Guard cell-specific calcium sensitivity of high density and activity SV/TPC1 channels

Plant & Cell Physiology
Florian RienmüllerRainer Hedrich

Abstract

The slow vacuolar (SV) channel, a Ca2+-regulated vacuolar cation conductance channel, in Arabidopsis thaliana is encoded by the single-copy gene AtTPC1. Although loss-of-function tpc1 mutants were reported to exhibit a stoma phenotype, knowledge about the underlying guard cell-specific features of SV/TPC1 channels is still lacking. Here we demonstrate that TPC1 transcripts and SV current density in guard cells were much more pronounced than in mesophyll cells. Furthermore, the SV channel in motor cells exhibited a higher cytosolic Ca2+ sensitivity than in mesophyll cells. These distinct features of the guard cell SV channel therefore probably account for the published stomatal phenotype of tpc1-2.

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Citations

Oct 30, 2012·Journal of Experimental Botany·Paul Vijay Kanth GutlaArmando Carpaneto
Mar 8, 2011·Cell Calcium·Edgar Peiter
Jul 9, 2011·The Plant Journal : for Cell and Molecular Biology·Christina SchulzePetra Dietrich
Oct 1, 2011·The FEBS Journal·Fabien JammesJune M Kwak
May 8, 2014·The New Phytologist·Hannes KollistM Rob G Roelfsema
Apr 5, 2011·Molecular Plant·Rainer Hedrich, Irene Marten
May 17, 2018·Journal of Experimental Botany·Alex CostaIldiko Szabo
Oct 18, 2012·Physiological Reviews·Rainer Hedrich
Jun 18, 2020·International Journal of Molecular Sciences·Dawid JaślanChristian Grimm
Jan 1, 2018·Functional Plant Biology : FPB·Igor Pottosin, Oxana Dobrovinskaya
Jul 19, 2013·Plant Physiology·Stéphanie M SwarbreckJulia M Davies
Mar 29, 2021·The New Phytologist·Sohail M KarimiRosalia Deeken

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