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Ecology and Epidemiology

Soybean Cultivar Hodgson Response to Ozone. Gregory C. Pratt, Research fellow, Department of Plant Pathology, University of Minnesota, St. Paul 55108; Sagar V. Krupa, associate professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Phytopathology 71:1129-1132. Accepted for publication 27 February 1981. Copyright 1981 The American Phytopathological Society. DOI: 10.1094/Phyto-71-1129.

Acute response (visible injury) of soybean unifoliolate and first trifoliolate leaves to ozone conformed well to a log-probability model with pollutant concentration and exposure time as the independent variables. Reduction in leaf chlorophyll concentration was correlated with visible injury. Reduction in chlorophyll concentration was also observed in leaves fumigated with low concentrations of ozone (0.080.10 μL[μl/L = ppm]) for 2 hr/day for 5 consecutive days.