title: QTL molecular marker location of powdery mildew resistance in cucumber (Cucumis sativus L.).
abstract: The cucumber lines, S94 (Northern China open-field type, powdery mildew (PM) susceptible) and S06 (European greenhouse type, PM resistant), and their F(6:7) populations were used to investigate PM resistance under seedling spray inoculation in 2005/Autumn and 2006/Spring. QTL analysis was undertaken based on a constructed molecular linkage map of the corresponding F(6) population using composite interval mapping. A total of four QTLs (pm1.1, pm2.1, pm4.1 and pm6.1) for PM resistance were identified and located on LG 1, 2, 4 and 6, respectively, explaining 5.2%-21.0% of the phenotypic variation. Three consistent QTLs (pm1.1, pm2.1 and pm4.1) were detected under the two test conditions. The QTL pm6.1 was only identified in 2005/Autumn. The total phenotypic variation explained by the QTLs was 52.0% and 42.0% in 2005/Autumn and 2006/Spring, respectively. Anchor markers tightly linked to those loci (<5 cM) could lay a basis for both molecular marker-assisted breeding and map-based gene cloning of the PM-resistance gene in cucumber.
authors.affiliation: School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai, 200240, China.
authors.forename: Longzhou
authors.initials: L
authors.lastname: Liu
authors.forename: Run
authors.initials: R
authors.lastname: Cai
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Yuan
authors.forename: Huanle
authors.initials: H
authors.lastname: He
authors.forename: Junsong
authors.initials: J
authors.lastname: Pan
mesh_terms: D001203:Ascomycota / Q000472:pathogenicity*; D001947:Breeding; D002874:Chromosome Mapping; D018553:Cucumis sativus / Q000235:genetics* / Q000382:microbiology*; D017343:Genes, Plant; D005819:Genetic Markers; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology*; D040641:Quantitative Trait Loci
chemical_list: D005819:Genetic Markers