Fig. 5

Seven groups of allelic chromosomes had similar genetic variation and exhibited negative correlation between nucleotide substitutions and indel frequencies. a, b: SNP and indel frequencies of all unigenes mapped to seven allelic chromosomes. c: The correlation between SNP and indel frequencies shown in panels (a) and (b). d-f: The relative SNP and indel frequencies of unigenes mapped to seven allelic chromosomes (d), chromosomes without introgressed fragment (e), and chromosomes with introgressed fragments (f). In a and b: The significance of difference was calculated with the the χ² test, and columns labelled with no same letter means the difference is significant (P < 0.05). In c, the correlation was calculated using the Pearson correlation analysis. In d-f, CV was coefficient of variation which was calculated as the ratio of standard deviation to mean