Fig. 1

Principal component analyses (PCAs) for two diverse panels of autotetraploid species. We called genotypes using VCF2SM with ploidy level of four. PCA was carried out for 135,193 and 74,790 loci for diverse panels of 83 potato cultivars (a) and 189 alfalfa accessions (b), respectively. a There were four groups and an additional diploidized potato (‘Phureja’) previously identified [23]. b Only genotypes from Afghanistan were somehow grouped. Red, green and blue arrows indicate the same genotypes (‘wilson’, ‘saranac_G’ and ‘rambler’, respectively) highlighted in [24]