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. 2017 Feb 15;8:138. doi: 10.3389/fpls.2017.00138

FIGURE 2.

FIGURE 2

Single nucleotide polymorphism density and distribution across the 12 chromosomes of the tomato genome and across species. (A) SNP density across the 12 chromosomes of the tomato genome, obtained after aligning 3,974 SNP markers found in 67 accessions of Galapagos tomatoes, two S. lycopersicum varieties and one S. pimpinellifolium accession with DArTseq, plotted with ggplot2 package in R. The x-axis represents the SNP position along each chromosome (bp). The y-axis shows SNP density over the range of the SNP position. Note high SNP density at the edges of the chromosomes. (B) Venn diagram of unique and shared SNPs, kept in each dataset after SNP filtering. In this case, the minor allele frequency test was excluded for S. lycopersicum due to the small sample of lines available in this study and their low allele diversity. The diagram was drawn from the SNP lists of each species using the InteractiVenn website (Heberle et al., 2015).