Summary
This experimental study demonstrates a plant-mediated 'cry for help' mechanism in disease-suppressive soil formation, wherein repeated pathogen exposure triggers cucumber plants to release specific metabolites (threonic acid and lysine) that selectively recruit beneficial Bacillus and Sphingomonas species. These enriched microbes suppress Fusarium infection by elevating root ROS levels through activation of pathways associated with bacterial stress response and motility. The findings suggest that disease suppression in conditioned soil relies on dynamic plant–microbe signalling rather than passive pathogen exclusion alone.
UK applicability
The mechanisms identified may have relevance to UK protected horticulture (particularly greenhouse cucumber production where Fusarium wilts are problematic), though confirmation would require field validation under cooler temperate conditions. The study's use of a split-root system and monoculture conditions may not fully replicate the biological complexity of UK field soils, limiting direct application to outdoor vegetable systems.
Key measures
Disease incidence reduction across generations; root ROS concentration (primarily hydroxyl radicals); relative abundance of Bacillus and Sphingomonas; enriched bacterial pathways (two-component system, secretion system, flagellar assembly); concentrations of threonic acid and lysine; in vitro biocontrol efficacy
Outcomes reported
The study measured disease incidence, root reactive oxygen species (ROS) levels, microbial community composition, and metabolite profiles across eight consecutive generations of cucumber inoculated with Fusarium oxysporum f.sp. cucumerinum in conditioned soil. It identified Bacillus and Sphingomonas as key beneficial microbes enriched during disease suppression, and determined that threonic acid and lysine were pivotal metabolites for their recruitment.
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