(5)中柱鞘和栓
细胞富含单宁类物质；
(5) Tanning materials are abundant in pericycle cells and phelloderm cells;
,绿(5)中柱鞘和栓细胞富含单宁类物质；
(5) Tanning materials are abundant in pericycle cells and phelloderm cells;
The periderm is the secondary protective tissue of the rhizome, and is composed of pellem, pellogen and phelloderm;
周
栓
、栓
成和栓
成；
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