The Import and Redistribution of Several Cations and Anions in Tomato Leaves

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Abstract
Wolterbeek, H. Th. and De Bruin, M. 1986. The import and redistribution of several cations and anions in tomato leaves.—J. exp. Bot. 37: 331–340. The upward movements in the xylem and redistribution from the leaf of Na+ , K+ , Rb+, Cs+ and four anions were examined in sub-systems of tomato plants (Lycopersicon esculentum, Mill. cv. Tiny Tim). There was a delay with respect to the redistribution of newly imported elements from the source leaf of about 16–20 h for all four alkali ions. This is considerably less than the apparent delay for the anions Sb(SO4)− WO42− Mo7O246− and AsO43− The prolonged delay for the anions is suggested to be a consequence of metabolic transformation in the leaf. Reduction of the source-sink activity ratio did not decrease the delay period from the source leaf, but apparently caused increased Na+ transfer from the xylem. It is concluded that the application of a detailed mathematical descnption of upward element movement has considerable potential possibilities for understanding circulation of nutrients in the plant.