It had secondary structure and the secondary protective tissue was periderm.
具有次生结构，次生保护组织为周皮。
Periderm, lenticelle and secondary vascular tissue in the gynophore are produced due to its secondary growth.
次生生长后产生周皮、皮孔和次生维管组织。
The results showed that the taproots of transplanted P. ginseng plants consist of periderm and secondary vascular tissue.
结果表明，移山参主根结构由周皮和次生维管组织组成。
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