Bonnett H T, Newcomb E H
J Cell Biol. 1965 Nov;27(2):423-32. doi: 10.1083/jcb.27.2.423.
The zone of root hair formation of seedling radish roots, Raphanus sativus L., was studied by phase-contrast and electron microscopy. Localized dilations of the endoplasmic reticulum, which contained a moderately dense proteinaceous material, were found to be a common component of the cytoplasm in cells of the epidermis and cortex. The surfaces of these dilations were covered with polyribosomes in discrete coils commonly composed of 15 to 17 ribosomes. The function of these structures and the fate of the material accumulated in them are unknown. Their similarity to structures described in some types of animal cells is discussed.
利用相差显微镜和电子显微镜对萝卜（Raphanus sativus L.）幼苗根的根毛形成区进行了研究。内质网出现局部扩张，其中含有中等密度的蛋白质物质，这是表皮和皮层细胞细胞质的常见组成部分。这些扩张区域的表面覆盖着多核糖体，呈离散的螺旋状，通常由15至17个核糖体组成。这些结构的功能以及其中积累物质的去向尚不清楚。文中讨论了它们与某些类型动物细胞中所描述结构的相似性。
