Loading sucrose into phloem

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  • Loading Sucrose into the Phloem
  • Sucrose is loaded into the companion cells by Active transport
  • 1. Hydrogen ions are pumped out of the cell
    • 2. There is now a large excess of H+ ions outside the cell
      • Move back into cell down concentration gradient
        • Through a protein that acts as a carrier
    • using active transport
      • and ATP as a source of energy
  • Inside the cell is now more alkaline and outside more acidic
  • The sucrose and hydrogen are carried across the co-transporter at the same times
    • against the concentration for sucrose


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