Fig 4. Circos diagram comparing the recombination rates along the 10 A chromosomes in cM per Mbp between the AA and AAC F₁ hybrids.

In the first outer circle are represented the 10 A chromosomes of the B. rapa cv. ‘Chiifu-401’ genome sequence version 1.5 [57]. Their sizes are indicated by the values in megabase pairs above each chromosome, and a ruler drawn underneath each chromosome, with larger and smaller tick marks every 10 and 2 Mbp, respectively. In the second outer circle, is detailed the architecture of each A chromosome, including the genes and transposable elements (TEs) densities from the version 1.5 of the B. rapa cv. ‘Chiifu-401’ genome sequence [57]. The active centromeres are delimited in black using the positions established by Mason et al. [81]. In the third outer circle, are indicated the positions of the 204 SNP markers used for the genotyping of the progenies of each AA and AAC F₁ hybrid. In the three inner circles, are represented the pair-wise comparisons for the recombination landscapes (in cM per Mb) of progenies deriving from the AA and AAC F₁ hybrids. Toward the Circos diagram center, are compared (i) the A_rA_r’ (purple lines) and A_rA_r’C_o (light purple lines) female hybrids, (ii) the A_nA_r’ (red lines) and A_nA_r’C_n (pink lines) female hybrids, and (iii) the A_nA_r’ (blue lines) and A_nA_r’C_n (light blue lines) male hybrids. For each interval between adjacent SNP markers, the heterogeneity of CO rates was assessed using Chi-squared tests and significant differences at a threshold of 5% were indicated for each pair-wise comparison between AA and AAC F₁ hybrids in grey.