Zheng Z L, Yang Z
Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA.
Trends Plant Sci. 2000 Jul;5(7):298-303. doi: 10.1016/s1360-1385(00)01654-x.
Pollen-tube growth not only represents an essential stage of plant reproduction but also provides an attractive model for studying cell polarity and morphogenesis. For many years, pollen-tube growth has been known to require a tip-focused Ca2+ gradient and dynamic F actin, but the way that these are controlled remained a mystery until recently. Rop appears to be activated at growth sites by a tip-localized growth cue, acting as a central switch that controls the polar growth of pollen tubes, probably having its effect through phosphoinositides and Ca2+. These findings have begun to shed light on the molecular basis of pollen-tube growth and cell morphogenesis in plants.
花粉管生长不仅是植物繁殖的一个关键阶段，而且为研究细胞极性和形态发生提供了一个极具吸引力的模型。多年来，人们已知花粉管生长需要顶端聚焦的Ca2+梯度和动态的F肌动蛋白，但直到最近，它们的控制方式仍是个谜。Rop似乎在生长部位被顶端定位的生长信号激活，作为控制花粉管极性生长的核心开关，可能通过磷脂酰肌醇和Ca2+发挥作用。这些发现已开始揭示植物花粉管生长和细胞形态发生的分子基础。
