Inheritance of quantitative resistance to downy mildew (Plasmopara halstedii) in sunflower (Helianthus annuus L.)

• Published in: Euphytica Vol. 164; no. 2; pp. 561 - 570
• Main Authors: Vear, F, Serre, F, Jouan-Dufournel, I, Bert, P. F, Roche, S, Walser, P, Tourvieille de Labrouhe, D, Vincourt, P
• Format: Journal Article
• Language: English
• Published: Dordrecht Dordrecht : Springer Netherlands 01.11.2008; Springer Netherlands; Springer; Springer Nature B.V
• Subjects: Agronomy. Soil science and plant productions; Airborne microorganisms; Biological and medical sciences; Biomedical and Life Sciences; Biotechnology; chromosome mapping; disease resistance; downy mildew; Fundamental and applied biological sciences. Psychology; Gene mapping; Genetic markers; Genetics and breeding of economic plants; Helianthus; Helianthus annuus; heritability; Hybridization; Hybrids; Inbreeding; inheritance (genetics); Life Sciences; linkage groups; major genes; Pest resistance; Plant Genetics and Genomics; Plant pathogens; Plant Pathology; Plant Physiology; Plant reproduction; Plant resistance; Plant Sciences; Plasmopara halstedii; quantitative resistance; quantitative trait loci; quantitative traits; Varietal selection. Specialized plant breeding, plant breeding aims; QTL; Hybrids; Heritability; Inbred lines; Major genes; Markers; Stramenopila; Plant pathogen; Hybrid; Marker; Compositae; Oomycota; Genetic determinism; Major gene; Fungus resistance; Quantitative trait loci; Helianthus annuus; Plasmopara halstedii; Dicotyledones; Angiospermae; Genetic improvement; Spermatophyta; Nonspecific resistance; Heritability, Inbred lines· Hybrids· Markers; Sunflower; Pure line; Oil plant (vegetal)
• ISSN: 0014-2336; 1573-5060
• DOI: 10.1007/s10681-008-9759-5

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.