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首页> 美国卫生研究院文献>Ecology and Evolution >As old as the hills: Pliocene palaeogeographical processes influence patterns of genetic structure in the widespread common shrub
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As old as the hills: Pliocene palaeogeographical processes influence patterns of genetic structure in the widespread common shrub

机译：像山一样古老：专利族古地球场进程影响遗传结构的遗传结构模式普通灌木

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摘要

The impact of Quaternary glaciation on the development of phylogeographic structure in plant species is well documented. In unglaciated landscapes, phylogeographic patterns tend to reflect processes relating to persistence and stochasticity, yet other factors, associated with the palaeogeographical history of the landscape, including geomorphological events, can also have a significant influence. The unglaciated landscape of south‐western Western Australia is an ideal location to observe these ancient drivers of lineage diversification, with tectonic activity associated with the Darling Fault in the late Pliocene attributed to patterns of deep phylogeographic divergence in a widespread tree from this region. Interestingly, other species within this region have not shown this pattern and this palaeogeographical boundary therefore presents an opportunity to examine age and historical distribution of plant species endemic to this region. In this study, we assess patterns of genetic diversity and structure across 28 populations of the widespread shrub Banksia sessilis using three cpDNA markers and nine nuclear microsatellite markers. Sixteen cpDNA haplotypes were identified, comprising two major chloroplast DNA lineages that are estimated to have diverged in the Pliocene, approximately 3.3 million years ago. This timing coincides with major geomorphological processes in the landscape, including the separation of the Darling Plateau from the adjacent Swan Coastal Plain, as well as eustatic changes on the Swan Coastal Plain that are likely to have resulted in the physical isolation of historical plant lineages. Chloroplast lineages were broadly aligned with populations associated with older lateritic soils of the Darling Plateau and Geraldton sandplains or the younger sandy soils associated with the Swan Coastal Plain and Southern Coastline. This structural pattern of lateritic versus non‐lateritic division was not observed in the nuclear microsatellite data that identified three genetic clades that roughly corresponded to populations in the North, South, and Central portions of the distributions.
机译：第四纪冰川对植物物种植物物种发展的影响得到了很好的记录。在不符号的景观中，Phylogeache模式倾向于反映与持久性和随机性的过程，而其他因素，其他因素，与包括地貌事件在内的景观的古地图历史相关，也可以产生重大影响。澳大利亚西南西南部的未呈现景观是观察这些古代驾驶员的理想位置，具有与在该地区的广泛树上的深线地理分歧中的Darling Teact中的构造活动相关。有趣的是，该地区内的其他物种没有显示出这种模式，因此这种古地理边界因此提供了一个探讨该地区特有人物的年龄和历史分布的机会。在这项研究中，我们使用三个CPDNA标记和九个核微卫星标记评估了28个群体的遗传多样性和结构模式。鉴定了16个CPDNA单倍型，包括两个主要叶绿体DNA谱系，估计在大约330万年前在庞大卓岛中分散。这种定时与景观中的主要地貌过程一致，包括宠儿高原与相邻的天鹅沿海平原的分离，以及天鹅沿海平原的常见变化，这可能导致历史植物谱系的物理隔离。叶绿体谱系与与达林高原和杰拉尔顿凉板的较旧的斑岩土壤相关的群体与与天鹅沿海平原和南部海岸线相关联的较大的砂土。在核微卫星数据中未观察到这种外形与非外氏划分的结构模式，该数据鉴定了三种遗传分类，该数据大致与北，南方和中央部分的群体大致相对应。

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