Suppression of powdery mildew resistance gene Pm8 in Triticum aestivum L (common wheat) cultivars carrying wheat-rye translocation T1BL center dot 1RS

Disease response pattern of 127 T1B . 1RS translocation and substitution wheat cultivars, possessing powdery mildew resistance gene Pm8 and leaf rust resistance gene Lr26 located on rye chromosome arm 1RS, revealed that sixteen of these cultivars express Lr26, but not concomitant Pm8 resistance. The mode of inheritance studied in the F-1, F-2 and F-3 generations, and involving hybrids of cultivars Agra, Florida, Olymp, Sabina and Tjelvar not expressing Pm8 resistance indicated inhibition of resistance gene Pm8 by a dominant suppressor.