title: Development and linkage mapping of E-STS and RGA markers for functional gene homologues in apple.
abstract: Linkage maps developed from known-function genes can be valuable in the candidate gene mapping approach. A set of 121 expressed sequence tagged site (E-STS) primer pairs were tested on a framework genetic linkage map of apple (Malus x domestica Borkh.) constructed using simple sequence repeats (SSRs) and randomly amplified polymorphic DNA (RAPD) markers. These known-function gene markers, E-STSs, were supplemented by markers for resistance gene analogues (RGAs), designed based on conserved motifs in all characterized resistance genes isolated from plant species. A total of 229 markers, including 46 apple E-STSs, 8 RGAs, 85 SSRs from apple and peach, and 88 RAPDs, were assigned to 17 linkage groups covering 832 cM of the apple genome, based on 52 individuals originating from the cross 'Antonovka debnicka' (Q12-4) x 'Summerred'. Clusters of E-STS and RGA loci were located in linkage groups previously identified to carry resistance genes, some of which confer resistance to apple scab disease caused by Venturia inaequalis (Cke.) Wint.
authors.affiliation: Agriculture and Agri-food Canada, Pacific Agri-Food Centre, Summersland, Canada.
authors.forename: Suresh
authors.initials: S
authors.lastname: Naik
authors.forename: Cheryl
authors.initials: C
authors.lastname: Hampson
authors.forename: Ksenija
authors.initials: K
authors.lastname: Gasic
authors.forename: Guus
authors.initials: G
authors.lastname: Bakkeren
authors.forename: Schuyler S
authors.initials: SS
authors.lastname: Korban
mesh_terms: D001483:Base Sequence; D002874:Chromosome Mapping; D018744:DNA, Plant / Q000235:genetics; D020224:Expressed Sequence Tags; D017343:Genes, Plant; D005819:Genetic Markers; D027845:Malus / Q000235:genetics*; D010935:Plant Diseases / Q000235:genetics; D019105:Random Amplified Polymorphic DNA Technique; D016324:Sequence Tagged Sites
chemical_list: D018744:DNA, Plant; D005819:Genetic Markers