核心期刊网首页> 中文期刊> 基础科学

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


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 (Pn) and leaf respiration rate in darkness (Rd) of Aster ericoides (L.)Nesom, Ambrosia psilostachya DC., Hellanthus 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 Pn 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 Pn showed that warming increased the optimum temperature of Pn (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. ericoides and A. psilostachya also showed no changes in any of the 3 months. However, Pn 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.......

【作者名称】: Xuhui Zhou, Xiaozhong Liu, Linda L. Wallace, Yiqi Luo
【作者单位】: Department of Botany and Microbiology, University of Oklahoma, Norman, Oklahoma 73019, USA, Department of Botany and Microbiology, University of Oklahoma, Norman, Oklahoma 73019, USA, Department of Botany and Microbiology, University of Oklahoma, Norman, Oklahoma 73019, USA, Department of Botany and Microbiology, University of Oklahoma, Norman, Oklahoma 73019, USA
【关 键 词】: acclimation, Ambrosia psilostachya, climatic warming, photosynthesis, respiration, Sorghastrum nutans
【期刊名称】: 植物学报(英文版)
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 105,649,598
【摘要长度】: 1,859
【上篇论文】: 中文期刊 - Arabidopsis SOI33 AtENT8 Gene Encodes a Putative Equilibrative Nucleoside Transporter That Is Involved in Cytokinin Transport In Planta
【下篇论文】: 中文期刊 - Characterization of MASDs of surface soils in north China and its influence on estimating dust emission

【论文下载】: 免费获取 该期刊&论文全文内容