| 释义 |
calyptrogen
calyptrogen (kəˈlɪptrədʒən) n (Botany) a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants[C19: from calyptra + -gen]Calyptrogen
calyptrogen[kə′lip·trə·jən] (botany) The specialized cell layer from which a root cap originates. Calyptrogen the 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. calyptrogen
calyptrogen a layer of cells covering the growing part of roots which gives rise to the root cap. |