数字农科院2.0

Comparison Of The Cytoplastic Genomes By Resequencing: Insights Into The Genetic Diversity And The Phylogeny Of The Agriculturally Important Genus Brassica

文献类型： 外文期刊

作者： Qiao, JW; Zhang, XJ; Chen, BY; Huang, F; Xu, K; Huang, Q; Huang, Y; Hu, Q; Wu, XM

作者机构：

关键词： Brassica; Rapeseed; Cytoplasmic Dna; Maternal Origin; Evolutionary Relationship; Cytoplasmic Male Sterility

期刊名称： BMC GENOMICS

ISSN： 1471-2164

年卷期： 2020 年 21 卷 1 期

页码：

收录情况： JCR（2021版）

摘要： BackgroundThe genus Brassica mainly comprises three diploid and three recently derived allotetraploid species, most of which are highly important vegetable, oil or ornamental crops cultivated worldwide. Despite being extensively studied, the origination of B. napus and certain detailed interspecific relationships within Brassica genus remains undetermined and somewhere confused. In the current high-throughput sequencing era, a systemic comparative genomic study based on a large population is necessary and would be crucial to resolve these questions.ResultsThe chloroplast DNA and mitochondrial DNA were synchronously resequenced in a selected set of Brassica materials, which contain 72 accessions and maximally integrated the known Brassica species. The Brassica genomewide cpDNA and mtDNA variations have been identified. Detailed phylogenetic relationships inside and around Brassica genus have been delineated by the cpDNA- and mtDNA- variation derived phylogenies. Different from B. juncea and B. carinata, the natural B. napus contains three major cytoplasmic haplotypes: the cam-type which directly inherited from B. rapa, polima-type which is close to cam-type as a sister, and the mysterious but predominant nap-type. Certain sparse C-genome wild species might have primarily contributed the nap-type cytoplasm and the corresponding C subgenome to B. napus, implied by their con-clustering in both phylogenies. The strictly concurrent inheritance of mtDNA and cpDNA were dramatically disturbed in the B. napus cytoplasmic male sterile lines (e.g., mori and nsa). The genera Raphanus, Sinapis, Eruca, Moricandia show a strong parallel evolutional relationships with Brassica.ConclusionsThe overall variation data and elaborated phylogenetic relationships provide further insights into genetic understanding of Brassica, which can substantially facilitate the development of novel Brassica germplasms.

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