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Estimations of apoplastic concentrations of K+ and Ca2+ in the vicinity of stomatal guard cells.

de Silva, D. L. R. and Honour, Sarah J. and Mansfield, T. A. (1996) Estimations of apoplastic concentrations of K+ and Ca2+ in the vicinity of stomatal guard cells. New Phytologist, 134 (3). pp. 463-469. ISSN 1469-8137

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Abstract

A method which determines the null point for stomatal aperture has been used to estimate the apoplastic concentrations of potassium and calcium adjacent to the stomatal guard cells of Commelina communis. These two ions are contributors to important aspects of stomatal physiology: the determination of guard cell turgor (K+) and intracellular signalling (Ca2+) when the guard cells respond to the various stimuli that effect changes in stomatal aperture. We obtained estimates of apoplastic K+ concentrations in the range of 50–75 mol m-3, which are in general agreement with those of Bowling (1987). Ca2+ concentrations appear to be in the region of 0·05 mol m-3 adjacent to the guard cells even though much higher concentrations (up to 4 mol m-3) may be delivered to the leaf in the xylem sap. Thus it is suggested that the gradient in apoplastic Ca2+ may be very large over short distances, and may be strictly controlled by cells within the epidermis.

Item Type: Article
Journal or Publication Title: New Phytologist
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Health and Medicine > Medicine
Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22169
Deposited By: ep_ss_importer
Deposited On: 13 Feb 2009 13:30
Refereed?: No
Published?: Published
Last Modified: 26 Jul 2012 15:57
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22169

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