AtALMT12 represents an R-type anion channel required for stomatal movement in Arabidopsis guard cells

The Plant Journal : for Cell and Molecular Biology
Stefan MeyerRainer Hedrich

Abstract

Stomatal pores formed by a pair of guard cells in the leaf epidermis control gas exchange and transpirational water loss. Stomatal closure is mediated by the release of potassium and anions from guard cells. Anion efflux from guard cells involves slow (S-type) and rapid (R-type) anion channels. Recently the SLAC1 gene has been shown to encode the slow, voltage-independent anion channel component in guard cells. In contrast, the R-type channel still awaits identification. Here, we show that AtALMT12, a member of the aluminum activated malate transporter family in Arabidopsis, represents a guard cell R-type anion channel. AtALMT12 is highly expressed in guard cells and is targeted to the plasma membrane. Plants lacking AtALMT12 are impaired in dark- and CO₂ -induced stomatal closure, as well as in response to the drought-stress hormone abscisic acid. Patch-clamp studies on guard cell protoplasts isolated from atalmt12 mutants revealed reduced R-type currents compared with wild-type plants when malate is present in the bath media. Following expression of AtALMT12 in Xenopus oocytes, voltage-dependent anion currents reminiscent to R-type channels could be activated. In line with the features of the R-type channel, the activity of h...Continue Reading

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Citations

May 9, 2013·Nature Communications·Alexis De AngeliEnrico Martinoia
Sep 8, 2011·Proceedings of the National Academy of Sciences of the United States of America·María Escalante-PérezRainer Hedrich
Mar 22, 2012·Omics : a Journal of Integrative Biology·Muhammad SaeedZhang Tianzhen
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Oct 1, 2011·The FEBS Journal·Hannes KollistSébastien Thomine

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