Explain pressure flow hypothesis oftranslocation of sugars in plants.
Explain pressure flow hypothesis oftranslocation of sugars in plants.
Accordingto the pressure flow hypothesis, food is prepared in the plant leavesin the form of glucose. Before moving into the source cells presentin the phloem, the prepared food is converted into sucrose. Watermoves from the xylem vessels into the adjacent phloem, therebyincreasing the hydrostatic pressure in the phloem. Consequently, thesucrose moves through the sieve cells of the phloem. The sucrosealready present in the sink region is converted into starch orcellulose, thereby reducing the hydrostatic pressure in the sinkcells. Hence, the pressure difference created between the source andthe sink cells allows sugars to be translocated from the former tothe latter. This starch or cellulose is finally removed from the sinkcells through active transport.
Accordingto the pressure flow hypothesis, food is prepared in the plant leavesin the form of glucose. Before moving into the source cells presentin the phloem, the prepared food is converted into sucrose. Watermoves from the xylem vessels into the adjacent phloem, therebyincreasing the hydrostatic pressure in the phloem. Consequently, thesucrose moves through the sieve cells of the phloem. The sucrosealready present in the sink region is converted into starch orcellulose, thereby reducing the hydrostatic pressure in the sinkcells. Hence, the pressure difference created between the source andthe sink cells allows sugars to be translocated from the former tothe latter. This starch or cellulose is finally removed from the sinkcells through active transport.
