Dhonukshe Pankaj, Kleine-Vehn Jürgen, Friml Jiri
Zentrum für Molekularbiologie der Pflanzen, Universität Tübingen, Tübingen, Federal Republic of Germany.
Protoplasma. 2005 Oct;226(1-2):67-73. doi: 10.1007/s00709-005-0104-8. Epub 2005 Oct 20.
In plants, cell polarity is an issue more recurring than in other systems, because plants, due to their adaptive and flexible development, often change cell polarity postembryonically according to intrinsic cues and demands of the environment. Recent findings on the directional movement of the plant signalling molecule auxin provide a unique connection between individual cell polarity and the establishment of polarity at the tissue, organ, and whole-plant levels. Decisions about the subcellular polar targeting of PIN auxin transport components determine the direction of auxin flow between cells and consequently mediate multiple developmental events. In addition, mutations or chemical interference with PIN-based auxin transport result in abnormal cell divisions. Thus, the complicated links between cell polarity establishment, auxin transport, cytoskeleton, and oriented cell divisions now begin to emerge. Here we review the available literature on the issues of cell polarity in both plants and animals to extend our understanding on the generation, maintenance, and transmission of cell polarity in plants.
在植物中，细胞极性问题比在其他系统中更为常见，因为植物由于其适应性和灵活的发育过程，常常在胚胎后期根据内在线索和环境需求改变细胞极性。最近关于植物信号分子生长素定向运输的研究结果，在单个细胞极性与组织、器官及整个植株水平上的极性建立之间建立了独特的联系。关于PIN生长素转运蛋白亚细胞极性定位的决定，决定了细胞间生长素流动的方向，进而介导了多种发育过程。此外，对基于PIN的生长素运输的突变或化学干扰会导致异常的细胞分裂。因此，细胞极性建立、生长素运输、细胞骨架和定向细胞分裂之间复杂的联系现在开始显现。在这里，我们回顾了有关植物和动物细胞极性问题的现有文献，以加深我们对植物细胞极性产生、维持和传递的理解。
