Abstract
European pear, as well as its close relatives Japanese pear and apple, exhibits S-RNase-based gametophytic self-incompatibility. The male determinant of this self-incompatibility mechanism is a pollen-expressed protein containing an F-box domain; in the genera Petunia (Solanaceae), Antirrhinum (Plantaginaceae), and Prunus (Rosaceae), a single F-box gene determines the pollen S. In apple and Japanese pear, however, multiple S-locus F-box genes were recently identified as candidates for the pollen S, and they were named S-locus F-Box Brothers. These genes were considered good candidates for the pollen S determinant since they exhibit S-haplotype-specific polymorphisms, pollen-specific expression, and linkage to the S-RNase. In the present study, S-locus F-Box Brothers homologs have been cloned from two of the most agronomically important European pear varieties, “Abbé Fétel” (S104-2/S105) and “Max Red Bartlett” (S101/S102), and they have been mapped on a genetic linkage map developed on their progeny. Our results suggest that the number of F-box genes linked to the S-locus of the European pear is higher than expected according with previous reports for apple and Japanese pear, since up to five genes were found to be linked to a single S-haplotype. Moreover, two of these genes exhibited an incomplete linkage to the S-RNase, allowing the identification of low-frequency recombinant haplotypes, generated by a crossing-over event between the two genes. These F-box genes are most likely placed in close proximity of the S-locus but do not belong to it, and they can thus be excluded from being responsible for the determination of pollen S function.
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Acknowledgments
This work was supported by the PRIN project (MIUR, Rome) 2007 “The productive process in fruit tree species: molecular, physiological and agronomical aspects of floral incompatibility and strategies for its control” and “Ministerio de Ciencia e Innovación de España”—EU-FEDER (project grant CICYT AGL2009-12621-C02-02). J.S. acknowledges the “Instituto de Investigación y Tecnología Agroalimentaria”—INIA_CCAA program and the “Ministerio de Ciencia e Innovación de España”—I3 program for financial support.
Ethical standards and conflict of interest declaration
The authors declare that all the experiments comply with the current laws of the country in which they were performed (Italy, Spain) and that they have no conflict of interests.
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De Franceschi, P., Pierantoni, L., Dondini, L. et al. Cloning and mapping multiple S-locus F-box genes in European pear (Pyrus communis L.). Tree Genetics & Genomes 7, 231–240 (2011). https://doi.org/10.1007/s11295-010-0327-5
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DOI: https://doi.org/10.1007/s11295-010-0327-5