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
中，它还是适用
。在一些被子植
中，还发现了第四种组织原，即calpytrogen，
冠发生有关。
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.
然而在中，它还是适用。在一些被子植中，还发现了第四种组织原，即calpytrogen，冠发生有关。
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