Abstract
Cacopsylla pyri (pear psylla) is one of the most serious pests of pear (Pyrus spp.) in Europe. It can cause high yield losses, and its control has become difficult since it has developed resistance to a wide range of pesticides. Pear breeders are developing new cultivars resistant to pear psyllids, and Asian species, such as Pyrus ussuriensis and Pyrus × bretschneideri, are good sources of resistance. Antixenosis and antibiosis resistance to psylla were both identified in pear; they may differ in the biological mechanism and probably have different genetic backgrounds. We crossed interspecific P. × bretschneideri × Pyrus communis hybrid PEAR3, resistant to pear psylla, with the susceptible European pear cultivar ‘Moonglow’ to obtain an F1 population for the genetic mapping of the resistance. Quantitative trait locus (QTL) analysis was carried out for antibiosis by measuring the number of surviving nymphs and the nymphal development, using a novel phenotyping protocol and a saturated genetic map made of single-nucleotide polymorphism (SNP) and microsatellite (simple sequence repeats (SSR)) markers. A stable QTL was detected on linkage group (LG) 8 of PEAR3 (R 2 = 17.2–39.1 %). In addition, QTLs were detected on LG5 (R 2 = 10.8 %) of PEAR3 and on LG15 of ‘Moonglow’ (R 2 = 13.7 %).
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Acknowledgments
SM was funded by the Fondazione Edmund Mach (FEM) PhD School. We greatly thank Déborah Renault, Jasmine McCarthy, Ferreol Braud, Sophie Aligon, Medhi Al-Rifai, Clement Joffrion, Sylvain Hanteville, Valérie Le Mignon, Arnaud Guyader, and Christine Boursier (UMR1345 IRHS, Angers, France) for their precious help in the scoring on C. pyri eggs and nymphs. We also thank Lester Brewer at PFR for generating the PEAR3 × ‘Moonglow’ cross and the INEM team of IRHS, especially Michel Boucourt, and the INRA Experimental Unit (UE Horti, Angers, France), especially Christian Cattanéo, for taking care of the seedling population.
Data archiving statement
QTL data are reported in Table 4 and will be made publicly available through the Genome Database for Rosaceae (www.rosaceae.org).
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Communicated by E. Dirlewanger
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ESM_1
Psylla resistance phenotypic data distributions in a segregating interspecific pear population in 2013 and 2014. (PDF 189 kb)
ESM_2
Distribution of the phenotypic means of psylla resistance adjusted for environmental factors in a pear segregating population in 2013 and 2014. (PDF 321 kb)
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Montanari, S., Guérif, P., Ravon, E. et al. Genetic mapping of Cacopsylla pyri resistance in an interspecific pear (Pyrus spp.) population. Tree Genetics & Genomes 11, 74 (2015). https://doi.org/10.1007/s11295-015-0901-y
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DOI: https://doi.org/10.1007/s11295-015-0901-y