Abstract
Ion channels are key participants in physiological processes of plant cells. Here, we report the first characterization of a high conductance, Cl −-permeable channel, present in enriched fractions of plasma membranes of bean root cells. The Cl − channel was incorporated into planar lipid bilayers and its activity was recorded under voltage clamp conditions. The channel is voltage-dependent, excludes the passage of cations (K +, Na +, and Ca 2+), and is inhibited by micromolar concentrations of Zn 2+. The Cl − conductance here characterized represents a previously undescribed channel of plant cells.
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