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Enhanced ozone-tolerance in wheat grown at an elevated CO2 concentration: ozone exclusion and detoxification

Published online by Cambridge University Press:  01 October 1997

I. F. MCKEE
Affiliation:
Department of Biological Sciences, John Tabor Laboratories, University of Essex, Wivenhoe Park, Colchester, Essex, CO4 3SQ, UK
M. EIBLMEIER
Affiliation:
Institut für Forstbotanik und Baumphysiologie, Albert-Ludwigs-Universität Freiburg, Am Flughafen 17, D-79085, Freiburg, Germany
A. POLLE
Affiliation:
Institut für Forstbotanik, Georg-August-Universität Göttingen, Büsgenweg 2, 37077 Göttingen, Germany
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Abstract

Elevated [CO2] has been shown to protect photosynthesis and growth of wheat against moderately elevated [O3]. To investigate the role of ozone exclusion and detoxification in this protection, spring wheat (Triticum aestivum L. cv. Wembley) was grown from seed, in controlled-environment chambers, under reciprocal combinations of [CO2] at 350 or 700 μmol mol−1 and [O3] peaking at <5 or 60 nmol mol−1, respectively. Cumulative ozone dose to the mesophyll and antioxidant status were determined throughout flag leaf development. Catalase activity correlated with rates of photorespiration and declined in response to elevated [CO2] and/or [O3]. Superoxide dismutase activity was not significantly affected by either condition. Neither ascorbate nor glutathione content was enhanced by elevated [CO2]. In wheat, at moderately elevated [O3], our results show that stomatal exclusion plays a major role in the protective effect of elevated [CO2] against O3 damage.

Type
Research Article
Copyright
© Trustees of the New Phytologist 1997

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