Mycorrhizal Fungal Interactions in Plant Systems

Mycorrhizal fungi form ancient and widespread symbioses with the majority of terrestrial plants, shaping nutrient cycles, soil structure and ecosystem productivity. Through extensive hyphal networks, these fungi forage for mineral nutrients—particularly phosphorus and nitrogen—and deliver them to plant roots in exchange for photosynthetically fixed carbon. Two principal forms of association dominate: arbuscular mycorrhizas, in which fungi penetrate root cortical cells to form finely branched arbuscules, and ectomycorrhizas, where hyphae sheath roots and extend between cells. These partnerships enhance plant growth, water relations and stress tolerance, and influence plant community composition through common mycorrhizal networks that interconnect individuals. Recent advances reveal how fungal networks self-organise to balance trade-offs between construction costs and resource delivery, how plant hosts regulate fungal colonisation via transcriptional feedback loops, and how soil microbial context determines the outcome of large-scale inoculation. Harnessing this knowledge offers promising routes to sustainable agriculture and forestry by optimising biofertilisation, improving crop resilience to abiotic stress and reducing reliance on chemical inputs.

Research from Nature Portfolio

Recent studies have shown that mycorrhizal fungi construct their extraradical networks as self-regulating travelling waves, whereby pulses of growing hyphal tips expand nutrient-absorbing mycelium. This strategy minimises carbon investment while extending exploration beyond depleted zones, maintaining efficient long-distance transport back to the root and dynamically adding network loops to optimise resource sharing with plant partners. In parallel, field trials across multiple agricultural sites have demonstrated that soil microbiome indicators—particularly the abundance of pathogenic fungi—can predict maize growth responses to arbuscular mycorrhizal inoculation with high accuracy. This approach paves the way for site-specific microbiome engineering to improve inoculation success and sustainability in crop management. At the molecular level, research in a model legume has uncovered a transcriptional negative feedback loop in which plant transcription factors promote lipid efflux to the fungus while simultaneously activating repressors that constrain arbuscule development. This regulatory circuit enables the host to fine-tune nutrient exchange and maintain a mutually beneficial symbiosis under varying environmental conditions.

Mycorrhizal Fungal Interactions in Plant Systems publication trend

The graph below shows the total number of articles in mycorrhizal fungal interactions in plant systems across all publications each year (not limited to Nature Index journals).

Technical terms

Arbuscular mycorrhizal fungi (AMF): A group of obligate biotrophic fungi forming intracellular associations with most land plants, facilitating nutrient exchange through highly branched structures called arbuscules.

Hyphae: Thread-like fungal filaments that extend into the soil or root tissues, forming networks for nutrient uptake and transport.

Arbuscule: A finely branched, tree-like fungal structure formed inside root cortical cells where nutrient exchange occurs.

Cytoplasmic flow: The movement of organelles and solutes within fungal hyphae, critical for long-distance transport of nutrients.

Mycorrhizosphere: The zone of soil influenced by root-fungus interactions, including associated microbial communities.

Negative feedback loop: A regulatory circuit in which a product of a pathway inhibits its own synthesis or function to maintain system homeostasis.

References

1. A travelling-wave strategy for plant–fungal trade. Nature (2025).
2. Mycorrhizal Symbiosis in Plant Growth and Stress Adaptation: From Genes to Ecosystems. Annual Review of Plant Biology (2023).
3. Soil microbiome indicators can predict crop growth response to large-scale inoculation with arbuscular mycorrhizal fungi. Nature Microbiology (2023).
4. Control of arbuscule development by a transcriptional negative feedback loop in Medicago. Nature Communications (2023).
5. A tripartite bacterial-fungal-plant symbiosis in the mycorrhiza-shaped microbiome drives plant growth and mycorrhization. Microbiome (2024).