Powdery‐mildew‐resistance genes Mla29 and Mla32 in H. spontaneum derived winter‐barley lines

Allelism to the highly polymorphic Mia locus was demonstrated for the powdery‐mildew resistance of two Hordeum spontaneum derived winter–barley lines, ‘110‐4 × Sonja’ and ‘142–29 × Dura’, by testing the F2 progeny of crosses between these lines and the winter‐barley cv. ‘Triton’ (Mlal3) with two appropriate isolates. The results were confirmed by RFLP analysis, using the probe MWG 1H036, which is very closely linked to the Mia locus. The designations Mla29 and Mla32 are proposed for the genes identified in the two lines.