Numerous biological control agents (BCAs) have been studied, but only a limited number of strains from the genera Bacillus, Pseudomonas, Streptomyces, Trichoderma, Coniothyrium, and Gliocladium and nonpathogenic Fusarium have been commercially developed.
Interest in the biocontrol of Fusarium wilts using antagonistic microorganisms has recently been renewed due to the absence of effective chemical control methods. Controlling vascular wilt pathogens is difficult due to the lack of efficient curative treatments for infected plants and the pathogens’ ability to survive for a long time in soil without a host plant. is a ubiquitous soil-borne phytopathogen that can cause vascular wilt in many widely cultivated crops. This strain has the potential to be developed as a novel biological control agent of soil-borne Fusarium wilt.įusarium oxysporum Schlecht.
strain EGB controlled cucumber Fusarium wilt by migrating to the plant root and regulating the soil microbial community. The predatory myxobacterium Corallococcus sp. Several predatory bacteria, such as Lysobacter, Microvirga, and Cupriavidus, appearing as hubs or indicators, showed intensive connections with other bacteria. Cooccurrence network analysis of the soil microbiome indicated a decreased modularity and community number but an increased connection number per node after the application of strain EGB. Spatiotemporal analysis of the soil microbial community showed that strain EGB migrated towards the roots and root exudates of the cucumber plants via chemotaxis. Strain EGB adapted to the soil environment well and decreased the abundance of soil-borne FOC efficiently. ResultsĪ greenhouse and a 2-year field experiment demonstrated that the solid-state fermented strain EGB significantly reduced the cucumber Fusarium wilt by 79.6% (greenhouse), 66.0% (2015, field), and 53.9% (2016, field). strain EGB in the soil and its effect on the soil microbiome after inoculation for controlling cucumber Fusarium wilt caused by Fusarium oxysporum f. In this study, we aimed to investigate the behaviors of the myxobacterium Corallococcus sp. However, interactions among myxobacteria, plant pathogens, and the soil microbiome are largely unexplored. Some myxobacterial strains have been used to control soil-borne fungal phytopathogens. Myxobacteria are micropredators in the soil ecosystem with the capacity to move and feed cooperatively.
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