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 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。
Ground meristem the central region of the apical meristem from which the ground tissues of pith , cortex , medullary rays , and mesophyll differentiate . in root meristem it is also called periblem 基本分生组织：位于顶端分生组织的中部，髓、皮层、髓射线以及叶肉这些基本组织均是由基本分生组织分化而成。根部分生组织也称为皮层原。
