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第一作者:Marco Todesco
第一单位:加拿大不列颠哥伦比亚大学
通讯作者:Loren H. Rieseberg Abstract 背景回顾:Species often include multiple ecotypes that are adapted to different environments.
提出问题:However, it is unclear how ecotypes arise and how their distinctive combinations of adaptive alleles are maintained despite hybridization with non-adapted populations. 主要研究:Here, by resequencing 1,506 wild sunflowers from 3 species (Helianthus annuus, Helianthus petiolaris and Helianthus argophyllus), we identify 37 large (1–100 Mbp in size), non-recombining haplotype blocks that are associated with numerous ecologically relevant traits, as well as soil and climate characteristics. 单倍型区块:Limited recombination in these haplotype blocks keeps adaptive alleles together, and these regions differentiate sunflower ecotypes. 实例:For example, haplotype blocks control a 77-day difference in flowering between ecotypes of the silverleaf sunflower H. argophyllus (probably through deletion of a homologue of FLOWERING LOCUS T (FT)), and are associated with seed size, flowering time and soil fertility in dune-adapted sunflowers. 结构变异:These haplotypes are highly divergent, frequently associated with structural variants and often appear to represent introgressions from other—possibly now-extinct—congeners. 结论:These results highlight a pervasive role of structural variation in ecotypic adaptation.
摘 要
一个物种通常包含多个生态型,适应于不同的环境。然而,生态型如何形成以及其如何在与不具适应性群体杂交之后保持其特别的适应性等位基因组合,有关这些方面的研究一直存在较大的空白。本文中,通过对向日葵属3个物种1506株个体的重测序分析,作者鉴定到了37个长度在1-100Mbp间、非重组单倍型区块,这些区块与生态型相关性状位点高度相关,并且还与土壤以及气候特征相关。这些单倍型区块的重组限制使得适应性等位基因能够在一起,并且这些区域在不同的向日葵生态型群体间存在分化。比如,作者鉴定到的控制银叶向日葵开花晚77天的单倍型区块,其在沙丘适应性向日葵中与种子大小、开花时间以及土壤肥力相关。这些单倍型高度分化,并且经常与结构变异相关,可能来自于其它现今已灭绝的近缘物种的基因渗入。本文的研究突出了结构变异在生态适应中的广泛作用。
通讯作者
**Loren H. Rieseberg** 个人简介: 1987年,华盛顿州立大学,博士。 研究方向: 利用向日葵研究物种起源。
doi: 10.1038/s41586-020-2467-6
Journal: Nature
Published date: July 08, 2020
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