Maintaining their genetic distance: Little evidence for introgression between widely hybridizing species of Geum with contrasting mating systems.
Maintaining their genetic distance: Little evidence for introgression between widely hybridizing species of Geum with contrasting mating systems.
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DOI：
10.1111/mec.14426
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发表时间：
2018-03
影响因子：
4.9
通讯作者：
Ennos RA
中科院分区：
文献类型：
--
作者：
Jordan CY;Lohse K;Turner F;Thomson M;Gharbi K;Ennos RA
在植物界中，许多属包含姐妹谱系，具有对比鲜明的异交和近交交配系统，已知可以杂交。这些姐妹谱系的进化命运很可能受到它们交换基因的程度的影响。我们测量了基因流之间的异交水杨梅和自交水杨梅，在当代人群中杂交的姐妹种。我们生成并使用G. urbanum的基因组草图来开发两个物种中可评分的dd‐RAD数据。来自异地种群的RAD数据的合并分析表明，该物种分歧2-3 Mya，并且它们之间的历史基因流非常低（每25代1个移民）。同域和异域物种之间的遗传分歧的比较，以及潜在的父母和杂种人口的等位基因频率的分析，提供了当代渐渗同域人口的证据。聚类和物种特异性标记分析显示，除了四个早期世代的杂种，同域种群中的个体分为两个遗传上不同的组，这与它们的形态学物种分类完全对应，最大个体混合估计值仅为1- 3%。然而，我们确实观察到了四个puronecrosis渗入SNP在G. urbanum种群中的两个支架上的联合分离，这与显著的形态变异相关，被解释为罕见的最近种间基因流动的初步证据。总的来说，我们的研究结果表明，尽管在当代人群中存在杂交种，G. rivere和G. urbanum之间的遗传交换在整个进化历史中是非常有限的。 https://doi.org/10.1111/mec.14444
Within the plant kingdom, many genera contain sister lineages with contrasting outcrossing and inbreeding mating systems that are known to hybridize. The evolutionary fate of these sister lineages is likely to be influenced by the extent to which they exchange genes. We measured gene flow between outcrossing Geum rivale and selfing Geum urbanum, sister species that hybridize in contemporary populations. We generated and used a draft genome of G. urbanum to develop dd‐RAD data scorable in both species. Coalescent analysis of RAD data from allopatric populations indicated that the species diverged 2–3 Mya, and that historical gene flow between them was extremely low (1 migrant every 25 generations). Comparison of genetic divergence between species in sympatry and allopatry, together with an analysis of allele frequencies in potential parental and hybrid populations, provided no evidence of contemporary introgression in sympatric populations. Cluster‐ and species‐specific marker analyses revealed that, apart from four early‐generation hybrids, individuals in sympatric populations fell into two genetically distinct groups that corresponded exactly to their morphological species classification with maximum individual admixture estimates of only 1–3%. However, we did observe joint segregation of four putatively introgressed SNPs across two scaffolds in the G. urbanum population that was associated with significant morphological variation, interpreted as tentative evidence for rare, recent interspecific gene flow. Overall, our results indicate that despite the presence of hybrids in contemporary populations, genetic exchange between G. rivale and G. urbanum has been extremely limited throughout their evolutionary history. https://doi.org/10.1111/mec.14444
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影响因子：
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