Ionic channels of the vacuolar membrane of higher plants |
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Authors: | Tikhonova L I |
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Institution: | Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, Russia. luba@botanik.uni-wuerzburg-de |
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Abstract: | The vacuole is the major storing compartment of the plant cell. There are two different H(+)-translocating pumps generating transmembrane pH gradients and several types of calcium, anion and potassium channels. The fast-activating vacuolar (FV) current dominates at the physiological level of cytoplasmic Ca2+. An increase in the cytoplasmic Ca2+ concentration causes a decrease in the activity of FV channels and a shift of the membrane potential to more negative values. In this case voltage-dependent Ca2+ channels capable of mediating the vacuolar Ca2+ release can be activated. Moreover, an increase in the cytoplasmic Ca2+ concentration activated vacuolar K+ channels described in the vacuolar membrane of stomatal guard cells. A role of slow-activating channels in the Ca(2+)-induced Ca2+ release is rather improbable. |
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