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《Journal of Anhui Agricultural University》 2005-02
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Responses of Photosynthetic Characteristics,Stomatal Conductanceand Transpiration of Wheat to the Increase of Atmospheric CO_2 Concentration

JIANG Yue-lin~1,ZHANG Qing-guo~1,ZHANG Shi-ding~2,WANG Gong-ming~1,YUE Wei~1,YAO Yu-gang~11.School of Resources and Environment,Anhui Agricultural University, Hefei 230036; 2.Center for Physics and Chemistry Science, University of Science and Technology of China, Hefei 230026)  
The net photosynthesis (Pn),stomatal conductance(Cs),transpiration(Tr),water use efficiency(WUE) and chlorophyll content of wheat leaves under ambient and elevated CO_2 levels were measured, and their responses to the increase of CO_2 were discussed. The results showed that daily average Pn increased by 20.8% and 29.7% at earing stage under 550 and 750 μmol·mol~(-1),compared to the ambient air CO_2 concentration. At the same time, midday depression of photosynthesis disappeared. The average Cs decreased by 15.3% and 21.7% at different growth stages with air CO_2 enrichment. The average Tr reduced by 4.5% and 9.4%.WUE increased significantly by 19.2%~25.7% and 32.2%~45.6% in two elevated CO_2 levels. It was also found that chlorophyll a ,chlorophyll b, chlorophyll and carotenoid contents of wheat leaves increased by 11.0%~14.8%,13.0%~18.2%, 11.5%~15.7% and 15.3%~23.5% at earing stage. However, the ratio of chlorophyll a to chlorophyll b reduced under two elevated CO_2 conditions.
【Key Words】： elevated CO_2 wheat (Triticum aestivum L.) net photosynthesis stomatal conductance chlorophyll
【Fund】： 国家自然科学基金项目(70271062)资助。
【CateGory Index】： S512.1
【DOI】： CNKI:SUN:ANHU.0.2005-02-009
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