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Yeast-Fusarium interactions and mycotoxin modulation in the phyllosphere
Linda Gouka1, Emma Groen1, Ewa Makowicz2
1Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.
The ISME Journal
|July 16, 2026
Summary
Phyllosphere yeasts like Aureobasidium and Metschnikowia colonize wheat, reducing Fusarium head blight (FHB). These yeasts degrade deoxynivalenol (DON) and plant compounds, revealing chemical interactions in the phyllosphere microbiome.
Area of Science:
- Microbiology
- Plant Pathology
- Chemical Ecology
Background:
- Yeasts are key phyllosphere inhabitants, yet their interactions with other microbes are poorly understood.
- Wheat flag leaves host diverse yeasts with traits for phyllosphere survival.
- Fusarium graminearum causes Fusarium head blight (FHB) in wheat.
Purpose of the Study:
- Investigate interactions between phyllosphere yeasts (Aureobasidium, Metschnikowia) and Fusarium graminearum.
- Determine the role of these yeasts in managing FHB.
- Elucidate the chemical basis of yeast-fungus-plant interactions.
Main Methods:
- Experimental colonization of wheat leaves and heads with yeasts.
- Assessment of FHB incidence.
- Metabolomic analysis of yeast-fungus-plant interactions.
- Degradation assays for deoxynivalenol (DON) and plant compounds.
Main Results:
- Phyllosphere yeasts effectively colonized wheat, significantly reducing FHB when applied before pathogen.
- Aureobasidium and Metschnikowia degraded deoxynivalenol (DON).
- Yeasts degraded plant compounds that induce DON production by Fusarium.
- Demonstrated chemical basis for yeast-mediated FHB suppression.
Conclusions:
- Phyllosphere yeasts possess mechanisms to antagonize Fusarium graminearum.
- Yeast degradation of DON and plant-derived compounds contributes to FHB management.
- Highlights the ecological and chemical interactions within the wheat phyllosphere microbiome.
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