title: Genetic Linkage Mapping of Economically Important Traits in Cultivated Tetraploid Potato (Solanum tuberosum L.).
abstract: The objective of this study was to construct a single nucleotide polymorphism (SNP)-based genetic map at the cultivated tetraploid level to locate quantitative trait loci (QTL) contributing to economically important traits in potato (Solanum tuberosum L.). The 156 F1 progeny and parents of a cross (MSL603) between "Jacqueline Lee" and "MSG227-2" were genotyped using the Infinium 8303 Potato Array. Furthermore, the progeny and parents were evaluated for foliar late blight reaction to isolates of the US-8 genotype of Phytophthora infestans (Mont.) de Bary and vine maturity. Linkage analyses and QTL mapping were performed using a novel approach that incorporates allele dosage information. The resulting genetic maps contained 1972 SNP markers with an average density of 1.36 marker per cM. QTL mapping identified the major source of late blight resistance in "Jacqueline Lee." The best SNP marker mapped ~0.54 Mb from a resistance hotspot on the long arm of chromosome 9. For vine maturity, the major-effect QTL was located on chromosome 5 with allelic effects from both parents. A candidate SNP marker for this trait mapped ~0.25 Mb from the StCDF1 gene, which is a candidate gene for the maturity trait. The identification of markers for P. infestans resistance will enable the introgression of multiple sources of resistance through marker-assisted selection. Moreover, the discovery of a QTL for late blight resistance not linked to the QTL for vine maturity provides the opportunity to use marker-assisted selection for resistance independent of the selection for vine maturity classifications.
authors.affiliation: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824.
authors.forename: Alicia N
authors.initials: AN
authors.lastname: Massa
authors.affiliation: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824.
authors.forename: Norma C
authors.initials: NC
authors.lastname: Manrique-Carpintero
authors.affiliation: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824.
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Coombs
authors.affiliation: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824.
authors.forename: Daniel G
authors.initials: DG
authors.lastname: Zarka
authors.affiliation: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824.
authors.forename: Anne E
authors.initials: AE
authors.lastname: Boone
authors.affiliation: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824.
authors.forename: William W
authors.initials: WW
authors.lastname: Kirk
authors.affiliation: Biomathematics and Statistics Scotland, Invergowrie, Dundee, DD2 5DA, United Kingdom.
authors.forename: Christine A
authors.initials: CA
authors.lastname: Hackett
authors.affiliation: The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, United Kingdom.
authors.forename: Glenn J
authors.initials: GJ
authors.lastname: Bryan
authors.affiliation: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824 douchesd@msu.edu.
authors.forename: David S
authors.initials: DS
authors.lastname: Douches
mesh_terms: D060467:Disease Resistance / Q000235:genetics; D008040:Genetic Linkage; D055750:Phytophthora infestans / Q000472:pathogenicity; D020641:Polymorphism, Single Nucleotide; D040641:Quantitative Trait Loci; D011198:Solanum tuberosum / Q000235:genetics* / Q000254:growth & development / Q000382:microbiology; D057891:Tetraploidy
keywords: QTL; autotetraploid; genetic linkage map; potato; single-nucleotide polymorphism