Endodermis Casparian stri Symplastic and transmembrane pathways Pericycle Xylem Phloem Apoplast pathway FIGURE 4.3 Pathways for water uptake by the root Through the cortex, water may travel via the apoplast pathway, the transmembrane pathway, and the symplast pathway. In the symplast pathway, water flows between cells through the plasmod esmata without crossing the plasma membrane. In the transmembrane pathway. igure 1-5 F water moves across the plasma membranes, with a short visit to the cell wall space At the endodermis, the apoplast pathway is blocked by the Casparian stripFigure 1-5