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Enhanced Pepper Resistance to Sclerotium rolfsii Through Root Development and Enzyme Modulation by Hexaconazole and
Yanlong Jia1, Rong Wen2,3, Chuanjing Liang2
1School of Chemistry and Environmental Engineering Hanshan Normal University Chaozhou China.
Plant Direct
|January 13, 2026
Summary
This study shows hexaconazole and azoxystrobin fungicides effectively control Southern blight in pepper plants. These chemicals protect pepper growth and boost antioxidant defenses against the Sclerotium rolfsii fungus.
Area of Science:
- Plant Pathology
- Agricultural Chemistry
- Mycology
Background:
- Southern blight, caused by *Sclerotium rolfsii*, severely impacts pepper (*Capsicum annuum* L.) cultivation.
- Effective chemical control strategies are crucial for managing this soil-borne fungal disease.
Purpose of the Study:
- To investigate pepper physiological responses to *S. rolfsii* infection.
- To evaluate the efficacy of hexaconazole and azoxystrobin fungicides against Southern blight.
Main Methods:
- Application of hexaconazole and azoxystrobin at specific concentrations.
- Assessment of fungicide efficacy in terms of protective and curative activity.
- Evaluation of physiological parameters including plant growth, root development, and antioxidant enzyme activity (POD and CAT).
Main Results:
- Hexaconazole (50 μg·mL⁻¹) showed 97.56% protective activity.
- Azoxystrobin (100 μg·mL⁻¹) demonstrated 88.62% protective and 49.06% curative activity.
- Both fungicides enhanced plant growth, root development, and antioxidant enzyme activity, reducing disease severity.
Conclusions:
- Hexaconazole and azoxystrobin are effective in managing Southern blight in pepper.
- Fungicides mitigate disease by directly suppressing the pathogen and enhancing host plant defense mechanisms.
- Modulation of the antioxidant system (POD and CAT) is a key mechanism by which these fungicides protect pepper plants.
