膨压和细胞大小对植物细胞壁弹性的影响。
Effect of turgor pressure and cell size on the wall elasticity of plant cells.
机构信息
Institut für Biophysikalische Chemie, Kernforschungsanlage Jülich GmbH, Postfach 1913, D-5170 Jülich, FRG.
出版信息
Plant Physiol. 1977 Feb;59(2):285-9. doi: 10.1104/pp.59.2.285.
Direct measurements of the volumetric elastic modulus, in, of cells of a higher plant were performed on the epidermal bladder cells of Mesembryanthemum crystallinum using a pressure probe technique. Measurements on giant algal cells (Valonia, Nitellopsis) are given for comparison. Giant celled algae and M. crystallinum bladders have elastic moduli, in, which depend strongly on turgor pressure, P, and on cell volume, V. The in values of Mesembryanthemum bladders range between 5 bar at zero pressure and 100 bar at full turgor pressure (3-4 bar). in increased with cell size (volume) at a given turgor pressure, and this volume dependence was pronounced more in the high pressure range. From the in (P) characteristics, complete volume-pressure curves were obtained for Mesembryanthemum bladders and giant algal cells. The results suggest that the in (P) and in (V) characteristics of all plant cells are similar. The significance of the pressure and volume effects for the water relations and growth processes of plant cells is discussed briefly.
使用压力探针技术，对高等植物的表皮膀胱细胞进行了直接测量，得到了体积弹性模量 in。为了进行比较，还给出了巨型藻类细胞（Valonia、Nitellopsis）的测量值。巨型藻类细胞和 M. crystallinum 膀胱的 in 值强烈依赖于膨压 P 和细胞体积 V。在零压力下，Mesembryanthemum 膀胱的 in 值在 5 巴之间，在完全膨压（3-4 巴）下为 100 巴。在给定的膨压下，in 值随细胞体积（体积）增加，在高压范围内这种体积依赖性更为明显。从 in（P）特性中，获得了 Mesembryanthemum 膀胱和巨型藻类细胞的完整体积-压力曲线。结果表明，所有植物细胞的 in（P）和 in（V）特性都相似。简要讨论了压力和体积效应对植物细胞水分关系和生长过程的意义。
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