UV-A specific anthocyanin biosynthesis and protective responses in vegetable crops

2018 Fiscal Year Final Research Report

• Project/Area Number: 15H04448
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Horticultural science
• Research Institution: The University of Tokyo
• Principal Investigator: Kawabata Saneyuki 東京大学, 大学院農学生命科学研究科(農学部), 教授 (10234113)
• Research Collaborator: Li Yuhua ; Wang Yu
• Project Period (FY): 2015-04-01 – 2019-03-31
• Keywords: 紫外線 / UV-A / UV-B / アントシアニン / ROS / LED植物工場

Outline of Final Research Achievements

We focused on the UV response related to the quality of agricultural products, especially focusing on UV-A. In the seedling of 'Tsuda' turnip, UV-A fluorescent light with a peak wavelength of 350 nm induces anthocyanin synthesis. Anthocyanin synthesis was hardly observed at monochromatic irradiation of 315 to 345 nm range UV, but induced by co-irradiation of 315 nm and 355 nm. Comprehensive gene expression analysis identified a gene set which were induced specifically by UV-A, and the gene set included many genes involved in ROS related responses in addition to anthocyanin synthesis. The production of ROS under UV-A was not clear, but anthocyanin accumulation by blue light suggested the involvement of ROS in 'Tsuda' turnip seedlings.

Free Research Field

園芸学

Academic Significance and Societal Importance of the Research Achievements

これまで様々な作物においてアントシアニン合成と光との関係が調べられ，その結果，UV-Aがとりわけ重要であることが分かってきた．施設栽培では被覆資材による着色不良が生じることがある．近年普及しているLEDによる完全人工光型植物工場においては， LEDが紫外線を全く含まないため生産物の品質に負の影響が現れる懸念がある．紫外線応答を詳細に調べることにより，この課題解決の糸口が見つかることが期待される.