Colocation of downy mildew (Plasmopara halstedii) resistance genes in sunflower (Helianthus annuus L.)

Patricia Roeckel-Drevet, Geneviève Gagne, Said Mouzeyar, Laurent Gentzbittel, Jacqueline Philippon, Paul Nicolas, Denis Tourvieille De Labrouhe, Felicity Vear

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46 Citations (Scopus)


The P16 locus in the inbred sunflower (Helianthus annuus L.) line HA335 giving resistance to French races of downy mildew (Plasmopara halstedii (Farl.) Berl. and de Toni. was localized by molecular techniques. A bulked segregant analysis was made on the F 2 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 P11 (resistance to race 1 in the line RHA266) on linkage group 1 of the consensus RFLP map of the cultivated sunflower. P11 and P16 thus appear either to be allelic or closely linked. The implications for sunflower breeding are discussed.

Original languageEnglish
Pages (from-to)225-228
Number of pages4
Issue number2
Publication statusPublished - 1996
Externally publishedYes


  • bulked segregant analysis
  • downy mildew
  • Helianthus annuus
  • linkage
  • Plasmopara halstedii
  • resistance genes
  • RFLP
  • sunflower


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