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Increases in Peroxidase Isoenzyme Activity in Bean Leaves Exposed to Low Doses of Ozone. C. R. Curtis, Assistant Professor, Department of Botany, University of Maryland, College Park 20742; R. K. Howell, Research Plant Pathologist, Plant Science Research Division, ARS, USDA, Beltsville, Maryland 20705. Phytopathology 61:1306-1307. DOI: 10.1094/Phyto-61-1306.

Polyacrylamide gel electrophoresis of Tempo bean leaf proteins, extracted from plants grown in filtered air, revealed that low doses of ozone (20-25 pphm for 90-180 min) increased the activity of many peroxidase isoenzymes. Symptomless leaves previously exposed to ozone showed a similar increase in activity, but not as much as in leaves exhibiting definite symptoms of ozone injury.