vascular cambium

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

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。

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As the vascular cambium was initiated, the interfascicular cambium was formed on the adaxial side of secondary phloem produced by the cambium. phloem developed well;

但是当维管形成层形成时，束间形成层在初生乳管的近轴一侧产生，因而随着次生形成层的活动，初生乳管被定位于次生韧皮部远轴一侧。

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With the progressive development of stem, the activity of vascular cambium began. The fascicular cambium differentiated into secondary xylem and secondary phloem, while the interfascicular cambium only differentiated into wide ray of parenchyma tissue.

随着茎的继续发育，维管形成层开始活动，由束中形成层产生次生韧皮部和次生木质部分子；而束间形成层仅产生薄壁细胞组成宽的射线。

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Secondary vascular tissue, found only in plants with secondary thickening , develops from the vascular cambium.

次生维管组织由维管形成层发育而来, 仅存在于有次生加厚的植物中.

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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.

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。

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The mechanism for the initiation and activity of vascular cambium

维管形成层发生和活动的机理

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It was analysed that the phenomenon was related to the divide and differentiate of vascular cambium cell.

分析此现象可能与维管形成层细胞的分裂分化作用有关。

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Intrafascicular cambium ( fascicular cambium) The part of the VASCULAR CAMBIUM within the vascular between the xylem and phloem.

束中形成层：是位于木质部和韧皮部构成的维管束内的一部分维管形成层。

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After vascular cambium cells divide, the progeny cells on the interior side become xylem parental cell.

维管形成层细胞分裂后，在内侧分裂出来的细胞成为木质部的母细胞。

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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.

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。

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Vascular cambium has formed, but the secondary structure is far from developed.

维管形成层已经形成，但次生结构尚不发达。

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The results of anatomical observation indicated that the graft compatibility is better when the internal structure of scion and rootstock ( the size of cambium cell, xylem/ phloem and area of vascular) is similar;

另外，解剖结构观察发现，砧木与接穗一年生茎的形成层细胞大小、木韧比（木质部/韧皮部）及导管面积越相近，两者的亲和性越好。

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Continually increase of Vascular cambium cells and formation of a root initial;

薄壁细胞不断分裂，形成不定根原基发端细胞；

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, 6-BA induced the division of vascular cambium and cortex cells.

6-BA诱导维管束中发生形成层以及诱导皮层细胞启动。

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

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；

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