Concept
Version 8
Created by Boundless
Transportation of Photosynthates in the Phloem
Translocation to the sink
Sucrose is actively transported from source cells into companion cells and then into the sieve-tube elements. This reduces the water potential, which causes water to enter the phloem from the xylem. The resulting positive pressure forces the sucrose-water mixture down toward the roots, where sucrose is unloaded. Transpiration causes water to return to the leaves through the xylem vessels.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Transport of Water and Solutes in Plants. October 17, 2013."
http://cnx.org/content/m44708/latest/Figure_30_05_07.jpg
OpenStax CNX
CC BY 3.0.