Extensive crop-wild hybridization during Brassica evolution and selection during the domestication and diversification of Brassica crops.
Extensive crop-wild hybridization during Brassica evolution and selection during the domestication and diversification of Brassica crops.
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DOI：
10.1093/genetics/iyad027
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发表时间：
2023-04-06
期刊：
影响因子：
3.3
通讯作者：
Chapman, Mark A.
中科院分区：
文献类型：
--
作者：
Saban, Jasmine M.;Romero, Anne J.;Ezard, Thomas H. G.;Chapman, Mark A.
作物野生近缘种的适应性遗传多样性可以用来开发具有更高产量和适应性的改良作物，如果解决作物和它们的野生近缘种之间的系统发育关系。这进一步允许全基因组渗入的准确定量和选择下基因组区域的确定。使用广泛的采样CWRs和全基因组测序，我们进一步证明了两个经济上有价值的和形态多样的芸苔属作物物种，他们的CWRs，和他们假定的野生祖先之间的关系。结果表明，甘蓝型油菜与芸苔属作物之间存在着复杂的亲缘关系和广泛的基因组渗入。一些野生甘蓝种群具有混合野生起源;两种作物物种中的一些驯化类群具有杂交起源，而野生芜菁在遗传上与芜菁无明显区别。我们揭示的广泛的基因组渐渗可能会导致在驯化过程中使用传统的比较方法的选择签名的错误识别，因此，我们采用了单种群的方法来研究驯化过程中的选择。我们利用这一点来探索两个作物组中平行表型选择的例子，并突出有前途的候选基因，以供将来研究。我们的分析定义了芸苔属作物及其不同的CWRs之间复杂的遗传关系，揭示了广泛的跨物种基因流与作物驯化和进化多样化的影响更普遍。
Adaptive genetic diversity in crop wild relatives (CWRs) can be exploited to develop improved crops with higher yield and resilience if phylogenetic relationships between crops and their CWRs are resolved. This further allows accurate quantification of genome-wide introgression and determination of regions of the genome under selection. Using broad sampling of CWRs and whole genome sequencing, we further demonstrate the relationships among two economically valuable and morphologically diverse Brassica crop species, their CWRs, and their putative wild progenitors. Complex genetic relationships and extensive genomic introgression between CWRs and Brassica crops were revealed. Some wild Brassica oleracea populations have admixed feral origins; some domesticated taxa in both crop species are of hybrid origin, while wild Brassica rapa is genetically indistinct from turnips. The extensive genomic introgression that we reveal could result in false identification of selection signatures during domestication using traditional comparative approaches used previously; therefore, we adopted a single-population approach to study selection during domestication. We used this to explore examples of parallel phenotypic selection in the two crop groups and highlight promising candidate genes for future investigation. Our analysis defines the complex genetic relationships between Brassica crops and their diverse CWRs, revealing extensive cross-species gene flow with implications for both crop domestication and evolutionary diversification more generally.
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影响因子：
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