Functions of brassinosteroid in stress tolerance of rice

2014 Fiscal Year Final Research Report

• Project/Area Number: 24780005
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Breeding science
• Research Institution: Ishikawa Prefectural University
• Principal Investigator: SAKAMOTO Tomoaki 石川県立大学, 生物資源環境学部, 准教授 (00345183)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: イネ / オーキシン / 突然変異体 / 発現制御 / ブラシノステロイド / ユビキチン化

Outline of Final Research Achievements

The phytohormones auxin and brassinosteroid are both essential regulators of physiological and developmental processes, and it has been suggested that they act interdependently and synergistically. I showed that auxin stimulates brassinosteroid perception by regulating the amount of brassinosteroid receptors. Next, I found that genetic background influences brassinosteroid-related mutant phenotypes in rice and these phenomena are caused by a transposon insertion into the promoter of brassinosteroid receptor gene. Finally, I isolated a novel positive regulator of brassinosteroid signaling in rice. This protein encodes an U-box E3 ubiquitin ligase, and probably functions in interaction between brassinosteroid and another phytohormone.

Free Research Field

作物生理学