原形成层（原形成层束）：形成维管组织的一层细胞。
Procambium (procambium strand) The layer of cells that gives rise to the vascular tissue.
茎中维管组织的排列方式多种多样，由此产生多种类型的中柱。
The arrangement of vascular tissue ( the vascular system ) in the stem is very varied , giving a number of different types of stele.
但GA与IAA共同使用后减少了IAA所诱导形成的茎干状结构中维管组织的细胞数。
Applying GA together with IAA decreased the number of various tissue cells in the IAA induced new trunk like structure.
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