The Import and Redistribution of Several Cations and Anions in Tomato Leaves |
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Authors: | WOLTERBEEK, H. TH. BRUIN, M. DE |
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Abstract: | Wolterbeek, H. Th. and De Bruin, M. 1986. The import and redistributionof several cations and anions in tomato leaves.J. exp.Bot. 37: 331340. The upward movements in the xylem and redistribution from theleaf of Na+ , K+ , Rb+, Cs+ and four anions were examined insub-systems of tomato plants (Lycopersicon esculentum, Mill.cv. Tiny Tim). There was a delay with respect to the redistributionof newly imported elements from the source leaf of about 1620h for all four alkali ions. This is considerably less than theapparent delay for the anions Sb(SO4) WO42 Mo7O246and AsO43 The prolonged delay for the anions is suggestedto be a consequence of metabolic transformation in the leaf.Reduction of the source-sink activity ratio did not decreasethe delay period from the source leaf, but apparently causedincreased Na+ transfer from the xylem. It is concluded thatthe application of a detailed mathematical descnption of upwardelement movement has considerable potential possibilities forunderstanding circulation of nutrients in the plant. Key words: Alkali ions, anions, xylem, phloem, redistribution, tomato |
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