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Foliar Sensitivity of Soybeans from Early Maturity Groups to Ozone and Inheritance of Injury Response. J. P. Damicone, Department of Plant Pathology, University of Massachusetts, Amherst 01003. W. J. Manning, S. J. Herbert, and W. A. Feder. Department of Plant Pathology, and Department of Plant and Soil Sciences, University of Massachusetts, Amherst 01003, and Suburban Experiment Station, University of Massachusetts, Waltham 02154. Plant Dis. 71:332-336. Accepted for publication 10 November 1986. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0332.

Soybean genotypes of maturity groups 00, 0, and I were evaluated in 1982 and 1983 for foliar sensitivity to ambient ozone (O3). PI 153.283 and PI 153.284 were sensitive to O3, showing 2550% foliar stippling and premature defoliation. Nineteen of the 35 genotypes evaluated for 2 yr were tolerant to O3, showing little or no visible injury. PI 189.907 and PI 153.317 showed no visible injury in the field both years despite frequent O3 episodes in 1983. Crosses were made between two O3-tolerant (PI 189.907 and PI 153.317) and one O3-sensitive (PI 153.283) genotype. Parental, F1, F2, and backcross populations were exposed to 0.30 ppm O3 for 4 hr in a greenhouse fumigation chamber. Injury response distributions were not significantly different within O3-tolerant parents, reciprocal F1 populations, and F2 populations. F1 plants were intermediate in injury response compared with the parents. Injury response distribution in the F2 was nonnormal and exhibited three peaks. Foliar sensitivity to O3 appears to be qualitatively inherited in these genotypes, and a possible genetic model is discussed.