Biology / Unit 11 Bio 2547 short lesson, about 20 seconds
Translocation: Pressure-Flow in Phloem
Captions available
The idea
Translocation moves sugar from source tissues, where photosynthate forms, to sink tissues, where it is used or stored, via pressure-driven phloem flow.
In practice
Sucrose loading at a source lowers phloem water potential, drawing xylem water in and generating pressure that pushes sap toward the sink.
Where people slip
Unlike xylem flow, which runs only upward, phloem flow runs either direction, depending on the nearest sink's location.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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