Contribution of homoeologous exchange to domestication of polyploid Brassica

文献类型： 外文期刊

第一作者： Wang, Tianpeng

作者： Wang, Tianpeng;Zhao, Ranze;Wang, Xiaowu;Wang, Tianpeng;Bonnema, Guusje;Wang, Tianpeng;van Dijk, Aalt D. J.

作者机构：

期刊名称：GENOME BIOLOGY （ 影响因子：10.1； 五年影响因子：16.5 ）

ISSN： 1474-760X

年卷期： 2024 年 25 卷 1 期

页码：

收录情况： SCI

摘要： BackgroundPolyploidy is widely recognized as a significant evolutionary force in the plant kingdom, contributing to the diversification of plants. One of the notable features of allopolyploidy is the occurrence of homoeologous exchange (HE) events between the subgenomes, causing changes in genomic composition, gene expression, and phenotypic variations. However, the role of HE in plant adaptation and domestication remains unclear. ResultsHere we analyze the whole-genome resequencing data from Brassica napus accessions representing the different morphotypes and ecotypes, to investigate the role of HE in domestication. Our findings demonstrate frequent occurrence of HEs in Brassica napus, with substantial HE patterns shared across populations, indicating their potential role in promoting crop domestication. HE events are asymmetric, with the A genome more frequently replacing C genome segments. These events show a preference for specific genomic regions and vary among populations. We also identify candidate genes in HE regions specific to certain populations, which likely contribute to flowering-time diversification across diverse morphotypes and ecotypes. In addition, we assemble a new genome of a swede accession, confirming the HE signals on the genome and their potential involvement in root tuber development. By analyzing HE in another allopolyploid species, Brassica juncea, we characterize a potential broader role of HE in allopolyploid crop domestication. ConclusionsOur results provide novel insights into the domestication of polyploid Brassica species and highlight homoeologous exchange as a crucial mechanism for generating variations that are selected for crop improvement in polyploid species.

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