In order to localize a gene for resistance to Barley Yellow Mosaic Virus (BaYMV) of German resistant varieties, cvs. 'Ogra' and 'Sonate' were crossed to a complete trisomic (2n=2x+1=15) set of 'Shin Ebisu 16'. Tests for resistance in F2 strongly support the conclusion that the German gene for resistance to BaYMV is located on barley chromosome 3.

In order to identify the chromosome arm carrying a gene for resistance to barley mild mosaic virus (BaMMV) in German winter barley cultivars, a line trisomic for the long arm of chromosome 3 (telotrisomic 3L) was crossed to the resistant cvs. 'Sonate' and 'Ogra'. Results of tests for BaMMV reaction in the F2 indicate that the gene for resistance in German cultivars is located on the long arm of chromosome 3.

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The BaYMV resistance of German cultivars like Diana, Franka, Gloria or Sonate is due to one recessive gene (‘German gene’), located on barley chromosome 3. This gene and the gene Ym1 are most probably allelic (or tightly linked). Resistance of the American cv. Anson barley is inherited independently of the ‘German gene’ and Ym1. The haploidy technique is an efficient means for approaching major breeding goals: (1) to improve quality characteristics of cultivars carrying‘German resistance' (2) to adapt exotic germplasm carrying the gene Yml to European growing conditions; (3) to broaden the genetic base of BaYMV resistance by incorporating additional ‘new’ resistance genes.

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