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Simulating Temperature in a Soil Incubation Experiment
Published on: October 28, 2022
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Pangenomes suggest ecological-evolutionary responses to experimental soil warming
Mallory J Choudoir1,2, Achala Narayanan1,3, Damayanti Rodriguez-Ramos1,4
1Department of Microbiology, University of Massachusetts Amherst, Amherst, Massachusetts, USA.
Msphere
|March 19, 2025
Summary
Microbial evolution in warming soils shows adaptation in carbon use and growth efficiency. These genomic changes in bacteria may alter soil
Area of Science:
- Microbial Ecology
- Genomics
- Climate Change Science
Background:
- Soil microbes drive carbon cycling, crucial for climate regulation.
- Climate change, particularly soil warming, can alter microbial functions and evolutionary trajectories.
- Understanding microbial adaptation to warming is key to predicting soil ecosystem responses.
Purpose of the Study:
- To investigate the genomic adaptations of soil bacteria to long-term experimental warming.
- To identify evolutionary signatures in bacterial lineages exposed to chronic soil heating (5°C above ambient for over 30 years).
- To assess how these adaptations influence microbial carbon utilization and growth efficiency.
Main Methods:
- Isolation and sequencing of bacterial genomes from long-term heated and control soil plots.
- Comparative pangenomics to identify accessory gene clusters and functional gene content.
- Analysis of codon usage bias as an indicator of growth efficiency and selective pressures.
Main Results:
- Genomes from heated plots showed enrichment in carbohydrate and nitrogen metabolism pathways.
- Genomes from control plots were enriched in amino acid and fatty acid metabolism pathways.
- Bacterial genomes from heated plots exhibited reduced codon bias, suggesting altered growth efficiency.
Conclusions:
- Long-term soil warming drives microbial evolutionary responses, including lineage-specific trends.
- Adaptations in carbon and nitrogen metabolism, and growth efficiency, are key responses to chronic warming.
- These microbial evolutionary changes may represent novel feedback mechanisms in the climate system.
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