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Phosphorus; Soybean


Transport patterns of phosphorus-32 from the cotyledons, primary leaves and the first five trifoliate leaves of soybean were determined at various ages of these organs. The transport patterns studied indicate the same general pattern for each leaf. There is initially a bidirectional movement from the leaf that increases in its upward component as the leaf becomes older, followed by a sharp drop in the upward component and P'" transport becoming essentially unidirectional downward in the stem. At fruit development, phosphorus-32 transport becomes quite specific for fruit at the axil of a particular leaf. Contiguity to sites of high metabolic activity seems to determine direction of phosphorus-32 transport.

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