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Published in Crop Sci 22:992-995 (1982)
© 1982 Crop Science Society of America
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Quantitative Inheritance of Ozone Resistance in Potato1

N. E. De Vos, R. R. Hill, Jr., E. J. Pell and R. H. Cole2

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

1 Contribution of the Pennsylvania State Univ. Authorized for publication as Journal Series No. 6310 by the Pennsylvania Agric. Exp. Stn., University Park, PA 16802. Research supported in part by Regional Research Project NE121.

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.




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Copyright © 1982 by the Crop Science Society of America.