以下为句子列表：
英文: Calyptogen A layer of meristematic cells covering the root apical meristem in some plants(e.g. grasses) that gives rise to and maintains the root cap.
中文: 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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英文: If the intercellular rhizobia were farther from meristematic nuclei, the changes of the nuclei were not very obvious, only their chromatin had started to change from lump-ship to strip-ship, but there were nucleoli in the muclei.
中文: 当胞间根瘤菌靠近分生细胞核时，细胞核变小，染色质密度增加并形成网状，而且无核仁出现。
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英文: It may develop by thickening of the secondary walls of parenchyma cells, or it may arise directly from meristematic cells.
中文: 它们可能由薄壁组织的细胞壁次生加厚而成，也可能直接来自于分生组织细胞。
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英文: Proplastid A self-duplicating undifferentiated plastid, about 0.5-1μm in diameter and found in the meristematic regions of plants. They grow and develop into plastids of different types.
中文: 前质体：能够自我复制的没有分化的质体，直径约0.5-1微米，发现于植物分生组织区域。它们生长发育为不同类型的质体。
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英文: The meristematic nuclei in wheat nodule-like were very large and rounder, a nucleus generally possessed a nucleolus, some nucleoli had nucleolar vacuoles but only a nucleolus usually had a nucleolar vacuole.
中文: 摘要在小麦类根瘤中，分生细胞核很大，而且较圆整，一般为一个核仁，有的核仁还有核仁泡，但通常一个核仁只有一个核仁泡，染色质较少，呈团块状分布。
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