In woody plants, tissues outside of the vascular cambium.
木本植物维管形成层外部的组织。
Results identified that the adventitious root primordia originated from the vascular cambium cells.
结果表明：试管苗不定根的根原基发生于形成层。
Wood formation is a complex process composing many biological events, occurs as a result of growth and differentiation of the vascular cambium.
木材形成是一个复杂的生物学过程，是维管形成层生长和分化出次生组织的结果。
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