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<table border="0" width="450"><tbody><tr style="border-top:1pt dotted #C0C0C0;border-bottom:1pt dotted #C0C0C0;padding-bottom:.1in;padding-top:.1in;"><td><a href="http://www.biology-online.org/js/tiny_mce/plugins/imagemanager/files/boa002/mcg191f1.gif"><img src="/js/tiny_mce/plugins/imagemanager/files/boa002/mcith/mcith_mcg191f1.gif" alt="mcith_mcg191f1.gif"></a> </td> <td style="padding-left:.1in;"><span style="font-size:xx-small;font-family:Arial;"></span><p> <strong>Fig. 1.</strong> Diversity of K<sup>+</sup> transport mechanisms at the plasma membrane of a ‘generalized’ leaf cell. Four different types of K<sup>+</sup>-selective channels [inward- (KIR) and outward- (KOR) rectifying, stretch-activated (SAS) and weakly voltage-dependent (WDKC) channels], one non-selective cation channel (NSCC) and two K<sup>+</sup> transporters (HKT and HUK) are shown. Their gating properties are shown in the figure inset (a tick denotes activation/deactivation by an external or internal factor; a question mark means the gating properties are not known). MP, membrane potential; CN, cyclic nucleotides; Pol, polyamines; ROS, reactive oxygen species. </p> <p> (Click image to enlarge) </p> </td> </tr><tr style="border-top:1pt dotted #C0C0C0;border-bottom:1pt dotted #C0C0C0;padding-bottom:.1in;padding-top:.1in;"><td><a href="http://www.biology-online.org/js/tiny_mce/plugins/imagemanager/files/boa002/mcg191f2.gif"><img src="/js/tiny_mce/plugins/imagemanager/files/boa002/mcith/mcith_mcg191f2.gif" alt="mcith_mcg191f2.gif"></a> </td> <td style="padding-left:.1in;"><span style="font-size:xx-small;font-family:Arial;"></span><p> <strong>Fig. 2.</strong> Potassium transport mechanisms at plant tonoplast. Five types of K<sup>+</sup>-permeable channels [slow (SV)- and fast (FV)-activated non-selective channels; K<sup>+</sup>-selective (VK) channel; K<sup>+</sup> outward rectifiers (KCO); and stretch-activated (SAS) K<sup>+</sup> channels] are shown. In addition, at least two transporters (HUK and NHX) may also contribute to K<sup>+</sup> transfer across the tonoplast. </p> <p> (Click image to enlarge) </p> </td> </tr></tbody></table><p> </p>
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