IMPORTANCE OF CELL-SIZE IN WATER RELATIONS OF PLANTS
IMPORTANCE OF CELL-SIZE IN WATER RELATIONS OF PLANTS
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DOI：
10.1111/j.1399-3054.1977.tb04068.x
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发表时间：
1977-01-01
影响因子：
6.4
通讯作者：
LOOMIS, RS
中科院分区：
文献类型：
--
作者：
CUTLER, JM;RAINS, DW;LOOMIS, RS
棉花（Gossypium hirsutum L.）检查了在水分亏缺条件下伴随发育的叶片。细胞大小较小，细胞壁厚度较大，在胁迫植物的叶片比在良好浇水植物的叶片。对文献的简短回顾表明，较小的细胞大小是一个相当普遍的观察，它可能有助于植物抵抗水分胁迫。一个简单的模型被开发来研究细胞尺寸的减少对细胞水关系的影响。从这个模型的模拟得出的预测是，较小的细胞应保持膨压较低的值的水势比较大的细胞。而大的变化，细胞水的关系预测细胞大小的小变化。这些效应主要与细胞壁中细胞水的比例变化有关，细胞水位于质膜和渗透调节系统之外。这一预测与对胁迫硬化植物的行为的几个观察结果一致，并支持细胞尺寸较小的植物或组织更能耐受低水势的假设。
Several structural changes in cotton (Gossypium hirsutum L.) leaves attendant on development under conditions of water deficit were examined. Cell size was less and cell wall thickness greater in the leaves of stressed plants than in leaves of well-watered plants. A short review of the literature suggested that the lesser cell size is a fairly general observation and that it may contribute to plant resistance to moisture stress. A simple model is developed to investigate the influence of the reduction of cell size on cellular water relations. The predictions which were drawn from simulations with this model are that smaller cells should maintain turgor to lower values of water potential than larger cells. Rather large changes in cell water relations are predicted for small changes in cell size. These effects are related principally to the changing proportion of cell water which resides in the cell wall and is external to the plasmalemma and the osmotic adjustment system. This prediction is in agreement with several observations on the behavior of stress-hardened plants and supports the hypothesis that plants or tissues with the smaller cell size will be more tolerant of low water potential.