中国农业科学(英文版)2003，Vol.2Issue(1)：56-61,6.
Study on Photosynthesis of Different Position Leaves of Cucumber in Solar-Greenhouse
Study on Photosynthesis of Different Position Leaves of Cucumber in Solar-Greenhouse
AI Xi-zhen 1ZHANG Zhen-xian 2YU Xian-chang 1XING Yu-xian1
作者信息
- 1. College of Horticulture, Shandong Agricultural University, Tai'an 271018 , P. R. China
- 2. College of Horticulture, China Agricultural University, Beijing 100094, P. R. China
- 折叠
摘要
Abstract
The photosynthetic rate (Pn) and carboxylation efficiency (CE) were observed to be the highestin mid-position leaves of cucumber in solar-greenhouse, second in upper and middle-lower position leaves, andlowest in lower-position leaves. The saturation light of the mid-position leaves was also the highest, while thephoto compensation points of the upper, middle and lower position leaves decreased as the leaf-position descen-ded. During the growth period, the Pn of most leaves enhanced as PFD increased. Pn curves of diurnal varia-tion in different position leaves had single-peak which appeared at 12:00 a.m. As the plant density increased,the PFD of different layer leaves decreased, especially of the lower position leaves. The effect of plant densityon the Pn of the upper-position leaves was not visible, but on the light compensation points was obvious. As tolower position leaves, the Pn and saturation light decreased as the plant density increased, but the light com-pensation points were not obviously affected. Cucumber leaves had certain capacity of adaptation and adjust-ment to light intensity which expressed as the lower the PFD, the higher the apparent quantum yield (AQY).So the AQY increased as the leaf position descended and plant density increased.关键词
Cucumber/Leaf-position/Photosynthesis/Solar-greenhouseKey words
Cucumber/Leaf-position/Photosynthesis/Solar-greenhouse分类
农业科技引用本文复制引用
AI Xi-zhen,ZHANG Zhen-xian,YU Xian-chang,XING Yu-xian..Study on Photosynthesis of Different Position Leaves of Cucumber in Solar-Greenhouse[J].中国农业科学(英文版),2003,2(1):56-61,6.
