| 单词 | calyptrogen |
| 释义 | calyptrogencalyptrogen(kəˈlɪptrədʒən)Calyptrogencalyptrogen[kə′lip·trə·jən]Calyptrogenthe formative tissue found in the growing point of a root, giving rise to the rootcap. Calyptrogen, as a rule, is characteristic of monocotyledonous plants. In most dicotyledonous plants, instead of calyptrogen, there is a tissue that also gives rise to the root’s absorbent external piliferous layer; this tissue is called dermatocalyptrogen. calyptrogencalyptrogena layer of cells covering the growing part of roots which gives rise to the root cap. |
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