牛蒡根的发育解剖学研究

对牛蒡根进行了发育解剖学研究。结果表明,牛蒡根初生结构中,内皮层细胞具木质加厚,在对应初生木质部脊的部位具有通道细胞。维管形成层活动,产生含大量薄壁组织化的次生维管组织;位于次生韧皮部中的额外形成层活动,产生部分维管组织;木栓形成层活动,形成大量的、形态不规则的栓内层,三者共同作用形成牛蒡的肉质直根。

Developmental Anatomy Study on the Root of Arctium Lappa

Developmental anatomy of the Arctium lappa root is studied.The results showed that the cells of endodermis have five thickened walls in the primary structure of the roots of Arctium lappa.Opposite to the outside of the primary xylem ridge are passage cells.The activities of vascular cambium produce secondary vascular tissue that contains a large number of parenchyma.The activities of supernumerary cambium in the secondary phloem produce a certain amount of vascular tissue.The activities of cork cambium produce a great amount of phelloderms that are irregular in shape.The fleshy tap roots are the result of the above three activities.