Fig. 4

Effect of increased recombination rate for the introgression of a target locus in B. rapa. a Mean size of the heterozygous segment around the target locus in a cold recombinant region, in Mb, according to generations, in B.rapa. b Mean proportion of the donor genome, in percentage, according to generations. The insert represents a zoom on the last generations, from BC2 onwards. c Ratio of the mean proportion of the donor genome in the WT and of the corresponding proportion under Boost or HR according to generations. A value above 1 means that there is more remaining donor genome in the WT than under modified recombination (Boost or HR). d Mean proportion of the remaining donor genome that results from linkage drag, calculated as the part of the remaining donor genome that comes from the heterozygous segment around the target locus, according to generations. The measures in the WT are represented in black, those under Boost in red, and those under HR in green. Two selection schemes are shown: up to BC3S1, in solid lines, and up to BC4S1, in dashed lines. The generations BC3S1 and BC4 have the same position on the x axis. In the situations represented in this figure, the target locus is in a cold region, and there are 400 plants produced per generation. For the cross at each generation, the best individual is used, following the selection criterion appropriate for each generation (BC1 and BC2: foreground selection, and thereafter background selection). The error bars represent the confidence intervals at 95%