次生周皮
While for older roots, there are periderm, secondary phloem, cambium, secondary xylem and primary xylem. In root, the duct caliber of xylem in Akebia quinata ( Thunb.) Decne.
老根由外向内依次为:周皮、次生韧皮部、形成层、次生木质部、初生木质部。在根中五叶木通木质部导管口径比三叶木通的大很多。
Therefore, the secondary structure included periderm, pericyclic parenchyma tissue and secondary vascular tissue from the outside to the inside of taproots of Bupleurum chinense DC.
因此,北柴胡根的次生结构从外到内由周皮、中柱鞘薄壁细胞环和次生维管组织组成。
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