Elevated CO2-induced responses in stomata require ABA and ABA signaling

Chater, C., Peng, K., Movahedi, M., Dunn, J., Walker, H., Yun-Kuan, L., McLachlan, D., Casson, S., Isner, J., Wilson, I. D., Neill, S., Hedrich, R., Gray, J. and Hetherington, A. (2015) Elevated CO2-induced responses in stomata require ABA and ABA signaling. Current Biology, 25 (20). pp. 2709-2716. ISSN 0960-9822 Available from: http://eprints.uwe.ac.uk/27616

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Publisher's URL: http://dx.doi.org/10.1016/j.cub.2015.09.013


An integral part of global environment change is an increase in the atmospheric concentration of CO2 ([CO2]) [1]. Increased [CO2] reduces leaf stomatal apertures and density of stomata that plays out as reductions in evapotranspiration [2, 3 and 4]. Surprisingly, given the importance of transpiration to the control of terrestrial water fluxes [5] and plant nutrient acquisition [6], we know comparatively little about the molecular components involved in the intracellular signaling pathways by which [CO2] controls stomatal development and function [7]. Here, we report that elevated [CO2]-induced closure and reductions in stomatal density require the generation of reactive oxygen species (ROS), thereby adding a new common element to these signaling pathways. We also show that the PYR/RCAR family of ABA receptors [8 and 9] and ABA itself are required in both responses. Using genetic approaches, we show that ABA in guard cells or their precursors is sufficient to mediate the [CO2]-induced stomatal density response. Taken together, our results suggest that stomatal responses to increased [CO2] operate through the intermediacy of ABA. In the case of [CO2]-induced reductions in stomatal aperture, this occurs by accessing the guard cell ABA signaling pathway. In both [CO2]-mediated responses, our data are consistent with a mechanism in which ABA increases the sensitivity of the system to [CO2] but could also be explained by requirement for a CO2-induced increase in ABA biosynthesis specifically in the guard cell lineage. Furthermore, the dependency of stomatal [CO2] signaling on ABA suggests that the ABA pathway is, in evolutionary terms, likely to be ancestral.

Item Type:Article
Uncontrolled Keywords:CO2, stomata, ABA signalling
Faculty/Department:Faculty of Health and Applied Sciences > Department of Applied Sciences
ID Code:27616
Deposited By: Dr I. Wilson
Deposited On:02 Dec 2015 08:58
Last Modified:25 Jul 2017 05:15

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