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第一作者:Yongshuai Sun
第一单位:中科院西双版纳热带植物园
通讯作者:Yongshuai Sun
Abstract
背景回顾:Hybridization can drive speciation.
主要研究:We examine the hypothesis that Castanea henryi var. omeiensis is an evolutionary lineage that originated from hybridization between two near-sympatric diploid taxa, C. henryi var. henryi and C. mollissima.
基础~板栗基因组:We produce a high-quality genome assembly for mollissima and characterize evolutionary relationships among related chestnut taxa.
研究结果:Our results show that C. henryi var. omeiensis has a mosaic genome but has accumulated divergence in all 12 chromosomes. We observe positive correlation between admixture proportions and recombination rates across the genome. Candidate barrier genomic regions, which isolate var. henryi and mollissima, are re-assorted in the hybrid lineage. We further find that the putative barrier segments concentrate in genomic regions with less recombination, suggesting that interaction between natural selection and recombination shapes the evolution of hybrid genomes during hybrid speciation.
结论:This study highlights that reassortment of parental barriers is an important mechanism in generating biodiversity.
摘 要
杂交可以驱动物种形成。本文中,作者检验了有关峨眉锥栗是起源于两个近同胞二倍体物种,锥栗与板栗之间的杂交的假说。作者构建了板栗的高质量基因组组装,并研究了板栗近缘类群之间的演化关系。结果表明,峨眉锥栗的基因组具有“马赛克”的特征,但在所有12条染色体上都积累了分化特征。作者发现整个基因组上的遗传混杂比例与重组率存在正相关的关系。候选的基因屏障区域,即可区分锥栗与板栗的基因组区域,在杂交支系中被重新分类。作者进一步发现了可能的屏障片段主要存在于重组较少的基因组区域,说明自然选择与重组之间的互作在杂交物种形成时塑造了杂交基因组的演化。本文的研究揭示了亲本杂交障碍的重排是产生生物多样性的重要机制。
通讯作者
**孙永帅**
个人简介:
2004-2008年,兰州大学,学士;
2008-2012年,兰州大学,博士;
2013–2015年,四川大学,博后 。
研究方向:
植物的物种形成、生物多样性对气候变化的生态响应和进化适应。
doi: 10.1038/s41467-020-17111-w
Journal: Nature Communications
Published date: July 06, 2020
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