Mass flow theory of translocation
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5 Terms
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First step of mass flow theory
Active loading of sucrose into phloem
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Second step of mass flow theory
Water flows into the phloem
As water potential decreases when sucrose moves into phloem
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Third step of mass flow theory
High hydrostatic pressure in phloem as water potential increases
Water moves down the hydrostatic pressure gradient in the sieve tubes
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Fourth step of mass flow theory
Unloading sucrose from the phloem into the sink
due to concentration gradient
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Fifth step of mass flow theory
Water moves back into the xylem by osmosis
As water potential increases when sugar concentration decreases
Note 
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