Land-use effects on genetic structure of a common grassland herb: A matter of scale
Land-use effects on genetic structure of a common grassland herb: A matter of scale
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DOI：
10.1016/j.baae.2011.06.001
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发表时间：
2011-01-01
影响因子：
3.8
通讯作者：
Durka, Walter
中科院分区：
文献类型：
--
作者：
Kloss, Lena;Fischer, Markus;Durka, Walter
欧洲草原最常见的管理措施是放牧牲畜和割草以获得青贮饲料和干草。放牧和割草对植物基因流和由此产生的种群遗传结构的潜在影响不同。在评估其繁殖系统后，我们调查了土地利用对常见的草地植物婆婆纳种群遗传结构的影响，在德国的三个地区，即所谓的生物多样性探索中心，使用63个研究种群的草地，割过的牧场和牧场。我们确定了植物密度和分析的遗传多样性，分化和小规模的遗传结构，利用扩增片段长度多态性（AFLP）标记。V chamaedrys的育种系统表现为自交不亲和和异交。其遗传多样性在不同土地利用类型之间没有差异。这可能是由于大的人口规模和强大的传播能力的物种，保持遗传多样性的人口不容易遗传漂变。种群间遗传分化较低（总体F-ST = 0.075），但三个地区之间的显着。只有一个地区的土地利用对种群分化的影响很弱。然而，土地利用影响小规模的遗传结构，表明地块内的基因流更受限制的草地上比割过和未割过的牧场。我们的研究表明，土地利用影响的遗传结构主要是在小规模的人口，尽管高基因流。
The most common management practices in European grasslands are grazing by livestock and mowing for silage and hay. Grazing and mowing differ in their potential effects on plant gene flow and resulting population genetic structure. After assessing its breeding system, we investigated the effect of land use on the population genetic structure in the common grassland plant Veronica chamaedrys using 63 study populations on meadows, mown pastures and pastures in three regions in Germany, the so-called Biodiversity Exploratories. We determined plant density and analysed the genetic diversity, differentiation and small-scale genetic structure using amplified fragment length polymorphism (AFLP) markers. The breeding system of V chamaedrys turned out as self-incompatible and outcrossing. Its genetic diversity did not differ among land-use types. This may be attributed to large population sizes and the strong dispersal ability of the species, which maintains genetically diverse populations not prone to genetic drift. Genetic differentiation among populations was low (overall F-ST = 0.075) but significant among the three regions. Land use had only weak effects on population differentiation in only one region. However, land use affected small-scale genetic structure suggesting that gene flow within plots was more restricted on meadows than on mown and unmown pastures. Our study shows that land use influences genetic structure mainly at the small scale within populations, despite high gene flow.