It is constantly replaced by newly formed cells as the older tissue is sloughed off with growth of the root through the soil.

 
  • 随着根尖的生长,根冠外层的薄壁细胞与土壤颗粒磨擦,不断脱落,死亡,由其内的分生组织细胞不断分裂,补充到根冠,使根冠保持一定的厚度。
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