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Carbon dioxide induces increases in guard cell cytosolic free calcium.

Webb, Alex A. R. and McAinsh, Martin R. and Mansfield, Terry A. and Hetherington, Alistair M. (1996) Carbon dioxide induces increases in guard cell cytosolic free calcium. The Plant Journal, 9 (3). pp. 297-304.

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Abstract

The hypothesis that increases in cytosolic free calcium ([Ca2+]i) are a component of the CO2 signal transduction pathway in stomatal guard cells of Commelina communis has been investigated. This hypothesis was tested using fura-2 fluorescence ratio photometry to measure changes in guard cell [Ca2+]i in response to challenge with 700 µl l−1 CO2. Elevated CO2 induced increases in guard cell [Ca2+]i which were similar to those previously reported in response to abscisic acid. [Ca2+]i returned to resting values following removal of the CO2 and further application of CO2 resulted in a second increase in [Ca2+]i. This demonstrated that the CO2-induced increases in [Ca2+]i were stimulus dependent. Removal of extracellular calcium both prevented the CO2-induced increase in [Ca2+]i and inhibited the associated reduction in stomatal aperture. These data suggest that Ca2+ acts as a second messenger in the CO2 signal transduction pathway and that an increase in [Ca2+]i may be a requirement for the stomatal response to CO2.

Item Type: Article
Journal or Publication Title: The Plant Journal
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
Faculty of Science and Technology > Engineering
ID Code: 22191
Deposited By: ep_ss_importer
Deposited On: 12 Feb 2009 14:34
Refereed?: No
Published?: Published
Last Modified: 26 Jul 2012 15:57
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22191

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