Efficient Long-Distance Gene Flow into an Isolated Relict Oak Stand
Efficient Long-Distance Gene Flow into an Isolated Relict Oak Stand
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DOI：
10.1093/jhered/esr023
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发表时间：
2011-07-01
影响因子：
3.1
通讯作者：
Degen, Bernd
中科院分区：
文献类型：
--
作者：
Buschbom, Jutta;Yanbaev, Yulay;Degen, Bernd
地理隔离和小种群以外的一个物种的中心分布范围可能是非常重要的一个物种的能力，迅速调整其分布范围的全球变化动态。来自外部的基因流在这些边缘种群的命运中起着关键作用。有人提出，空间碎片化和感知的地理隔离并不一定反映了树种遗传连接性的丧失。然而，远距离基因流动的空间限制及其规模和影响仍然普遍未知。在本研究中，我们分析了长距离花粉介导的基因流到一个孤立的孑遗林7个个体的粗壮栎。基于177株树木和9个微卫星位点的总样本。我们表明，花粉介导的基因流超过80公里，在这个风授粉树种贡献了至少35%的所有成功授粉的调查隔离和小橡树站在东部限制的物种的分布。观察到的花粉迁移形成了橡子后代的遗传多样性的立场，并可能解释了持续成人群体中的高遗传多样性。
Geographically isolated and small populations outside a species' central distribution range are likely to be of major importance to a species' ability to quickly adjust its distribution range to global change dynamics. Gene flow from the outside plays a pivotal role in the fate of these marginal populations. It has been proposed that spatial fragmentation and perceived geographic isolation do not necessarily reflect a loss of genetic connectivity in tree species. However, the spatial limits of long-distance gene flow, as well as its magnitude and impact, are still generally unknown. In the present study, we analyzed long-distance pollen-mediated gene flow into an isolated relict stand consisting of 7 individuals of Quercus robur L. based on a total sample of 177 trees and 9 microsatellite loci. We show that pollen-mediated gene flow across more than 80 km in this wind-pollinated tree species contributed at least 35% of all successful pollinations in the investigated isolated and small oak stand at the eastern limit of the species' distribution. The observed pollen immigration shaped the genetic diversity of acorn progenies in the stand and might explain the comparably high genetic diversity in the persisting adult population.