中国生态农业学报2012，Vol.20Issue(7)：895-900,6.DOI:10.3724/SP.J.1011.2012.00895
高CO2浓度和遮荫对小麦叶片光能利用特性及产量构成因子的影响
Effects of elevated atmospheric CO2 concentration and shading on leaf light utilization and yield of wheat
摘要
Abstract
CO2 and light energy are dynamic substrates of plant photosynthesis. Changes in CO2 concentration and light energy intensity lead to corresponding changes in the characteristics of plant photosynthesis and growth. It was therefore critical to study the effect of atmospheric CO2 concentration and light intensity on plant photosynthesis which could foster further understanding of the response of terrestrial ecosystem to global climate change. This study analyzed the elevated atmospheric CO2 concentration (760 μmol·mol-1) and shading effects on wheat light utilization and yield. In the study, CO2 concentrations and light intensity were set up and measures were taken on photosynthetic gas exchange parameters, light-photosynthetic response curves and yield. The relationship between light intensity and light use efficiency was analyzed and then elevated atmospheric CO2 concentration (760 umol'mor1) and shading effects on wheat photosynthesis and yield determined. Result showed that compared with normal CO2 concentration, net photosynthetic rate (Pn), maximum net photosynthetic rate (Pnmax), light saturation point (LSF) and light compensation point (LCP) of wheat leaves increased significantly under elevated atmospheric CO2 concentration. However, under shading conditions, Pnmax. LSP and LCP decreased. Under normal and elevated atmospheric CO2 concentrations, dark respiration rate (Rd) of wheat leaves decreased significantly. However, shading and elevated atmospheric CO2 concentration had no significant effect on Rd. Apparent quantum yield (AQY) of wheat leaves increased significantly with increasing atmospheric CO2 concentration. Conversely, the effect of shading on AQY changed with changes in atmospheric CO2 concentration. While shading significantly increased AQY under elevated atmospheric CO2 concentration, it significantly decreased AQY under normal CO2 concentration. While plant height and spike length increased significantly under elevated atmospheric CO2 concentration and shading, grain number, grain weight per spike and 1000-grain weight decreased significantly. Because of changes in photosynthetic characteristics and limitations in light intensity, wheat leaf respiration increased under elevated atmospheric CO2 concentration and shading conditions. This resulted in the decline of Pn, which limited dry mass accumulation and grain yield formation.关键词
小麦/旗叶/高CO2浓度/遮荫/光合作用/产量构成因子Key words
Wheat, Flag leaf, Elevated CO2 concentration, Shading condition, Photosynthesis, Yield and its component分类
农业科技引用本文复制引用
于显枫,张绪成..高CO2浓度和遮荫对小麦叶片光能利用特性及产量构成因子的影响[J].中国生态农业学报,2012,20(7):895-900,6.基金项目
国家自然科学基金项目(30800668),农业部西北作物抗旱栽培与耕作重点开放实验室、甘肃省旱作区水资源高效利用重点实验室项目(HNSJJ-201104)和甘肃省自然科学基金项目(1107RJZA208)资助 （30800668）
