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Genes Conditioning Resistance of Hordeum spontaneum to Erysiphe graminis f. sp. hordei¹

Wild relatives of commercial crops have provided many useful genes for disease and insect resistance. In this study the number of genes that condition resistance to Erysiphe graminis DC. ex Merat f. sp. hordei (Em. Marchal), which incites barley powdery mildew, in five Hordeum spontaneum C. Koch accessions (a wild relative of barley, Hordeum vulgare L.) were determined using a technique of double inoculation with two pathogenic cultures. PI 282660 and PI 354937 had two genes; PI 284750 and PI 296836 had three genes, and PI 296800 had four genes conditioning resistance to the less virulent culture. Based on reactions to the more virulent culture, some resistance genes were no longer effective. PI 282660, PI 284750, and PI 354937 had one gene, PI 296836 had three genes, and PI 296800 had four genes conditioning resistance to the more virulent culture. The double inoculation technique is a powerful tool for determining the number of resistance genes, their relationships, and their effectiveness in conditioning resistance. H. spontaneum germplasm is and will continue to be a useful source of resistance genes to E. graminis hordei.

Key Words: Barley • Powdery mildew • Disease • Genetics

² Chairman, research geneticist, and research plant pathologist, respectively, Plant Genetics and Germplasm Institute, NER, AR, SEA, USDA, Beltsville, MD.

Received for publication May 19, 1980.