THE POSSIBLE ROLE OF MEMBRANE ELECTROPHORESIS IN THE POLAR TRANSPORT OF IAA AND OTHER SOLUTES IN PLANT TISSUES
THE POSSIBLE ROLE OF MEMBRANE ELECTROPHORESIS IN THE POLAR TRANSPORT OF IAA AND OTHER SOLUTES IN PLANT TISSUES
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膜电泳在 IAA 和其他溶质在植物组织中的极地迁移中的可能作用
DOI：
10.1111/j.1469-8137.1979.tb02654.x
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发表时间：
1979
期刊：
影响因子：
9.4
通讯作者：
J. Raven
中科院分区：
文献类型：
--
作者：
J. Raven
摘要IAA在高等植物幼芽组织中的极性运输需要细胞质膜中膜运输位点的不对称分布。IAA运输的“化学渗透”假说要求IAA-单向转运体主要位于细胞的基底侧。本文认为，由于IAA的运输激活了质膜H ~+的流出，导致了质膜电位差的纵向梯度（PD），并通过载体的膜电泳过程维持和加强了载体的这种对称分布。这种不对称分布的起源（因此极性IAA运输）可能在于发育胚胎周围母体组织的电位差。极性通过种子休眠的维护可能与梯度细胞壁固定电荷（因此电位差）沿着与糖醛酸含量的细胞壁在细胞发育的不同阶段的芽轴。测试这一假设的可能性，其相关性在植物中的其他极性运输现象，进行了简要讨论。
SUMMARY Polar transport of IAA in young higher plant shoot tissue requires an asymmetric distribution of membrane-transport sites in the plasmalemma of the cells. The 'chemiosmotic' hypothesis of IAA transport requires that IAA- uniporters be largely on the basal side of the cells. It is suggested that the longitudinal gradient of electrical potential difference (PD, base positive to apex) which may result from activation of plasmalemma H+ efflux in the basal cells by transported IAA, may serve to maintain and reinforce this asynmmetric distribution of carriers by the process of membrane electrophoresis of the carriers. The origin of this asymmetric distribution (and hence of polar IAA transport) may lie in electrical potential differences in maternal tissue around the developing embryo. Maintenance of polarity through seed dormancy may be related to gradients in cell-wall fixed charges (and hence of electrical potential difference) along the shoot axis related to the uronate content of cell walls at different stages of cell development. The possibility of testing this hypothesis, and its relevance to other polar transport phenomena in plants, are briefly discussed.