title: A detailed linkage map of lettuce based on SSAP, AFLP and NBS markers.
abstract: Molecular markers based upon a novel lettuce LTR retrotransposon and the nucleotide binding site-leucine-rich repeat (NBS-LRR) family of disease resistance-associated genes have been combined with AFLP markers to generate a 458 locus genetic linkage map for lettuce. A total of 187 retrotransposon-specific SSAP markers, 29 NBS-LRR markers and 242 AFLP markers were mapped in an F(2) population, derived from an interspecific cross between a Lactuca sativa cultivar commonly used in Europe and a wild Lactuca serriola isolate from Northern Europe. The cross has been designed to aid efforts to assess gene flow from cultivated lettuce into the wild in the perspective of genetic modification biosafety. The markers were mapped in nine major and one minor linkage groups spanning 1,266.1 cM, with an average distance of 2.8 cM between adjacent mapped markers. The markers are well distributed throughout the lettuce genome, with limited clustering of different marker types. Seventy-seven of the AFLP markers have been mapped previously and cross-comparison shows that the map from this study corresponds well with the previous linkage map.
authors.affiliation: Plant Research Unit, University of Dundee at SCRI, Invergowrie, Dundee, DD2 5DA, UK.
authors.forename: Naeem H
authors.initials: NH
authors.lastname: Syed
authors.forename: Anker P
authors.initials: AP
authors.lastname: Sørensen
authors.forename: Rudie
authors.initials: R
authors.lastname: Antonise
authors.forename: Clemens
authors.initials: C
authors.lastname: van de Wiel
authors.forename: C Gerard
authors.initials: CG
authors.lastname: van der Linden
authors.forename: Wendy
authors.initials: W
authors.lastname: van 't Westende
authors.forename: Danny A P
authors.initials: DA
authors.lastname: Hooftman
authors.forename: Hans C M
authors.initials: HC
authors.lastname: den Nijs
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Flavell
mesh_terms: D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D003433:Crosses, Genetic; D018744:DNA, Plant; D008040:Genetic Linkage; D005819:Genetic Markers; D018745:Genome, Plant; D018545:Lactuca / Q000235:genetics*; D020084:Long Interspersed Nucleotide Elements; D018895:Microsatellite Repeats; D019105:Random Amplified Polymorphic DNA Technique; D020079:Terminal Repeat Sequences
chemical_list: D018744:DNA, Plant; D005819:Genetic Markers