K+ transport properties of K+ channels in the plasma membrane of Vicia faba guard cells.
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چکیده
منابع مشابه
K+ transport properties of K+ channels in the plasma membrane of Vicia faba guard cells
Electrical properties of the plasma membrane of guard cell protoplasts isolated from stomates of Vicia faba leaves were studied by application of the whole-cell configuration of the patch-clamp technique. The two types of K+ currents that have recently been identified in guard cells may allow efflux of K+ during stomatal closing, and uptake of K+ during stomatal opening (Schroeder et al., 1987)...
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The dominant outward rectifier K+ currents were examined in protoplasts from Vicia faba guard cells. In whole-cell patch-clamp recordings, we generally observed that the conductance of the K+ inward and the outward rectifier gradually decreases. As a consequence of this run down a new steady state was achieved which was 90 ± 5% lower than that obtained at the beginning of the recording. The run...
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Previous studies reveal that the pH of the apoplastic solution in the guard cell walls may vary between 7.2 and 5.1 in closed and open stomata, respectively. During these aperture and pH changes, massive K+ fluxes cross the cellular plasma membrane driving the osmotic turgor and volume changes of guard cells. Therefore, we examined the effect of extracellular pH on the depolarization-activated ...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1988
ISSN: 0022-1295,1540-7748
DOI: 10.1085/jgp.92.5.667