- Mass flow can occur in EITHER DIRECTION - UP OR DOWN the plant depending on WHERE the SUGARS are needed.
- Mass flow may occur up or down the plant in the SAME PHLOEM TUBE at DIFFERENT times.
- It may be moving ASSIMILATES UP the plant in some tubes and DOWN the plant in other tubes at the SAME TIME.
Most obvious SOURCE is a LEAF from summer to winter. Act as a SINK in spring.
ROOTS are a SOURCE in some times of the year and a SINK in others.
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