheat leaves from oxidative damage caused by high irradiance. Therefore, higher activity of SOD and APX and lower content of H_2O_2 and MDA in wheat leaves were maintained under the condition of photoinhibition. As a result, the increases in Fm/Fo, Fv/Fm, Φ_ PSⅡ, qP, Pn and the decrease in qN were observed under high irradiance stress. Comparatively, lower concentration of SA (50 mg·kg -1) and middle concentration of ABA(100 mg·kg -1) were most efficient.
【Fund】: 国家重点基础研究发展规划项目(G2000077907);; 河南省自然科学基础研究项目(9904011900)。
【CateGory Index】: S512.1
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