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Nat Commun. 2019 Mar 11;10(1):1154. doi: 10.1038/s41467-019-09134-9.

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

Lu K1,2,3, Wei L1,2, Li X4, Wang Y4, Wu J5, Liu M1, Zhang C1, Chen Z1, Xiao Z1, Jian H1, Cheng F5, Zhang K1, Du H1,2,3, Cheng X3, Qu C1,2,3, Qian W1,2,3, Liu L1,2,3, Wang R1,2,3, Zou Q1, Ying J1, Xu X1,2, Mei J1,2, Liang Y1,2,3, Chai YR1,2,3, Tang Z1,2,3, Wan H1, Ni Y1,2,3, He Y1, Lin N1, Fan Y1, Sun W1, Li NN2, Zhou G4, Zheng H4, Wang X6, Paterson AH7, Li J8,9,10.

Author information

1
College of Agronomy and Biotechnology, Southwest University, Beibei, 400715, Chongqing, China.
2
Academy of Agricultural Sciences, Southwest University, Beibei, 400715, Chongqing, China.
3
State Cultivation Base of Crop Stress Biology for Southern Mountainous Land of Southwest University, Beibei, 400715, Chongqing, China.
4
Biomarker Technologies Corporation, 101300, Beijing, China.
5
Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, 100081, Beijing, China.
6
Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, 100081, Beijing, China. wangxw@mail.caas.net.cn.
7
Plant Genome Mapping Laboratory, University of Georgia, Athens, Georgia, 30605, USA. paterson@uga.edu.
8
College of Agronomy and Biotechnology, Southwest University, Beibei, 400715, Chongqing, China. ljn1950@swu.edu.cn.
9
Academy of Agricultural Sciences, Southwest University, Beibei, 400715, Chongqing, China. ljn1950@swu.edu.cn.
10
State Cultivation Base of Crop Stress Biology for Southern Mountainous Land of Southwest University, Beibei, 400715, Chongqing, China. ljn1950@swu.edu.cn.

Abstract

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 the species, whereas asymmetrical subgenomic selection has led to ecotype change. By integrating genome-wide association studies, selection signals, and transcriptome analyses, we identify genes associated with improved stress tolerance, oil content, seed quality, and ecotype improvement. They are candidates for further functional characterization and genetic improvement of B. napus.

PMID:
30858362
PMCID:
PMC6411957
DOI:
10.1038/s41467-019-09134-9
[Indexed for MEDLINE]
Free PMC Article

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