Fig. 5
Enrichment test of mutations related to solar-UV signature with population-private SNPs. a, b Compare the mutation frequency between landraces and wild accessions in maize and soybean, respectively, and the x coordinate of each point indicates the fold frequency difference (fPL(m) − fPW(m))/fPW(m). c, d Compare the mutation frequency between improved cultivars and wild accessions in maize and soybean, respectively, and the x coordinate of each point indicates the fold frequency difference (fPI(m) − fPW(m))/fPW(m). The y coordinate indicates Pearson’s χ2 value that measures the significance of the difference between fm(P1) and fm(P2). Outlier points are labeled with the ancestral state of the mutant nucleotide flanked by two neighboring bases, and the color of the points indicate the ancestral and derived alleles of the mutant site. The purple rectangle highlights the mutations related to solar-UV signature. Here, TCG on the plot represents mutation 5′-TCG-3′→5′-TTG-3′ and its reverse complement 5′-CGA-3′→5′-CAA-3′, CCG represents mutation 5′-CCG-3′→5′-CTG-3′ and its reverse complement 5′-CGG-3′→5′-CAG-3′, and similarly for all the other dots on the plot