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Identification of Genes at the Ml-a Locus in Barley for Resistance to Erysiphe graminis F. sp. Hordei¹

The pathogenicity of haploid progeny from the cross of cultures CR3 and 63.5 of Erysiphe graminis [DC.] Merat hordei Em. Marchal was determined on 11 barley (Hordeum vulgare L.) varieties, each known to have a resistance gene at the Ml-a locus. Different genes were shown to condition the pathogenicity of cultures CR3 and 63.5 on the ll varieties, indicating the corresponding resistance genes in those varieties are different. Genes in seven of the varieties — ‘Algerian,’ ‘Black Russian,’ ‘Ricardo,’ ‘No. 22,’ ‘Gopal,’ ‘Iso 20,’ and ‘Line 4831’ — had previously been designated Ml-a through Ml-a7. We propose the genes in varieties ‘Heil's Hanna,’ ‘Monte Cristo,’ ‘Iso 12,’ and ‘A222’ be designated Ml-a8, Ml-a9, Ml-al0, and Ml-a11, respectively.

Key Words: Hordeum vulgare L. • Pathogenicity

² Research Plant Pathologist, Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705, and Geneticist, Atomic Energy Commission, Research Establishment Riso, 4000 Roskilde, Denmark, respectively.

Received for publication January 23, 1971.