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Inheritance of reaction to loose smut, Ustilago nuda, and to stem rust, Puccinia graminis tritici, in barley



Inheritance of reaction to loose smut, Ustilago nuda, and to stem rust, Puccinia graminis tritici, in barley



Canadian Jour Agric Sci 36(5): 356-370



Inheritance of reaction to 2 races of U. nuda was studied in crosses between the barley vars. Anoidium, Valentine, and Montcalm. Valentine is resistant to 1 race, designated as Vr, and susceptible to the other, designated as Vs. Anodium is resistant and Montcalm susceptible to both races. The resistance of Valentine to race Vr was controlled by a single dominant gene, and the resistance of Anoidium by a single recessive gene. The 2 genes are independent. The recessive gene was designated as un7. The resistance of Anoidium to race Vs was due to a single dominant gene. In crosses with the resistant var. Valentine, mature plant resistance to race 56 and seedling resistance to race 15B of Puc-cinia graminis tritici, were controlled by a single dominant gene. Greenhouse temperatures of 80-85[degree]F were satisfactory, and those between 65 and 70[degree]F were unsatisfactory, for differentiating between resistance and susceptibility to stem rust. Genes for resistance to stem rust and to race Vr of U. nuda in the var. Valentine were found to be linked with a recombination value of 9.2 [plus or minus] 1.8%.

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