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探索种群中与干旱胁迫相关的基因组变异。

Exploring genomic variation associated with drought stress in populations.

作者信息

Napier Joseph D, de Lafontaine Guillaume, Hu Feng Sheng

机构信息

Department of Plant Biology University of Illinois Urbana IL USA.

Department of Integrative Biology The University of Texas at Austin Austin TX USA.

出版信息

Ecol Evol. 2020 Aug 4;10(17):9271-9282. doi: 10.1002/ece3.6614. eCollection 2020 Sep.

Abstract

Predicted increases in drought and heat stress will likely induce shifts in species bioclimatic envelopes. Genetic variants adapted to water limitation may prove pivotal for species response under scenarios of increasing drought. In this study, we aimed to explore this hypothesis by investigating genetic variation in 16 populations of black spruce () in relation to climate variables in Alaska. A total of 520 single nucleotide polymorphisms (SNPs) were genotyped for 158 trees sampled from areas of contrasting climate regimes. We used multivariate and univariate genotype-by-environment approaches along with available gene annotations to investigate the relationship between climate and genetic variation among sampled populations. Nine SNPs were identified as having a significant association with climate, of which five were related to drought stress response. Outlier SNPs with respect to the overall environment were significantly overrepresented for several biological functions relevant for coping with variable hydric regimes, including osmotic stress response. This genomic imprint is consistent with local adaptation of black spruce to drought stress. These results suggest that natural selection acting on standing variation prompts local adaptation in forest stands facing water limitation. Improved understanding of possible adaptive responses could inform our projections about future forest dynamics and help prioritize populations that harbor valuable genetic diversity for conservation.

摘要

预计干旱和热应激的增加可能会导致物种生物气候包络线发生变化。适应水分限制的基因变异可能对干旱加剧情况下的物种反应至关重要。在本研究中,我们旨在通过调查阿拉斯加16个黑云杉()种群的遗传变异与气候变量的关系来探讨这一假设。从气候条件不同的地区采集了158棵树,对其总共520个单核苷酸多态性(SNP)进行了基因分型。我们使用多变量和单变量基因型-环境方法以及可用的基因注释来研究采样种群中气候与遗传变异之间的关系。九个SNP被确定与气候有显著关联,其中五个与干旱胁迫反应有关。在应对可变水分状况相关的几个生物学功能方面,相对于整体环境的异常SNP显著富集,包括渗透胁迫反应。这种基因组印记与黑云杉对干旱胁迫的局部适应性一致。这些结果表明,作用于现有变异的自然选择促使面临水分限制的林分发生局部适应。对可能的适应性反应的更好理解可以为我们对未来森林动态的预测提供信息,并有助于确定具有宝贵遗传多样性的种群进行保护的优先级。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f84e/7487243/f440a3238441/ECE3-10-9271-g001.jpg

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