Latent root primordium was not found in shoots in test tubes. The induced root primordium which originated from the division and differentiation of pith ray cell developed into the adventitious roots.

并对四倍体刺槐无性系试管苗不定根的发育过程进行了解剖观察，结果表明试管苗嫩梢无潜伏根原基，不定根由诱生根原基发育形成，诱生根原基源于髓射线细胞的分裂和分化。

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