Summary
The Pl6 locus in the inbred sunflower (Helianthus annuus L.) line HA335 giving resistance to French races of downy mildew (Plasmopara halstedii (Farl.) Berl. & de Toni. was localized by molecular techniques. A bulked segregant analysis was made on the F2 progeny from a cross between this line and H52, a downy mildew susceptible line. The resistance gene in HA335 was found to have the same linked RFLP marker loci as those determined for Pl1 (resistance to race 1 in the line RHA266) on linkage group 1 of the consensus RFLP map of the cultivated sunflower. Pl1 and Pl6 thus appear either to be allelic or closely linked. The implications for sunflower breeding are discussed.
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Roeckel-Drevet, P., Gagne, G., Mouzeyar, S. et al. Colocation of downy mildew (Plasmopara halstedii) resistance genes in sunflower (Helianthus annuus L.). Euphytica 91, 225–228 (1996). https://doi.org/10.1007/BF00021074
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DOI: https://doi.org/10.1007/BF00021074