title: Gene action for adult-plant resistance to powdery mildew in wheat.
abstract: Gene action for adult-plant resistance to powdery mildew was studied using generation mean analyses of parents and of F1, F2, and backcross populations derived from a diallel cross of one susceptible and three adult-plant resistant wheat cultivars. Joint scaling tests showed that an additive-dominance model was sufficient to explain the variability in the expression of adult-plant resistance in one cross, while digenic epistasis was involved in the other five crosses. Additive gene effects were predominant; however, dominance was significant in four crosses, additive x additive interaction was significant in three crosses, additive x dominance interaction was significant in three crosses, and dominance x dominance interaction was significant in one cross. Therefore, selection for adult-plant resistance would likely be most effective in advanced generations derived from crosses among the adult-plant resistant cultivars Redcoat, Houser, and Massey.
authors.forename: M K
authors.initials: MK
authors.lastname: Das
authors.forename: C A
authors.initials: CA
authors.lastname: Griffey