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Post-Pleistocene radiation of the pea aphid complex revealed by rapidly evolving endosymbionts

机译:迅速进化的内共生体揭示豌豆蚜虫复合体的更新世辐射

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摘要

Adaptation to different resources has the potential to cause rapid species diversification, but few studies have been able to quantify the time scale of recent adaptive radiations. The pea aphid, Acyrthosiphon pisum, a model of speciation for host-specialized parasites, consists of several biotypes (races or species) living on distinct legume hosts. To document this radiation, we used rapidly evolving sequences from Buchnera, the maternally transmitted bacterial endosymbiont of aphids. Analyses of Buchnera pseudo-gene sequences revealed that 11 host-associated biotypes sort mostly into distinct matrilines despite low sequence divergence. A calibration based on divergence times of 7 sequenced genomes of Buchnera allowed us to date the last maternal ancestor of these biotypes between 8,000 and 16,000 years, with a burst of diversification at an estimated 3,600-9,500 years. The recency of this diversification, which is supported by microsatellite data, implies that the pea aphid complex ranks among the most rapid adaptive radiations yet documented. This diversification coincides with post-Pleistocene warming and with the domestication and anthropogenic range expansion of several of the legume hosts of pea aphids. Thus, we hypothesize that the new availability or abundance of resources triggered a cascade of divergence events in this newly formed complex.
机译:对不同资源的适应可能导致物种快速多样化,但是很少有研究能够量化最近适应性辐射的时间尺度。豌豆蚜虫(Acyrthosiphon pisum),一种寄主特化寄生虫的物种形成模型,由生活在不同豆科植物寄主上的几种生物型(种族或物种)组成。为了记录这种辐射,我们使用了来自母亲传播的蚜虫细菌内共生菌Buchnera的快速进化序列。 Buchnera假基因序列的分析表明,尽管序列差异较小,但11种与宿主相关的生物型仍主要分为不同的母系。根据布氏菌7个测序基因组的发散时间进行的校准,使我们可以将这些生物型的最后一个母系祖先定为8,000至16,000年之间的时间,并且据估计有3600至9500年的多样化。微卫星数据支持的这种多样化的新近性表明,豌豆蚜虫复合体位居迄今记录最迅速的适应性辐射之列。这种多样化与更新世后变暖以及豌豆蚜虫的几种豆科植物寄主的驯化和人为范围扩大同时发生。因此,我们假设新的资源可用性或资源丰富性在这个新形成的复合体中引发了一连串的发散事件。

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  • 作者单位

    Unite Mixte de Recherche 1099 Biologie des Organismes et des Populations appliquee a la Protection des Plantes, Institut National de la Recherche Agronomique, Domaine de la Motte BP 35327, 35653 Le Rheu cedex, France;

    Unite Mixte de Recherche 1099 Biologie des Organismes et des Populations appliquee a la Protection des Plantes, Institut National de la Recherche Agronomique, Domaine de la Motte BP 35327, 35653 Le Rheu cedex, France;

    Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85718;

    Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85718;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    adaptive radiation; buchnera; ecological speciation; host races; neolithic agriculture;

    机译:适应性辐射;布奇纳生态物种;主办比赛;新石器时代的农业;

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