Synthetic community derived from grafted watermelon rhizosphere provides protection for ungrafted watermelon against Fusarium oxysporum via microbial synergistic effects

Summary

This study isolated and characterised 16 core bacterial strains from the rhizosphere of grafted watermelon plants to construct a synthetic community (SynCom) that enhanced disease resistance in ungrafted watermelon against Fusarium oxysporum in non-sterile soil. Through metabolomic analysis and co-culture experiments, the authors identified Pseudomonas as a pivotal taxon and selected eight synergistically interacting bacterial species that provided equivalent protection to the original 16-strain community. The findings demonstrate that functional microbial synergistic interactions in the rhizosphere can mitigate soil-borne diseases, offering potential for sustainable disease management in horticulture.

UK applicability

Whilst the specific pathogen and crop management context (grafted watermelon) reflect intensive horticulture practices more common in Asia, the principles of using synthetic rhizosphere communities to enhance disease resistance are potentially applicable to UK protected cropping systems. However, UK field conditions, soil microbiota composition, and regulatory frameworks for microbial inoculants may require local validation before practical deployment.

Key measures

Plant growth parameters; Fusarium oxysporum disease incidence/severity; relative abundance of bacterial taxa (amplicon sequencing); metagenome data; biofilm-forming pathway abundance; in vitro co-culture synergistic interactions; bacterial metabolite profiles

Outcomes reported

The study measured plant growth promotion and disease resistance in ungrafted watermelon inoculated with a synthetic community (SynCom) of 16 bacterial strains derived from grafted watermelon rhizosphere, and assessed the relative abundance of bacterial taxa and biofilm-forming pathways. A simplified eight-strain SynCom was developed and shown to provide equivalent plant-promoting and disease-protective effects to the original 16-strain community.

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