PmAm, a broad-spectrum powdery mildew resistance source located on Amblyopyrum muticum chromosome 6T is transferred to common wheat

Abstract Powdery mildew (caused by Blumeria graminis f. sp. tritici) limits grain production and reduces grain quality in wheat. Amblyopyrum muticum (2n=2x=14, TT genomes), a wild relative of wheat, carries agronomically valuable traits, including resistance to powdery mildew, that have not been transferred to wheat. Here, a powdery mildew resistant Chinese Spring-Amblyopyrum muticum amphiploid was backcrossed to a powdery mildew susceptible wheat cultivar and homozygous resistant derivatives with broad-spectrum resistance were selected. Fluorescence in situ hybridization analysis identified chromosome substitution and compensating Robertsonian translocation lines involving chromosome 6T from Amblyopyrum muticum.