Natural regeneration of Fagus sylvatica L. adapts with maturation to warmer and drier microclimatic conditions
Natural regeneration of Fagus sylvatica L. adapts with maturation to warmer and drier microclimatic conditions
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DOI：
10.1016/j.foreco.2012.03.009
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发表时间：
2012-07-01
影响因子：
3.7
通讯作者：
Simon, Judy
中科院分区：
文献类型：
--
作者：
Bilela, Silvija;Dounavi, Aikaterini;Simon, Judy
由于其对干旱的敏感性，山毛榉作为中欧森林管理的一个受欢迎的树种，其业绩和竞争力很可能受到气候变化的不利影响，从而对受管理的森林生态系统的脆弱性产生重大影响。本文研究了来自东北相对寒冷潮湿地区的两个群体的遗传分化（代表中欧大部分山毛榉森林的当前气候）和相对温暖干燥的西南面斜坡（代表中欧山毛榉森林覆盖面积不断扩大的未来气候）在同一立地条件下，研究了两个种群在不同小气候条件下的适应过程。为此目的，两种不同的技术，即，核微卫星标记（中性）和同工酶标记（自适应），适用于成年树和天然更新在两个斜坡。虽然微卫星被认为是中性标记，但在几项研究中，它们已被证明可以发出选择性驱动变化的信号。在我们的研究中，五个微卫星中的两个表现为“离群位点”，表现出定向选择。研究结果表明，无论采用何种技术，西南坡天然更新与东北坡天然更新及成木的遗传关系都比西南坡的成木近。因此，我们得出结论，自然选择和潜在的适应帐户的遗传变化和不同的遗传结构之间的两个成年人口在这种情况下研究。(C)2012爱思唯尔有限公司版权所有。
Due to its drought sensitivity, the performance and competitiveness of beech as a favoured species of forest management in Central Europe is likely to be negatively affected by the prognosticated climate change, leading to major impacts on the vulnerability of managed forest ecosystems. We studied the genetic differentiation between two populations from a relatively cold and wet northeast (representing the current climate of the majority of beech forests in Central Europe) and a relatively warm and dry southwest facing slope (representing the future climate of an increasing area covered by beech forests in Central Europe) at the same forest site to investigate the adaptation processes in these two populations under different microclimatic conditions. For this purpose, two different techniques, i.e., nuclear microsatellites (neutral) and isozyme markers (adaptive), were applied to adult trees and natural regeneration at both slopes. Although microsatellites are considered to be neutral markers, they have been shown in several studies to give signals of selectively-driven changes. In our study, two of the five microsatellites behaved as "outlier loci", exhibiting directional selection. Our results show independent of the technique applied that natural regeneration of the southwest slope and the natural regeneration and adult trees of the northeast slope were genetically closer than the adult trees from the southwest slope. Thus, we conclude that natural selection and potential adaptation account for genetic changes and different genetic structures among the two adult populations in this case study. (C) 2012 Elsevier B.V. All rights reserved.