维管形成层向两侧延伸直至形成一个茎内的分生组织环，各个维管束被束间形成层联系在一起。
The vascular cambium extends to form a complete ring of meristematic tissue around the stem, the separate vascular bundles being linked by interfascicular cambium.
植物激素通过影响砧木和接穗间维管束桥形成的时间和数目调控嫁接组合的发育。
Plant hormones controlled the formation of graft unions through influencing the time and the number of vascular bridges formation between the stock and the scion.
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