低水势下膨压与根系生长的空间分布
Spatial distribution of turgor and root growth at low water potentials.
作者信息
Spollen W G, Sharp R E
机构信息
Department of Agronomy, University of Missouri, Columbia, Missouri 65211.
出版信息
Plant Physiol. 1991 Jun;96(2):438-43. doi: 10.1104/pp.96.2.438.
Abstract
Spatial distributions of turgor and longitudinal growth were compared in primary roots of maize (Zea mays L. cv FR27 x FRMo 17) growing in vermiculite at high (-0.02 megapascals) or low (-1.6 megapascals) water potential. Turgor was measured directly using a pressure probe in cells of the cortex and stele. At low water potential, turgor was greatly decreased in both tissues throughout the elongation zone. Despite this, longitudinal growth in the apical 2 millimeters was the same in the two treatments, as reported previously. These results indicate that the low water potential treatment caused large changes in cell wall yielding properties that contributed to the maintenance of root elongation. Further from the apex, longitudinal growth was inhibited at low water potential despite only slightly lower turgor than in the apical region. Therefore, the ability to adjust cell wall properties in response to low water potential may decrease with cell development.
摘要
在水势较高（-0.02兆帕）或较低（-1.6兆帕）条件下，于蛭石中生长的玉米（Zea mays L. cv FR27 x FRMo 17）初生根中，比较了膨压和纵向生长的空间分布。使用压力探针直接测量皮层和中柱细胞中的膨压。在低水势下，整个伸长区的两个组织中的膨压都大幅降低。尽管如此，如先前报道的那样，两种处理中根尖2毫米处的纵向生长是相同的。这些结果表明，低水势处理导致细胞壁屈服特性发生了很大变化，这有助于维持根的伸长。离根尖更远的地方，尽管膨压仅略低于根尖区域，但在低水势下纵向生长受到抑制。因此，响应低水势调节细胞壁特性的能力可能会随着细胞发育而降低。
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