中国农业科学(英文版)2004，Vol.3Issue(2)：129-135,7.
Photosynthetic Characteristics and Ultrastructure of Chloroplast of Cucumber Under Low Light Density in Solar-Greenhouse
Photosynthetic Characteristics and Ultrastructure of Chloroplast of Cucumber Under Low Light Density in Solar-Greenhouse
AI Xi-zhen 1GUO Yan-kui 1CHEN Li-ping 1XING Yu-xian1
作者信息
- 1. College of Horticulture, Shandong Agricultural University, Tai′an 271018, P.R.China
- 折叠
摘要
Abstract
The photosynthetic characteristics and ultrastructure of chloroplast of cucumber in solargreenhouse were studied. The result showed that the photosynthetic rate (Pn), photosynthetic ability (A350), carboxylation efficiency, light saturation point and light compensation point all declined remarkably under lowlight density, indicating that the photosynthetic characteristics of cucumber were closely related to light environment. Under iow light density, the minimal fluorescence (Fo), alterable fluorescence (Fv), photochemical efficiency of PS Ⅱ (Fv/Fm), steady fluorescence in light (Fs), maximal fluorescence (Fm′) and actual efficiency of PS Ⅱ (φPSⅡ)etc increased, indicating that the photochemical activity and efficiency for solar energy transformation enhanced, thus the light proportion used to electron transport also increased. The chlorophyll a, b, a/b and carotenoid of shading leaves decreased. However, the depressed extent of Chl a and Chl a/b were obviously larger than that of Chl b. The number of chloroplast and starch grain in cucumber leaves descended, but that of grana and lamella increased as a shaded result. The size of chloroplast and starch grain of shading leaves minished.关键词
Cucumber/Low light density/Photosynthetic characteristics/Ultrastructure of chloroplastKey words
Cucumber/Low light density/Photosynthetic characteristics/Ultrastructure of chloroplast分类
农业科技引用本文复制引用
AI Xi-zhen,GUO Yan-kui,CHEN Li-ping,XING Yu-xian..Photosynthetic Characteristics and Ultrastructure of Chloroplast of Cucumber Under Low Light Density in Solar-Greenhouse[J].中国农业科学(英文版),2004,3(2):129-135,7.
