Researchers from the University of Oklahoma (led by Jizhong Zhou and colleagues) conducted a long-term field experiment at the Kessler Atmospheric and Ecological Field Station, a temperate grassland site in Oklahoma. They used infrared lamps to warm plots by about 3°C above ambient temperatures for over a decade (samples spanned before and during the warming period, roughly 2009–2020+).

Warming boosts soil nitrogen availability, favoring certain bacteria. Resistance genes appear to “hitchhike” with adaptive traits like thermal tolerance and nitrogen assimilation. Horizontal gene transfer can further spread them. This represents co-selection and positive selection at genomic, ecological, and evolutionary levels.

This is the first real-world, decade-scale field study of its kind, providing stronger causal evidence than shorter lab or shorter-term experiments. Uncertainties remain about exact translation to global scales or human health outcomes, but it adds to concerns about climate change amplifying existing antimicrobial resistance challenges (already responsible for millions of difficult-to-treat infections annually).

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Decade-long warming accelerates antibiotic resistance in grassland soils

Title: Decade-long warming accelerates antibiotic resistance in grassland soils

Journal: Nature 

Publication Date: April 22, 2026

DOI: 10.1038/s41586-026-10413-x

Authors: Linwei Wu, 
Da-Shuai Mu, 
Jing An, 
Yanan Wang, 
Xiaomin Fan, 
De-Chen Lu, 
Ya Zhang, 
Yinan Xie, 
Jonathan Michael, 
Daniel Curtis, 
Yupeng Fan, 
Yajiao Wang, 
Xue Guo, 
Qichao Tu, 
Qingyun Yan, 
Qun Gao, 
Zhili He, 
Ye Deng, 
Kai Xue, 
Liyou Wu, 
Daliang Ning, 
Xuanyu Tao, 
Yunfeng Yang & 
Jizhong Zhou

Abstract

Soils are critical reservoirs of antibiotic-resistance genes (ARGs)^1,2, which are strongly shaped by microbial interactions and environmental conditions and are therefore highly sensitive to disturbance^2,3,4,5,6. Although climate warming is recognized as one of the most significant disturbances to microbial communities and their functions^7,8,9,10, its impacts on soil resistomes remain poorly understood. Here we investigated the effects of decade-long experimental warming on ARGs in grassland soils using integrated experimental and computational approaches. Our results revealed that ARG abundance substantially increased (23.9%) under warming—particularly glycopeptide- and rifamycin-resistance genes. Warming specifically enriched Actinomycetota hosts, including various potential plant pathogens, and enhanced ARG mobility. Large-scale unprecedented isolates-based phenotypic analyses also validated that warming increased bacterial resistance to multiple antibiotics. Further mechanistic analyses revealed that warming increased ARG abundance primarily through co-selection of resistance genes physically linked to adaptive traits (for example, thermal tolerance and nitrogen assimilation) and positive selection for thermal tolerance genes, which could be further amplified via horizontal gene transfer. Together, these findings convincingly demonstrate that climate warming substantially accelerates soil antibiotic resistance at genomic, ecological and evolutionary levels, with broad implications for public health and environmental sustainability in a warming world.

The study leveraged a unique long-term experimental warming setup at the Kessler Atmospheric and Ecological Field Station (a temperate grassland in Oklahoma). Plots were warmed by ~3°C using infrared lamps for over a decade, with soil samples collected before and throughout the treatment.

Sustained warming increased the abundance of antibiotic resistance genes (ARGs) by ~23.9%.

It also boosted ARG diversity and mobility (potential for spread via horizontal gene transfer).

Particular increases in genes conferring resistance to glycopeptides and rifamycins.

Actinomycetota (a phylum including many Actinobacteria) were selectively enriched as ARG hosts, including some potential plant pathogens.

Large-scale phenotypic validation: >2,000 bacterial isolates tested, generating >25,000 susceptibility measurements. Bacteria from warmed soils showed significantly higher resistance across multiple antibiotic classes.

Warming alters soil conditions (e.g., increased nitrogen availability), which:

1. Favors bacteria carrying resistance genes that are physically linked to adaptive traits (thermal tolerance, nitrogen assimilation) — a form of genetic hitchhiking/co-selection.
2. Promotes positive selection for thermal tolerance genes.
3. Enhances horizontal gene transfer, amplifying the spread of ARGs.

This demonstrates effects at genomic, ecological, and evolutionary levels.

A companion perspective or related work in the same period also highlighted drought’s role in concentrating antibiotics in soil and promoting resistance.

The full paper is behind Nature’s paywall.