Department of Physiology and Environmental Studies, University of Nottingham, School of Agricultural Sciences, Sutton Bonington, Loughborough, Leics., U.K.
Plant Physiol. 1969 Nov;44(11):1481-7. doi: 10.1104/pp.44.11.1481.
The possible interdependence of the differential longitudinal, and the lateral movement of indoleacetic acid (IAA) in horizontal Zea coleoptile segments has been examined. The coleoptiles have been opened out into flat pieces of tissue and supplied apically with IAA-1-(14)C.Opened-out segments orientated so that all the cells correspond with those at the ;bottom' of a normal horizontal coleoptile, transport more IAA basipetally than do segments in which all the cells are equivalent to those at the ;top' of the horizontal coleoptile.In opened-out segments orientated so that all the cells are equivalent to those at the side of the horizontal coleoptile cylinder, there is no difference in the basipetal transport capacity of the upper and lower halves. This is so even if the tissue has been in the horizontal position for 90 min before being bisected into its upper and lower halves. In this ;side' tissue, however, there is a polarized downward movement of IAA. At least 95% of the (14)C in both the upper and lower halves of the tissue is confined to the IAA molecule.In horizontal Zea coleoptiles the polarized lateral movement of IAA can therefore occur independently of the differential basipetal transport of IAA in the upper and lower halves of the organ.
已研究了吲哚乙酸（IAA）在水平玉米胚芽鞘段中的差异纵向和横向运动的可能相互依赖性。将胚芽鞘展开成组织的薄片，并在顶端供应 IAA-1-（14）C。展开的段定向，使得所有细胞都对应于正常水平胚芽鞘的“底部”，比所有细胞都等效于水平胚芽鞘“顶部”的段向基输送更多的 IAA。在定向使得所有细胞都等效于水平胚芽鞘圆柱侧面的展开段中，上下两半的向基输送能力没有差异。即使组织在水平位置放置 90 分钟后再将其分为上下两半，也是如此。然而，在这种“侧”组织中，IAA 有向下的极化运动。组织上下两半中的至少 95%的（14）C 都局限于 IAA 分子中。因此，在水平玉米胚芽鞘中，IAA 的极化侧向运动可以独立于器官上下两半中 IAA 的差异向基运输而发生。
