TRANSFER OF POWDERY MILDEW RESISTANCE FROM AGILOPS VARIABILIS INTO BREAD WHEAT

Winter hexaploid wheat (Triticum aestivum L.) was crossed with Aegilop s variabilis to transfer resistance to powdery mildew into wheat. Foll owing two backcrosses to wheat and from 5 to 9 generations of selfing, several disomic addition and substitution lines of hexaploid wheat re sistant to the mildew pathogen were isolated. A pair of short satellit ed chromosomes was always observed in the resistant lines. Further evi dence utilizing as markers for homoeologous group 1 HMW glutenin subun its and DNA hybridization with probe pGBX 3076 showed that an alien su bstitution involved this homoeologous group.