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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Guard cells undergo constitutive and pressure-driven membrane turnover
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Guard cells undergo constitutive and pressure-driven membrane turnover

机译：保卫细胞经历本构和压力驱动的膜更新

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摘要

During stomatal movement, guard cells undergo large and reversible changes in cell volume and consequently surface area. These alterations in surface area require addition and removal of plasma membrane material. How this is achieved is largely unknown. Here we summarize recent studies of membrane turnover in guard cells using electrophysiology and fluorescent imaging techniques. The results implicate that membrane turnover in guard cells and most likely in plant cells in general is sensitive to changes in membrane tension. We suggest that this provides a mechanism for the adaptation of surface area of guard cells to osmotically driven changes in cell volume. In addition, guard cells also exhibit constitutive membrane turnover. Constitutive and pressure-driven membrane turnover were found to be associated with addition and removal of K+ channels. This implies that some of the exo- and endocytic vesicles carry K+ channels. Together the results demonstrate that exo- and endocytosis is an essential process in guard cell functioning.
机译：在气孔运动期间，保卫细胞的细胞体积以及表面积随之发生较大且可逆的变化。这些表面积的改变需要添加和去除质膜材料。如何实现这一点在很大程度上尚不清楚。在这里，我们总结了使用电生理学和荧光成像技术对保卫细胞膜更新的最新研究。结果表明，保卫细胞的膜更新以及通常最有可能在植物细胞中的膜更新对膜张力的变化敏感。我们建议这提供了一种机制，用于使保卫细胞的表面积适应渗透性驱动的细胞体积变化。此外，保卫细胞还表现出组成性膜更新。本构和压力驱动的膜更新被发现与K +通道的添加和删除有关。这暗示某些胞外和内吞小泡携带K +通道。在一起的结果表明，胞吐作用和内吞作用是保卫细胞功能的重要过程。

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