A multi-genome analysis approach enables tracking of the invasion of a single Russian wheat aphid (Diuraphis noxia) clone throughout the New World

This study investigated the population genetics, demographic history and pathway of invasion of the Russian wheat aphid (RWA) from its native range in Central Asia, the Middle East and Europe to South Africa and the Americas. We screened microsatellite markers, mitochondrial DNA, and endosymbiont genes in 504 RWA clones from nineteen populations worldwide. Following pathway analyses of microsatellite and endosymbiont data, we postulate that Turkey and Syria were the most likely sources of invasion to Kenya and South Africa, respectively. Furthermore, we found that one clone transferred between South Africa and the Americas was most likely responsible for the New World invasion. Finally, endosymbiont DNA was found to be a high resolution population genetic marker, extremely useful for studies of invasion over a relatively short evolutionary history timeframe. This study has provided valuable insights into the factors that may have facilitated the recent global invasion by this damaging p...

本研究针对俄罗斯麦蚜（Russian wheat aphid, RWA）的群体遗传学、种群历史及入侵路径展开探究，该虫原生分布范围涵盖中亚、中东与欧洲，本次研究聚焦其向南非及美洲的入侵过程。我们对全球19个种群的504个俄罗斯麦蚜克隆株开展了微卫星标记（microsatellite markers）、线粒体DNA（mitochondrial DNA）及共生菌基因（endosymbiont genes）的筛选检测。经对微卫星与共生菌数据进行路径分析后，我们推测土耳其与叙利亚分别为肯尼亚和南非入侵事件的最可能来源种群。此外，我们发现一株在南非与美洲间转移的克隆株，极有可能是促成新大陆入侵的元凶。最后，本研究证实共生菌DNA可作为一种高分辨率群体遗传标记，在相对较短进化时间尺度下的入侵生物学研究中极具应用价值。本研究为揭示这种具有破坏性的[原文内容截断]近期全球入侵的潜在驱动因素提供了宝贵见解。