结果表明：试管苗不定根的根原基发生于形成层。
Results identified that the adventitious root primordia originated from the vascular cambium cells.
在根原基诱导培养阶段，激素种类和浓度是影响生根的关键。
The kinds and concentrations of exo-hormones were the key factors that affect rooting in vitro.
大约经12—14天，不定根原基发育为幼小不定根并伸出周皮之外。
After 12-14 days, adventitious root primordia developed into young adventitious roots.
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