Over 90% of terrestrial plant species are associated with plant symbiotic fungus, which plays a crucial role in the worldwide agroecosystems and forest ecosystems. The plants-fungi mutualistic systems provide the hosts with various benefits, such as increasing mineral absorption and resistance to biotic and abiotic stressors; in exchange, host plants provide habitats and accessible carbon resources for fungal reproduction. However, in natural ecosystems, plants are often subjected to changeable soil nutrient conditions, such as phosphorus (P) and nitrogen (N) deficiency, and ammonium accumulation, which enhance or weaken plant-fungi symbiosis and the degree of mutual benefits. Additionally, anthropogenic chemical fertilizer application has led to an unbalanced distribution of various nutrient resources in the soil, including N and P. The primary and secondary metabolism, phytohormone signal, and immunological response of host plants are all variably modulated by changes in soil nutrient levels and forms; these pathways play a role in the overall plant-fungal symbiosis.

A better understanding of the potential mechanisms underlying soil nutrient-regulated symbiotic plant-fungal interactions can maximize the fitness of both species and can have implications for wider ecosystem functioning. This Research Topic aims to collect Original Research and Reviews/Mini-Reviews that explore the influences of soil nutrients on plant-fungal symbiosis in agro- and forest ecosystems.

We welcome the submission of specific themes including but not limited to:
1. Mechanistic insights into the nutrient-regulated plant-fungal symbiosis in agroecosystems including sustainable agricultures
2. Insights into the influences of N deposition on ectomycorrhizal fungi-host symbiosis in the forest ecosystems
3. Response of symbiotic fungal diversity and ecosystem functioning under global change
4. Nutrient-plant-symbiotic fungal endophyte interactions.
5. Effects of soil heavy metal on plant-fungal symbiosis
6. Mechanistic insights into the nutrient-regulated facultative fungal symbiotic association with host plants

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Frontiers in Microbiology

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