Loading sucrose into phloem
- Created by: Molly Webb
- Created on: 13-04-15 09:49
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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
- Move back into cell down concentration gradient
- using active transport
- and ATP as a source of energy
- 2. There is now a large excess of H+ ions outside the cell
- 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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