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  • Created by: Eema003
  • Created on: 29-05-16 19:41

Transfer of sucrose into sieve elements from photosynthesising tissue

  • H+ ions are actively transported out of the companion cells to the leaf and are diffused back in (due to the down concentration gradient) with sucrose.

Mass flow of sucrose through sieve tube elements

  • The sucrose then continues to diffuse into the sieve tube elements


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