Inheritance of Resistance to Kernel Discoloration of Barley. Monte R. Miles, Former Research Assistant, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Roy D. Wilcoxson, and Donald C. Rasmusson. Professor, Department of Plant Pathology, and Professor, Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul 55108. Plant Dis. 73:711-715. Accepted for publication 28 February 1989. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0711.

Progeny derived from six crosses of barleys resistant and susceptible to kernel discoloration were evaluated for resistance in the F₂ and F₃ generations. Plants were grown in the field under irrigation and inoculated with Bipolaris sorokiniana. Heritability estimates of 27–43% were obtained on an individual F₂ plant basis by parent-progeny correlation. Heritability estimates of 48–76% were obtained on a family basis from variance components from replicated F₃ nurseries. Distributions of the F₂ and F₃ populations were nearly continuous and tended to follow a bell shape. Data from both generations failed to confirm a fit to simple hypothesized segregation ratios. Transgressive segregation toward susceptibility was observed in F₃ populations of all crosses.