中国矮樱桃叶片生长和光合作用对弱光环境的适应性调节

Growth and Photosynthesis Adaptation of Dwarf-Type Chinese Cherry (Prunus pseudocerasus L. cv. Laiyang) Leaves to Weak Light Stress

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。

Adaptation of leaf morphology and structure, photosynthesis, the Chl content, and the soluble protein content of one-year-old dwarf-type Chinese cherry (Prunus pseudocerasus L. cv. Laiyang) in greenhouse to weak light stress (100%, 70%, 48%, 30% and 11%) were studied by whole-tree shading. The results showed that increasing shading markedly reduced specific leaf weight and leaf thickness. The decrease of spongy tissue thickness was greater than that of palisade tissue thickness, so the ratio between palisade tissue and spongy tissue increased. Compared with the unshaded control, the net photosynthetic rate, light compensation point and light saturation point of the Chinese cherry leaves under weak light stress were remarkably lower. In contrast, there was an increase of the content of Chl a, Chl b and Chl (a+b) and the content of soluble protein of Chinese cherry leaves. The increase Chl b exceeded that of Chl a and consequently decreased the ratio between Chla and Chl b.