初生韧皮部

结果表明，红麻初生韧皮部和次生木质部的纤维长度及其分布分别优于次生韧皮部和初生木质部；

The results showed that the primary phloem and the secondary xylem had advantages obviously in the fiber length and the fiber length distribution .

原生韧皮部：最早形成的初生韧皮部，由位于分生组织中的原形成层分化而来。

Protophloem The first-formed PRIMARY PHLOEM , differentiated from the procambium in the region just behind the meristem .

第一和第二片叶子的叶迹则在初生韧皮部中间发生。

The first and the second leaf tra - ces are organized in the middle of the primary phloem .

凹叶厚朴的树皮由外向内为周皮、皮层、初生韧皮部的纤维束和次生韧皮部。

The bark structure of Magnolia biloba , from external to internal parts , includes periderm , cortex , fibre bundies of primary phloem and secondary phloem .

初生木质部与初生韧皮部之间可见到2&3层排列规则或不规则的薄壁组织细胞，但是没有维管形成层的发生。

Between primary xylem and primary phloem there are 2 & 3 layers of parenchymatous cells , regularly or irregularly arranged , but no cambial zone can be recogni - zed .

星状中柱，初生木质部外始式，初生韧皮部呈孤岛状，呈径向辐射状排列位于初生木质部之间，中央形成微弱的髓。

It has Actinostele , primary xylem is exarch , primary phloem located between primary xylems like an island . The pith is shaped in the middle .

是初生木质部的内，外方都有初生韧皮部分布的一种维管束排列方式。

Bicollateral bundle The arrangement of tissues in the vascular bundles in which the phloem is situated on both sides of the xylem .

在根的初生结构中，柴胡皂苷分布于表皮、皮层、中柱鞘、初生韧皮部及原生木质部的薄壁组织细胞内，其中中柱鞘和韧皮部是主要的分布部位。

In the primary structure , saikosaponin was distributed in parenchyma cells of the epidermis , cortex , pericycle , primary phloem and protoxylem , among which pericycle and primary phloem were the main storage site .