Abstract
The genetics of avirulences towards barley mildew resistances were analysed in crosses of the Ervsiphe graminis f.sp. hordei isolate DH14 with CC107 and with CC138. Nine avirulences, Avra9, Avra10, Avra11, Avra12, AvrAb, AvrCP, Avrh, Avrk and AvrLa, segregated as single genes in one or other cross. However. F1 segregation data were consistent with avirulence matching the Mla7 resistance gene being controlled by two genes, designated Avra71 and Avra72. Infection types of avirulent isolates differed on varieties in which Mla7 had been derived from each of the four known sources of that resistance. Linkage was detected between Avra71 and Avrh in the cross CC107 × DH14, and between Avra10 and Avrk, Avra11 and AvrLa, and Avrh and the triadimenol response gene Tdl2 in CC138 × DH14.
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