首页|Cryptic divergences and repeated hybridizations within the endangered"living fossil"dove tree(Davidia involucrata)revealed by whole genome resequencing
Cryptic divergences and repeated hybridizations within the endangered"living fossil"dove tree(Davidia involucrata)revealed by whole genome resequencing
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The identification and understanding of cryptic intraspecific evolutionary units(lineages)are crucial for planning effective conservation strategies aimed at preserving genetic diversity in endangered species.However,the factors driving the evolution and maintenance of these intraspecific lineages in most en-dangered species remain poorly understood.In this study,we conducted resequencing of 77 individuals from 22 natural populations of Davidia involucrata,a"living fossil"dove tree endemic to central and southwest China.Our analysis revealed the presence of three distinct local lineages within this endan-gered species,which emerged approximately 3.09 and 0.32 million years ago.These divergence events align well with the geographic and climatic oscillations that occurred across the distributional range.Additionally,we observed frequent hybridization events between the three lineages,resulting in the formation of hybrid populations in their adjacent as well as disjunct regions.These hybridizations likely arose from climate-driven population expansion and/or long-distance gene flow.Furthermore,we identified numerous environment-correlated gene variants across the total and many other genes that exhibited signals of positive evolution during the maintenance of two major local lineages.Our findings shed light on the highly dynamic evolution underlying the remarkably similar phenotype of this en-dangered species.Importantly,these results not only provide guidance for the development of conser-vation plans but also enhance our understanding of evolutionary past for this and other endangered species with similar histories.
Yumeng Ren、Lushui Zhang、Xuchen Yang、Hao Lin、Yupeng Sang、Landi Feng、Jianquan Liu、Minghui Kang
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Key Laboratory of Bio-resource and Eco-environment of Ministry of Education,College of Life Sciences,Sichuan University,Chengdu 610065,China
Guangdong Provincial Key Laboratory of Plant Adaptation and Molecular Design,Guangzhou Key Laboratory of Crop Gene Editing,Innovative Center of Molecular Genetics and Evolution,School of Life Sciences,Guangzhou University,Guangzhou 510006,China
State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystem,College of Ecology,Lanzhou University,Lanzhou 730000,China
Second Tibetan Plateau Scientific Expedition and Research Program(STEP)中国科学院战略规划重点项目中央高校基本科研业务费专项International Collaboration 111 Program
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