Entomopathogenic Nematode-Bacterial Interactions
Summary
Entomopathogenic nematodes (EPNs) and their mutualistic bacteria form intricately coordinated partnerships that drive potent insect‐killing processes. Free‐living nematodes of the genera Steinernema and Heterorhabditis harbour symbiotic Xenorhabdus and Photorhabdus bacteria within specialised intestinal structures. Infective juveniles seek and invade insect hosts, releasing their bacterial partners into the insect haemocoel. Once liberated, the bacteria multiply, secrete a suite of bioactive toxins and enzymes that rapidly kill the insect, and produce antimicrobial compounds to defend the cadaver against competitors. Meanwhile, the nematodes feed on the bacteria and degraded host tissue, reproduce within the insect carcass, and emerge as a new generation of infective juveniles carrying their bacterial symbionts. This multipartite lifecycle underpins a globally important biocontrol strategy, reducing dependence on chemical pesticides, and has inspired the discovery of novel toxin complexes, antimicrobial metabolites and biotechnological applications. Recent research has expanded our understanding of symbiont population structure, toxin assembly, host‐range evolution and the broader nematode‐associated microbiota, highlighting both fundamental ecological dynamics and avenues for enhanced pest management.
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Entomopathogenic Nematode-Bacterial Interactions publication trend
The graph below shows the total number of articles in entomopathogenic nematode-bacterial interactions across all publications each year (not limited to Nature Index journals).
Technical terms
Entomopathogenic nematode (EPN): A soil‐dwelling nematode that parasitises insects in association with symbiotic bacteria.
Mutualistic symbiont: A bacterium that lives in close association with a host organism, providing and receiving benefits.
Infective juvenile (IJ): The specialised, non‐feeding stage of an EPN that carries symbiotic bacteria to new insect hosts.
Toxin complex (e.g. ABC toxin): A multi‐component protein assembly secreted by bacteria that forms pores in host cell membranes to deliver cytotoxic effectors.
Pathobiome: The collective microbial community associated with a host that contributes to disease processes and virulence.
References
- Host Association and Spatial Proximity Shape but Do Not Constrain Population Structure in the Mutualistic Symbiont Xenorhabdus bovienii. mBio (2023).
- Recent insights into mechanisms of cellular toxicity and cell recognition associated with the ABC family of pore-forming toxins. Biochemical Society Transactions (2023).
- Entomopathogenic nematode-associated microbiota: from monoxenic paradigm to pathobiome. Microbiome (2020).
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