中柱包括从原形成层衍生而来的全部初生组织，由中柱鞘、韧质部和木质部组成。
The stele includes all primary tissues derived from the procambium consists of pericycle, phloem and xylem .
中柱包括从原形成层衍生而来的全部初生组织，由中柱鞘、韧质部和木质部组成。
The stele includes all primary tissues derived from the procambium consists of pericycle, phloem and xylem.
次生木质部由孔纹导管、 薄壁组织及射线所组成。
Secondary xylem consists of pitted vessels, parenchyma fibers and rays.
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