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Two voltage-dependent calcium channels co-exist in the apical plasma membrane ofArabidopsis thalianaroot hairs

Miedema, Henk and Demidchik, Vadim and Véry, Anne-Aliénor and Bothwell, John H F and Brownlee, Colin and Davies, Julia M (2008) 'Two voltage-dependent calcium channels co-exist in the apical plasma membrane ofArabidopsis thalianaroot hairs.' New Phytologist, 179 (2). pp. 378-385. ISSN 0028646X

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Abstract

Calcium (Ca2+)-permeable plasma membrane ion channels are critical to root hair elongation and signalling. Arabidopsis thaliana root hair plasma membrane contains a hyperpolarization-activated Ca2+ channel (HACC) conductance. Here, the co-residence of HACC with a depolarization-activated Ca2+ channel (DACC) conductance has been investigated. Whole-cell patch-clamping of apical plasma membrane has been used to study Ca2+ conductances and reveal the negative slope conductance typical of DACCs. Specific voltage protocols, Ba2+-permeation and inhibition by the cation channel blocker Gd3+ have been used to identify the DACC conductance. The Gd3+ sensitive DACC conductance was identified in only a minority of cells. DACC activity was quickly masked by the development of the HACC conductance. However, in the period between the disappearance of the negative slope conductance and the predominance of HACC, DACC activity could still be detected. A DACC conductance coexists with HACC in the root hair apical plasma membrane and could provide Ca2+ influx over a wide voltage range, consistent with a role in signalling.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Biological Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 11 Oct 2011 10:19
Last Modified: 11 Oct 2011 10:19
URI: http://repository.essex.ac.uk/id/eprint/1058

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