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。
2.
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。
3.
Signals were strong in the cell periphery of procambium , and longitudinal signals were stronger than lateral ones ; in root ground meristem cytoplasm , concentration in the perinuclear region was stronger than one in the cell periphery . in cell periphery of root ground meristem , distribution of actin mrna was heterogeneous , longitudinal signals were stronger than lateral ones ; in callus meristem cytoplasm , concentration in the perinuclear region was low ; 这表明，从棉花愈伤组织薄壁细胞到鸟巢状管胞团再到正常苗的过程中肌动蛋白mrna的分布和浓度都有明显的变化，而在这里愈伤组织在分化到鸟巢状管胞团后就不再继续发育，因而推测，肌动蛋白mrna分布和浓度可能影响愈伤组织分化出正常的植株。
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