nature.tvMycorrhizal Networks
Mycorrhizal fungi form symbiotic networks linking plant roots, shuttling nutrients and signals across ecosystems in ways that reshape how we understand forest interdependence.
Mycorrhizal networks consist of microscopic fungal hyphae that extend far beyond plant roots, acting as extensions of the root system. These fungi absorb water and immobile nutrients like phosphorus and nitrogen, trading them for sugars from the plant. The resulting mutualism allows even shaded seedlings to access resources otherwise out of reach, especially in nutrient-poor soils.
The networks operate as both supply lines and communication channels. Research shows that when one plant is attacked by pests, it can send chemical warning signals through the fungal web, prompting neighboring plants to upregulate defenses. Some studies also indicate resource transfer between different plant species, such as from Douglas fir to paper birch, especially in shaded conditions.
This underground collaboration is not uniform—it’s shaped by environmental conditions and species compatibility. Different fungi specialize in different roles: some focus on phosphorus uptake, others on nitrogen or water. The structure of the network can shift seasonally, with connections strengthening or weakening as plant needs change across the year.
