Biochar reshapes plant–microbe interactions in wheat, offering new pathway to sustainable agriculture
image: Biochar amendment modulates root metabolome and rhizosphere microbiome of wheat
Credit: Hanyue Yang, Patricia Kerner, Xi Liang, Ethan Struhs, Amin Mirkouei & Yaqi You
A new study reveals that biochar, a carbon-rich material made from biomass, can fundamentally reprogram how plants and soil microbes interact. By altering both plant root chemistry and the surrounding microbial community, biochar may provide a powerful tool for improving crop productivity while reducing environmental impacts.
The research, published in Biochar, used wheat as a model system to uncover how different types of biochar influence the rhizosphere, the narrow zone of soil surrounding plant roots that plays a critical role in plant health.
“Biochar does not just improve soil as a physical material,” said corresponding author Yaqi You. “It actively reshapes the chemical signals produced by plant roots and reorganizes the microbial communities around them, creating a more beneficial environment for plant growth.”
To investigate this process, the team tested biochar made from four different feedstocks, including corn stover, cattle manure, pine sawdust, and wheat straw, applied at two rates. They then analyzed changes in root metabolites and microbial communities using advanced metabolomics and DNA sequencing techniques.
The results showed that biochar triggered widespread changes in plant root metabolism. In particular, amino acid metabolism was strongly affected, leading to cascading changes in a wide range of secondary metabolites. These compounds are known to act as signaling molecules that help plants communicate with microbes and defend against stress.
At the same time, biochar significantly increased the diversity of microbes in the rhizosphere and reshaped their community structure. Beneficial microbial groups associated with nutrient cycling and plant growth were enriched, while others declined. The study also found stronger connections among microbes, suggesting that biochar promotes more cooperative and stable microbial networks.
One key finding was that the type of biochar used had a greater impact than how much was applied. Among all treatments, biochar derived from wheat straw at a low application rate of 0.25 percent produced the strongest and most distinct effects. This treatment enhanced both plant metabolic activity and microbial interactions, indicating a highly coordinated response between plants and soil microbes.
The researchers also identified important shifts in microbial functions related to nitrogen and carbon cycling. For example, increases in certain bacteria may help reduce emissions of greenhouse gases such as nitrous oxide and methane, while supporting nutrient availability for plants.
“These findings suggest that we can design biochar materials to guide plant–microbe interactions in a targeted way,” You said. “This opens the door to a new strategy for sustainable agriculture, where we engineer the rhizosphere to enhance crop resilience and productivity.”
The study highlights the concept of “rhizosphere microbiome engineering,” where biochar acts as a top-down tool to influence both plant chemistry and microbial ecology. By tuning biochar properties such as feedstock and surface chemistry, it may be possible to optimize outcomes for different crops and environments.
While the experiments were conducted under controlled conditions, the authors emphasize the need for future field studies to confirm these effects across real agricultural systems. They also note that understanding how biochar properties influence biological processes will be essential for scaling up its use.
Overall, the research provides new mechanistic insights into how biochar works at the interface of soil, plants, and microbes. By bridging these systems, biochar could play a key role in developing more sustainable and climate-resilient agricultural practices.
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Journal Reference: Yang, H., Kerner, P., Liang, X. et al. Biochar amendment modulates root metabolome and rhizosphere microbiome of wheat. Biochar 7, 46 (2025).
https://doi.org/10.1007/s42773-025-00434-6
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About Biochar
Biochar (e-ISSN: 2524-7867) is the first journal dedicated exclusively to biochar research, spanning agronomy, environmental science, and materials science. It publishes original studies on biochar production, processing, and applications—such as bioenergy, environmental remediation, soil enhancement, climate mitigation, water treatment, and sustainability analysis. The journal serves as an innovative and professional platform for global researchers to share advances in this rapidly expanding field.