Maintenance of Species Differences in Closely Related Tetraploid Parasitic Euphrasia (Orobanchaceae) on an Isolated Island.
Maintenance of Species Differences in Closely Related Tetraploid Parasitic Euphrasia (Orobanchaceae) on an Isolated Island.
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在一个孤立的岛屿上维持密切相关的四倍体寄生虫（Orobanchaceae）的物种差异。
DOI：
10.1016/j.xplc.2020.100105
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发表时间：
2020-11-09
影响因子：
10.5
通讯作者：
Twyford AD
中科院分区：
文献类型：
--
作者：
Becher H;Brown MR;Powell G;Metherell C;Riddiford NJ;Twyford AD
多倍性在被子植物进化中普遍存在，在适应和物种形成中起着重要作用。然而，由于复杂的序列同源性，具有挑战性的基因组组装和分类学的复杂性，多倍体群体研究不足。在这里，我们研究适应性分歧在分类学上复杂的eyebrights（Euphrasia），最近的分歧，表型可塑性和杂交模糊种的界限。我们专注于三个密切相关的四倍体物种与对比的生态偏好，是同域的公平岛，在不列颠群岛的一个小孤岛。使用一个共同的花园实验，我们表现出遗传成分的形态差异，这些物种之间存在。使用全基因组测序和一种新的k-mer方法，我们称之为“Tetmer”，我们证明，该物种是异源多倍体的起源，与亚基因组分歧约5%。使用1200万个SNP，我们显示了跨物种的亚基因组同源性，最近物种形成的序列差异非常低。这种遗传变异是广泛的物种结构，与公平岛石南地的Euphrasia micrantha明显分歧，而草原Euphrasia arctica和沿海Euphrasia foulaensis更密切相关。总的来说，我们表明，四倍体Euphrasia是一个系统的异源多倍体的冰后期物种的分歧，在适应新的环境可能会赋予旧的变种重新排列成新的遗传谱系。本研究的重点是适应性分歧在分类学上复杂的eyebrights（Euphrasia），最近的起源，表型可塑性和杂交模糊种的界限。使用大型公共花园实验，群体基因组学和新型k-mer应用程序（Tetmer），这项研究揭示了（1）支持表型差异的遗传成分，（2）物种之间遗传分歧的复杂模式，以及（3）该组共享异源多倍体构成。
Polyploidy is pervasive in angiosperm evolution and plays important roles in adaptation and speciation. However, polyploid groups are understudied due to complex sequence homology, challenging genome assembly, and taxonomic complexity. Here, we study adaptive divergence in taxonomically complex eyebrights (Euphrasia), where recent divergence, phenotypic plasticity, and hybridization blur species boundaries. We focus on three closely related tetraploid species with contrasting ecological preferences that are sympatric on Fair Isle, a small isolated island in the British Isles. Using a common garden experiment, we show a genetic component to the morphological differences present between these species. Using whole-genome sequencing and a novel k-mer approach we call “Tetmer”, we demonstrate that the species are of allopolyploid origin, with a sub-genome divergence of approximately 5%. Using ∼2 million SNPs, we show sub-genome homology across species, with a very low sequence divergence characteristic of recent speciation. This genetic variation is broadly structured by species, with clear divergence of Fair Isle heathland Euphrasia micrantha, while grassland Euphrasia arctica and coastal Euphrasia foulaensis are more closely related. Overall, we show that tetraploid Euphrasia is a system of allopolyploids of postglacial species divergence, where adaptation to novel environments may be conferred by old variants rearranged into new genetic lineages. This study focuses on adaptive divergence in taxonomically complex eyebrights (Euphrasia), where recent origins, phenotypic plasticity, and hybridization blur species boundaries. Using a large common garden experiment, population genomics, and a novel k-mer app (Tetmer), this study reveals (1) a genetic component underpinning phenotypic differences, (2) complex patterns of genetic divergence between species, and (3) that the group shares an allopolyploid constitution.
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影响因子：
64.8
作者：
Dasmahapatra, Kanchon K.;Walters, James R.;Briscoe, Adriana D.;Davey, John W.;Whibley, Annabel;Nadeau, Nicola J.;Zimin, Aleksey V.;Hughes, Daniel S. T.;Ferguson, Laura C.;Martin, Simon H.;Salazar, Camilo;Lewis, James J.;Adler, Sebastian;Ahn, Seung-Joon;Baker, Dean A.;Baxter, Simon W.;Chamberlain, Nicola L.;Chauhan, Ritika;Counterman, Brian A.;Dalmay, Tamas;Gilbert, Lawrence E.;Gordon, Karl;Heckel, David G.;Hines, Heather M.;Hoff, Katharina J.;Holland, Peter W. H.;Jacquin-Joly, Emmanuelle;Jiggins, Francis M.;Jones, Robert T.;Kapan, Durrell D.;Kersey, Paul;Lamas, Gerardo;Lawson, Daniel;Mapleson, Daniel;Maroja, Luana S.;Martin, Arnaud;Moxon, Simon;Palmer, William J.;Papa, Riccardo;Papanicolaou, Alexie;Pauchet, Yannick;Ray, David A.;Rosser, Neil;Salzberg, Steven L.;Supple, Megan A.;Surridge, Alison;Tenger-Trolander, Ayse;Vogel, Heiko;Wilkinson, Paul A.;Wilson, Derek;Yorke, James A.;Yuan, Furong;Balmuth, Alexi L.;Eland, Cathlene;Gharbi, Karim;Thomson, Marian;Gibbs, Richard A.;Han, Yi;Jayaseelan, Joy C.;Kovar, Christie;Mathew, Tittu;Muzny, Donna M.;Ongeri, Fiona;Pu, Ling-Ling;Qu, Jiaxin;Thornton, Rebecca L.;Worley, Kim C.;Wu, Yuan-Qing;Linares, Mauricio;Blaxter, Mark L.;Ffrench-Constant, Richard H.;Joron, Mathieu;Kronforst, Marcus R.;Mullen, Sean P.;Reed, Robert D.;Scherer, Steven E.;Richards, Stephen;Mallet, James;McMillan, W. Owen;Jiggins, Chris D.
通讯作者：
Jiggins, Chris D.
DOI：
10.1073/pnas.95.16.9402
发表时间：
1998-08-04
影响因子：
11.1
作者：
Baldwin, BG;Sanderson, MJ
通讯作者：
Sanderson, MJ
影响因子：
6.5
作者：
Brandrud, Marie K.;Baar, Juliane;Paun, Ovidiu
通讯作者：
Paun, Ovidiu
影响因子：
3.3
作者：
Cui, Rongfeng;Schumer, Molly;Rosenthal, Gil G.
通讯作者：
Rosenthal, Gil G.
影响因子：
1.7
作者：
Bankevich, Anton;Nurk, Sergey;Pevzner, Pavel A.
通讯作者：
Pevzner, Pavel A.