BIOL 1082 Lecture Notes - Lecture 11: Water Potential, Surface Tension, Stoma
Document Summary
Water and sugar transport in plants (reading: section 36. 1-36. 3 in textbook. In the symplastic route, water and solutes move along the continuum of the cytosol. This route requires substances to cross a plasma membrane once, when they first enter the plant. After entering one cell, substances can move from cell to cell via plasmodestmata. In the transmembrane route, water and solutes move out of one cell, across the cell wall, and into the neighboring cell, which may pass them to the next cell in the same way. The root hairs absorb the soil solution (water and dissolved mineral ions). The endodermis, the innermost layer of cells in the root cortex, functions as a last checkpoint for the selective passage of minerals from the cortex into the vascular cylinder. Minerals already in the symplast when they reach the endodermis continue through the plasmodesmata of the endodermal cells and pass into the vascular cylinder.
