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Inheritance of Resistance to Stem Rust in a Selection of the Wheat Cultivar ‘Waldron’¹

The hard red spring wheat (Triticum aestivum L.) cultivar ‘Waldron’ is resistant to North American strains of stem rust (Puccinia graminis f. sp. tritici). The inheritance of resistance in a selection of Waldron (Wdr-sel) was studied to determine the number of genes affecting reaction to 15 cultures of the stem rust fungus. F₂ plants from Wdr-sell/‘Little Club’ were progeny tested by inoculating families of F₃ seedlings. Infection types were used to classify each F₂ family into homozygous susceptible (S), segregating resistant and susceptible seedlings in a monogenic ratio (Seg), and inseparable (I). Segregation ratios were tested by chi-square for goodness of fit to ratios of 4ⁿ-2n-1 (1):2n(Seg):l(S), where n is the number of segregating genes for resistance. Wdr-sel had one gene for reaction to culture A-14NW (race 29, HNH) and two genes for reaction to cultures 72-14-5 (race 11-32-113, RPQ), 72-41spl (race 15B, TLM), WM-1 (race 18, LBC), Gb121 (race 121, DCM), 370c (race 151, QFL), Or9e (race 9, JBC), Orllc (race 151, QBC), 41-21spl (race 15, TBC), 72.00 (race 11-32-113, RTQ), A-1 (race 151, QSH), A-5 (race 156, MBC; one F₁ family), and 75-86spl (race 151, QSH; one F₁ family). One F₁ family gave trigenic segregations with cultures WM-1, Or9e, Orllc, 41-21sp1, and A-5. Data for reactions to culture A-15 (race 17, HNQ) were a poor fit to a digenic ratio and were inconclusive; however, the data were a better fit to a digenic ratio than to a monogenic or trigenic ratio. Wdr-sel had four genes for resistance to culture 111-SS2 (race 111, LCB).

Paired comparisons of reactions to the different cultures were inconclusive but were consistent with the hypothesis that the gene for resistance to culture A-14NW also conditioned resistance to the other cultures, and that the same two genes conditioned resistance to 13 of the cultures.

Key Words: Triticum aestivum L • Puccinia graminis f. sp. tritici Eriks. & E. Henn • Host-pathogen relationships • Disease resistance

² Research geneticist and research plant pathologist, USDA-ARS, North Dakota State Univ., Fargo, ND 58105

Received for publication March 15, 1982.