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Ozone suppresses soil drying- and abscisic acid (ABA)-induced stomatal closure via an ethylene-dependent mechanism

Wilkinson, Sally and Davies, William J. (2009) Ozone suppresses soil drying- and abscisic acid (ABA)-induced stomatal closure via an ethylene-dependent mechanism. Plant, Cell and Environment, 32 (8). pp. 949-959. ISSN 0140-7791

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Abstract

Elevated atmospheric ozone concentrations (70 ppb) reduced the sensitivity of stomatal closure to abscisic acid (ABA) in Leontodon hispidus after at least 24 h exposure (1) when detached leaves were fed ABA, and (2) when intact plants were sprayed or injected with ABA. They also reduced the sensitivity of stomatal closure to soil drying around the roots. Such effects could already be occurring under current northern hemisphere peak ambient ozone concentrations. Leaves detached from plants which had been exposed to elevated ozone concentrations generated higher concentrations of ethylene, although leaf tissue ABA concentrations were unaffected. When intact plants were pretreated with the ethylene receptor binding antagonist 1-methylcyclopropene, the stomatal response to both applied ABA and soil drying was fully restored in the presence of elevated ozone. Implications of ethylene's antagonism of the stomatal response to ABA under oxidative stress are discussed. We suggest that this may be one mechanism whereby elevated ozone induces visible injury in sensitive species. We emphasize that drought linked to climate change and tropospheric ozone pollution, are both escalating problems. Ozone will exacerbate the deleterious effects of drought on the many plant species including valuable crops that respond to this pollutant by emitting more ethylene.

Item Type: Article
Journal or Publication Title: Plant, Cell and Environment
Uncontrolled Keywords: abscisic acid (ABA) ; climate change ; drought ; ethylene ; oxidative stress ; ozone pollution ; reactive oxygen species (ROS) ; soil drying ; stomatal guard cells ; transpiration
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 56469
Deposited By: ep_importer_pure
Deposited On: 06 Aug 2012 11:44
Refereed?: Yes
Published?: Published
Last Modified: 07 Sep 2013 01:12
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/56469

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