We report the annotation and analysis of the draft genome sequence of Brassica rapa accession Chiifu-401-42, a Chinese cabbage. We modeled 41,174 protein coding genes in the B. rapa genome, which has undergone genome triplication. We used Arabidopsis thaliana as an outgroup for investigating the consequences of genome triplication, such as structural and functional evolution. The extent of gene loss (fractionation) among triplicated genome segments varies, with one of the three copies consistently retaining a disproportionately large fraction of the genes expected to have been present in its ancestor. Variation in the number of members of gene families present in the genome may contribute to the remarkable morphological plasticity of Brassica species. The B. rapa genome sequence provides an important resource for studying the evolution of polyploid genomes and underpins the genetic improvement of Brassica oil and vegetable crops.
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This work was primarily funded by the Chinese Ministry of Science and Technology, Ministry of Agriculture, Ministry of Finance, the National Natural Science Foundation of China. Other funding sources included: Core Research Budget of the Non-profit Governmental Research Institution; the European Union 7th Framework Project; funds from Shenzhen Municipal Government of China; the Danish Natural Science Research Council; National Academy of Agricultural Science and the Next-Generation Biogreen21 Program, Rural Development Administration, Korea; the Technology Development Program for Agriculture and Forestry, Ministry for Food, Agriculture, Forestry and Fisheries, Korea; United Kingdom's Biotechnology and Biological Sciences Research Council; Institute National de la Recherche Agronomique, France; Japanese Kazusa DNA Research Institute Foundation; National Science Foundation, USA; Bielefeld University, Germany; the Australian Research Council; the Australian Grains Research and Development Corporation; Agriculture and Agri-Food Canada; and the National Research Council of Canada's Plant Biotechnology Institute. See the Supplementary Note for a full list of support and acknowledgments.
The authors declare no competing financial interests.
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The Brassica rapa Genome Sequencing Project Consortium., Wang, X., Wang, H. et al. The genome of the mesopolyploid crop species Brassica rapa. Nat Genet 43, 1035–1039 (2011). https://doi.org/10.1038/ng.919
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