“…The B. napus gene pool includes synthetic lines, which are produced from interspecific crossing between B. rapa and B. oleracea (Gaeta et al ., ), and is a source of novel genetic diversity (Cheung et al ., ; Gaeta et al ., ; Osborn et al ., ; Sharpe et al ., ), which is valuable for crop breeding. The meiotic chromosome pairing that occurs between homoeologous chromosomes which share a high degree of sequence identity leads to increased homoeologous exchanges (HEs) and gene conversion events (Gaeta and Chris Pires, ; Stein et al ., ), and synthetic B. napus has been shown to exhibit a higher frequency of HEs than nonsynthetic B. napus (Liu et al ., ; Rousseau‐Gueutin et al ., ; Sharpe et al ., ), making it an interesting model to study the impact of polyploidization on genome structure (Chalhoub et al ., ; Clarke et al ., ; Gaeta et al ., ; Nicolas et al ., ; Osborn et al ., ; Parkin et al ., ; Schmutzer et al ., ; Stein et al ., ; Szadkowski et al ., ; Udall et al ., ) and agronomic traits (Rousseau‐Gueutin et al ., ; Schiessl et al ., ; Stein et al ., ; Zou et al ., ).…”