Endophytic Fungus Offers Green Alternative to Chemical Weed Killers: Hypoxylon anthochroum VOCs Show Strong Bioherbicidal Potential

Introduction:
A new study published in the World Journal of Microbiology and Biotechnology unveils a promising step toward eco-friendly weed control. Researchers from the Universidad Nacional Autónoma de México (UNAM) explored the bioherbicidal properties of volatile organic compounds (VOCs) produced by the endophytic fungus Hypoxylon anthochroum. Their findings indicate that these natural fungal compounds could replace chemical herbicides currently dominating global agriculture.

Key Findings:
The research identified seven VOCs—four alcohols (3-methyl-1-butanol, 2-methyl-1-butanol, 2-methyl-1-propanol, and 2-phenylethanol) and three monoterpenes (eucalyptol, ocimene, and terpinolene)—responsible for strong phytotoxic effects. Tested on common weeds such as Amaranthus hypochondriacus and Medicago sativa, these compounds significantly inhibited seed germination, root elongation, and respiration.

Notably, mixtures of VOCs were more potent than individual compounds. The total mixture (Mtotal) and alcohol mixture (Malcohol) demonstrated greater bioherbicidal activity than terpene-based blends. The team also found that the VOCs disrupted mitochondrial respiration and damaged membrane integrity in plant cells—a key insight into their mechanism of action.

Environmental Relevance:
Herbicide overuse has led to widespread resistance and environmental damage. The discovery of VOCs from H. anthochroum provides a sustainable alternative that targets weeds naturally while minimizing ecological impact.

Conclusion:
The study confirms that volatile metabolites from Hypoxylon anthochroum—especially 3-methyl-1-butanol and its combinations—are potent bioherbicidal agents. With further development, these fungal VOCs could pave the way for the next generation of eco-friendly weed management tools.

Reference

Roque-Flores, G., Macías-Rubalcava, M. L., Fuentes-Jaime, J., Bustos-Brito, C., Saavedra-Barrera, R. A., & Esquivel, B. (2025). Bioprospecting and mode of action of volatile organic compounds from morphospecies of the endophytic fungus Hypoxylon anthochroum in the field of bioherbicides. World Journal of Microbiology and Biotechnology, 41(10), 374. https://doi.org/10.1007/s11274-025-04603-4