Recurrent hybridization and gene flow shaped Norway and Siberian spruce evolutionary history over multiple glacial cycles

IF 4.5 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecular Ecology Pub Date : 2024-08-15 DOI:10.1111/mec.17495
Qiujie Zhou, Piyal Karunarathne, Lili Andersson-Li, Chen Chen, Lars Opgenoorth, Katrin Heer, Andrea Piotti, Giovanni Giuseppe Vendramin, Elena Nakvasina, Martin Lascoux, Pascal Milesi
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Abstract

Most tree species underwent cycles of contraction and expansion during the Quaternary. These cycles led to an ancient and complex genetic structure that has since been affected by extensive gene flow and by strong local adaptation. The extent to which hybridization played a role in this multi-layered genetic structure is important to be investigated. To study the effect of hybridization on the joint population genetic structure of two dominant species of the Eurasian boreal forest, Picea abies and P. obovata, we used targeted resequencing and obtained around 480 K nuclear SNPs and 87 chloroplast SNPs in 542 individuals sampled across most of their distribution ranges. Despite extensive gene flow and a clear pattern of Isolation-by-Distance, distinct genetic clusters emerged, indicating the presence of barriers and corridors to migration. Two cryptic refugia located in the large hybrid zone between the two species played a critical role in shaping their current distributions. The two species repeatedly hybridized during the Pleistocene and the direction of introgression depended on latitude. Our study suggests that hybridization helped both species to overcome main shifts in their distribution ranges during glacial cycles and highlights the importance of considering whole species complex instead of separate entities to retrieve complex demographic histories.

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反复杂交和基因流动塑造了挪威和西伯利亚云杉在多个冰川周期中的进化史。
大多数树种在第四纪都经历了收缩和扩张的周期。这些周期形成了古老而复杂的遗传结构,此后又受到广泛的基因流动和强烈的地方适应性的影响。在这种多层次的遗传结构中,杂交在多大程度上发挥了作用,这一点亟待研究。为了研究杂交对欧亚北方森林的两个优势种群--欧鼠李和欧鼠李--的联合种群遗传结构的影响,我们采用了靶向重测序技术,在它们分布范围的大部分地区采样的 542 个个体中获得了约 480 K 个核 SNPs 和 87 个叶绿体 SNPs。尽管存在广泛的基因流动和明显的 "距离隔离"(Isolation-by-Distance)模式,但还是出现了不同的基因群,表明存在迁移的障碍和走廊。位于这两个物种之间的大型杂交区的两个隐蔽的避难所对它们目前的分布起了关键作用。这两个物种在更新世期间反复发生杂交,其引入方向取决于纬度。我们的研究表明,杂交帮助这两个物种克服了冰川周期中分布范围的主要变化,并强调了考虑整个物种复合体而不是单独的实体来检索复杂的人口历史的重要性。
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来源期刊
Molecular Ecology
Molecular Ecology 生物-进化生物学
CiteScore
8.40
自引率
10.20%
发文量
472
审稿时长
1 months
期刊介绍: Molecular Ecology publishes papers that utilize molecular genetic techniques to address consequential questions in ecology, evolution, behaviour and conservation. Studies may employ neutral markers for inference about ecological and evolutionary processes or examine ecologically important genes and their products directly. We discourage papers that are primarily descriptive and are relevant only to the taxon being studied. Papers reporting on molecular marker development, molecular diagnostics, barcoding, or DNA taxonomy, or technical methods should be re-directed to our sister journal, Molecular Ecology Resources. Likewise, papers with a strongly applied focus should be submitted to Evolutionary Applications. Research areas of interest to Molecular Ecology include: * population structure and phylogeography * reproductive strategies * relatedness and kin selection * sex allocation * population genetic theory * analytical methods development * conservation genetics * speciation genetics * microbial biodiversity * evolutionary dynamics of QTLs * ecological interactions * molecular adaptation and environmental genomics * impact of genetically modified organisms
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