Elucidating Continental-Wide Phylogeographic and Adaptive Processes Shaping the Genome-Wide Diversity of North America's Most Widely Distributed Tree
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View abstract on PubMed
Summary
This summary is machine-generated.Pleistocene and Holocene climate changes shaped quaking aspen (Populus tremuloides) genetic diversity. Genomic analysis reveals distinct lineages and adaptive SNPs, offering insights into regional adaptation and climate change resilience.
Area Of Science
- Evolutionary Biology
- Genomics
- Ecology
Background
- Past climate shifts profoundly influenced species' genetic structure and adaptive variation.
- Understanding historical processes is crucial for explaining current genetic diversity and adaptation.
Purpose Of The Study
- Investigate historical population dynamics of Populus tremuloides across North America.
- Identify genomic signatures of regional and local adaptation.
- Assess the impact of past climate change on genetic diversity.
Main Methods
- Sequencing data from 1903 Populus tremuloides individuals.
- Analysis of historical population dynamics and demographic history.
- Identification of genotype-environment associations and adaptive SNPs.
Main Results
- Northern and western aspen lineages showed population expansion; the southern lineage experienced a bottleneck.
- The earliest lineage split occurred in the southern distribution range.
- Adaptive SNPs on chromosomes 2 and 8 suggest suppressed recombination maintaining adaptation.
Conclusions
- Historical climate oscillations significantly shaped quaking aspen phylogeography and adaptive variation.
- Genomic regions on chromosomes 2 and 8 are key to regional and local adaptation.
- Findings inform predictions of species' responses to future climate change.
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