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

Détails

ID Serval
serval:BIB_4666D3B65730
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Guard cell-specific calcium sensitivity of high density and activity SV/TPC1 channels.
Périodique
Plant and Cell Physiology
Auteur(s)
Rienmüller F., Beyhl D., Lautner S., Fromm J., Al-Rasheid K.A., Ache P., Farmer E.E., Marten I., Hedrich R.
ISSN
1471-9053 (Electronic)
ISSN-L
0032-0781
Statut éditorial
Publié
Date de publication
2010
Volume
51
Numéro
9
Pages
1548-1554
Langue
anglais
Résumé
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.
Mots-clé
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
Pubmed
Web of science
Open Access
Oui
Création de la notice
18/01/2011 15:39
Dernière modification de la notice
08/05/2019 17:57
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