Fig. 2.

SNPs detected through double-digest restriction-site-associated DNA sequencing: a Distribution of 21,020 SNPs across the 12 tomato chromosomes. The number of SNPs is represented within a 1 Mb window size. The horizontal axis shows the chromosome (Chr) length (Mb); each bar represents a chromosome, with Chr 1 at the top and Chr 12 at the bottom. The different colors depict SNP density following the gradient in the legend on the right; b bar chart illustrating the overall number of SNP markers on each chromosome; c bar chart showing the average polymorphic information content (PIC) for each chromosome; d heterozygosity level for SNP markers in the 12 chromosomes