Cells of the procambium and ground meristem are more vacuolated than those of the protoderm . 原形成层和基本分生组织的细胞比原表皮层细胞更加液泡化。
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。