At the same time the differentiation process of the rootprimordium, 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。
2
The tree-shaped structure of nodular vascular framework is connected with the vascular system of plant in the base, It was derived originally from the plant lateral rootprimordium.
它在基部与植物维管系统联成一体，在本质上是由植物侧根原基衍生而来。
3
Rhizobium sesbania infected through the apical rupture of the growing site of adventitious root, multiplied in the fissure around the rootprimordium and stimulated the division of cortex cells.