Abstract
Downy mildew caused by Plasmopara halstedii is one of the major dangers of sunflower in most of the world’s growing areas. A number of major dominant resistance genes (Pl genes) have been either identified in cultivated sunflower or were introduced from wild Helianthus annuus or other wild Helianthus species. However, many aspects of the resistance genetics remain unclear. RAPD and AFLP analysis of near isogenic lines differing in the Pl 2 locus and bulked segregant analysis (BSA) of F2 populations, segregating for race 7 and 9 resistances originating from H. annuus (Pl 2), and race 5 resistance derived from H. annuus (Pl 6) and H. argophyllus (Pl arg) respectively, were used to identify molecular markers for different sources of resistance against downy mildew. On the basis of these markers, linkage maps for both populations were constructed representing the genomic regions carrying the respective resistance locus. The investigations confirmed the close relationship of Pl2 and Pl6, whereas no association was found for loci Pl2 and Plarg.
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Brahm, L., Röcher, T., Horn, R., Prüfe, M., Friedt, W. (1999). Mapping different resistances against downy mildew in sunflower. In: Mugnozza, G.T.S., Porceddu, E., Pagnotta, M.A. (eds) Genetics and Breeding for Crop Quality and Resistance. Developments in Plant Breeding, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4475-9_11
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DOI: https://doi.org/10.1007/978-94-011-4475-9_11
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