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関連する概念動画

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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.
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TMKベースの細胞表面オキシンシグナルが細胞壁の酸性化を活性化する

Wenwei Lin1,2, Xiang Zhou1,2, Wenxin Tang1

  • 1FAFU-UCR Joint Center for Horticultural Biology and Metabolomics, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China.

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|October 28, 2021
PubMed
まとめ

トランスメンブランキナーゼ (TMKs) は,オクシン誘発の植物細胞膨張の重要なステップであるプラズマ膜H+-ATPASEを直接活性化します. この発見は,オクシンシグナルが 細胞壁の酸性化と植物の成長をどのように引き起こすかを明らかにしています

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Measuring Plant Cell Wall Extension Creep Induced by Acidic pH and by Alpha-Expansin
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科学分野:

  • 植物生物学
  • 分子信号
  • 細胞生理学

背景:

  • 植物ホルモンのオクシンは 細胞の膨張を含む 重要な植物プロセスを調節します
  • 酸性成長仮説は,細胞壁酸性化によるオクシン刺激による細胞膨張を説明するが,その背後にあるメカニズムは不明である.
  • アクシンはプラズマ膜H+- ATPasesを活性化しますが,活性化プロセスは十分に理解されていません.

研究 の 目的:

  • アクシンが血H+-ATPASEを活性化するメカニズムを解明する.
  • アクシン知覚とH+-ATPaseの活性化をつなぐ信号経路を特定する.
  • トランスメブランキナーゼ (TMKs) のオクシン媒介細胞膨張における役割を調査する.

主な方法:

  • アラビドプシスの遺伝子,生化学,分子分析
  • TMKsとH+-ATPasesの相互作用を共免疫プレシピテーションを用いて調査した.
  • H+-ATPasesのTMK依存型リン酸化を評価し,下皮細胞の伸びを測定した.

主要な成果:

  • TMKオクシンシグナル伝達タンパク質は,プラズマ膜のH+- ATPasesと直接相互作用する.
  • アクシンは迅速なTMK-H+-ATPase相互作用とTMK依存のH+-ATPaseのリン酸化を誘発する.
  • TMKはオクシン誘発のH+-ATPase活性化,細胞壁酸性化,および下皮細胞の延長に不可欠である.

結論:

  • TMKsは直接リン酸化し,血H+ATPasesを活性化させ,オクシンシグナル伝達に直接リンクを確立する.
  • このTMKベースの経路は,オクシン誘発のアポプラスティック酸化と植物細胞の膨張に不可欠です.
  • TMKベースの細胞表面シグナリングが,植物成長に対するオクシン効果の重要なレギュラーであることを明らかにした.