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。
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 root primordium.
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。
Rhizobium sesbania infected through the apical rupture of the growing site of adventitious root, multiplied in the fissure around the root primordium and stimulated the division of cortex cells.
毛萼田菁的茎瘤形成于茎上蛰伏的不定根发生点。 当合适的根瘤菌从不定根发生点裂口入侵后，刺激不定根原基周围的皮层细胞分裂形成含菌组织而发育成茎瘤。
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