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Journal of Experimental Botany, Vol 50, 873-876, Copyright © 1999 by Oxford University Press

ARTICLES

Short communication. Selectivity of the fast activating vacuolar cation channel

L Bruggemann, I Pottosin and G Schonknecht
Molecular Plant Physiology and Biophysics, Botany I, University of Wurzburg Julius-von-Sachs-Platz 2, D-97082 Wurzburg, Germany; Biomedical Centre, University of Colima, 28047 Colima, Col., Mexico; Corresponding author; Fax: +49 931 888 6158; E-mail: gerald@botanik.uni-wuerzburg.de

The FV channel dominates the ion conductance of the vacuolar membrane at physiological Ca2+ concentrations. Patch-clamp measurements on whole barley (Hordeum vulgare) mesophyll vacuoles and on excised tonoplast patches showed small differences in a selectivity sequence NH4+ > K+ Rb+ Cs+ >Na+ >Li+. Less permeant cations decreased the open probability. The FV channel allows the uptake of small monovalent cations especially NH4+ into the vacuole.Keywords: Hordeum vulgare, patch-clamp, vacuolar membrane, cation channel, selectivity.
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