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EMBO J. 1990 Dec;9(12):3889-92.

Ca2+ and nucleotide dependent regulation of voltage dependent anion channels in the plasma membrane of guard cells.

Author information

1
Pflanzenphysiologisches Institut der Universität, Göttingen, FRG.

Abstract

Using the patch-clamp technique we discovered that the voltage dependent anion channels in the plasma membrane of guard cells are activated by a rise in cytoplasmic Ca2+ in the presence of nucleotides. Upon activation, these anion channels catalyse anion currents 10-20 times higher than in the inactivated state, thus shifting the plasma membrane from a K+ conducting state to an anion conducting state. Prolonged stimulation by depolarizing voltages results in the inactivation of the anion current (t1/2 = 10-12 s). We suggest that activation of the anion channel by Ca2+ and nucleotides is a key event in the regulation of salt efflux from guard cells during stomatal closure.

PMID:
1701140
PMCID:
PMC552158
[Indexed for MEDLINE]
Free PMC Article

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