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Effect of temperature on plasma membrane and tonoplast ion channels in Arabidopsis thaliana

The temperature dependence of the activity of ion channels was investigated, by means of the patch-clamp technique in the «whole-cell» configuration, using protoplasts and vacuoles isolated form Arabidopsis thaliana L. cultured cells. The effect of temperature changes in the range 11-22 o C was tested on the hyperpolarization- and depolarization-activated K + currents in the plasma membrane and on the hyperpolarization-activated K + currents in the tonoplast (vacuolar membrane). All 3 kinds of currents were unaffected by increasing temperature up to 15°C and were activated between 15 and 20 o C