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Identification of a major QTL for Xanthomonas arboricola pv. pruni resistance in apricot

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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.

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Acknowledgments

This project was funded by the Swiss Secretariat for Education and Research (SBF COST C08.0124) and was conducted within the European Science Foundation funded research network COST Action 873. We thank Dr. Jürg Frey for support in the laboratory, Rolf Blapp for the grafting of the material; Dr. Fabio Rezzonico for his help with AFLPs; and Jürgen Krauss, Carmela Total, Perrine Ferrié and Verena Knorst for technical support.

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  1. Phytopathology, Research Station Agroscope Changins-Wädenswil (ACW), Schloss 1, 8820, Wädenswil, Switzerland

    D. Socquet-Juglard, B. Duffy, J. F. Pothier & A. Patocchi

  2. Plant Pathology, IBZ, Swiss Federal Institute of Technology (ETH Zürich), Universitätstrasse 2, 8092, Zürich, Switzerland

    D. Socquet-Juglard & C. Gessler

  3. Conthey Research Centre, Fruit growing and breeding group, Research Station Agroscope Changins-Wädenswil (ACW), 1964, Conthey, Switzerland

    D. Christen

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  1. D. Socquet-Juglard
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Communicated by E. Dirlewanger

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Fig. S1

Linkage map of “Harostar.” Microsatellite markers are indicated in bold. Markers showing segregation distortion are indicated by significant distortion at *P < 0.05, **P < 0.01, ***P < 0.005, and ****P < 0.001. Loci of multilocus markers are indicated with letters(JPEG 321 kb)

High resolution image (TIFF 270 kb)

Fig. S2

Linkage map of “Rouge de Mauves.” Microsatellite markers are indicated in bold. Markers showing segregation distortion are indicated by significant distortion at *P < 0.05, **P < 0.01, and *** P < 0.005. Loci of multilocus markers are indicated with letters (PNG 134 kb)

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Socquet-Juglard, D., Duffy, B., Pothier, J.F. et al. Identification of a major QTL for Xanthomonas arboricola pv. pruni resistance in apricot. Tree Genetics & Genomes 9, 409–421 (2013). https://doi.org/10.1007/s11295-012-0562-z

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  • DOI: https://doi.org/10.1007/s11295-012-0562-z

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