title: A new gene for resistance to Dysaphis pyri in pear and identification of flanking microsatellite markers.
abstract: Dysaphis pyri is an important aphid pest of European pear (Pyrus communis) cultivars, none of which are currently reported to be resistant. In this study, we produced a progeny of the European pear Comice crossed with an accession of snow pear (Pyrus nivalis) that segregated for resistance to D. pyri in a Mendelian fashion, indicating the presence of a major gene, Dp-1. Following screening of the parents and seedlings with microsatellite markers, cosegregation analysis indicated that Dp-1 is flanked by NH006b and NH014a on linkage group 17, 2.3 and 3.6 cM away, respectively. Evidence is also presented for the duplication of linkage groups 9 and 17, which is a consequence of the allopolyploid origin of pear.
authors.affiliation: East Malling Research, New Road, East Malling, Kent ME19 6BJ, UK. .
authors.forename: Kate M
authors.initials: KM
authors.lastname: Evans
authors.forename: Ceri L
authors.initials: CL
authors.lastname: Govan
authors.forename: Felicidad
authors.initials: F
authors.lastname: Fernández-Fernández
mesh_terms: D024509:3' Flanking Region / Q000235:genetics; D024506:5' Flanking Region / Q000235:genetics; D000818:Animals; D001042:Aphids; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D017343:Genes, Plant / Q000502:physiology; D006790:Host-Parasite Interactions / Q000235:genetics; D007113:Immunity, Innate / Q000235:genetics*; D018895:Microsatellite Repeats / Q000235:genetics*; D010935:Plant Diseases / Q000235:genetics*; D031989:Pyrus / Q000235:genetics* / Q000469:parasitology