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

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Date

2010

Type de document
Périmètre
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Serveur académique Lausannois

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Ce document est lié à :
info:eu-repo/semantics/altIdentifier/doi/10.1093/pcp/pcq102

Ce document est lié à :
info:eu-repo/semantics/altIdentifier/pmid/20630987

Ce document est lié à :
info:eu-repo/semantics/altIdentifier/eissn/1471-9053

Ce document est lié à :
info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_4666D3B657307

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Serveur Académique Lausannois

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Université de Lausanne et CHUV

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info:eu-repo/semantics/openAccess , Copying allowed only for non-profit organizations , https://serval.unil.ch/disclaimer

Mots-clés 0

Arabidopsis/genetics; Arabidopsis/metabolism; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Calcium/metabolism; Calcium Channels/genetics; Calcium Channels/metabolism; Electrophysiological Processes; Mesophyll Cells/metabolism; Mutation; Patch-Clamp Techniques; Plant Leaves/chemistry; Plant Stomata/metabolism; Potassium/analysis; Sodium/analysis; Stress, Physiological; Vacuoles/metabolism

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F. Rienmüller et al., « Guard cell-specific calcium sensitivity of high density and activity SV/TPC1 channels. », Serveur académique Lausannois, ID : 10.1093/pcp/pcq102

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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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