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An Optimized Enrichment Technique for the Isolation of Arthrobacter Bacteriophage Species from Soil Sample Isolates
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Phages Affect Soil Dissolved Organic Matter Mineralization by Shaping Bacterial Communities
Xiaolei Zhao1,2,3, Xiaolong Liang4, Zhenke Zhu2,3
1College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China.
Environmental Science & Technology
|January 21, 2025
Summary
Bacteriophages (phages) influence soil carbon cycling by altering bacterial communities and promoting dissolved organic matter (DOM) mineralization. Temperature affects the magnitude of these phage-driven processes.
Area of Science:
- Microbial Ecology
- Environmental Microbiology
- Biogeochemistry
Background:
- Viruses, specifically bacteriophages (phages), are known to regulate bacterial communities and terrestrial nutrient cycling.
- The precise effects of phages on bacterial metabolism and carbon (C) dynamics during dissolved organic matter (DOM) mineralization are not well understood.
Purpose of the Study:
- To investigate the impact of active and inactive phages on soil DOM mineralization and bacterial community structure.
- To elucidate the mechanisms by which phages influence carbon cycling in soil ecosystems.
Main Methods:
- Addition of active and inactive bacteriophages to soil DOM with native bacterial communities.
- Incubation experiments conducted at two different temperatures (18 °C and 23 °C) over 35 days.
- Monitoring of CO2 efflux rates, bacterial community composition, and predicted microbiome functions.
Main Results:
- Phages initially reduced CO2 efflux but significantly increased cumulative CO2 emissions, indicating enhanced DOM mineralization.
- Phages altered bacterial communities by decreasing dominant taxa and increasing diversity, promoting the growth of taxa involved in complex compound degradation.
- Higher temperatures amplified phage-bacteria interactions, bacterial diversity, and enzyme activities, leading to a 16% boost in DOM mineralization.
Conclusions:
- Phages significantly impact soil DOM mineralization by restructuring microbial communities and modifying their functions.
- Temperature acts as a modulator, influencing the magnitude of phage-driven DOM mineralization without qualitatively altering the overall process.
- These findings highlight the crucial role of viruses in soil carbon cycling and microbial ecosystem functioning.
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