photosynthesis under drought: Survey and analysis of the senergy dissipation mechanism that produced terrestrial plant

2017 Fiscal Year Final Research Report

• Project/Area Number: 26440139
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Plant molecular biology/Plant physiology
• Research Institution: Nagoya University
• Principal Investigator: Itoh Shigeru 名古屋大学, 理学研究科, 名誉教授 (40108634)
• Co-Investigator(Renkei-kenkyūsha): IWASAKI Ikuko 秋田県立大, 生物資源科学部, 准教授 (50312236)
• Research Collaborator: YAMAKAWA Hisanori 名古屋大学, 生命農学研究科, 博士研究員 (40456645)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 光合成 / 環境応答 / 光阻害 / 励起エネルギー移動 / クロロフィル蛍光 / 光化学系 / 乾燥耐性 / 地衣類

Outline of Final Research Achievements

Mechanisms of drought-induced extra energy dissipation were newly identified in drought-tolerant photosynthetic organisms. Analysis by picosecond fluorescence lifetime measurement revealed this mechanism in a wide variety of species. Fluorescence lifetime was shown to become shorter due to the quenching of excited state that is faster than the photoreaction rate. Similar mechanisms were identified in 5 species of cyanobacteria, 10 species of mosses, 55 species of lichens (symbionts of fungi and cyanobacteria/algae) and 1 higher plant. Different types of mechanism were identified in organisms living under various environments.

Free Research Field

植物生理学