According To The Pressure Flow Hypothesis Of Phloem Transport,

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According To The Pressure Flow Hypothesis Of Phloem Transport,

the pressure in the phloem of a root is normally greater than the pressure in the phloem of a leaf. water is actively transported into the "source" region of the phloem to create the turgor pressure needed. solute moves from a high concentration in the "source" to a lower concentration in the "sink." the combination of a high turgor pressure in the "source" and transpiration water loss from the "sink" moves solutes through phloem conduits. the formation of starch from sugar in the "sink" increases the osmotic concentration.
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solute moves from a high concentration in the "source" to a lower concentration in the "sink."
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