Why It Matters
Sclerotinia sclerotiorum is a devastating fungal pathogen affecting oilseed crops, particularly sunflowers. Its resilience stems from melanin-coated sclerotia, which protect the fungus from environmental stress and microbial degradation. These structures persist in soil for years, increasing disease risk and reducing field profitability. This project explores a novel polymer-based intervention using pyrones and pyranones, some patented at the University of the Free State, to disrupt melanin synthesis and reduce sclerotial formation. By targeting the pathogen’s protective mechanisms, this research aims to offer a sustainable and effective biocontrol strategy for sunflower producers.
Research Approach
The project evaluates the antifungal efficacy of pyrones and pyranones through a multi-phase approach. Initial in vitro screenings assess compound effectiveness in limiting sclerotial formation. Promising candidates are then tested in glasshouse trials to validate in vivo performance. Data from both phases will inform polymer selection for upscaling and field trials. Despite delays due to the withdrawal of a key chemistry team, fungal isolates are being prepared for imaging to study melanin inhibition. Re-establishing chemistry partnerships and retrieving compound data are critical next steps to resume biological testing and fieldwork.
Research Impact to Farmers
Farmers stand to benefit from a targeted, environmentally friendly solution to manage Sclerotinia head rot in sunflowers. By disrupting the pathogen’s life cycle, this approach could reduce disease incidence, improve crop yields, and restore profitability to affected fields. Unlike conventional fungicides, the polymer-based method aims to offer long-term control with minimal ecological impact. Once validated, this technology could be integrated into crop protection programs, providing farmers with a novel tool to combat persistent soil-borne pathogens and enhance the sustainability of oilseed production systems.
Collaborators & Research Leads
Lead Institution:
- University of the Free State
Principal Investigator:
- Dr Lisa Rothmann
Collaborating Institutions:
- Nelson Mandela University