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Objective  The proposed candidate gene underlying the  Malus fusca  fire blight resistance locus on chromosome 10 was previously predicted to possess 880 amino acids and 8 exons. Eight base pair (8 bp) insertion/deletion in the first exon potentially distinguished resistant genotypes from susceptible ones. This study aimed at analyzing the candidate gene sequence in another set of original resistant and susceptible progeny, characterizing the sequence in a transgenic line transformed with the candidate gene under its own native promoter, as well as deciphering the potential genomic differences between this candidate gene and its homolog in the ‘Golden Delicious’ doubled haploid genome (GDDH13).    Results  Sequences of amplicons of part of the candidate gene amplified in two progenies that showed resistant and susceptible fire blight phenotypes, confirmed the 8 bp insertion that distinguishes susceptible and resistant progenies. The transgenic line was positive for the candidate gene sequence, confirming a successful transfer into the background of apple cultivar ‘Pinova’, and possessed the same genomic sequence as the progeny with a resistant phenotype. Sequence analysis showed that the homolog gene on GDDH13 possesses a significant 18 bp deletion in exon 1 leading to a difference of 15 amino acid from the protein sequence of the candidate gene.    Supplementary Information  The online version contains supplementary material available at 10.1186/s13104-021-05709-2.

Characterization of genomic DNA sequence of the candidate gene for FB_Mfu10 associated with fire blight resistance in Malus species