Selection of compost-derived actinomycetes with plant-growth promoting and tomato stem rot biocontrol potentialities

  • Fakher Ayed 1National Agronomic Institute of Tunisia, 1082 Tunis, University of Carthage, Tunisia 2Technical Centre of Organic Agriculture, 4042 Chott-Meriam, Sousse, Tunisia 3UR13AGR09-Integrated Horticultural Production in the Tunisian Centre-East, Regional Research Centre on Horticulture and Organic Agriculture, University of Sousse, 4042, Chott-Meriem, Tunisia
  • Rania Aydi-Ben Abdallah UR13AGR09-Integrated Horticultural Production in the Tunisian Centre-East, Regional Research Centre on Horticulture and Organic Agriculture, University of Sousse, 4042, Chott-Meriem, Tunisia
  • Hayfa Jabnoun-Khiareddine UR13AGR09-Integrated Horticultural Production in the Tunisian Centre-East, Regional Research Centre on Horticulture and Organic Agriculture, University of Sousse, 4042, Chott-Meriem, Tunisia
  • Mejda Daami-Remadi UR13AGR09-Integrated Horticultural Production in the Tunisian Centre-East, Regional Research Centre on Horticulture and Organic Agriculture, University of Sousse, 4042, Chott-Meriem, Tunisia
Keywords: actinobacteria, antifungal activity, growth enhancement, Sclerotium rolfsii, Solanum lycopersicum


Seventeen actinomycetes isolates, recovered from 2 composts, were screened for their ability to promote the growth of tomato seedlings and to suppress stem rot disease caused by Sclerotium rolfsii. Tomato cv. Rio Grande seedlings inoculated with S. rolfsii and treated with A2-3, A3-3, A4-3, A5-3, A8-3, A9-3, A1-4, A2-4, A3-4, A4-4, A6-4, and A10-4 actinobacterial isolates showed 23.3-70% less disease severity than the inoculated and untreated controls. A3-3, A2-4, and A4-4 based treatments applied to S. rolfsii-infected tomato seedlings had significantly enhanced all growth parameters as compared to control. The recorded increments were estimated at 35.52-66.6% for height, 37.4-53.4% for the stem diameter, 38.5-95.6% for the aerial part dry weight, and 81.8-151% for the root dry weight. Treatments with A3-3 and A4-4 isolates had increased the majority of tomato growth parameters by 15.8-56.5% over the pathogen-free control. Tomato seedlings treated with A4-3 and A1-4 isolates showed between 35.2-22.8% and 42.3-43.3% higher aerial part dry weight and root dry weight, respectively, as compared to pathogen-free and untreated control. This investigation demonstrated that the tested composts can be explored as potential sources for the isolation of actinomycetes acting as biocontrol and bio-fertilizing agents.


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How to Cite
Ayed, F., Aydi-Ben Abdallah, R., Jabnoun-Khiareddine, H., & Daami-Remadi, M. (2021). Selection of compost-derived actinomycetes with plant-growth promoting and tomato stem rot biocontrol potentialities. Journal of Phytopathology and Pest Management, 8(1), 79-91. Retrieved from
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