原生木质部

原生木质部：初生木质部的成分，最早由原形成层形成。

Protoxylem The PRIMARY XYLEM elements that are formed from the procambium first .

环状加厚：原生木质部导管和管胞的内层环状？？厚。

Annular thickening Rings of thickening laid down on the inner wall of protoxylem vessels and tracheids .

根内原生木质部3～5原型；

The protoxylem inside the root with 3-5 protoxylem poles ;

在茎原生木质部和次生木质部的形成过程中可以看到这种类型的分化。

Basipetal differentiation is seen in the formation of proto-and metaxylem in the stem .

伸向子叶的子叶迹，直接由原生木质部极外面的一群薄壁组织细胞分化形成。

The extending cotyledon traces differentiate directly from the parenchymatous cells which locate on the outside of the poles of primary xylem .

在根的初生结构中，柴胡皂苷分布于表皮、皮层、中柱鞘、初生韧皮部及原生木质部的薄壁组织细胞内，其中中柱鞘和韧皮部是主要的分布部位。

In the primary structure , saikosaponin was distributed in parenchyma cells of the epidermis , cortex , pericycle , primary phloem and protoxylem , among which pericycle and primary phloem were the main storage site .