Abstract
Soybean [ Glycine max (L.) Merr.] cultivars Essex and Forrest that exhibit differences in ozone (O 3) sensitivity were used in greenhouse experiments to investigate the role of leaf extracellular antioxidants in O 3 injury responses. Charcoal-filtered air and elevated O 3 conditions were used to assess genetic, leaf age, and O 3 effects. In both cultivars, the extracellular ascorbate pool consisted of 80–98% dehydroascorbic acid, the oxidized form of ascorbic acid (AA) that is not an antioxidant. For all combinations of genotype and O 3 treatments, extracellular AA levels were low (1–30 nmol g −1 FW) and represented 3–30% of the total antioxidant capacity. Total extracellular antioxidant capacity was twofold greater in Essex compared with Forrest, consistent with greater O 3 tolerance of Essex. The results suggest that extracellular antioxidant metabolites in addition to ascorbate contribute to detoxification of O 3 in soybean leaves and possibly affect plant sensitivity to O 3 injury.
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