Abstract
Powdery mildew caused by the airborne biotrophic fungus Blumeria graminis f. sp. hordei is a common disease of barley. Although it can be controlled by fungicide applications, genetic resistance is an efficient and more environmentally acceptable way of limiting its effect on yield and quality. Spring barley is the second largest cereal crop in the Czech Republic and seventy spring barley cultivars (cvs.) were registered from 1996 to 2010. Seedlings of 43 cvs. were tested for reaction to selected isolates of the pathogen and resistance genes were identified using the postulation method. The following 12 known resistance genes were postulated namely, mlo, Mla6, Mla8, Mla12, Mla13, MlaRu4, MlaN81, Mlg, MlLa, Ml(Ab), Ml(Ro) and Ml(St) and two unknown resistances were found in Paulis and Prosa. Four cvs. (Azit, Paulis, Respekt and Tocada) were heterogeneous for mildew response. The most frequently found gene was mlo, which was present in 29 cvs. In nine of 15 cvs. without mlo, Mlg occurred and in seven cvs. genes located in the Mla locus were postulated. A newly identified resistance in Prosa will be further characterised. This report demonstrates that resistance gene postulation from multi-race tests remains an essential research tool for postulating genes for resistance to plant pathogens.
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Acknowledgments
Excellent technical assistance of Mrs. Dagmar Krejčířová is gratefully acknowledged. The article was generated within project no. RO-0211-3021 supported by the Ministry of Agriculture of the Czech Republic.
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Dreiseitl, A. Postulation of genes for resistance to powdery mildew in spring barley cultivars registered in the Czech Republic from 1996 to 2010. Euphytica 191, 183–189 (2013). https://doi.org/10.1007/s10681-012-0741-x
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DOI: https://doi.org/10.1007/s10681-012-0741-x