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首页> 外文期刊>Ecology and Evolution >Phylogeographic study of Chinese seabuckthorn (Hippophae rhamnoides subsp.sinensis Rousi) reveals two distinct haplotype groups and multiple microrefugia on the Qinghai‐Tibet Plateau
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Phylogeographic study of Chinese seabuckthorn (Hippophae rhamnoides subsp.sinensis Rousi) reveals two distinct haplotype groups and multiple microrefugia on the Qinghai‐Tibet Plateau

机译：中国沙棘（沙棘中华亚种）的系统地理学研究揭示了青藏高原上两个不同的单倍型群和多个微区系

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AbstractHistorical climate change can shape the genetic pattern of a species. Studies on this phenomenon provide great advantage in predicting the response of species to current and future global climate change. Chinese seabuckthorn (Hippophae rhamnoides subsp. sinensis) is one of the most important cultivated plants in Northwest China. However, the subspecies history and the potential genetic resources within the subspecies range remain unclear. In this study, we utilized two intergenic chloroplast regions to characterize the spatial genetic distribution of the species. We found 19 haplotypes in total, 12 of which were unique to the Chinese seabuckthorn. The populations observed on the Qinghai-Tibet Plateau (QTP) consisted of most of the haplotypes, while in the northeast of the range of the subspecies, an area not on the QTP, only four haplotypes were detected. Our study also revealed two distinct haplotype groups of the subspecies with a sharp transition region located in the south of the Zoige Basin. 89.96% of the genetic variation located between the regions. Mismatch analysis indicated old expansions of these two haplotype groups, approximately around the early stage of Pleistocene. Additional morphological proofs from existing studies and habitat differentiation supported a long independent colonization history among the two regions. Potential adaptation probably occurred but needs more genome and morphology data in future. Chinese seabuckthorn have an older population expansion compared with subspecies in Europe. The lack of large land ice sheets and the heterogeneous landscape of the QTP could have provided extensive microrefugia for Chinese seabuckthorn during the glaciation period. Multiple localities sustaining high-frequency private haplotypes support this hypothesis. Our study gives clear insight into the distribution of genetic resources and the evolutionary history of Chinese seabuckthorn.
机译：摘要历史的气候变化可以影响物种的遗传模式。对这一现象的研究在预测物种对当前和未来全球气候变化的响应方面具有巨大优势。中国沙棘（沙棘）是中国西北地区最重要的栽培植物之一。但是，亚种的历史和亚种范围内的潜在遗传资源仍不清楚。在这项研究中，我们利用两个基因间叶绿体区域来表征该物种的空间遗传分布。我们发现共有19种单倍型，其中12种是中国沙棘所独有的。在青藏高原（QTP）上观察到的种群由大多数单倍型组成，而在亚种范围的东北部，不在QTP上的区域，仅检测到四种单倍型。我们的研究还揭示了亚种的两个不同的单倍型群，它们在Zoige盆地的南部具有一个明显的过渡区域。 89.96％的遗传变异位于区域之间。错配分析表明这两个单倍型群的旧扩展，大约在更新世早期。现有研究和栖息地分化的其他形态学证据支持了两个地区之间长期的独立定殖历史。可能发生了潜在的适应，但将来需要更多的基因组和形态学数据。与欧洲的亚种相比，中国沙棘的人口扩张年龄更大。冰川期缺乏陆地冰盖和QTP的异质景观可能为中国沙棘提供了广泛的微环境。维持高频私人单倍型的多个地区支持这一假设。我们的研究清楚地了解了中国沙棘的遗传资源分布和进化史。

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