Abstract
The purpose of this study was to identify and characterize the S-alleles of gametophytic incompatibility among apple cultivars developed in Brazil, to give support to correctly choose the combinations of parents in the apple breeding programs. It also seeks to identify correct combinations of scion/pollinator cultivars of commercial apples. For the molecular characterization, 16 specific S-alleles primers were tested. The molecular analysis confronted to the reference cultivars, showed that the cultivars 'Daiane', 'Imperatriz' and 'Princesa' have the same incompatibility alleles S3 and S5, 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; and for 'Primicia' and 'Condessa' it was only possible to identify one of the S-alleles, namely S24 and S2, respectively, the second allele remaining to be identified.
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