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2023 Fiscal Year Final Research Report

Roles of phosphoinositid signaling in plant cell morphogenesis

Research Project

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Project/Area Number 21H02505
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 44030:Plant molecular biology and physiology-related
Research InstitutionKyoto University

Principal Investigator

Aoyama Takashi  京都大学, 化学研究所, 教授 (80202498)

Project Period (FY) 2021-04-01 – 2024-03-31
Keywords脂質シグナル / 細胞形態形成 / 細胞極性 / PI(4,5)P2 / PIP5K
Outline of Final Research Achievements

In this study, we focused on PtdIns(4,5)P2), one of the major lipid signaling molecules on the eukaryotic plasma membrane, and tried to elucidate the regulatory mechanisms for morphogenesis of plant cells including pollen and root hair cells of Arabidopsis thaliana. Genetic and reverse genetic analyses of 9 phosphatidylinositol 4-phosphate 5-kinase (PIP5K) genes revealed that PIP5K1 and 2, PIP5K2 and 3, PIP5K4-6, and PIP5K7-9 function redundantly in the cell polarity for polar auxin transport, root hair morphogenesis, pollen germination and pollen tube elongation, and the root response to high osmolality stress.

Free Research Field

植物分子生物学

Academic Significance and Societal Importance of the Research Achievements

PI(4,5)P2シグナルは、細胞骨格形成や膜交通など真核細胞内で部位特異的に起こる現象において重要な役割を果たす。本研究の結果、シロイヌナズナのPIP5K1-6はオーキシン極性輸送に関わる細胞極性、根毛伸長極性、花粉発芽および花粉管伸長における極性など、様々な細胞極性の確立に関わることが示された。一方、PIP5K7-9は高浸透圧などの環境ストレスに対する細胞内シグナル伝達に関わることが示された。これらの知見は植物における脂質シグナルの多様な機能を明らかにするとともに、根毛や花粉における脂質シグナルの改変を利用した新たな有用作物品種の開発につながる。

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Published: 2025-01-30  

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