Major-effect QTLs for stem and foliage resistance to late blight in the wild potato relatives Solanum sparsipilum and S. spegazzinii are mapped to chromosome X.
To find out new resistance sources to late blight in the wild germplasm for potato breeding, we examined the polygenic resistance of Solanum sparsipilum and S. spegazzinii by a quantitative trait locus (QTL) analysis. We performed stem and foliage tests under controlled conditions in two diploid mapping progenies. Four traits were selected for QTL detection. A total of 30 QTLs were mapped, with a large-effect QTL region on chromosome X detected in both potato relatives. The mapping of literature-derived markers highlighted colinearities with published late blight QTLs or R-genes. Results showed (a) the resistance potential of S. sparsipilum and S. spegazzinii for late blight control, and (b) the efficacy of the stem test as a complement to the foliage test to break down the complex late blight resistance into elementary components. The relationships of late blight resistance QTLs with R-genes and maturity QTLs are discussed.
Danan
Sarah
S
INRA, UR 1052 GAFL Génétique et Amélioration des Fruits et Légumes, BP 94, 84140, Montfavet, France.
Chauvin
Jean-Eric
JE
Caromel
Bernard
B
Moal
Jean-Denis
JD
Pellé
Roland
R
Lefebvre
Véronique
V
D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics*; D004843:Epistasis, Genetic; D005819:Genetic Markers; D007113:Immunity, Innate / Q000235:genetics; D010935:Plant Diseases / Q000235:genetics / Q000276:immunology*; D018515:Plant Leaves / Q000235:genetics*; D018547:Plant Stems / Q000235:genetics*; D025341:Principal Component Analysis; D040641:Quantitative Trait Loci / Q000235:genetics*; D011198:Solanum tuberosum / Q000235:genetics*
D005819:Genetic Markers