Study on a novel jasmonic acid-regulating complex in rice disease resistance against Xanthomonas oryzae pv. oryzae

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K05648
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 39040:Plant protection science-related
• Research Institution: Kagawa University
• Principal Investigator: Gomi Kenji 香川大学, 農学部, 教授 (50511549)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 植物感染生理 / 植物ホルモン / 植物病害抵抗性

Outline of Final Research Achievements

Rice is one of the most important staple food crop. It has been estimated to be as the main source of nutrition for 50% (about 3.5 billion people) of the world population. Rice diseases caused by phytopathogens have always had a huge damage on rice production. In this study, we revealed the importance of a plant hormone, jasmonate (JA), in rice defense response. We further identified two key regulators, OsSRO1a and OsFHA1, which have important role in rice JA signaling.
It has been revealed that OsSRO1a and OsFHA1 form a complex with OsNINJA1 and act as negative regulators in rice JA-mediated defense response.
Taken together, we revealed a novel JA signaling pathways regulated by OsSRO1a and OsFHA1 in rice. These findings provide further insight into the mechanism of JA-induced defense response in rice.

Free Research Field

植物病理学

Academic Significance and Societal Importance of the Research Achievements

イネの病害抵抗性研究は、世界の約３０億人の主食の収量増加に直結する重要な研究であるが、その病害抵抗性誘導機構に関しては未解明な部分が多く、特に植物ホルモンによって制御されている病害抵抗性機構はほとんど明らかとなっていない。本研究のように、イネ病害抵抗性機構に重要な植物ホルモンであるジャスモン酸を制御する因子を一つ一つ解明し、イネにおけるジャスモン酸シグナル伝達機構を詳細に解明していくことにより、将来の分子育種技術を生かした耐病性イネ作出時に非常に重要な知見を提供できるようになる。