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Short communication. Selectivity of the fast activating vacuolar cation channel |
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| Authors: | Bruggemann L; Pottosin I; Schonknecht G |
| Institution: | 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 |
| Abstract: | 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. |
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