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Stomata are less responsive to environmental stimuli in high background ozone in Dactylis glomerata and Ranunculus acris

Wagg, Serena; Mills, Gina; Hayes, Felicity; Wilkinson, Sally; Davies, William J.. 2013 Stomata are less responsive to environmental stimuli in high background ozone in Dactylis glomerata and Ranunculus acris. Environmental Pollution, 175. 82-91. 10.1016/j.envpol.2012.11.027

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Abstract/Summary

Two mesotrophic grassland species, Ranunculus acris and Dactylis glomerata were exposed to a range of ozone treatments (16.2 to 89.5 ppb) and two watering regimes under naturally fluctuating photosynthetically active radiation (PAR), vapour pressure deficit (VPD) and temperature. Stomatal conductance was measured throughout the experiments, and the combined data set (>1000 measurements) was analysed for effects of low and high ozone on responses to environmental stimuli. We show that when D. glomerata and R.acris were grown in high background ozone the stomata consistently lose the ability to respond, or have reduced response, to PAR, VPD, temperature, and soil moisture content in comparison to their response in low background ozone. The maximum stomatal conductance (gmax) was also significantly higher in the high background treatment for D. glomerata. We discuss the hypotheses for the reduced sensitivity of stomatal closure to a changing environment and the associated implications for ozone flux modelling.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.envpol.2012.11.027
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry
CEH Sections: Emmett
ISSN: 0269-7491
Additional Keywords: elevated ozone, environmental stimuli, gmax, grassland species, stomatal conductance
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Biology and Microbiology
Botany
Date made live: 18 Mar 2014 15:32 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/505820

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