Acropetal differentiation of the cambium layer continues as the primary root elongates.

形成层的向顶分化像初生根伸长一样在继续进行。

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By the two pathway of inducing bud differentiation and wound, study on different plant growth regulator and concentration affect germination of explant and root.

通过诱导芽分化和诱导愈伤两种途径，研究不同植物生长调节剂及浓度，对外植体萌发和生根的影响。

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At the same time the differentiation process of the root primordium, and the effect of hilling up with earth on the process have been carefully followed.

一年生插条苗的根原基形成时间、部位和分化的过程，以及培土措施对根原基分化的影响。

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