Filamentous actin forms characteristic bundles in plant cells that facilitate cytoplasmic streaming. In contrast, networks of actin exhibiting fast turnover are found especially near sites of rapid cell expansion. These networks may serve various functions including delivering and retaining vesicles while preventing penetration of organelles into the area where cell growth occurs thereby allowing fast turnover of vesicles to and from the plasma membrane. Root hairs elongate by polarized growth at their tips and the local accumulation of fine F-actin near the tip has provided valuable insight into the organization of these networks. Here we will sequentially focus on the role of the actin cytoskeleton in root hair tip growth and on how activities of different actin binding proteins in the apical part of growing root hairs contribute to build the fine F-actin configuration that correlates with tip growth.

中文翻译：

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根毛中的肌动蛋白细胞骨架：尖端处都很好。

丝状肌动蛋白在植物细胞中形成特征性束，促进细胞质流。相反，特别是在细胞快速扩增的部位附近，发现了表现出快速周转的肌动蛋白网络。这些网络可以起到各种功能，包括输送和保留囊泡，同时防止细胞器渗透到发生细胞生长的区域，从而允许囊泡快速往返于质膜。根毛在其顶端通过极化生长而伸长，并且细F-肌动蛋白在顶端附近的局部积累为这些网络的组织提供了宝贵的见识。