pith GRE

1.The pith of this stemlike stele appears rather strongly like collenchyma tissue.

茎状中柱显得颇强健，像厚角组织。

2.Collateral or bicollateral vascular bundle, developmental pith and medullary ray are obvious.

部发达，射线明显。

3.Plenty of laticiferous tubes were included in roots, stems and leaves.Intraxylary phloem formed around the pith.

围形成一环内生韧部，这些结构特征使罗布麻能更好适应干旱、盐碱等恶劣环境。

4.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.

位于顶端分生组织中部，、层、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层原。