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Fig. 1 | Molecular Horticulture

Fig. 1

From: Resequencing and genome-wide association studies of autotetraploid potato

Fig. 1

Phylogeny and population structure analysis revealed that CIP accessions are typical cultivated autotetraploid potato. A Neighbor-joining tree of all 170 accessions (108 CIP and 62 reported accessions) constructed from random selected 72,923 SNPs from sliding 10-kb window of potato genome showed that analyzed species are mainly divided into Wild, Outgroup, Landrace and Cultivar categories and the CIP accessions belong to Cultivar category. The line colors indicate groups of potato accessions. B Principal component analysis (PCA) revealed that CIP accessions and reported Cultivar are clustered. PC1 mainly divides Wild, Landrace and Cultivar while PC2 mainly divides Landrace, CIP, Outgroup and Wild accessions. C Population structure of 170 accessions by ADMIXTURE showed that 108 CIP accessions belong to Cultivar population. The K values represent the number of clusters. When K = 2, the population were divided into two distinct clusters (Wild species and CIP ones, red and blue respectively); K = 3, the population were divided into Wild (red), Landrace (yellow) and CIP species (blue); K = 4, the population were divided into Wild (red), Landrace (yellow) and Cultivar [including 18 reported North American Cultivars (purple) and CIP species (blue)]; K = 5 to K = 7, reported cultivars were classified into subgroups (green and light blue), the sophisticated genetic structure and missed individuals were shown in CIP cultivars (purple and blue). Each color represents one ancestral population, and each accession is represented by a bar. Length of each colored segment represents the proportion contributed by that ancestral population

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