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

引用

Molecular Plant 2019年第1期12卷 30-43页

作者： Dezhi Wu Zhe Liang Tao Yan Ying Xu Lijie Xuan Juan Tang Gang Zhou Ulrike Lohwasser Shuijin Hua Haoyi Wang Xiaoyang Chen Qian Wang Le Zhu Antony Maodzeka Nazim Hussain Zhilan Li Xuming Li Imran Haider Shamsi Ghulam Jilani Linde Wu Hongkun Zheng Guoping Zhang boulos chalhoub Lisha Shen Hao Yu Lixi Jiang institute of Crop Science Zhejiang UniversityHangzhou 310058China Temasek Life Sciences Laboratory and Department of Biological Science National University of SingaporeSingapore 117543Singapore Biomarker Technologies Corporation Beijing 101300China Department of Genebank Leibniz institute of Plant Genetics and Crop Plant Research06466 Stadt SeelandGermany Institute of Crop and Nuclear Agricultural Sciences Zhejiang Academy of Agricultural SciencesHangzhou 310021China Office of Research Innovation & CommercializationPMAS-Arid Agricultural University Rawalpindi46300 RawalpindiPakistan Institute of Crop Science Jinhua Academy of Agncultural SciencesJinhua 321017China

Rapeseed (Brassica napus),an important oilseed crop,has adapted to diverse climate zones and latitudes by forming three main ecotype groups,namely winter,semiwinter,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 singlenucleotide 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,"*** 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 *** by calculating the genetic diversity and linkage disequilibrium ***-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.

关键词： Brassica napus genome resequencing selective sweep ecotype divergence GWAS floweringtime trait

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