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calyptrogen是什么意思
| 词条 | calyptrogen | 读音 | [kə'lɪptrədʒən] [kə'lɪptrədʒən] |
| 词性 | 名词 | ||
基本解释
n.根冠细胞层
例子
The calyptrogen of the tree helps to shield the delicate shoot from external damage during its early growth stages.
扩展释义
a protective covering, such as a cap or sheath, for the growing point of a plant, typically found in some gymnosperms and dicotyledons.
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