Abstract
Scab is one of the major fungal diseases infecting pear trees, causing the greatest economic losses. Identifying and pyramiding scab resistance factors should help in breeding new resistant pear cultivars. We have identified and mapped two new pear resistance loci against the fungal pathogen Venturia pirina. The first locus, mapped both as a major gene and as a QTL, is located on linkage group (LG) 01 of the hybrid P3480, deriving from the European pear cultivar ‘Wilder.’ It colocalizes with the Vnk resistance gene found in the Asian pear cultivar ‘Kinchaku’ against Venturia nashicola. A second locus, mapped as a QTL, is located on LG04 of the interspecific cultivar ‘Euras.’ In a small ‘Euras’ × P3480 progeny, seven seedlings carrying the resistant alleles at both loci have been selected using SSR markers.
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Acknowledgments
This work was supported by the University of Angers with the young researcher SyntéPoirPom project. The authors thank Hélène Muranty for her critical review of the manuscript. They also thank Charles Poncet for the technical assistance delivered by the platform Gentyane of high-throughput genotyping of Clermont-Theix, Laurence Hibrand-Saint Oyant for the technical assistance delivered by the ANAN technical platform of the SFR QUASAV (Structure Fédérative de Recherche 4207 QUASAV), the INRA Horticultural Experimental Unit 0449 and the IRHS team in charge of the greenhouse management (INEM platform), and particularly, Michel Boucourt and Nicolas Dousset.
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Data archiving statement
QTL and markers data will be made publicly available through the Genome Database for Rosaceae (www.rosaceae.org).
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ESM_1:
Markers used for genetic mapping in A × P3480 and E × P2896 progenies. (DOCX 15 kb)
ESM_2:
Primer sequences of four new SSR markers located on linkage group 1 of the pear genome and used to genotype the F1 segregating population deriving from the cross ‘Angélys’ × P3480. (DOCX 12 kb)
ESM_3:
LOD plot for the quantitative trait loci (QTLs) detected for scab resistance (sporulation severity), named qrvp-LG01 and qrvp-LG04, in the F1 segregating population deriving from the cross ‘Euras’ × P3480 (DOCX 39 kb)
ESM_4:
Diagram exhibiting the mean values of the sporulation severity for the four genotypic classes (ac, ad, bc, bd) defined when combining the two alleles of the two SSR markers TsuGNH076 and SAmsCO865608 (respectively, a/b and c/d) for the parental genotypes ‘Euras’ and P3480 in their deriving F1 progeny. (DOCX 13 kb)
ESM_5:
Resistance genes and quantitative trait loci (QTLs) found in European and Asian pears in response to Venturia pirina and Venturia nashicola (DOCX 12 kb)
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Perchepied, L., Leforestier, D., Ravon, E. et al. Genetic mapping and pyramiding of two new pear scab resistance QTLs. Mol Breeding 35, 197 (2015). https://doi.org/10.1007/s11032-015-0391-5
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DOI: https://doi.org/10.1007/s11032-015-0391-5