在温室生长的条件下,以一年生中国矮樱桃品种‘莱阳’幼苗(Prunus pseudocerasus L. cv. Laiyang)为试材,研究了中国矮樱桃叶片生长和光合作用对不同光照环境(100%、70%、48%、30%、11%)的适应性调节。结果表明,随着光照强度减弱,樱桃叶面积变大,比叶重下降,叶片变薄,栅栏组织与海绵组织的比值上升。弱光处理还降低了樱桃叶片净光合速率、叶片光饱和点和光补偿点、叶绿素a/b比值,同时提高了叶片可溶性蛋白和叶绿素含量。
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.
