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Endophytic fungi-based wettable powder formulation for Rhizoctonia solani AG-4 biocontrol

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Abstract

Aims

Despite acceptance of beneficial microorganisms as disease management tools, they seldom offered admirable results due to their instability. Here we aimed to develop cost-effective formulations that would enhance the reliability of beneficial microorganism.

Methods

Experiments were conducted to determine biocontrol effect of two endophyte fungi including Aspergillus sp. and Penicillium sp. in biocontrol of Rhizoctonia solani AG-4, develop wettable powder formulations that would fortify and preserve fungi and eventually evaluate their ability to mitigate Rhizoctonia infection on cucumber seedlings using pot experiments.

Results

The results indicated that both endophyte fungi, inhibited mycelial growth of pathogen in dual culture, production of volatile and none-volatile compounds assays. Among five silica-based carrier candidates, bentonite, aluminate and diatomite were chosen in mix with maltodextrin as stabilizer. A new and simple method was used for selecting and dosage optimization of wetting agents including coconut fatty acid, Tween 80 and Triton X100. Also, carboxymethyl cellulose and polyvinyl alcohol as dispersing agents were added to the formulation after dose optimization. Eventually, four wettable powder bioformulations were qualified for greenhouse studies. Plant welfare assessments revealed substantial reduction of Rhizoctonia canker in endophyte-mediated seedlings. Moreover, dry weight and photosynthesis rate were elevated in cucumbers inoculated with beneficial fungi and developed bioformulations.

Conclusions

Greenhouse studies revealed that besides plant protector features, both endophyte fungi have plant growth-promoter attributes as well, which increased when they applied in a formulated form. Noticeable effect detected in case of inoculating biological treatments, suggesting that pathogen presence acted synergistically for endophyte fungi.

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Data availability

The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.

References

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Acknowledgements

The authors acknowledge the funding and supporting of this project by Tarbiat Modares University, Tehran, Iran. We appreciate the assistance from Dr. Ali Mokhtassi-bidgoli, Dr. Siamak Farhadi and Hanifeh Karimi.

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Authors and Affiliations

Authors

Contributions

Sirvan Qaderi performed the experiments, data collection and statistical analysis and prepared the manuscript. Naser Safaie supervised the project and reviewed the manuscript. Both authors contributed in study conception and designing the experiments.

Corresponding author

Correspondence to Sirvan Qaderi.

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Conflict of interests

The authors have no conflict of interests (financial or non-financial) to declare that are relevant to the content of this article.

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Responsible Editor: Birgit Mitter.

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Qaderi, S., Safaie, N. Endophytic fungi-based wettable powder formulation for Rhizoctonia solani AG-4 biocontrol. Plant Soil 488, 485–501 (2023). https://doi.org/10.1007/s11104-023-05987-8

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  • DOI: https://doi.org/10.1007/s11104-023-05987-8

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