| INTRODUC TI ONRapeseed/canola (Brassica napus L.) is one of the most important oilseed crops in the world and second to soybean (Foreign Agriculture Services, United States Department of Agriculture, National Agricultural Statistics Service, 2019). It is an amphidiploid (AACC, 2n = 4x = 38) and evolved through spontaneous interspecific hybridization followed by genome duplication, chromosome fission, fusion and rearrangements between two diploid species, B. rapa L. (AA, 2n = 2x = 20) and B. oleracea L. (CC, 2n = 2x = 18)

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The cover image is based on the Original Article Genome‐wide association study for frost tolerance in rapeseed/canola (Brassica napus) under simulating freezing conditions by Wrucke et al., https://doi.org/10.1111/pbr.12771.