Photosynthetic and Respiratory Acclimation to Experimental Warming for Four SpeCies in a Tallgrass Prairie Ecosystem

作     者：Xuhui Zhou Xiaozhong Liu Linda L. Wallace Yiqi Luo 

作者机构：Department of Botany and Microbiology University of Oklahoma Norman Oklahoma 73019 USA 

出 版 物：《Journal of Integrative Plant Biology》 (植物学报（英文版）)

年 卷 期：2007年第49卷第3期

页      面：270-281页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 0713[理学-生态学] 

基　　金：Supported by US National Science Foundation (NSF) (DEB 0078325  DEB 0092642  and DEB 0444518)  and US Department of Energy (DE-FG03- 99ER62800). Publication of this paper is supported by the National Natural Science Foundation of China (30624808) and Science Publication Foundation of the Chinese Academy of Sciences.Acknowledgements The authors thank Dr Edwin Kessler for the donation of his farm to the University of 0klahoma for the research 

主　　题：acclimation Ambrosia psilostachya climatic warming photosynthesis respiration Sorghastrum nutans tallgrass prairie temperature 

摘      要：Global temperature has been Increased by 0.6 ℃ over the past century and is predicted to Increase by 1.4-5.8 ℃ by the end of this century. It is unclear what impacts global warming will have on tallgrass species. In the present study, we examined leaf net photosynthetic rate （P.） and leaf respiration rate in darkness （Rd） of Aster erlcoldes （L.） Nesom, Ambrosia psllostachya DC., Helianthus mollis Lam., and Sorghastrum nutans （L.） Nash In response to experimental warming in a tallgrass prairie ecosystem of the Great Plains, USA, in the autumn （fall） of 2000 and through 2001. Warming has been Implemented with infrared heaters since 21 November 1999. The P. increased significantly In spring, decreased in early fall, and did not change in summer and late fall in the four species under warming compared with control. The Rd of the four species increased significantly until mid-summer and then did not change under warming. Measured temperature-response curves of P. showed that warming Increased the optimum temperature of P. （Topt） by 2.32 and 4.59 ℃ for H. mollis and S. nutans, respectively, in August, whereas there were no changes in May and September, and A. ericoldes and A. psllostachya also showed no changes in any of the 3 months. However, P. at optimum temperature （Popt） showed downregulation in September and no regulation in May and August for all four species. The temperature-response curves of Rd Illustrate that the temperature sensitivity of Rd, Q10, was lower in the warmed plots compared with the control plots, except for A. ericoides in August, whereas there were no changes In May and September for all four species. The results of the present study indicate that photosynthetic and respiratory acclimation varies with species and among seasons, occurring In the mid-growing season and not in the early and late growing seasons.