Simultaneous evaluation of the effects of geographic, environmental and temporal isolation in ecotypic populations of Solidago virgaurea.
Simultaneous evaluation of the effects of geographic, environmental and temporal isolation in ecotypic populations of Solidago virgaurea.
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DOI：
10.1111/nph.14744
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发表时间：
2017-08
期刊：
影响因子：
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通讯作者：
S. Sakaguchi;K. Horie;N. Ishikawa;A. Nagano;Masaki Yasugi;H. Kudoh;M. Ito
中科院分区：
文献类型：
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作者：
S. Sakaguchi;K. Horie;N. Ishikawa;A. Nagano;Masaki Yasugi;H. Kudoh;M. Ito
生态物种形成的早期阶段可以创造出不同于相关种群的生态和繁殖时机的种群。景观遗传模型结合了环境异质性和种群特有的生殖特征，能够推断种群遗传分化的过程。我们研究了一枝黄花生态型种群的全基因组遗传变异。一枝黄花是一种草本植物，生活在广泛的生境(林地、蛇形荒地和高山草原)，并且在开花时间上表现出显著的变异。对环境因子的同时评价表明，土壤类型差异对中性遗传分化的影响大于海拔差异。这一结果可能反映了地质边界造成的突然环境变化，而山坡则表现出倾斜的变化，促进了相邻种群之间的基因交换。时间隔离与遗传分化呈正相关，一些早花蛇纹居群的等位基因频率与邻近的非蛇纹居群不同。总体而言，这项研究强调了生态过程和开花时间进化在复杂景观中促进黄花蛇舌草种群遗传分化的重要性。
Early stages of ecological speciation can create populations with an ecology and reproduction timing distinct from those of related populations. Landscape genetic models incorporating environmental heterogeneity and population-specific reproductive traits enable the processes of population genetic differentiation to be inferred. We investigated genome-wide genetic variation in ecotypic populations of Solidago virgaurea sensu lato, a herbaceous plant inhabiting a wide range of habitats (woodlands, serpentine barrens and alpine grasslands) and displaying remarkable variation in flowering time. Simultaneous evaluation of environmental factors revealed an overwhelming effect of soil type differences on neutral genetic differentiation, compared with elevational differences. This result probably reflects the abrupt environmental changes generated by geological boundaries, whereas mountain slopes exhibit clinal changes, facilitating gene exchange between neighbouring populations. Temporal isolation was positively associated with genetic differentiation, with some early-flowering serpentine populations having allele frequencies distinct from adjacent nonserpentine populations. Overall, this study highlights the importance of ecological processes and of evolution of flowering time to promote genetic differentiation of S. virgaurea populations in a complex landscape.