title: QTL analysis of root-lesion nematode resistance in barley: 1. Pratylenchus neglectus.
abstract: The root-lesion nematode Pratylenchus neglectus can cause severe losses in barley cultivation. Multiplication rates had been found to vary greatly between different barley accessions. Two winter barley cultivars, Igri and Franka, had been found to differ in their ability to resist this parasite. An existing Igri × Franka doubled haploid population was chosen to genetically map resistance genes after artificial inoculation with P. neglectus in the greenhouse and climate chamber. A continuous phenotypic variation was found indicating a quantitative inheritance of P. neglectus resistance. An existing map was enriched by 527 newly developed Diversity Array Technology markers (DArTs). The new genetic linkage map was comprised of 857 molecular markers that cover 1,157 cM on seven linkage groups. Using phenotypic data collected from four different experiments in 3 years, five quantitative trait loci were mapped by composite interval mapping on four (3H, 5H, 6H and 7H) linkage groups. A quantitative trait locus with a large phenotypic effect of 16% and likelihood of odds (LOD) score of 6.35 was mapped on linkage group 3H. The remaining four QTLs were classified as minor or moderate with LOD scores ranging from 2.71 to 3.55 and R (2) values ranging from 8 to 10%. The DNA markers linked to the resistance QTLs should be quite useful for marker-assisted selection in barley breeding because phenotypic selection is limited due to time constraints and labor costs.
authors.affiliation: Plant Breeding Institute, Christian-Albrechts-University of Kiel, Olshausenstrasse 40, Kiel, Germany.
authors.forename: Shiveta
authors.initials: S
authors.lastname: Sharma
authors.forename: Shailendra
authors.initials: S
authors.lastname: Sharma
authors.forename: Friedrich J
authors.initials: FJ
authors.lastname: Kopisch-Obuch
authors.forename: Tobias
authors.initials: T
authors.lastname: Keil
authors.forename: Eberhard
authors.initials: E
authors.lastname: Laubach
authors.forename: Nils
authors.initials: N
authors.lastname: Stein
authors.forename: Andreas
authors.initials: A
authors.lastname: Graner
authors.forename: Christian
authors.initials: C
authors.lastname: Jung
mesh_terms: D000818:Animals; D001947:Breeding; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D018744:DNA, Plant / Q000235:genetics; D008040:Genetic Linkage; D005819:Genetic Markers; D006238:Haploidy; D001467:Hordeum / Q000235:genetics* / Q000469:parasitology; D008126:Lod Score; D018895:Microsatellite Repeats; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics* / Q000469:parasitology; D018517:Plant Roots / Q000235:genetics* / Q000469:parasitology; D040641:Quantitative Trait Loci; D014431:Tylenchoidea / Q000254:growth & development* / Q000472:pathogenicity
chemical_list: D018744:DNA, Plant; D005819:Genetic Markers