生物
生态型
局部适应
基因流
进化生物学
连锁不平衡
人口
溯祖理论
群体遗传学
遗传学
遗传变异
等位基因
基因
系统发育学
单倍型
人口学
社会学
作者
Kaichi Huang,Rose L. Andrew,Gregory L. Owens,Kate L. Ostevik,Loren H. Rieseberg
摘要
Abstract Both models and case studies suggest that chromosomal inversions can facilitate adaptation and speciation in the presence of gene flow by suppressing recombination between locally adapted alleles. Until recently, however, it has been laborious and time‐consuming to identify and genotype inversions in natural populations. Here we apply RAD sequencing data and newly developed population genomic approaches to identify putative inversions that differentiate a sand dune ecotype of the prairie sunflower ( Helianthus petiolaris ) from populations found on the adjacent sand sheet. We detected seven large genomic regions that exhibit a different population structure than the rest of the genome and that vary in frequency between dune and nondune populations. These regions also show high linkage disequilibrium and high heterozygosity between, but not within, arrangements, consistent with the behaviour of large inversions, an inference subsequently validated in part by comparative genetic mapping. Genome–environment association analyses show that key environmental variables, including vegetation cover and soil nitrogen, are significantly associated with inversions. The inversions colocate with previously described “islands of differentiation,” and appear to play an important role in adaptive divergence and incipient speciation within H. petiolaris .
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