Abstract
Apple plants are self-incompatible because a genetic mechanism allows the female reproductive organ to recognize and reject self-pollen or pollen from genetic related individuals and allows non-self pollen to effect fertilization. Thus, there are implications to both breeding strategies and orchard management for fruit production. The purpose of this study was to identify and to characterize the S-RNase alleles of the gametophytic incompatibility among apple cultivars developed in Brazil, seeking to give support for choosing right combinations of parent in the apple breeding programs. It also sought to identify correct combinations of scion/pollinator cultivars of commercial apple orchards. A total of 16 specific S-RNase alleles primers were tested against DNA extracted from 12 Brazilian cultivars and their parents. The molecular analysis confronted to the reference cultivars, showed that the cultivars Daiane, Imperatriz and Princesa have the same incompatibility S3 and S5 alleles, while ‘Lisgala’ showed the alleles S2 and S5; ‘Suprema’, S1 and S9; ‘Catarina’, S1 and S19; ‘Joaquina’ and ‘Fred Hough’, S5 and S19; ‘Baronesa’, S3 and S9; ‘Duquesa’, S2 and S3. For ‘Primícia’ and ‘Condessa’ it was only possible to identify one of the S-alleles, namely S24 and S2, respectively, with the second allele remaining to be identified. Progeny test indicated the Mendelian inheritance for RNase alleles. Results of this study will be helpful to judiciously choose parents in apple breeding programs to improve compatibility.
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Acknowledgments
The authors thank the National Research Council (CNPq) UNISUL, and PRODETAB for a research grant. The Brazilian CNPq provided scholarships to RON and Brazilian agency CAPES to ACMD. The authors also would like to acknowledge the anonymous reviewers, which suggestions improved the quality of the manuscript.
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de Albuquerque, C.L., Denardi, F., de Mesquita Dantas, A.C. et al. The self-incompatible RNase S-alleles of Brazilian apple cultivars. Euphytica 181, 277–284 (2011). https://doi.org/10.1007/s10681-011-0431-0
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DOI: https://doi.org/10.1007/s10681-011-0431-0