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A new gene for resistance to Dysaphis pyri in pear and identification of flanking microsatellite markers

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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.

Le Dysaphis pyri est un insecte ravageur important chez les cultivars européens du poirier (Pyrus communis); aucun de ceux-ci n’étant rapporté résistant. Dans ce travail, les auteurs ont produit une progéniture découlant du croisement entre le cultivar européen Comice et une accession du poirier sauger (Pyrus nivalis) qui était en ségrégation mendélienne pour la résistance au D. pyri et suggérait la présence d’un gène majeur, Dp-1. Après criblage des parents et des jeunes plantules de la descendance avec des marqueurs microsatellites, une analyse de co-ségrégation a montré que Dp-1 est flanqué par les marqueurs NH006b et NH014a sur le groupe de liaison 17, à 2,3 et 3,6 cM respectivement. Des évidences sont également présentées pour la duplication des groupes de liaison 9 et 17, un phénomène qui découlerait de l’origine allotétraploïde de la poire.

Document Type: Research Article

Publication date: 2008-12-01

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  • From its inception in 1957, this international cytogenetics journal has catered to the research areas of the members of the Genetics Society of Canada; traditionally, these have included agriculture, entomology, genetics/cytogenetics, and evolutionary mechanisms. The contents of the journal have evolved as contributors developed new technologies and interests. A 20-member Editorial Board is composed of scientists from around the world. Reviews and commentary from respected experts are often featured.
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