Gregor Mendel Institute, Austrian Academy of Sciences, Vienna Biocenter (VBC), Dr Bohr-Gasse 3, 1030 Vienna, Austria.
Institute of Ecology and Evolutionary Biology &Institute of Plant Biology, National Taiwan University, No. 1, Section 4, Roosevelt Rd, 10617 Taipei, Taiwan.
Nat Commun. 2017 Feb 9;8:14458. doi: 10.1038/ncomms14458.
Recent work has shown that Arabidopsis thaliana contains genetic groups originating from different ice age refugia, with one particular group comprising over 95% of the current worldwide population. In Europe, relicts of other groups can be found in local populations along the Mediterranean Sea. Here we provide evidence that these 'relicts' occupied post-glacial Eurasia first and were later replaced by the invading 'non-relicts', which expanded through the east-west axis of Eurasia, leaving traces of admixture in the north and south of the species range. The non-relict expansion was likely associated with human activity and led to a demographic replacement similar to what occurred in humans. Introgressed genomic regions from relicts are associated with flowering time and enriched for genes associated with environmental conditions, such as root cap development or metal ion trans-membrane transport, which suggest that admixture with locally adapted relicts helped the non-relicts colonize new habitats.
最近的研究表明，拟南芥含有源自不同冰河时代避难所的遗传群体，其中一个特定群体包含了当前全球范围内超过 95%的种群。在欧洲，地中海沿岸的当地种群中可以发现其他群体的残余。在这里，我们提供的证据表明，这些“残余”首先占据了后冰河时代的欧亚大陆，后来被入侵的“非残余”所取代，后者通过欧亚大陆的东西轴线扩张，在物种分布的南北留下了混合的痕迹。非残余的扩张可能与人类活动有关，并导致了类似于人类发生的人口替代。来自残余的渐渗基因组区域与开花时间有关，并且富集了与环境条件相关的基因，如根冠发育或金属离子跨膜运输，这表明与当地适应的残余混合有助于非残余适应新的栖息地。
