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Evaluation of Streptomyces sporoverrucosus B-1662 for biological control of red pepper anthracnose and apple bitter rot diseases in Korea

Summary

This research evaluated a naturally occurring bacterium called Streptomyces sporoverrucosus B-1662 as a biological alternative to chemical fungicides for controlling fungal diseases on red peppers and apples. Laboratory and field tests demonstrated that this bacterium can reduce disease symptoms by over 90%, making it a promising option for organic farmers seeking to protect their crops without synthetic chemicals. The study identified the specific compound responsible for the bacterium’s effectiveness and provided detailed information about its genetic makeup.

Background

Red pepper and apple crops are significantly impacted by anthracnose diseases caused by Colletotrichum species, leading to reduced yield and quality. Streptomyces species have been extensively studied for producing bioactive metabolites with biocontrol potential against phytopathogenic fungi.

Objective

To assess the efficacy of Streptomyces sporoverrucosus B-1662 as a biological control agent against red pepper anthracnose caused by Colletotrichum acutatum and apple bitter rot caused by Colletotrichum siamense, and to characterize the bioactive compounds responsible for its antifungal activity.

Results

Strain B-1662 exhibited significant antagonistic activity against all seven tested fungal pathogens, with over 90% disease control at 10^5-10^7 CFU/mL concentrations. The bioactive compound dibutoxybutane was isolated and characterized. Field trials demonstrated superior efficacy of B-1662 compared to controls in both 2022 and 2023.

Conclusion

Streptomyces sporoverrucosus B-1662 demonstrates promising potential as a biological control agent for managing red pepper anthracnose and apple bitter rot diseases, offering an effective alternative to synthetic fungicides for organic farming systems.
  • Published in:Frontiers in Microbiology,
  • Study Type:Experimental Study,
  • Source: PMID: 39669786, DOI: 10.3389/fmicb.2024.1429646
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