Related Experiment Videos
Triterpene phytoalexins from strawberry fruit
1Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Japan. hirai@kais.kyoto-u.ac.jp
Bioscience, Biotechnology, and Biochemistry
|September 19, 2000
Summary
Strawberry plants produce antifungal compounds called triterpenes when wounded or infected. These phytoalexins, including myrianthic acid, euscaphic acid, and tormentic acid, help defend unripe strawberries against fungal pathogens like Colletotrichum musae.
Area of Science:
- Plant Pathology
- Phytochemistry
- Mycology
Background:
- Strawberry cv. Houkouwase exhibits resistance to Colletotrichum fragariae.
- Antifungal compound production is triggered by wounding and inoculation in unripe strawberry fruit.
Purpose of the Study:
- To identify and characterize antifungal compounds produced by strawberry cv. Houkouwase.
- To investigate the role of these compounds in plant defense against fungal pathogens.
Main Methods:
- Isolation and identification of antifungal compounds using chromatographic and spectroscopic techniques.
- Bioassays to determine the inhibitory effects of isolated compounds on fungal growth.
- Quantitative analysis of compound levels in response to wounding and inoculation.
Main Results:
- Three triterpenes, euscaphic acid, tormentic acid, and myrianthic acid, were isolated and identified.
- Myrianthic acid demonstrated potent inhibition of Colletotrichum musae growth at 3 µg, while euscaphic and tormentic acids were effective at 100 µg.
- Triterpene levels significantly increased in wounded and inoculated unripe fruit, suggesting their role as phytoalexins.
Conclusions:
- Unripe strawberry fruit of cv. Houkouwase produce triterpenes, identified as euscaphic acid, tormentic acid, and myrianthic acid, in response to wounding and fungal inoculation.
- These triterpenes function as phytoalexins, contributing to the resistance of strawberry plants against fungal infections.
- The findings highlight a key mechanism of plant defense in strawberries involving induced production of specific antifungal compounds.