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Stomatal guard cells are unique as a plant cell model and, because of the depth of knowledge now to hand on ion transport and its regulation, serve as an excellent model for the analysis of stimulus-response coupling in higher plants. Parallel controls – mediated by Ca 2+ , H + protein kinases and phosphatases — regulate the gating of the K + and Cl − channels that...
Transport of K + in higher plants, as in bacteria and fungi, is mediated by two broad classes of transport proteins that operate in the millimolar and micromolar K + concentration ranges. A search of the Expressed Sequence Tag database using amino acid consensus sequences for the K + transporters HAK1 from Schwanniomyces and Kup of Escherichia coli yielded two homologous sequences...
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