Calyptogen a layer of meristematic cells covering the rootapicalmeristem in some plants (e. g. grasses) that gives rise to and maintains the root cap.
根冠原：在一些植物中覆盖根顶端分生组织的一层具有分生能力的细胞，根冠原可以产生和维持根冠。
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We speculated that a WUS-type atypical HD protein might also be involved in the specification and maintenance of the rootapicalmeristem (RAM) stem cells of rice.