Fungistatic volatile organic compounds from chromobacterium spp. for post-harvest crop protection

Overview

This research program centers on the discovery and development of volatile organic compounds (VOCs) produced by Chromobacterium spp. as a natural biocontrol strategy for reducing post-harvest fungal losses in fruits and vegetables. The team has demonstrated that VOCs emitted by Chromobacterium vaccinii and related bacterial isolates from bog soils inhibit the growth of fungal pathogens responsible for cranberry post-harvest rot, including Phoma, Colletotrichum, and Coleophoma. Importantly, the same compounds show activity against a broad range of fungal targets, including human dermatophytes, Trichoderma, and Phytophthora cinnamomi, suggesting significant versatility across agricultural and clinical applications.

The value proposition for industry partners lies in the potential to develop a new class of biofungicides or post-harvest treatments derived from naturally produced volatiles. Such an approach could reduce dependence on synthetic chemical fungicides, address growing consumer and regulatory demand for sustainable crop protection, and provide a new tool for managing losses in the supply chain.

Technical specifications

Key features and findings:

• Chromobacterium spp. produce a complex mixture of VOCs with demonstrated fungistatic (growth-inhibiting) activity against multiple fungal pathogens
• Activity confirmed against cranberry post-harvest rot fungal complex (Phoma, Colletotrichum, Coleophoma)
• Broad-spectrum inhibition observed against human dermatophytes, Trichoderma, and Phytophthora cinnamomi
• VOC profiles characterized using advanced analytical methods including GC×GC-TOFMS (two-dimensional gas chromatography coupled with time-of-flight mass spectrometry)
• Bacterial isolates originally sourced from bog soils, with several other bacterial genera also showing antifungal VOC activity

Planned validation work:

• Assay individual candidate VOCs for fungistatic activity to identify the most effective compounds
• Screen additional antifungal bacteria using GC×GC-TOFMS to identify overlapping VOC patterns and narrow down candidate compounds
• Test antifungal VOCs for plant tissue toxicity to confirm safety for agricultural use

Technology readiness level

This technology is currently at an early-to-mid stage of development. The proof-of-concept has been established through published peer-reviewed research demonstrating fungistatic VOC activity from C. vaccinii against fungal pathogens. However, key gaps remain: individual active compounds have not yet been fully identified and assayed, and the technology has not yet been tested against post-harvest fungal complexes from fruits and vegetables beyond cranberry. Further validation, including compound identification, efficacy testing on additional crops, and plant safety assessment, is needed before commercial development can begin. The research team is actively seeking partnerships to advance this work toward practical application.