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関連する概念動画

Primary and Secondary Growth in Roots and Shoots03:02

Primary and Secondary Growth in Roots and Shoots

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Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.
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Morphogenesis02:19

Morphogenesis

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Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.
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Determining the Plane of Cell Division02:13

Determining the Plane of Cell Division

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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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Cells Coordinate Growth and Proliferation02:36

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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
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Meristems and Plant Growth02:36

Meristems and Plant Growth

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Plants grow throughout their lives; this is called indeterminate growth, and it distinguishes plants from most animals. Although certain parts of plants stop growing (e.g., leaves and flowers), others grow continuously—like roots and stems.
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Role Of Notch Signalling In Intestinal Stem Cell Renewal01:12

Role Of Notch Signalling In Intestinal Stem Cell Renewal

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Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
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関連する実験動画

Updated: Jun 7, 2025

Confocal Live Imaging of Shoot Apical Meristems from Different Plant Species
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SPL13は,方向性のある細胞分裂を誘発することによって,根の頂上メリステムの相変化を制御します.

Baojun Yang1,2,3,4, Yanbiao Sun1,2, Max Minne1,2

  • 1Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium.

Science (New York, N.Y.)
|November 14, 2024
PubMed
まとめ

新しい小分子は,SQUAMOSA PROMOTER BINDING PROTEIN-LIKE13 (SPL13) の発現を,根のアピカルメリステム (RAM) で誘発し,指向した細胞分裂を引き起こします. この発見は 植物相変化に対する 分子制御を明らかにしています

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Long-term, High-resolution Confocal Time Lapse Imaging of Arabidopsis Cotyledon Epidermis during Germination
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High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications
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関連する実験動画

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Long-term, High-resolution Confocal Time Lapse Imaging of Arabidopsis Cotyledon Epidermis during Germination
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High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications
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科学分野:

  • 植物生物学
  • 発達生物学
  • 分子遺伝学

背景:

  • オリエンテッド・セル・ディビジョンは 植物形態学とサイズに不可欠です
  • これらの分割の調節,特に根のアピカルメリステム (RAM) は完全に理解されていません.
  • 植物の発達には 異なる幼生期と成人期が含まれるが 移行を促す分子機構は不明である.

研究 の 目的:

  • RAMの指向細胞分裂を制御する分子調節体を特定する.
  • SQUAMOSA PROMOTER BINDING PROTEIN-LIKE13 (SPL13) が根の発達と段階転換における役割を調査する.
  • RAMにおける年齢依存の形態学的変化の分子基礎を解明する.

主な方法:

  • 小分子スクリーニングでSPL13発現の活性化剤を特定する.
  • アラビドプシスと米 (Oryza sativa) の根組織における遺伝子発現パターンの分析
  • SHORT ROOT (SHR) と細胞サイクル調節器に対するSPL13のダウンストリーム効果を調査する.

主要な成果:

  • RAMでSPL13発現を活性化する小分子が特定されました.
  • SPL13の活性化は,SHRと細胞サイクルレギュレータを通して,RAMの指向細胞分裂を誘導する.
  • アラビドプシスと米の両方の移行にSPL因子が不可欠である.

結論:

  • SPL13は,植物の根の頂上メリスタムの方向性細胞分裂と相変異の重要なレギュラーです.
  • 特定された小分子は,植物の年齢による発達変化を研究するためのツールを提供します.
  • この研究は,植物の根の発達における 若年期から 成人期への移行について 分子的な洞察を提供します.