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Title: Identification of a major QTL for Xanthomonas arboricola pv. pruni resistance in apricot
Authors : Socquet-Juglard, Didier
Duffy, Brion
Pothier, Joël F.
Christen, Danilo
Gessler, Cesare
Pattochi, Andrea
Published in : Tree Genetics and Genomes
Volume(Issue) : 9
Issue : 2
Pages : 409
Pages to: 421
Publisher / Ed. Institution : Springer
Publisher / Ed. Institution: Berlin
Issue Date: Apr-2013
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Bacterial spot; Prunus armeniaca; Microsatellite; Amplified fragment length polymorphism; Marker-assisted selection; Quantitative trait loci
Subject (DDC) : 570: Biology
Abstract: Xanthomonas arboricola pv. pruni causes bacterial spot of stone fruit resulting in severe yield losses in apricot production systems. Present on all continents, the pathogen is regulated in Europe as a quarantine organism. Host resistance is an important component of integrated pest management; however, little work has been done describing resistance against X. arboricola pv. pruni. In this study, an apricot population derived from the cross “Harostar” × “Rouge de Mauves” was used to construct two parental genetic maps and to perform a quantitative trait locus analysis of resistance to X. arboricola pv. pruni. A population of 101 F1 individuals was inoculated twice for two consecutive years in a quarantine greenhouse with a mixture of bacterial strains, and disease incidence and resistance index data were collected. A major QTL for disease incidence and resistance index accounting respectively for 53 % (LOD score of 15.43) and 46 % (LOD score of 12.26) of the phenotypic variation was identified at the same position on linkage group 5 of “Rouge de Mauves.” Microsatellite marker UDAp-452 co-segregated with the resistance, and two flanking microsatellites, namely BPPCT037 and BPPCT038A, were identified. When dividing the population according to the alleles of UDAp-452, the subgroup with unfavorable allele had a disease incidence of 32.6 % whereas the group with favorable allele had a disease incidence of 21 %, leading to a reduction of 35.6 % in disease incidence. This study is a first step towards the marker-assisted breeding of new apricot varieties with an increased tolerance to X. arboricola pv. pruni.
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Publication type: Article in scientific Journal
DOI : 10.1007/s11295-012-0562-z
ISSN: 1614-2942
Published as part of the ZHAW project : Comparative genomics of the plant pathogen Xanthomonas arboricola pv. pruni and related xanthomonads
Appears in Collections:Publikationen Life Sciences und Facility Management

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