MOLECULAR MAPPING OF NOVEL RESISTANCE GENES AGAINST BARLEY MILD MOSAIC-VIRUS (BAMMV)

In the present study three novel genes from barley accessions 10247 (y m8), Bulgarian 347 (ym9), and Russia 57 (ym11), which confer resistanc e to Barley Mild Mosaic Virus (BaMMV), were mapped using molecular mar kers. Bulked segregant analysis of four progenies segregating for resi stance to BaMMV was followed by fine-scale mapping of the resistance g enes using individual F-2 or BC1F2 plants. The resistance genes are in herited recessively and are located on the long arm of barley chromoso me 4HL. A series of closely linked molecular markers are available for marker-assisted breeding programs. A marker (MWG2134) linked with res istance gene ym11 from Russia 57 was identified, which is diagnostic f or the resistance gene.