首页|期刊导航|中国农业科学（英文版）|Effect of Methanol on Photosynthesis and Chlorophyll Fluorescence of Flag Leaves of Winter Wheat
中国农业科学（英文版）2008，Vol.7Issue(4)：432-437,6.
Effect of Methanol on Photosynthesis and Chlorophyll Fluorescence of Flag Leaves of Winter Wheat
Effect of Methanol on Photosynthesis and Chlorophyll Fluorescence of Flag Leaves of Winter Wheat
摘要
Abstract
Photosynthesis and chlorophyll a fluorescence parameters, photochemical efficiency of PS II (Fv/Fm), photochemical quenching of PS II (qP), nonphotochemical quenching of PS II (NPQ), maximum activity of PS II (Fv/Fo) as well as electron transport rate (ETR), and quantum yield of PS II (ΦPS II) were measured on flag leaves of the winter wheat treated by methanol at different concentrations. The results revealed that photosynthesis was greatly improved by methanol, as indicated by higher photosynthetic rates and stomatal conductance. The enhancement effect of methanol on photosynthesis was maintained for 3-4 days. Different methanol concentration treatments also increased intercellular CO2 concentration and transpiration rates. No significant decline was found in Fv/Fm, Fv/Fo, and ΦPS II, which revealed no photoinhibition during methanol application in different methanol concentrations. Methanol showing no apparent inhibitory effects indicated higher potential photosynthetic capacity of flag leaves of winter wheat. However, the increase in photosynthesis was not followed by an increase in the photosynthetic activity (Fv/Fm), and fluorescence parameters did not indicate an improvement in intercellular CO2 concentration and PS II photochemical efficiency compared with the control, thereby encouraging us to propose that lower leaf temperatures caused by applied methanol would reduce both dark respiration and photorespiration (most importantly), thus, increasing net CO2 uptake and photosynthetic rates.关键词
methanol, photosynthetic activity, chlorophyll fluorescence, flag leaf, winter wheatKey words
methanol, photosynthetic activity, chlorophyll fluorescence, flag leaf, winter wheat分类
农业科技引用本文复制引用
ZHENG Yue-jin,YANG Yue-qin,LIANG Shan-shan,YI Xian-feng..Effect of Methanol on Photosynthesis and Chlorophyll Fluorescence of Flag Leaves of Winter Wheat[J].中国农业科学（英文版）,2008,7(4):432-437,6.基金项目
The study was supported by the Student Research Training Program of Henan University of Science and Technology(2007142)and Program for Science and Technology Innovation Talents in Universities of Henan Province,China(2008 HASTIT003). （2007142）
