摘要
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.
以无性繁殖的一年生莱阳矮樱桃 (PrunuspseudocerasusL .“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 36 6 μmol·m-2 ·s-1和 5 33.8μmol·m-2 ·s-1光强下活性升高 ,而在 2 2 8.8μmol·m-2 ·s-1和 83.9μmol·m-2 ·s-1光强下活性下降。
基金
国家自然科学基金 (3 0 0 70 5 3 1)。~~
