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Interaction of Pathogenicity Genes in Puccinia graminis f. sp. tritici and ReactionGenes in Triticum aestivum ssp. vulgare ‘Marquis’ and ‘Reliance’¹

We determined pathogenicity of the parental, F₁ and 103 F₂ cultures from a cross between cultures 111-55A (race 111) and 36-55A (race 36) of Puccinia graminis f. sp. tritici on wheat varieties Reliance, Marquis, and Little Club, and lines homozygous for single genes for resistance derived from Little Club x Reliance and Little Club x Marquis. All cultures were highly virulent on Little Club. Parental cultures 111-55A and 36-55A were avirulent and virulent, respectively, on Reliance, Marquis, and the monogenic lines. Pathogenicity on Reliance was conditioned by three gene pairs and on Marquis by two. Pathogenicity was monogenically inherited on three lines, each homozygous for a different gene for resistance derived from Reliance, and on two lines, each homozygous for a different gene for resistance derived from Marquis. A third line, homozygous for a single gene for resistance derived from Marquis, was resistant to culture 111-SS2 used to select the line, but susceptible to cultures 111-55A, 36-55A, and the f₁ and F₂ from 111-55A x 36-55A. The results indicated a 1 to 1 relation between pathogenicity genes in the parasite and reaction genes in the host. Phenotypes resulting from highly specific gene-for-gene interactions were sometimes modified slightly by other pathogenicity genes in the parasite and/or reaction genes in the host.

² Geneticist and Plant Pathologist, Crops Research Division, ARS, USDA, Fargo, N.D., and former Rockefeller Foundation Fellow, North Dakota State University (now Assistant Professor, Departamento de Fitotecnia, Universidad Agraria, "La Molina", Lima, Peru).

Received for publication September 20, 1965.