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2021 Fiscal Year Final Research Report

Regulatory mechanism of intracellular localization of LZY, a key factor for gravity signaling in gravitropism

Research Project

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Project/Area Number 19H03254
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 InstitutionNational Institute for Basic Biology

Principal Investigator

Morita Miyo  基礎生物学研究所, 植物環境応答研究部門, 教授 (10314535)

Project Period (FY) 2019-04-01 – 2022-03-31
Keywords重力屈性 / 重力感知 / シロイヌナズナ / シグナル伝達
Outline of Final Research Achievements

In plant gravitropism, intracellular signaling, or gravity signaling, in gravity-sensing cells is an important process that links the recognition of sedimentation of amyloplasts, which act as statoliths, to the regulation of polar auxin transport. The molecular mechanism remains unknown despite a long history of research. We have shown that LAZY1-LIKE (LZY) family proteins and their interacting factor RLD function in gravity-sensing cells and play a central role in gravity signaling. LZY protein is polarly localized to the plasma membrane of the lower side of the sensing cell upon gravi-stimulation. Meanwhile, LZY recruits RLD proteins to the plasma membrane form cytoplasm, leading to regulation of auxin transport. In this study, we investigated the molecular mechanisms of the subcellular localization and of quantitative regulation of LZY protein to understand the gravity signaling process.

Free Research Field

植物生理学

Academic Significance and Societal Importance of the Research Achievements

地球上のすべての生物は重力の下で進化してきた。ほとんどの生物が重力を感知し、何らかの応答をしていると考えられている。植物は重力を感知して成長方向を制御する重力屈性を示す。長い歴史を持つにもかかわらず、植物の重力の感知と情報伝達の分子機構は解明されていない。重力屈性は、根を水分や栄養分が豊富な地中へ、地上部を光合成や生殖に有利な上方へと配置する役割を持つ。そして、他の環境要因と共に植物の生産性に関与するプラントアーキテクチャの制御を行うことから、育種の観点からも注目される形質である。重力屈性の分子機構の解明には、以上のような学術的・社会的意義が考えられる。

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Published: 2023-01-30  

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