describe the mechanism flow chart in food translocation
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PRESSURE FLOW HYPOTHESIS - DEFINITION
concept
Various theories have been put forward to explain the mechanism of phloem conduction but they are not fully satisfactory. Among them, Munch's (1930) hypothesis is most convincing.
The major steps in the mass flow theory are as follows:
Active transport/active movement of sugar (sucrose) at the source into phloem cells causes the water potential of phloem contents to become more negative.
Therefore, water flows by osmosis from adjacent cells.
This means the hydrostatic pressure in phloem increases which causes mass flow.
At another part of the plant (a sink e.g., the roots) the sugars are removed from the phloem by active transport so the gradients are maintain.
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