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Additional Genes for Resistance to Pseudomonas solanacearum in Solanum phureja. P. R. Rowe, Geneticist, Plant Science Research Division, ARS, USDA, Madison, Wisconsin; L. Sequeira(2), and L. C. Gonzalez(3). (2)Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706; (3)Postdoctorate Fellow, Department of Plant Pathology, University of Wisconsin, Madison 53706. Phytopathology 62:1093-1094. DOI: 10.1094/Phyto-62-1093.

Certain clones of Solanum phureja have high levels of resistance to Pseudomonas solanacearum in growth chamber tests. Ten hybrid families were tested under growth chamber conditions by inoculation with a race 1 isolate of P. solanacearum (S-123). The genetic hypothesis that best fits the observed resistant-susceptible ratios requires that three dominant and independent genes provide resistance. One of these genes is required to give resistance to another race 1 isolate, K-60. Resistance apparently is controlled by relatively few genes in a system that is partially interrelated yet specific for certain strains of the bacterium.

Additional keywords: potato, disease resistance.