One original example of increased recombination comes from allo-triploid hybrids derived from the cross between turnip ( I Brassica rapa i ; 2n = 2x = 20; AA genome) and oilseed rape ( I Brassica napus i ; 2n = 4x = 38; AACC genome). Genetic mapping of the resistance genes revealed that some chromosomes (5A, 6B) carry clusters of genes. They opened promising original perspectives for using the site-specific properties of genome-editing technologies (CRISPR/Cas9) to target meiotic recombination at specific chromosomal regions, which would allow the breaking of tight linkage between genes of agronomical interest and undesirable traits. In allopolyploid species such as bread wheat or oilseed rape ( I Brassica napus i ), recombination between highly similar but not homologous (called therefore homoeologous), related chromosomes, is also highly controlled, preventing easy introduction of genes derived from wild relatives [[13]]. [Extracted from the article]