Abstract
Quantitative resistance to sunflower downy mildew was studied on inbred lines and hybrids not carrying efficient major gene resistance, in field trials in one to four sites over 3 years. Hybrids from factorial crosses showed that inheritance is under additive control and comparison with reactions of parental inbred lines gave narrow sense heritabilities of 27–57%. Analysis of a polymorphic recombinant inbred line population without efficient major gene resistance indicated that two highly significant Quantitative Trait Loci (QTL) explained 42% of variation in field reaction to downy mildew. These QTL were mapped on linkage groups 8 and 10, and do not appear related to any of the known major resistance gene clusters. Possible bases of this type of resistance and its use in breeding are discussed.
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Acknowledgements
We would like to thank the personnel of the INRA farm at Clermont-Ferrand for their help in the trials. Promosol provided financial support for this programme, which was made with the support and collaboration of Cetiom, Caussade, Maïsadour, Monsanto, Pioneer, R.A.G.T., Soltis and Syngenta.
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Vear, F., Serre, F., Jouan-Dufournel, I. et al. Inheritance of quantitative resistance to downy mildew (Plasmopara halstedii) in sunflower (Helianthus annuus L.). Euphytica 164, 561–570 (2008). https://doi.org/10.1007/s10681-008-9759-5
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DOI: https://doi.org/10.1007/s10681-008-9759-5