吲哚丁酸能够促进湖北海棠根系导管的分化，使根系的木质化程度增加。

IBA treatment can promote the root elongate growth and the root lignification of M. hupehensis Rehd. 5.

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本文通过试验证实了扦插根系发育质量与倒苗时根系木质化程度是影响定植苗成活的关键。

The experiments, proved that developmental quality of root system of cutting seedling and lignification degree of root system during seedling-laying are key factors to influence survival rate.

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PAL活力与刺槐胚轴或幼茎的维管系统即导管分子的数量和木质化程度增长趋势相一致。

And the activity of PAL coincided with the increasing tendency of the Numbers of vessel element in the plumular axis or juvenile stem of robinia and its degree of lignification as well.

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