本文详细描述了乌拉尔甘草(Glycyrrhiza uralensis Fisch)毛状根的外部形态和内部构造,并与其实生苗的幼根进行比较。毛状根粗细均匀,与实生苗幼根呈长圆锥形不同。内部构造纵切面观可分为根冠、生长点、延长区和成熟区四部分;横切面观不论在成熟区还是以上部分,均维持初生构造,维管束辐射型,初生木质部四原型,中央无髓,而与其实生苗的幼根在初生构造后不久迅速转入次生生长、形成次生构造不同。 This paper describes in detail the external morphology and internal structure of the hairy roots of Glycyrrhiza uralensis Fisch and compares it with the young roots of seedlings. Hairy roots are uniform in thickness and are different from long cones in young roots. The internal structure longitudinal section view can be divided into four parts: root canopy, growth point, extension zone and mature zone; the cross-sectional view maintains the primary structure in the mature area or above, the vascular beam radiation type, the primary xylem four prototype, the central no The pith, and the young roots of its seedlings, soon after the primary structure, are rapidly transformed into secondary growth and form secondary structures.