Landscape genomics and a common garden trial reveal adaptive differentiation to temperature across Europe in the tree species Alnus glutinosa
Landscape genomics and a common garden trial reveal adaptive differentiation to temperature across Europe in the tree species Alnus glutinosa
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DOI：
10.1111/mec.12813
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发表时间：
2014-10-01
影响因子：
4.9
通讯作者：
Mergeay, Joachim
中科院分区：
文献类型：
--
作者：
De Kort, Hanne;Vandepitte, Katrien;Mergeay, Joachim
树种科普气候变化的适应潜力具有重要的生态和经济意义。许多温带树种经历了广泛的环境条件，这表明对新环境条件的适应性很强。我们研究了适应干旱敏感树种赤杨（黑桤木）的区域气候，使用互补的方法，整合基因组，表型和景观数据。共有24个欧洲人口进行了研究，在一个共同的花园，并通过景观基因组方法。通过测序进行基因分型用于鉴定整个基因组中的SNP，得到1990个SNP。虽然检测到相对较低百分比的假定适应性SNP（2.86%离群SNP），但我们观察到离群等位基因频率、温度和植物性状之间存在明显关联。与典型的避旱特性一致，叶大小根据温度梯度而变化，并观察到与多个离群位点的显著关联，证实了所观察到的离群SNP的生态相关性。此外，缺乏隔离的距离，种群之间的遗传分化非常低，高种群内的遗传变异都支持的概念，高基因交换与强大的环境选择相结合，促进适应环境的线索。
The adaptive potential of tree species to cope with climate change has important ecological and economic implications. Many temperate tree species experience a wide range of environmental conditions, suggesting high adaptability to new environmental conditions. We investigated adaptation to regional climate in the drought-sensitive tree species Alnus glutinosa (Black alder), using a complementary approach that integrates genomic, phenotypic and landscape data. A total of 24 European populations were studied in a common garden and through landscape genomic approaches. Genotyping-by-sequencing was used to identify SNPs across the genome, resulting in 1990 SNPs. Although a relatively low percentage of putative adaptive SNPs was detected (2.86% outlier SNPs), we observed clear associations among outlier allele frequencies, temperature and plant traits. In line with the typical drought avoiding nature of A.glutinosa, leaf size varied according to a temperature gradient and significant associations with multiple outlier loci were observed, corroborating the ecological relevance of the observed outlier SNPs. Moreover, the lack of isolation by distance, the very low genetic differentiation among populations and the high intrapopulation genetic variation all support the notion that high gene exchange combined with strong environmental selection promotes adaptation to environmental cues.