Minguet-Parramona, Carla and Wang, Yizhou and Hills, Adrian and Vialet-Chabrand, Silvere and Griffiths, Howard and Rogers, Simon and Lawson, Tracy and Lew, Virgilio L and Blatt, Michael R (2016) An Optimal Frequency in Ca<sup>2+</sup> Oscillations for Stomatal Closure Is an Emergent Property of Ion Transport in Guard Cells. Plant Physiology, 170 (1). pp. 33-42. DOI https://doi.org/10.1104/pp.15.01607
Minguet-Parramona, Carla and Wang, Yizhou and Hills, Adrian and Vialet-Chabrand, Silvere and Griffiths, Howard and Rogers, Simon and Lawson, Tracy and Lew, Virgilio L and Blatt, Michael R (2016) An Optimal Frequency in Ca<sup>2+</sup> Oscillations for Stomatal Closure Is an Emergent Property of Ion Transport in Guard Cells. Plant Physiology, 170 (1). pp. 33-42. DOI https://doi.org/10.1104/pp.15.01607
Minguet-Parramona, Carla and Wang, Yizhou and Hills, Adrian and Vialet-Chabrand, Silvere and Griffiths, Howard and Rogers, Simon and Lawson, Tracy and Lew, Virgilio L and Blatt, Michael R (2016) An Optimal Frequency in Ca<sup>2+</sup> Oscillations for Stomatal Closure Is an Emergent Property of Ion Transport in Guard Cells. Plant Physiology, 170 (1). pp. 33-42. DOI https://doi.org/10.1104/pp.15.01607
Abstract
Oscillations in cytosolic-free Ca2+ concentration ([Ca2+]i) have been proposed to encode information that controls stomatal closure. [Ca2+]i oscillations with a period near 10 min were previously shown to be optimal for stomatal closure in Arabidopsis (Arabidopsis thaliana), but the studies offered no insight into their origins or mechanisms of encoding to validate a role in signaling. We have used a proven systems modeling platform to investigate these [Ca2+]i oscillations and analyze their origins in guard cell homeostasis and membrane transport. The model faithfully reproduced differences in stomatal closure as a function of oscillation frequency with an optimum period near 10 min under standard conditions. Analysis showed that this optimum was one of a range of frequencies that accelerated closure, each arising from a balance of transport and the prevailing ion gradients across the plasma membrane and tonoplast. These interactions emerge from the experimentally derived kinetics encoded in the model for each of the relevant transporters, without the need of any additional signaling component. The resulting frequencies are of sufficient duration to permit substantial changes in [Ca2+]i and, with the accompanying oscillations in voltage, drive the K+ and anion efflux for stomatal closure. Thus, the frequency optima arise from emergent interactions of transport across the membrane system of the guard cell. Rather than encoding information for ion flux, these oscillations are a by-product of the transport activities that determine stomatal aperture.
Item Type: | Article |
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Uncontrolled Keywords: | Cell Membrane; Cytosol; Arabidopsis; Arabidopsis Proteins; Calcium Signaling; Biological Transport; Models, Biological; Adenosine Triphosphatases; Plant Stomata; Plant Cells |
Subjects: | Q Science > QH Natural history > QH301 Biology |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 19 Nov 2016 12:24 |
Last Modified: | 30 Oct 2024 20:03 |
URI: | http://repository.essex.ac.uk/id/eprint/18088 |