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2020 Fiscal Year Final Research Report

Regulation of nuclear gene expression by jasmonate induced by chlorophyll degradation

Research Project

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Project/Area Number 17K07430
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Plant molecular biology/Plant physiology
Research InstitutionHokkaido University

Principal Investigator

Ito Hisashi  北海道大学, 低温科学研究所, 助教 (50596608)

Project Period (FY) 2017-04-01 – 2021-03-31
Keywordsクロロフィル / 老化 / ジャスモン酸
Outline of Final Research Achievements

One of the central issues in this study is the elucidation of the relationship between chlorophyll degradation and jasmonic acid synthesis. It has been thought that plants senescence is proceeded through the action of plant hormones such as jasmonic acid, which results in the degradation of chlorophyll. However, this study showed that the degradation of chlorophyll leads to the synthesis of jasmonic acid, which induces the expression of senescence-related genes, i.e., accelerates senescence. This result suggests that chlorophyll degradation promotes senescence by plant hormones. This study demonstrates a new role for chlorophyll degradation in plants.

Free Research Field

植物生理学

Academic Significance and Societal Importance of the Research Achievements

葉が黄色くなるのは、植物が枯れるときに一番目に付く特徴です。このような葉の色の変化は、光合成色素のクロロフィルが分解されることで起きます。これまで植物ホルモンが葉の老化を進めて、その結果クロロフィルが分解されて葉が黄色くなると考えれらていました。しかし本研究では、クロロフィルの分解によって植物ホルモンの合成が合成され、その結果葉の老化が進むことが示唆されました。このような観察から、クロロフィルの分解と植物ホルモンの合成が相乗的に影響しあい、葉の老化を速やかに進めていると考えられます。

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Published: 2022-01-27  

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