WATER-UPTAKE BY GROWING CELLS - AN ASSESSMENT OF THE CONTROLLING ROLES OF WALL RELAXATION, SOLUTE UPTAKE, AND HYDRAULIC CONDUCTANCE
WATER-UPTAKE BY GROWING CELLS - AN ASSESSMENT OF THE CONTROLLING ROLES OF WALL RELAXATION, SOLUTE UPTAKE, AND HYDRAULIC CONDUCTANCE
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DOI：
10.1086/297087
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发表时间：
1993-03-01
影响因子：
2.3
通讯作者：
COSGROVE, DJ
中科院分区：
文献类型：
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作者：
COSGROVE, DJ
生长中的植物细胞主要通过将水吸收到液泡中来增加体积。只有三种一般的机制，细胞可以调节水的吸收过程：（a）通过放松壁应力以降低细胞膨压（从而降低细胞水势），（B）通过改变细胞或其周围的溶质含量（同样影响水势），以及（c）通过改变水吸收途径的水力传导（这仅对远离水势平衡的细胞起作用）。最近的研究支持这些潜在的机制进行审查和批判性评估。最近的一些研究主张溶质吸收和水力传导的重要性，但证据是间接的，结论仍然存在争议。对于大多数生长中的植物细胞与大量的膨压，它出现在细胞膨压的降低，作为壁松弛的结果，作为植物细胞扩大的主要引发剂和控制点。壁松弛作为粘弹性或化学流变过程的两种观点进行了比较和区分。
Growing plant cells increase in volume principally by water uptake into the vacuole. There are only three general mechanisms by which a cell can modulate the process of water uptake: (a) by relaxing wall stress to reduce cell turgor pressure (thereby reducing cell water potential), (b) by modifying the solute content of the cell or its surroundings (likewise affecting water potential), and (c) by changing the hydraulic conductance of the water uptake pathway (this works only for cells remote from water potential equilibrium). Recent studies supporting each of these potential mechanisms are reviewed and critically assessed. The importance of solute uptake and hydraulic conductance is advocated by some recent studies, but the evidence is indirect and conclusions remain controversial. For most growing plant cells with substantial turgor pressure, it appears that reduction in cell turgor pressure, as a consequence of wall relaxation, serves as the major initiator and control point for plant cell enlargement. Two views of wall relaxation as a viscoelastic or a chemorheological process are compared and distinguished.