本研究对甘薯块根淀粉含量高低4种不同类型35个品种根的初生结构进行了比较研究。甘薯根的初生结构,属典型的双子叶植物根结构,大部分品种维管束为五原或六原。不同品种间根的维管束数目、皮层厚薄、中柱大小是有差异的,但这些差异与块根膨大快慢,淀粉含量多少,产量高低似无相关性。 In this study, the primary structure of roots of four different types of 35 varieties of sweet potato tubers were compared. The root structure of sweet potato root is a typical dicotyledonous root structure, most of the varieties of vascular bundle of five or six original. There were differences in the number of vascular bundles, cortical thickness and column size between different varieties. However, these differences were not related to the rate of tuberous expansion, starch content and yield.