共质体，是指植物原生质体间通过胞间连丝连接而成的连续体。它与外部介质相通，是水分和养分可以自由出入的地方，养分迁移速率较快。共质体通道是靠胞间连丝把养分从一个细胞转运到相邻的细胞中，借助原生质的环流，带动养分的运输，最后向中柱转运。在共质体运输中，胞间连丝起着沟通相邻细胞间养分运输的桥梁作用。
钙离子在果实和叶片中 的运输和分配不仅通过质外体途径也通过共质体途径。
There are both apoplastic and symplastic pathways of Ca2+ transport in fruit or leaf tissue too.
经组织化学的方法研究证明，玉米幼根对铅的吸收经过了两条通道，即自由空间通道和共质体通道。
Two pathways, the "free space" and the "symplast", of absorption and translocation of lead into young roots of Zea mays were demonstrated by using histochemical method.
运用实验方法区别共质体和跨细胞途径很难，对质外体和细胞到细胞途径综合作用的水分运输也缺乏有效的研究手段加以区分。
Symplast pathway and transcelluar pathway is difficultly distinguished by Experiment methods, and have no valid ways to make distinction between apoplast and cell to cell pathway.
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