Engineered rhizobacteria for corn protection against root-knot nematodes
A biocontrol solution that engineers beneficial soil bacteria to secrete maize defense peptides (ZmPeps), priming corn immunity against root-knot nematodes. This approach offers an adaptable, sustainable alternative to chemical nematicides for protecting corn yields.
Overview
Root-knot nematodes (Meloidogyne spp.) are a serious pathogen of corn, causing significant yield losses worldwide. This research proposes engineering the plant-associated rhizobacteria Bacillus subtilis to produce and secrete corn defense elicitors called plant elicitor peptides (Peps). When these bacteria naturally associate with corn roots, they secrete ZmPeps and prime the plant's immune system, providing protection against root-knot nematode infection. This biocontrol approach leverages the plant's own defense signaling pathways to combat nematode damage, offering a sustainable alternative to traditional chemical nematicides.
Technical specifications
Core approach:
- Engineering Bacillus subtilis, a non-pathogenic soil bacterium, to secrete maize ZmPep3
- Bacteria are applied to corn roots through soil watering, where they naturally colonize the root zone
- Secreted ZmPep3 acts as a Damage Associated Molecular Pattern (DAMP), triggering the plant's innate immune response
- Primed immunity provides protection against root-knot nematode infection
Key advantages:
- Builds on proven technology: Bacillus-secreted Peps have already demonstrated efficacy against root-knot nematodes in potato and tomato
- Adaptable platform: the same bacterial delivery system can be engineered with different Peps for various crops
- Sustainable pest management: reduces reliance on chemical nematicides
- Compatible with existing agricultural practices: applied through standard irrigation methods
Validation approach:
- Testing synthetic ZmPep3 application on corn roots to confirm efficacy against M. incognita
- Measuring root weights and root galling at one-month post-inoculation
- Comparing nematode infection levels between B. subtilis secreting ZmPep3 and control treatments
Technology readiness level
This technology is at an early-to-mid stage of development. The Bacillus-based peptide delivery system has been validated in potato and tomato, demonstrating proof-of-concept for the platform. Current research is extending this approach to corn by: (1) confirming that synthetic ZmPep3 induces resistance to root-knot nematodes in maize, and (2) engineering and testing B. subtilis strains that secrete ZmPep3 in corn. Successful completion of these validation steps would establish feasibility for field trials and eventual commercial development of a corn-specific biocontrol product.
About Washington State University
Washington State University is a comprehensive public land‑grant research university serving the state through a multi‑campus system anchored in Pullman. Industry engagement runs through a research and technology park in Pullman, a health sciences campus in Spokane integrated with regional hospitals, and a statewide extension network linking faculty with companies and communities. The Tri‑Cities campus sits minutes from a U.S. Department of Energy national lab, enabling collaborations, shared facilities access, and talent pipelines for regulated sectors. Research is supported by competitive federal funding from agencies such as NSF, NIH, USDA, DOE, and DoD. A dedicated technology transfer office manages IP, licensing, and startup support, complemented by incubator and pilot‑scale resources.
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