Review on molecular mechanisms of Casparian strip formation in root endodermal cells and its regulatory roles in mineral nutrient transport(植物根系内皮层凯氏带形成的分子机制及对矿质养分转运调控综述)
Plants rely on their roots to absorb water and mineral nutrients from the soil to ensure their growth and development. To cope with various soil environments, plants form a hydrophobic ring-like structure called the Casparian strip (CS) in the cell walls of the endodermal cells of their root systems...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2025-06-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://doi.org/10.3785/j.issn.1008-9209.2024.02.021 |
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| Summary: | Plants rely on their roots to absorb water and mineral nutrients from the soil to ensure their growth and development. To cope with various soil environments, plants form a hydrophobic ring-like structure called the Casparian strip (CS) in the cell walls of the endodermal cells of their root systems. This structure serves as a physical barrier to apoplastic transport for the selective absorption and transport of water and nutrients from the soil solution. Casparian strip functions to prevent harmful substances from entering the stele; also, it limits the leakage of mineral nutrients within the vascular tissue. In the last decade, extensive studies have been conducted to investigate the specialized cell wall structure, and many breakthroughs have been achieved, including the discovery of key genes as well as molecular regulatory networks for CS formation; in parallel, the physiological roles of this apoplastic barrier in mineral nutrient translocation have been elucidated benefit from the availability of CS disruptive mutants. Here, we summarize the advances in structural characteristics, functions, and research methods of CS, highlight three major molecular pathways involved in CS formation, the conserved and diversified regulatory characteristics of CS in mineral nutrient transport among plants, and look ahead to research trends in CS formation and its contribution to mineral nutrient transport in crop plants.
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植物依靠根系从土壤中吸收水分和矿物质养分，以确保其生长发育。为了应对土壤环境的多样性，植物在根系内皮层细胞的细胞壁中形成一种可封闭临近内皮层细胞间隙的疏水性指环状结构——凯氏带。作为选择性吸收土壤溶液中水分与养分的质外体运输物理屏障，凯氏带不但阻隔了土壤中有害物质经由质外体途径自由扩散进入中柱，还可以限制维管组织内的矿质养分流失。近十几年来许多学者对凯氏带这个特殊结构开展了大量研究并取得了突破性进展，挖掘出一系列参与凯氏带形成的关键基因与分子调控途径，并揭示了凯氏带控制植物根系矿质养分运输的规律。本文针对这些进展系统总结了凯氏带结构特征和功能及相应的研究方法，重点梳理了凯氏带形成的3种分子途径和对不同植物矿质养分转运的调控规律，并展望了根系凯氏带结构及其在作物矿质养分转运调控中的研究趋势。 |
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| ISSN: | 2097-5155 |