Glycan-induced pathogen-suppressing soil bacteria for biocontrol applications

Overview

This solution offers a new biocontrol strategy for suppressing fungal and oomycete plant pathogens using soil-dwelling bacteria from the Bacteroidetes phylum, specifically Chitinophaga and related species. Unlike widely used Bacillus-based biocontrol products, these bacteria are naturally integrated into agricultural soils and can be activated using tailored glycan signals rather than genetic modification. When Chitinophaga detects glycans derived from pathogen cell walls, it secretes a powerful mix of cell wall-degrading enzymes and fungicidal peptides that block pathogen proliferation. The approach has shown promising results in protecting pea plants from Aphanomyces, achieving a 70% reduction in disease symptoms in greenhouse trials.

Technical specifications

Key features:

• Chitinophaga and related Bacteroidetes species detect glycan signal molecules from fungal and oomycete cell walls
• Glycan recognition triggers secretion of proteases, chitinases, diverse beta-glucanases, and anti-fungal peptides
• Pathogen suppression is achieved without genetic engineering by providing tailored complex carbohydrate (glycan) supplements
• Cell-free secretomes demonstrate strong growth inhibition of oomycetes, with enzymatic cell wall deconstruction being only one component of the mechanism
• Greenhouse validation in pea plants showed a 70% reduction in Aphanomyces symptoms using glycan-induced Chitinophaga root soaks (25 seedlings per group, three replicates)

Technology readiness level

The technology has been validated at the laboratory scale through enzymology, microbiology, and plant protection studies. Proof-of-concept data confirm that glycan-induced Chitinophaga secretomes effectively inhibit pathogen growth and reduce disease symptoms in planta. The next phase of validation involves isolating defined glycans from diverse fungal and oomycete cell walls and systematically mapping the pathogen-suppressing enzymes and peptides induced by each glycan in the library. The researchers are seeking support for experimental costs and a partner to conduct larger-scale plant protection studies, indicating the technology is at an early-to-mid stage of development requiring further validation before commercial deployment.