The effect of weak light on the peroxidation of membrane lipid of one year old cherries (Prunus pseudocerasus L. “Laiyang”) was studied by whole tree shading. The results showed that the net photosynthetic rate of cherry leaves under weak light was remarkably lower; the activity peroxidase (POD) increased when light intensity decreased; the activity of catalase (CAT) showed an opposite trend, and it was positively correlated with light intensity; the activity of superoxide dismutase (SOD) increased under 366 μmol·m-2·s-1 and 533.8 μmol·m-2·s-1 light intensity, but decreased under 228.8 μmol·m-2·s-1 and 83.9 μmol·m-2·s-1 light intensity. A remarkable increase of malondialdehyde (MDA), a product of membrane lipid peroxidation, was also observed in cherry leaves when treated with weak light, indicating more serious peroxidation in the membrane.
弱光对樱桃叶片膜脂过氧化的影响
黄卫东 吴兰坤 战吉
（中国农业大学园艺学院，北京100094)
摘要：以无性繁殖的一年生莱阳矮樱桃( Prunus pseudocerasus L. "Laiyang")幼苗为试材,研究了弱光对樱桃叶片膜脂过氧化的影响.结果表明:随着光照强度的减弱,樱桃叶片的净光合速率降低;而MDA含量和膜保护酶活性在弱光下也发生明显变化,其中MDA含量和POD活性上升;CAT活性下降;SOD在366 μmol*m-2*s-1和533.8 μmol*m-2*s-1光强下活性升高,而在228.8 μmol*m-2*s-1和83.9 μmol*m-2*s-1光强下活性下降.
关键词： 弱光；樱桃；膜脂过氧化；膜保护酶
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