Phylogeographic analysis of the East Asian goldenrod (Solidago virgaurea complex, Asteraceae) reveals hidden ecological diversification with recurrent formation of ecotypes
Phylogeographic analysis of the East Asian goldenrod (Solidago virgaurea complex, Asteraceae) reveals hidden ecological diversification with recurrent formation of ecotypes
复制标题
东亚黄花（一枝黄花，菊科）的系统发育地理学分析揭示了隐藏的生态多样性和生态型的反复形成
DOI：
10.1093/aob/mcx182
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发表时间：
2017
期刊：
影响因子：
4.2
通讯作者：
Ito Motomi
中科院分区：
文献类型：
--
作者：
Sakaguchi Shota;Kimura Takuma;Kyan Ryuta;Maki Masayuki;Nishino Takako;Ishikawa Naoko;Nagano Atsushi J;Honjo Mie N;Yasugi Masaki;Kudoh Hiroshi;Li Pan;Choi Hyeok Jae;Chernyagina Olga A;Ito Motomi
背景和目的谱系多样化的过程和机制是进化生物学研究的重要课题。在日本列岛，黄毛一枝黄花（Solidagavirgaureacomplex）的欧亚种表现出显著的形态和生态多样性，其生态类群适应于特定的环境（气候、土壤条件和干扰机制）。物种复合体是一个合适的模型来调查的进化过程中积极形成植物类群，由于它的能力，进化关系到环境适应和其历史population dynamics.Methods2叶绿体标记，18核微卫星标记和ddRAD测序被用来推断群体遗传人口学的S。virgaureacomplex与其相关的种/generation.Key ResultsOur分析表明，在日本的人口形成一个进化单位，这是从邻近的大陆人口的遗传分化。群岛内部的系统发育结构与地理位置有很强的对应关系，但有趣的是，遗传结构与生态类型界限之间并不一致;不同生态型的相邻种群共享遗传background.ConclusionsWe建议，特定于生态型实体的性状是通过自然选择保持的，或者是最近产生的，对基因组几乎没有影响，使全基因组遗传标记不适合检测生态型分化。此外，一些零星分布的分类群（发现作为rheophytes和高山植物）重复产生的一个更广泛的分类群在地理上遥远的地区通过选择。总的来说，这项研究表明，一枝黄花复合体具有很高的进化能力，在最近的时间范围内实现了快速的生态多样化。
Background and AimsThe processes and mechanisms underlying lineage diversification are major topics in evolutionary biology. Eurasian goldenrod species of theSolidago virgaureacomplex show remarkable morphological and ecological diversity in the Japanese Archipelago, with ecotypic taxa well adapted to specific environments (climate, edaphic conditions and disturbance regimes). The species complex is a suitable model to investigate the evolutionary processes of actively speciating plant groups, due to its ability to evolve in relation to environmental adaptation and its historical population dynamics.MethodsTwo chloroplast markers, 18 nuclear microsatellite markers and ddRAD-sequencing were used to infer population genetic demography ofS. virgaureacomplex with its related species/genera.Key ResultsOur analysis showed that populations in Japan form an evolutionary unit, which was genetically diverged from adjacent continental populations. The phylogenetic structure within the archipelago strongly corresponds to the geography, but interestingly there is no concordance between genetic structure and ecotypic boundaries; neighbouring populations of distinct ecotypes share a genetic background.ConclusionsWe propose that the traits specific to the ecotypic entities are maintained by natural selection or are very recently generated and have little effect on the genomes, making genome-wide genetic markers unsuitable for detecting ecotypic differentiation. Furthermore, some sporadically distributed taxa (found as rheophytes and alpine plants) were repeatedly generated from a more widespread taxon in geographically distant areas by means of selection. Overall, this study showed that the goldenrod complex has a high ability to evolve, enabling rapid ecological diversification over a recent timeframe.