A novel physiological role of cyclic electron transport around photosystem I

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K20962
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Plant molecular biology/Plant physiology; Crop production science
• Research Institution: The University of Tokyo
• Principal Investigator: Yamori Wataru 東京大学, 大学院理学系研究科(理学部), 准教授 (90638363)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 光合成 / 電子伝達 / 炭素同化 / 環境応答 / 変動光 / NDH complex / PGR5

Outline of Final Research Achievements

Since plants experience a highly variable light environment over the course of the day, plants need a highly responsive regulatory system to keep photosynthetic light reactions in balance with the needs and restrictions of the downstream metabolism. To reveal the molecular mechanisms of their photosynthetic response to fluctuating light, we examined the role of two cyclic electron flows around photosystem I (CEF-PSI); one depending on PGR5 (PROTON GRADIENT REGULATION 5) and PGRL1 (PGR5-LIKE PHOTOSYNTHETIC PHENOTYPE 1) proteins and one on chloroplast NADH dehydrogenase-like (NDH) complex. The present study revealed that both PGR5/PGRL1-dependent and NDH-dependent CEF-PSI have physiological roles in sustaining photosynthesis and growth of rice under fluctuating light.

Free Research Field

植物生理生態、植物分子生理、作物生産