Principal coordinate analysis of 205 tetraploid potato genotypes. Principal coordinate analysis was performed using the SSR genotyping data. The common varieties are represented with black dots. Breeding clones are referred to by the corresponding breeder abreviation. Berding (BE), Europlant (EU), Bavaria Saat (BS), Niehoff (NE), Norika (NO), SaKa (SA) and the corresponding symbol.