初生韧皮部是位于维管束的外侧,常由筛管、伴胞、韧皮纤维和韧皮薄壁细胞组成,主要作用是输导有机物质。茎初生韧皮部的发育方式与根的相同,也是外始式。原生韧皮部薄壁细胞发育成的纤维常成群地位于韧皮部的外方,成为初生韧皮纤维。
初生韧皮部(primary phloem):其主要功能是输导有机物质。初生韧皮部形成若干束分布于初生木质部辐射角之间,与初生木质部相间排列,这是幼根维管柱中最为突...
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初生韧皮部:指幼嫩植物中来源于原形成层的韧皮部。
Primary phloem PHLOEM derived from the procambium in the young plant.
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.
次生结构发生于根毛区,维管形成层由初生木质部和初生韧皮部之间的薄壁细胞转化形成;
Secondary structure occurs in the root hair zone, and vascular cambium is formed from the parenchyma cells between the primary xylem and primary phloem;
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