The cross-talk between phototorpic response and phytoalexin production

2015 Fiscal Year Final Research Report

• Project/Area Number: 24658106
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Bioproduction chemistry/Bioorganic chemistry
• Research Institution: University of Tsukuba
• Principal Investigator: YAMADA Kosumi 筑波大学, 生命環境系, 准教授 (70292521)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 光屈性 / オーキシン / 光屈性制御物質 / ファイトアレキシン / クロストーク

Outline of Final Research Achievements

Cholodny-Went theory is a major model describing the positive and negative curvatures in phototropism. The directional growth is caused by an asymmetrical distribution of auxin. In contrast, evidence showing that phototropism is caused by blue light-induced local accumulation of growth inhibitors has also been presented (Bruinsma-Hasegawa theory). To clarify the mechanism of growth inhibition in response to unilateral blue light, the isolation and identification of growth inhibitors has been intensively attempted in several plant species. Interestingly, most of the inhibitors have been known as phytoalexins. Therefore, we hypothesized the possible cross-talk between phototropism and plant defense mechanism. The physiological and biochemical studies have strongly suggested that the phototropic response may be one of the responses against the environmental stresses.

Free Research Field

植物生理化学