Frequent long-distance gene flow in a rare temperate forest tree (Sorbus domestica) at the landscape scale
Frequent long-distance gene flow in a rare temperate forest tree (Sorbus domestica) at the landscape scale
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DOI：
10.1038/hdy.2009.70
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发表时间：
2009-12-01
期刊：
影响因子：
3.8
通讯作者：
Holderegger, R.
中科院分区：
文献类型：
--
作者：
Kamm, U.;Rotach, P.;Holderegger, R.
精确的经验数据，目前的基因流花粉，无论是在距离和丰度，是至关重要的，以了解栖息地片段是否在功能上连接。基于一个大规模的库存（约100公里（2）），其中所有个人的自然分散的森林树木（花楸）进行了映射，我们推断目前的基因流花粉使用遗传亲子关系分析。我们发现了一个广泛的有效的花粉传播网络。虽然短距离的花粉流是最丰富的，10%的指定的花粉供体是超过2公里，从他们的雌性交配伙伴，1.8%的距离甚至在12-16公里。后一种花粉流动表明，目前在破碎的景观上远距离的基因流动显然是存在的。花粉散布呈厚尾倒曲线。使用亲子关系分析建立的树木，母系遗传的叶绿体标记和直径在胸部高度测量作为一个指标，个别树的年龄，我们能够推断出定期种子传播距离超过几百米，超过10公里。我们的结论是，在温带，昆虫授粉和动物传播的树种，如S。南极洲，片段亚群功能连接的基因流通过花粉和种子。Heredity（2009）103，476-482; doi：10.1038/hdy.2009.70;在线发表2009年8月5日
Precise empirical data on current gene flow by pollen, both with respect to distance and abundance, is crucial to understand whether habitat fragments are functionally connected. Based on a large-scale inventory (approximate to 100 km(2)) in which all individuals of a naturally scattered forest tree (Sorbus domestica) were mapped, we inferred current gene flow by pollen using genetic paternity analysis. We detected an extensive network of effective pollen transfer. Although short pollen flow distances were most abundant, 10% of the assigned pollen donors were more than 2 km away from their female mating partners, and 1.8% were even at a distance of 12-16 km. This latter pollen flow shows that current long-distance gene flow over a fragmented landscape clearly occurs. Pollen dispersal was well described by a fat-tailed inverse curve. Using parentage analysis of established trees, maternally inherited chloroplast markers and diameter at breast height measurements as an indicator of individual tree age, we were able to infer regular seed dispersal distances over several hundred metres up to more than 10 km. We conclude that in temperate, insect-pollinated and animal-dispersed tree species such as S. domestica, fragmented subpopulations are functionally connected by gene flow through both pollen and seed. Heredity (2009) 103, 476-482; doi:10.1038/hdy.2009.70; published online 5 August 2009