Edelmann H G
Botanisches Institut, Rheinische Friedrich-Wilhelms-Universitat Bonn, Germany.
Planta. 1997 Sep;203(Suppl 1):S123-9. doi: 10.1007/pl00008100.
Gravitropic plant growth is due to gravistimulated asymmetric extension rates of the affected flanks of the graviresponding organ. Differential growth of the upper and lower flanks (UFs, LFs) of graviresponding plant organs may in principle be achieved by various biochemical and/or biophysical asymmetries. The gravistimulated mechanism(s) by which the different growth rates are determined is still unresolved, as is the mechanism of IAA-regulated growth. The purpose of this brief review is to summarize and critically evaluate data concerning gravistimulated asymmetries, especially with respect to the interface of the plasma membranes and of the extension-restricting, load-bearing epidermal cell walls (Masuda and Yamamoto 1972 Physiol Plant 27:109-115). In addition, recent results obtained by the author in experiments with rye coleoptiles will be presented and discussed in the context of a tentative model of gravistimulated wall asymmetries temporarily causing differential growth.
植物的向重力性生长是由于重力刺激导致重力响应器官受影响侧翼的不对称伸长率。重力响应植物器官上下侧翼（上侧翼、下侧翼）的差异生长原则上可通过各种生化和/或生物物理不对称性来实现。确定不同生长速率的重力刺激机制以及生长素调节生长的机制仍未得到解决。本简要综述的目的是总结并批判性地评估有关重力刺激不对称性的数据，特别是关于质膜与限制伸长、承载负荷的表皮细胞壁之间的界面（增田和山本，1972年，《植物生理学》27:109 - 115）。此外，作者在黑麦胚芽鞘实验中获得的最新结果将在重力刺激导致细胞壁不对称从而暂时引起差异生长的初步模型背景下进行展示和讨论。
