Study on a factor regulating novel plant hormone crosstalk involved in rice defense respponse

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05599
• 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): 2021-04-01 – 2024-03-31
• 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 crops worldwide. Jasmonic acid (JA) and salicylic acid (SA) play important roles in plant defense systems. Generally, JA- and SA-signaling interact antagonistically in dicotyledonous plants. However, a monocotyledonous plant, rice, constitutively contains high endogenous SA and the antagonistic interaction between JA and SA is unclear in rice. In this study, we revealed that JA has an important role in the rice defense response. We further revealed that JA-induced methyl salicylate (MeSA) acts as an inducer of common defense system, which is activated by both of JA and SA in rice.
Taken together, we found a novel defense system, which is a rice-specific defense system, in rice disease resistance.

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、世界の主食として極めて重要な穀物であるイネの収量増加に直結する重要な研究であるが、その詳細な抵抗性誘導メカニズムは未解明な部分が多い。本研究のように、イネの病害抵抗性誘導には、植物ホルモンであるジャスモン酸が重要であることや、他の植物ホルモンとのクロストークを一つ一つ丁寧に解明していくことにより、学術的重要性だけでなく、将来の分子育種技術を生かした耐病性イネの作出時に非常に重要な知見を提供できるようになる。