Responses of growth and maintenance respiration to high CO2

2014 Fiscal Year Final Research Report

• Project Area: Comprehensive studies of plant responses to high CO2 world by an innovative consortium of ecologists and molecular biologists
• Project/Area Number: 21114007
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Biological Sciences
• Research Institution: The University of Tokyo
• Principal Investigator: TERASHIMA Ichiro 東京大学, 理学(系)研究科(研究院), 教授 (40211388)
• Co-Investigator(Kenkyū-buntansha): NOGUCHI Ko 東京大学, 大学院理学系研究科, 准教授 (80304004) ; TANEDA Haruhiko 東京大学, 大学院理学系研究科, 助教 (90403112)
• Project Period (FY): 2009-04-01 – 2015-03-31
• Keywords: 呼吸 / 高CO2 / C/Nバランス / 気孔 / 葉肉コンダクタンス

Outline of Final Research Achievements

We analyzed growth of shoots and roots of Arabidopsis thaliana in elevated CO2 a 780 ppmv with special reference of the effects of pH and nitrogen contents of the rooting medium. We also followed diurnal changes in respiration rate were followed and limiting steps were examined based on the metabolome data. Using Commelina communis, we showed involvement of soluble signal(s) from the mesophyll in stomatal opening/closure. The signal is especially important in closure of stomata in response to high CO2. We also showed High CO2 air decreases conductance for CO2 diffusion from the intercellular space to the chloroplast stroma in Nicotiana plumbaginifolia and A. thaliana. The conductance also decreased in response to ABA, but the mechanisms responsible for the decrease were different.

Free Research Field

植物生理生態学