title: Identification of environmentally stable QTL for resistance against Leptosphaeria maculans in oilseed rape (Brassica napus).
abstract: Six stable QTL for resistance against L. maculans (phoma stem canker) have been identified by QTL × environment interaction analysis using data from five winter oilseed rape field experiments. Phoma stem canker, caused by Leptosphaeria maculans, is a disease of worldwide importance on oilseed rape (Brassica napus). Quantitative trait loci (QTL)-mediated resistance against L. maculans in B. napus is considered to be race non-specific and potentially durable. Identification and evaluation of QTL for resistance to L. maculans is important for breeding oilseed rape cultivars with durable resistance. An oilseed rape mapping population was used to detect QTL for resistance against L. maculans in five winter oilseed rape field experiments under different environments. A total of 17 QTL involved in 'field' quantitative resistance against L. maculans were detected and collectively explained 51% of the phenotypic variation. The number of QTL detected in each experiment ranged from two to nine and individual QTL explained 2-25% of the phenotypic variation. QTL × environment interaction analysis suggested that six of these QTL were less sensitive to environmental factors, so they were considered to be stable QTL. Markers linked to these stable QTL will be valuable for selection to breed for effective resistance against L. maculans in different environments, which will contribute to sustainable management of the disease.
authors.affiliation: Centre for Agriculture, Food and Environmental Management, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK. y.huang8@herts.ac.uk.|Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK. y.huang8@herts.ac.uk.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Huang
authors.affiliation: Terres Inovia, 78850, Thiverval-Grignon, France.|INRA, UMR1349 IGEPP, BP 35327, 35653, Le Rheu Cedex, France.
authors.forename: C
authors.initials: C
authors.lastname: Jestin
authors.affiliation: Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK.|VSN International Ltd, Waterhouse Street, Hemel Hempstead, Hertfordshire, HP1 1ES, UK.
authors.forename: S J
authors.initials: SJ
authors.lastname: Welham
authors.affiliation: Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK.|Southern Cross University, Lismore, NSW, 2480, Australia.
authors.forename: G J
authors.initials: GJ
authors.lastname: King
authors.affiliation: INRA, UMR1349 IGEPP, BP 35327, 35653, Le Rheu Cedex, France.|Agrocampus Ouest, UMR1349 IGEPP, BP 35327, 35653, Le Rheu Cedex, France.
authors.forename: M J
authors.initials: MJ
authors.lastname: Manzanares-Dauleux
authors.affiliation: Centre for Agriculture, Food and Environmental Management, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK.|Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK.
authors.forename: B D L
authors.initials: BD
authors.lastname: Fitt
authors.affiliation: INRA, UMR1349 IGEPP, BP 35327, 35653, Le Rheu Cedex, France.
authors.forename: R
authors.initials: R
authors.lastname: Delourme
mesh_terms: D001203:Ascomycota; D029688:Brassica napus / Q000235:genetics* / Q000382:microbiology; D001947:Breeding; D002874:Chromosome Mapping; D060467:Disease Resistance / Q000235:genetics*; D004777:Environment; D008957:Models, Genetic; D015233:Models, Statistical; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology; D040641:Quantitative Trait Loci