2010 Fiscal Year Final Research Report

Mechanisms regulating sink formation of soybean under elevated CO_2 and temperature conditions

Research Project

Project/Area Number	20380009
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Crop science/Weed science
Research Institution	Tohoku University
Principal Investigator	KOKUBUN Makie Tohoku University, 大学院・農学研究科, 教授 (40323084)
Co-Investigator(Kenkyū-buntansha)	WATANABE Hajime 新潟大学, 農学研究科, 准教授 (10292351) SAMESHIMA Ryoji 独立行政法人農業・食品産業技術総合研究機構, 東北農業研究センター, チーム長 (70355452)
Project Period (FY)	2008 – 2010
Keywords	ダイズ / 高二酸化炭素 / 高温 / 莢実形成 / 窒素固定 / 光合成
Research Abstract	We analyzed physiological mechanisms regulating sink formation of soybean under elevated CO_2 and temperature conditions, with emphasis placed on the capacity of nitrogen fixation and photosynthesis. Under elevated CO_2 and temperature conditions, nitrogen fixation and photosynthesis were significantly enhanced at the early growth stage, whereas they were depressed at the later growth stage. This elevated CO_2-induced down-regulation was associated with the decreased leaf activity, which was probably due to decreased transpiration, increased leaf temperature and accumulation of photoassimilate in leaves under elevated CO_2 and temperature conditions.

(4 results)