Challenge to escape shade avoidance responses of plants by modification of photoreceptor to improve productivity of crops

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14830
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Science in genetics and breeding
• Research Institution: Osaka Prefecture University
• Principal Investigator: Yoshihara Shizue 大阪府立大学, 理学(系)研究科(研究院), 助教 (20382236)
• Co-Investigator(Kenkyū-buntansha): 徳本 勇人 大阪府立大学, 理学(系)研究科(研究院), 講師 (70405348)
• Co-Investigator(Renkei-kenkyūsha): OKAJIMA Koji 慶應義塾大学, 理工学研究科, 特任助教 (20438245)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: フィトクロム / 避陰応答 / 光受容体 / GAF

Outline of Final Research Achievements

When a plant senses shade of shade using the red / far-red photoreceptor phytochrome, it shows shade-avoidance responses such as hypocotyl length and photosynthesis suppression. In this study, we aimed to promote growth and productivity by shifting the absorption wavelength of phytochrome B (phyB) to tree shade light.
(1) One of the intramolecular regions that determine the absorption characteristics of phytochrome is a GAF domain, and it has been shown that absorption characteristics can be switched by substituting GAF. (2) Substitution of the GAF domain of phyB with the GAF domain of green algal PHY1, which can be activated in the shade, resulted in a clear suppression of hypocotyl elongation of Arabidopsis thaliana, confirming a complementation of phyB function.

Free Research Field

動植物環境応答