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Whole-Genome Resequencing of a Worldwide Collection of Rapeseed Accessions Reveals the Genetic Basis of Ecotype Divergence

Open access
Wu, Dezhi, Liang, Zhe, Yan, Tao, Xu, Ying, Xuan, Lijie, Tang, Juan, Zhou, Gang, Lohwasser, Ulrike, Hua, Shuijin, Wang, Haoyi, Chen, Xiaoyang, Wang, Qian, Zhu, Le, Maodzeka, Antony, Hussain, Nazim, Li, Zhilan, Li, Xuming, Shamsi, Imran Haider, Jilani, Ghulam, Wu, Linde, Zheng, Hongkun, Zhang, Guoping, Chalhoub, Boulos, Shen, Lisha, Yu, Hao, Jiang, Lixi·2019·Molecular Plant

Abstract

Rapeseed (Brassica napus), an important oilseed crop, has adapted to diverse climate zones and latitudes by forming three main ecotype groups, namely winter, semi-winter, and spring types. However, genetic variations underlying the divergence of these ecotypes are largely unknown. Here, we report the global pattern of genetic polymorphisms in rapeseed determined by resequencing a worldwide collection of 991 germplasm accessions. A total of 5.56 and 5.53 million single-nucleotide polymorphisms (SNPs) as well as 1.86 and 1.92 million InDels were identified by mapping reads to the reference genomes of "Darmor-bzh" and "Tapidor," respectively. We generated a map of allelic drift paths that shows splits and mixtures of the main populations, and revealed an asymmetric evolution of the two subgenomes of B. napus by calculating the genetic diversity and linkage disequilibrium parameters. Selective-sweep analysis revealed genetic changes in genes orthologous to those regulating various aspects of plant development and response to stresses. A genome-wide association study identified SNPs in the promoter regions of FLOWERING LOCUS T and FLOWERING LOCUS C orthologs that corresponded to the different rapeseed ecotype groups. Our study provides important insights into the genomic footprints of rapeseed evolution and flowering-time divergence among three ecotype groups, and will facilitate screening of molecular markers for accelerating rapeseed breeding.

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Metadata

Authors
Wu, D., Liang, Z., Yan, T., Xu, Y., Xuan, L., Tang, J., Zhou, G., Lohwasser, U., Hua, S., Wang, H., Chen, X., Wang, Q., Zhu, L., Maodzeka, A., Hussain, N., Li, Z., Li, X., Shamsi, I. H., Jilani, G., Wu, L., Zheng, H., Zhang, G., Chalhoub, B., Shen, L., Yu, H., & Jiang, L.
Venue
Molecular Plant
Publisher
Elsevier BV
Published
2019-01
Volume
12
Issue
1
Pages
30-43
ISSN
1674-2052 (ISSN-L)
OpenAlex
W2900491351
Cited by
265
References
53
FWCI
15.96
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Whole-Genome Resequencing of a Worldwide Collection of Rapeseed Accessions Reveals the Genetic Basis of Ecotype Divergence. https://app.cochat.ai/papers/10.1016/j.molp.2018.11.007
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Wu, D., Liang, Z., Yan, T., Xu, Y., Xuan, L., Tang, J., Zhou, G., Lohwasser, U., Hua, S., Wang, H., Chen, X., Wang, Q., Zhu, L., Maodzeka, A., Hussain, N., Li, Z., Li, X., Shamsi, I. H., Jilani, G., . . . Jiang, L. (2019). Whole-Genome Resequencing of a Worldwide Collection of Rapeseed Accessions Reveals the Genetic Basis of Ecotype Divergence. Molecular Plant. https://doi.org/10.1016/j.molp.2018.11.007

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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