Week8 Draft1

Xylem are inhibited when guard cells cannot open- they require ATP to open. Phloem are inhibited when active transport cannot load sugar to the phloem to create positive pressure. Xylem moves water and soil minerals. Phloem moves sugar and hormones. Xylem are under negative pressure. They are made of dead cells used for moving water. Phloem are under positive pressure. The cells of the phloem are alive cells used to pump sugars in and out from source and sink. Flexibility affects both xylem and phloem. If the cells are flexible, both will not function effectively. ATP inhibition will affect phloem and cannot transport sugar. Xylem will not function without ATP because the stomates require ATP to open.