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Background  Domestication and selection of  Vitis vinifera  L. for table and wine grapes has led to a large level of berry size diversity in current grapevine cultivars. Identifying the genetic basis for this natural variation is paramount both for breeding programs and for elucidating which genes contributed to crop evolution during domestication and selection processes. The gene  VvNAC26 , which encodes a NAC domain-containing transcription factor, has been related to the early development of grapevine flowers and berries. It was selected as candidate gene for an association study to elucidate its possible participation in the natural variation of reproductive traits in cultivated grapevine.    Methods  A grapevine collection of 114 varieties was characterized during three consecutive seasons for different berry and bunch traits. The promoter and coding regions of VvNAC26 gene (VIT_01s0026g02710) were sequenced in all the varieties of the collection, and the existing polymorphisms (SNP and INDEL) were detected. The corresponding haplotypes were inferred and used for a phylogenetic analysis. The possible associations between genotypic and phenotypic data were analyzed independently for each season data, using different models and significance thresholds.    Results  A total of 30 non-rare polymorphisms were detected in the VvNAC26 sequence, and 26 different haplotypes were inferred. Phylogenetic analysis revealed their clustering in two major haplogroups with marked phenotypic differences in berry size between varieties harboring haplogroup-specific alleles. After correcting the statistical models for the effect of the population genetic stratification, we found a set of polymorphisms associated with berry size explaining between 8.4 and 21.7 % (R 2 ) of trait variance, including those generating the differentiation between both haplogroups. Haplotypes built from only three polymorphisms (minihaplotypes) were also associated with this trait (R 2 : 17.5 – 26.6 %), supporting the involvement of this gene in the natural variation for berry size.    Conclusions  Our results suggest the participation of  VvNAC26  in the determination of the grape berry final size. Different  VvNAC26  polymorphisms and their combination showed to be associated with different features of the fruit. The phylogenetic relationships between the  VvNAC26  haplotypes and the association results indicate that this nucleotide variation may have contributed to the differentiation between table and wine grapes.    Electronic supplementary material  The online version of this article (doi:10.1186/s12870-015-0622-2) contains supplementary material, which is available to authorized users.

Polymorphisms and minihaplotypes in the VvNAC26 gene associate with berry size variation in grapevine