Multifunctionality and microbial communities in agricultural soils regulate the dynamics of a soil-borne pathogen.

Aims: Determining the soil factors that drive the dynamics of soil-borne pathogens is an essential step toward the formulation and implementation of strategies for the control of plant diseases. Methods: We sampled 48 healthy and infected soils in peanut fields from six counties in Eastern China to explore the relationships between soil multifunctionality, microbial communities, and peanut stem rot pathogen, Athelia rolfsii. Results: The results showed that peanut stem rot infection did not affect soil microbial richness, but it increased soil multifunctionality, altered the microbial community composition, and decreased the complexity of microbial co-occurrence networks significantly. Soil biotic and abiotic factors had markedly effects on A. rolfsii, and specific soil functions and microbial taxa were significantly associated with A. rolfsii abundance. Soil multifunctionality and microbial community compositions negatively affected A. rolfsii abundance, while the effects of bacterial and fungal richness were contrasting for healthy and infected soils. Longitude and latitude indirectly and positively affected A. rolfsii abundance. Conclusions: The results demonstrate that soil multifunctionality and microbial communities play a vital role in regulating the dynamics of peanut stem rot pathogen, which could enhance our understanding of the relationships between soil factors, pathogen dynamics, and plant health. [ABSTRACT FROM AUTHOR]