Extensive contemporary pollen-mediated gene flow in two herb species, Ranunculus bulbosus and Trifolium montanum, along an altitudinal gradient in a meadow landscape
Extensive contemporary pollen-mediated gene flow in two herb species, Ranunculus bulbosus and Trifolium montanum, along an altitudinal gradient in a meadow landscape
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DOI：
10.1093/aob/mct021
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发表时间：
2013-04-01
期刊：
影响因子：
4.2
通讯作者：
Pluess, Andrea R.
中科院分区：
文献类型：
--
作者：
Matter, Philippe;Kettle, Chris J.;Pluess, Andrea R.
在沿着海拔12001800 m的梯度上，研究了两种常见草本植物毛茛（Ranunculus bulbosus）和三叶草（Trifolium montanum）的历史基因流、开花物候和当代花粉流模式。在瑞士5个高山草甸中，F-st值分别为001和0007，表明历史基因流是广泛的。bulbosus和T. montanum，分别通过类似的等位基因丰富度之间的草甸和分组的所有个人到一个遗传簇。我们的数据表明，当代花粉流动并不局限于这两个物种的海拔高度，但在T。montanum，如所示的差异衰减的亲缘关系相关的空间距离增加。草甸间的开花物候不是T. montanum，因为草甸对之间的大重叠与广泛的花粉流一致。R.球根草甸可能解释了花粉流动的有限性。bulbosus和T. montanum应促进基因交流，从而加强对迅速气候变化的适应性反应。
Genetic connectivity between plant populations allows for exchange and dispersal of adaptive genes, which can facilitate plant population persistence particularly in rapidly changing environments.Patterns of historic gene flow, flowering phenology and contemporary pollen flow were investigated in two common herbs, Ranunculus bulbosus and Trifolium montanum, along an altitudinal gradient of 12001800 m a.s.l. over a distance of 1 km among five alpine meadows in Switzerland.Historic gene flow was extensive, as revealed by F-st values of 001 and 0007 in R. bulbosus and T. montanum, respectively, by similar levels of allelic richness among meadows and by the grouping of all individuals into one genetic cluster. Our data suggest contemporary pollen flow is not limited across altitudes in either species but is more pronounced in T. montanum, as indicated by the differential decay of among-sibships correlated paternity with increasing spatial distance. Flowering phenology among meadows was not a barrier to pollen flow in T. montanum, as the large overlap between meadow pairs was consistent with the extensive pollen flow. The smaller flowering overlap among R. bulbosus meadows might explain the slightly more limited pollen flow detected.High levels of pollen flow among altitudes in both R. bulbosus and T. montanum should facilitate exchange of genes which may enhance adaptive responses to rapid climate change.