Whole-genome resequencing reveals Brassica napus origin and genetic loci involved in its improvement

Brassica napus (2n = 4x = 38, AACC) is an important allopolyploid crop derived from interspecific crosses between Brassica rapa (2n = 2x = 20, AA) and Brassica oleracea (2n = 2x = 18, CC). However, no truly wild B. napus populations are known; its origin and improvement processes remain unclear. Here, we resequence 588 B. napus accessions. We uncover that the A subgenome may evolve from the ancestor of European turnip and the C subgenome may evolve from the common ancestor of kohlrabi, cauliflower, broccoli, and Chinese kale. Additionally, winter oilseed may be the original form of B. napus. Subgenome-specific selection of defense-response genes has contributed to environmental adaptation after formation of…

• NS
  National Science Foundation
• NN
  National Natural Science Foundation of China

  Awards: 2016YFD0101007, 31871653, 31830067, 2015CB150201, 31830067, U1302266, U1302266, 31571701, B12006
• NS
  Natural Science Foundation of Chongqing

  Award: cstc2018jcyjA1219
• HE
  Higher Education Discipline Innovation Project

  Award: B12006