xylem tissue

With the progressive development of stem, the activity of vascular cambium began. The fascicular cambium differentiated into secondary xylem and secondary phloem, while the interfascicular cambium only differentiated into wide ray of parenchyma tissue.

随着茎的继续发育，维管形成层开始活动，由束中形成层产生次生韧皮部和次生木质部分子；而束间形成层仅产生薄壁细胞组成宽的射线。

Auxin plays a key role in regulating wood formation through its effects on cambial activity and vascular tissue differentiation in plants: controlling the period of cambial activity, maintaining the morphology and arrange orientation of fusiform cells, regulating the differentiation of phloem and xylem.

生长素在形成层活动和维管组织分化中起着极其重要的调控作用，包括：控制形成层活动周期，维持纺锤状细胞的形态和排列方向，控制木质部和韧皮部的分化。

The results showed that ginsenosides distributed mainly in the assimilating tissue and phloem parenchyma cells, very little in collenchyma, epidermis and phelloderm, and no coloration in xylem and pith parenchyma.

结果表明，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，木质部和髓薄壁组织中无皂甙分布；