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Volatile Compounds from Vishniacozyma victoriae Induce Glandular Trichome Development in Humulus lupulus
Takeshi Hirakawa1, Yuki Katayama1, Nariaki Wasano1
1Kirin Central Research Institute, Kirin Holdings Company, Ltd., 26-1, Muraoka-Higashi 2, Fujisawa, Kanagawa 251-8555, Japan.
Journal of Agricultural and Food Chemistry
|May 17, 2026
Summary
Volatile compounds from the yeast Vishniacozyma victoriae (V. victoriae) trigger glandular trichome (GT) formation in plants. The compound 2-nonanone is identified as the key inducer, suggesting agricultural applications for enhancing GT density.
Area of Science:
- Plant biology
- Microbial-plant interactions
- Agricultural science
Background:
- Glandular trichomes (GTs) in *H. lupulus* (hops) produce specialized metabolites crucial for beer brewing.
- The mechanisms regulating GT formation in plants are not fully understood.
- Phyllosphere yeast *Vishniacozyma victoriae* (*V. victoriae*) produces volatile compounds.
Purpose of the Study:
- To investigate the role of *V. victoriae* volatile compounds in inducing GT formation.
- To identify the specific bioactive compound responsible for GT induction.
- To elucidate the molecular pathways involved in volatile-induced trichome development.
Main Methods:
- Treatment of plants with volatile compounds from *V. victoriae*.
- Identification of bioactive volatile compounds using chemical analysis.
- Gene expression analysis to study molecular pathways.
- Exogenous application of identified compounds to assess effects on GT density.
Main Results:
- Volatile compounds from *V. victoriae* significantly induced GT formation.
- 2-nonanone, a methyl ketone, was identified as the primary bioactive compound.
- Treatment activated iron uptake-related gene expression, implicating iron pathways in trichome development.
- Exogenous 2-nonanone increased GT density in various medicinal plants.
Conclusions:
- Volatile compounds produced by *V. victoriae*, particularly 2-nonanone, are potent inducers of GT formation.
- Iron uptake pathways are involved in the response to volatile-induced trichome development.
- *V. victoriae* volatiles represent a promising biological tool for agricultural applications to enhance GT density in plants.
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