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Leaf extracellular ascorbate in relation to O3 tolerance of two soybean cultivars
- Abstract::
- Soybean [Glycine max (L.) Merr.] cultivars Essex and Forrest that exhibit differences in ozone (O3) sensitivity were used in greenhouse experiments to investigate the role of leaf extracellular antioxidants in O3 injury responses. Charcoal-filtered air and elevated O3 conditions were used to assess genetic, leaf age, and O3 effects. In both cultivars, the extracellular ascorbate pool consisted of 80e98% dehydroascorbic acid, the oxidized form of ascorbic acid (AA) that is not an antioxidant. For all combinations of genotype and O3 treatments, extracellular AA levels were low (1e30 nmol g 1 FW) and represented 3e30% of the total antioxidant capacity. Total extracellular antioxidant capacity was twofold greater in Essex compared with Forrest, consistent with greater O3 tolerance of Essex. The results suggest that extracellular antioxidant metabolites in addition to ascorbate contribute to detoxification of O3 in soybean leaves and possibly affect plant sensitivity to O3 injury.
- Author(s):
-
Cheng, F.Y. , Burkey, K.O. , Robinson, J.M. , Booker, F.L.
- Subject(s):
-
leaves , ascorbic acid , ozone , cultivars , Glycine max , soybeans , greenhouse experimentation , antioxidants , extracellular matrix , plant damage , plant stress , elevated atmospheric gases , charcoal , air , dehydroascorbic acid , oxidation , genotype , antioxidant activity , stress tolerance , metabolites , species differences
- Description:
- Includes references
- Source:
- Environmental pollution 2007 Dec., v. 150, issue 3
- Language:
- English
- Year:
- 2007
- Collection:
-
Journal Articles, USDA Authors, Peer-Reviewed
- File:
-
Download [PDF]
- Rights:
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
