phelloderm

phelloderm

1. (5) Tanning materials are abundant in pericycle cells and phelloderm cells;

(5)中柱鞘和栓内层细胞富含单宁类物质；

2. The periderm is the secondary protective tissue of the rhizome, and is composed of pellem, pellogen and phelloderm;

周皮由木栓层、木栓形成层和栓内层组成；

3. The vascular has one or three flats cells.The cork cambium originated from the pericyclic cells and created multi layer of phelloderm parenchyma cells.

木栓形成层由中柱鞘细胞恢复分裂能力而形成，并且产生多层栓内层薄壁细胞。

4. Ginsnosides distributed mainly in the assimilating tissue and phloem parenchyma cells and much less were detected in epidermis, phelloderm and collenchyma.

组织化学实验表明，绞股蓝人参皂甙主要分布在营养器官的同化组织及韧皮部薄壁细胞中，厚角组织、表皮及周皮的栓内层也有少量分布。