木栓形成层

其木栓形成层由中柱鞘细胞恢复分裂能力而形成。

The cork cambium originated from pericyclic cells that resumed their dividing capabilities .

次生生长主要是依靠维管形成层和木栓形成层的活动来完成。

The secondary growth mainly relied on activities of vascular cambium and cork cambium .

由于木栓形成层活动的规律不同，所以出现有各种各样的树皮。

Active rule of cork cambium is different in different trees , so form the many types of bark .

同时，运用石蜡切片法研究剥皮后愈伤组织的形成、木栓形成层和维管形成层的发生；

Meanwhile , paraffin-cut section method was used for studying on callus formation , cork cambium and vascular cambium initiation .

但中柱鞘细胞在形成木栓形成层前，先进行平周分裂，形成了由多层细胞组成的中柱鞘细胞环。

However , before forming the cork cambium , pericyclic cells produced many layers pericyclic parenchyma cells by periclinal division .

大约15天左右在愈伤组织近表面细胞中发生木栓形成层，以后迅速形成正常的周皮。

About 15 days after girdling , a cork cambium developed near the surface of callus , then developed normal periderm rapidly .

其次，缺钾可能影响茎中木栓形成层的正常发生，以及影响维管形成层的细胞分裂活动，并可能干扰韧皮部纤维的正常发育。

Secondly , It may effected the normal formation of phellogen and the mitosis of cambium in stem , as well as the normal development of phloem fibers .

但在以后的发育过程中，木栓形成层产生了多层栓内层薄壁细胞，维管形成层则产生了大量高度薄壁组织化的次生维管组织，从而形成了肉质膨大的块根。

The main cause of root tuber expanding is that phellogen produces many layers of phelloderm parenchyma cells and vascular cambium produces a lot of secondary vascular tissue that consists of parenchyma .

其根为二原型，发育过程可分为初生生长和次生生长，成熟根的结构以次生结构为主，次生生长主要依靠维管形成层和木栓形成层的活动来完成。

The primary xylem of root is diarch , of which developmental process contains primary growth and secondary growth . Secondary growth mainly depends on the activity of the vascular cambium and cork cambium .

显微鉴别发现，药材的组织构造在木栓层、形成层、导管、石细胞等方面有差异。

Microscopic identification were studied , and the results showed that histological structure of the medicinal material had differences in dork layer , cambium , vas and stone cell .