Genome-wide analysis of Cushion willow provides insights into alpine plant divergence in a biodiversity hotspot
Genome-wide analysis of Cushion willow provides insights into alpine plant divergence in a biodiversity hotspot
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对垫柳的全基因组分析提供了对生物多样性热点地区高山植物分化的见解
DOI：
10.1038/s41467-019-13128-y
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发表时间：
2019-10-19
影响因子：
16.6
通讯作者：
Sun, Hang
中科院分区：
文献类型：
--
作者：
Chen, Jia-hui;Huang, Yuan;Sun, Hang
横断山区(HDM)生物多样性热点地区具有特殊的高山植物多样性。在这里，我们研究了驱动HDM高山物种肩柳(垫柳)种内分歧的因素，这是近生植物组合的常见组成部分。我们为这个物种制作了一个高质量的基因组集合，并通过对从其分布中收集的个体进行重新测序来表征其遗传多样性、种群结构和进化模式。我们发现了种群分化，这种分化是由孤立的天空岛状栖息地景观所塑造的，这种景观显示出跨海拔梯度的强烈环境异质性，以及大约从中新世晚期以来发生的种群规模波动。这些因素可能是缓冲柳树和其他类似分布的高山植物种内差异的重要驱动因素。由于种内差异往往是物种形成的第一步，同样的因素也可能是导致HDM中高山物种多样性的重要因素。
The Hengduan Mountains (HDM) biodiversity hotspot exhibits exceptional alpine plant diversity. Here, we investigate factors driving intraspecific divergence within a HDM alpine species Salix brachista (Cushion willow), a common component of subnival assemblages. We produce a high-quality genome assembly for this species and characterize its genetic diversity, population structure and pattern of evolution by resequencing individuals collected across its distribution. We detect population divergence that has been shaped by a landscape of isolated sky island-like habitats displaying strong environmental heterogeneity across elevational gradients, combined with population size fluctuations that have occurred since approximately the late Miocene. These factors are likely important drivers of intraspecific divergence within Cushion willow and possibly other alpine plants with a similar distribution. Since intraspecific divergence is often the first step toward speciation, the same factors can be important contributors to the high alpine species diversity in the HDM.