Cytonuclear Interactions and Subgenome Dominance Shape the Evolution of Organelle-Targeted Genes in the Brassica Triangle of U

文献类型： 外文期刊

第一作者： Kan, Shenglong

作者： Kan, Shenglong;Kan, Shenglong;Liao, Xuezhu;Lan, Lan;Kong, Jiali;Wang, Jie;Nie, Liyun;Wu, Zhiqiang;Lan, Lan;Wang, Jie;Kong, Jiali;Zou, Jun;An, Hong

作者机构：

关键词： allopolyploidy; cytonuclear interactions; mitochondria; plastid; subgenome dominance; Brassica

期刊名称：MOLECULAR BIOLOGY AND EVOLUTION （ 影响因子：10.7； 五年影响因子：15.1 ）

ISSN： 0737-4038

年卷期： 2024 年 41 卷 3 期

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收录情况： SCI

摘要： The interaction and coevolution between nuclear and cytoplasmic genomes are one of the fundamental hallmarks of eukaryotic genome evolution and, 2 billion yr later, are still major contributors to the formation of new species. Although many studies have investigated the role of cytonuclear interactions following allopolyploidization, the relative magnitude of the effect of subgenome dominance versus cytonuclear interaction on genome evolution remains unclear. The Brassica triangle of U features 3 diploid species that together have formed 3 separate allotetraploid species on similar evolutionary timescales, providing an ideal system for understanding the contribution of the cytoplasmic donor to hybrid polyploid. Here, we investigated the evolutionary pattern of organelle-targeted genes in Brassica carinata (BBCC) and 2 varieties of Brassica juncea (AABB) at the whole-genome level, with particular focus on cytonuclear enzyme complexes. We found partial evidence that plastid-targeted genes experience selection to match plastid genomes, but no obvious corresponding signal in mitochondria-targeted genes from these 2 separately formed allopolyploids. Interestingly, selection acting on plastid genomes always reduced the retention rate of plastid-targeted genes encoded by the B subgenome, regardless of whether the Brassica nigra (BB) subgenome was contributed by the paternal or maternal progenitor. More broadly, this study illustrates the distinct selective pressures experienced by plastid- and mitochondria-targeted genes, despite a shared pattern of inheritance and natural history. Our study also highlights an important role for subgenome dominance in allopolyploid genome evolution, even in genes whose function depends on separately inherited molecules.

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