徐州马拉松:伴细胞是什么?

来源:百度文库 编辑:高校问答 时间:2024/04/27 04:09:41
如题,谁能解释一下什么是伴细胞?

伴细胞是植物上的,在植物的韧皮部旁边,作用是调节植物内部的水分和糖分的平衡。

A specialized parenchyma cell, located in the phloem of flowering plants and closely associated in development and function with a sieve-tube element.
Companion cells probably provide ATP, proteins, and other substances to the sieve-tube elements, whose cytoplasm lacks many structures necessary for cell maintenance.
对筛管起辅助作用的

就是伴胞

我学过三年生物,还没听说过这个词呢