In roots, however, the concept is still applied, and in some angiosperm roots a fourth histogen zone is recognized, the calpytrogen, which gives rise to the root cap.

 
  • 然而在根中,它还是适用的。在一些被子植物的根中,还发现了第四种组织原,即calpytrogen,与根冠发生有关。
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