Origin of the 207 apricot accessions classified into 11 apricot groups and three regions: A, B and C as defined according to their spatial and genetic proximity. Algerian, Moroccan and Tunisian apricots were sampled in situ. The remaining accessions originated from an ex situ collection (see Additional file 2: Table S2). Region A = Iran and Turkey; Region B = Continental Europe, southern France and southern Italy; Region C = Murcia, northern Tunisia, Moulouya Valley, Messaad, Oases of Tunisia and Draa Valley. Colours correspond to genetic clusters defined by STRUCTURE analysis with cluster 1 in blue, cluster 2 in green, cluster 3 in yellow and cluster 4 in red.