| Project/Area Number |
18H02206
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 39040:Plant protection science-related
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| Research Institution | Okayama University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
津下 誠治 京都府立大学, 生命環境科学研究科, 教授 (10254319)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2020: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2019: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2018: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
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| Keywords | 紋枯病菌 / Rhizoctonia solani / エフェクター / 感染生理 / ミナトカモジグサ / イネ / 活物寄生 |
|---|
| Outline of Final Research Achievements |
The filamentous fungus Rhizoctonia solani causes sheath blight, an important disease of rice. Its infection strategy remains unclear. In this study, we analyzed the expression of the small secretory protein (so-called effector) encoding genes of Rhizoctonia solani during the infection process in a model pathosystem developed using Brachypodium distachyon, an experimental monocotyledonous plant. As a result, we confirmed that the fungus uses them in the early infection stage before necrosis induction. In contrast to conventional recognition, it was suggested that the fungus undergoes a biotrophic stage of suppressing plant immunity before killing the host.
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| Academic Significance and Societal Importance of the Research Achievements |
本菌は激しい壊死斑を誘導するため、宿主を殺して栄養を摂取する殺生菌に分類されています。本研究により、本菌は宿主を殺す前に組織内に侵入し、そこで分泌型のタンパク質であるエフェクターを放出することで、宿主免疫を抑制しながら寄生を成立させる活物寄生と呼ばれるステップを経ると推測されました。植物は活物寄生菌に対する効率的な免疫系を持つことから、その原理を利用した本菌への耐病性付与の有効性が示唆されました。
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