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Enhanced ozone‐tolerance in wheat grown at an elevated CO 2 concentration: ozone exclusion and detoxification
Author(s) -
MCKEE I. F.,
EIBLMEIER M.,
POLLE A.
Publication year - 1997
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.1997.00801.x
Subject(s) - catalase , ozone , photorespiration , photosynthesis , superoxide dismutase , chemistry , antioxidant , glutathione , detoxification (alternative medicine) , horticulture , botany , zoology , biology , biochemistry , enzyme , medicine , alternative medicine , organic chemistry , pathology
summary Elevated [CO 2 ] has been shown to protect photosynthesis and growth of wheat against moderately elevated [O 3 ]. To investigate the role of ozone exclusion and detoxification in this protection, spring wheat ( Triticum aestivum L. ev. Wembley) was grown from seed, in controlled‐environment chambers, under reciprocal combinations of [CO 2 ] at 350 or 700 μmol mol −1 and [O 3 ] 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 [CO 2 ] and/or [O 3 ]. Superoxide dismutase activity was not significantly affected by either condition. Neither ascorbate nor glutathione content was enhanced by elevated [CO 2 ]. In wheat, at moderately elevated [O 3 ], our results show that stomatal exclusion plays a major role in the protective effect of elevated [CO 2 ] against O 3 damage.