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Inheritance of pathogenicity in Ustilago avenae



Inheritance of pathogenicity in Ustilago avenae



Res Stud State Coll Washington 24(4): 348-386



This study on the heritability in 3 well-defined races of Ustilago avenae shows that individual spores of a given race may be either homozygous or heterozygous for this character. Progeny families of hybrids between homozygous parents were strongly pathogenic on all susceptible varieties, whereas those from hybrids between heterozygous parents segregated into various ratios of strong to weak pathogenicity on these same varieties. This can be explained by postulating a genetic system of complementary factors for pathogenicity, designated as A-B-. Strong pathogenicity is expressed only where the dominant, non-allelic factors are brought together in the same genotype. Weak pathogenicity results when the dominant complementary factors occur singly in separate genotypes, a situation that may be brought about by crossing over. Differential host reactions among the parent races on the varieties Monarch and Camas are conditioned by specific genetic factors, one factor governing the differential pathogenicity of each race. Segregation and recombination of factors governing pathogenicity in the F2 occurred in a 31 ratio. Occasionally 4:0 ratios were encountered in which case the recombination had merely produced new hybrid combination. A new combination of pathogenicity factors occurred in 1 cross between race A-5 and A-7, thus producing a distinctly different pathogenic genotype.

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