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Quantitative Inheritance of Ozone Resistance in Potato¹

The inheritance of foliar resistance to ozone was studied in 14 cultivars of Solanum tuberosum L. using two sets of 7 x 7 diallel crosses. Resistant, intermediate, and susceptible parents were included in each diallel. In each of four runs for each diallel, parent clones, parents selfed, and reciprocal F₁ hybrids were simultaneously exposed to 774(µg/m³ (0.40 ppm) ozone for 3 hours in a controlled environment chamber at 21 C and 70% relative humidity.

General and specific combining ability were significant in both diallels, accounting for over 70 and 20%, respectively, of the variation among hybrids. Maternal effects were significant in one diallel, but accounted for less than 5 % of the variation among hybrids in either set of crosses. Single-locus, autotetraploid genetic models for complete additivity, complete dominance for suceptibility, and complete dominance for resistance were tested by comparing the observed and expected relationships between parent, S₁, and offspring means. Complete dominance for resistance accounted for the results better than any of the simple models tested; however, no adequate test for digenic and trigenic models could be determined, and no model with more than one locus or multiple alleles was examined.

Key Words: Air pollution • Diallel analysis • Disease resistance • Genetics • Solanum tuberosum

² Former graduate assistant, Dep. of Horticulture (present address: U.S. Agric. Res. Stn., P. O. Box 5098, Salinas, CA 93915); research agronomist, USDA-ARS, U. S. Regional Pasture Res. Lab,; associate professor, Dep. of Plant Pathology and Center for Air Environment Studies; and associate professor, Dep. of Horticulture, respectively.

Received for publication October 7, 1981.