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Genetic diversity in introduced Douglas-fir and its natural regeneration in Central Europe
Forestry ( IF 2.8 ) Pub Date : 2019-10-11 , DOI: 10.1093/forestry/cpz055
Charalambos Neophytou 1 , Marcela van Loo 2 , Hubert Hasenauer 1
Affiliation  

Since its first introduction in the 19th century, Douglas-fir has become the economically most important non-native forest tree species in Central European countries. Many of these planted forests are important seed sources and/or exhibit natural regeneration. Thus, it is important to assess (1) the genetic diversity of the mature stands and (2) if the genetic diversity can be passed on to the next generations. In order to address these issues, we genotyped mature Douglas-fir individuals and natural regeneration from >100 native and non-native populations using nuclear microsatellite markers. We compared the genetic diversity of native North American populations with mature Douglas-fir populations in Central Europe. The results show that genetic diversity did not differ significantly between European populations and the assigned native origin. Using a subset of 36 sites from Central Europe, we detected a significant reduction in the genetic diversity of adult versus naturally regenerated juvenile trees, indicating a bottleneck effect in the next generation of European Douglas-fir stands. The main reason may be that the mature European Douglas-fir stands are highly fragmented and thus the stand size is not adequate for transmitting the genetic diversity to the next generation. This should be taken into account for the commercial harvesting of seed stands. Seed orchards may offer a potential alternative in providing high quality and genetically diverse reproductive material.

中文翻译:

引入的道格拉斯冷杉的遗传多样性及其在中欧的自然更新

自19世纪首次引入以来,花旗松已成为中欧国家/地区经济上最重要的非本地树种。这些人工林中许多是重要的种子来源和/或表现出自然再生。因此,重要的是评估(1)成熟林分的遗传多样性,以及(2)是否可以将遗传多样性传给下一代。为了解决这些问题,我们使用核微卫星标记对成熟的花旗松个体进行基因分型,并从100多个本地和非本地人口中自然再生。我们将北美原住民种群与中欧成熟的道格拉斯冷杉种群的遗传多样性进行了比较。结果表明,欧洲人群和指定的土著人之间的遗传多样性没有显着差异。使用来自中欧的36个站点的子集,我们检测到成年树和自然再生的幼树的遗传多样性显着降低,这表明下一代欧洲花旗松林分会产生瓶颈效应。主要原因可能是欧洲成熟的道格拉斯冷杉林分片高度分散,因此林分大小不足以将遗传多样性传递给下一代。在种苗的商业化收获中应考虑到这一点。种子园可以提供高质量和遗传多样的繁殖材料。表明下一代欧洲花旗松林分会产生瓶颈效应。主要原因可能是欧洲成熟的道格拉斯冷杉林分片高度分散,因此林分大小不足以将遗传多样性传递给下一代。在种苗的商业化收获中应考虑到这一点。种子园可以提供高质量和遗传多样的繁殖材料。表明下一代欧洲花旗松林分会产生瓶颈效应。主要原因可能是欧洲成熟的道格拉斯冷杉林分片高度分散,因此林分大小不足以将遗传多样性传递给下一代。在种苗的商业化收获中应考虑到这一点。种子园可以提供高质量和遗传多样的繁殖材料。
更新日期:2019-10-11
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