The evolution of adaptive genetic variation in relation to speciation divergence and introgression in conifers

与针叶树物种分化和基因渗入相关的适应性遗传变异的进化

• 批准号: RGPIN-2016-05415
• 负责人: Bousquet, Jean
• 金额: $ 3.21万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=631684
• 关键词: evolution; adaptive; genetic; variation; relation

Boreal conifers are among the living organisms with largest natural distributions. They are usually characterized by high genetic diversity and gene flow. We have shown that history has been an important factor in shaping this diversity given the existence of distinct geneticlineages at the intraspecific level, that have emerged as a result of vicariance during ice ages. This isolation may also have resulted in differential adaptation given thedifferent climates characterizing glacial refugia, in addition to more recent natural selection during Holocene, following the retreat of glaciers andrecolonization. We have also shown that this post-glacial colonization has also resulted in the existence of contact zones between hybridizing species andbetween intraspecific lineages, respectively called hybrid or suture zones. Therefore, genetic diversity can be highly structured in these zones, with different patterns observed for different genomes and even among genomic regions within the nuclear genome.

北方针叶树是自然分布最广的生物之一。它们通常具有较高的遗传多样性和基因流动的特点。我们已经证明，在形成这种多样性的过程中，历史是一个重要因素，因为在种内水平上存在着不同的遗传谱系，这些遗传谱系是在冰河期变异的结果。这种隔离也可能导致不同的适应，因为不同的气候特征是冰川避难所，除了最近的自然选择在全新世，冰川退缩和重新殖民。我们还表明，这种冰川后的定殖也导致杂交物种之间和种内谱系之间存在接触带，分别称为杂交带或缝合带。因此，遗传多样性可以在这些区域高度结构化，在不同的基因组中甚至在核基因组的基因组区域中观察到不同的模式。