Voltage-dependent calcium channels in plant vacuoles

Omar Pantoja, Angela C Gelli, Eduardo Blumwald

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Abstract

Free calcium (Ca2+) in the cytoplasm of plant cells is important for the regulation of many cellular processes and the transduction of stimuli. Control of cytoplasmic Ca2+ involves the activity of pumps, carriers, and possibly ion channels. The patch-clamp technique was used to study Ca2+ channels in the vacuole of sugar beet cells. Vacuolar currents showed inward rectification at negative potentials, with a single-channel conductance of 40 picosiemens and an open probability dependent on potential. Channels were inhibited by verapamil and lanthanum. These channels could participate in the regulation of cytoplasmic Ca2+ by sequestering Ca2+ inside the vacuole.

Original languageEnglish (US)
Pages (from-to)1567-1570
Number of pages4
JournalScience
Volume255
Issue number5051
StatePublished - Mar 20 1992
Externally publishedYes

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Cite this

Pantoja, O., Gelli, A. C., & Blumwald, E. (1992). Voltage-dependent calcium channels in plant vacuoles. Science, 255(5051), 1567-1570.