Mapping of quantitative trait loci controlling broomrape (Orobanche crenata Forsk.) resistance in faba bean (Vicia faba L.).
Orobanche crenata Forsk. is a root parasite that produces devastating effects on many crop legumes and has become a limiting factor for faba bean production in the Mediterranean region. The efficacy of available control methods is minimal and breeding for broomrape resistance remains the most promising method of control. Resistance seems to be scarce and complex in nature, being a quantitative characteristic difficult to manage in breeding programmes. To identify and map the QTLs (quantitative trait loci) controlling the trait, 196 F2 plants derived from the cross between a susceptible and a resistant parent were analysed using isozymes, RAPD, seed protein genes, and microsatellites. F2-derived F3 lines were studied for broomrape resistance under field conditions. Of the 130 marker loci segregating in the F2 population, 121 could be mapped into 16 linkage groups. Simple interval mapping (SIM) and composite interval mapping (CIM) were performed using QTL Cartographer. Composite interval mapping using the maximum number of markers as cofactors was clearly the most efficient way to locate putative QTLs. Three QTLs for broomrape resistance were detected. One of the three QTLs explained more than 35% of the phenotypic variance, whereas the others accounted for 11.2 and 25.5%, respectively. This result suggests that broomrape resistance in faba bean can be considered a polygenic trait with major effects of a few single genes.
Román
Belén
B
Departamento de Mejora y Agronomía CIFA-Alameda del Obispo, Apdo 3092, 14080 Córdoba, Spain. broman.cifao@cap.junta-andalucia.es
Torres
Ana Ma
AM
Rubiales
Diego
D
Cubero
Jose Ignacio
JI
Satovic
Zlatko
Z
D001483:Base Sequence; D017931:DNA Primers; D019684:Magnoliopsida / Q000502:physiology*; D040641:Quantitative Trait Loci; D019105:Random Amplified Polymorphic DNA Technique; D031307:Vicia faba / Q000235:genetics* / Q000382:microbiology
D017931:DNA Primers