New Study Finds Pseudomonas yamanorum as a Sustainable Biocontrol Solution for Tomato Early Blight
Tomato production worldwide suffers significant losses due to early blight caused by Alternaria alternata. Conventional control using synthetic fungicides often leads to environmental contamination and pathogen resistance. A new study published in Plants (2025) highlights a promising eco-friendly alternative—Pseudomonas yamanorum, a beneficial rhizobacterium capable of suppressing fungal pathogens and promoting plant growth.
Researchers from Tunisia and Russia demonstrated that P. yamanorum isolated from tomato rhizospheres inhibited fungal growth by nearly 70% in laboratory tests. When applied to tomato plants in greenhouse conditions, it dramatically reduced disease severity and improved growth parameters. Plants treated with P. yamanorum exhibited 45 cm shoots compared to 26 cm in infected controls and showed enhanced antioxidant enzyme activities such as catalase and peroxidase.
The bacterium not only strengthened plant defenses but also preserved fruit quality—improving firmness, sugar content, and juice yield while reducing oxidative stress indicators. When combined with salicylic acid, P. yamanorum offered additional resilience under biotic stress.
This research underscores the potential of P. yamanorum as a dual-function biocontrol and biofertilizer agent for sustainable tomato production. Its local adaptability and compatibility with organic systems make it a promising candidate for reducing chemical pesticide use and improving crop quality in Mediterranean and similar climates.
Reference
Hajji-Hedfi, L., Wannassi, T., Khlif, A., Kavhiza, N. J., & Rebouh, N. Y. (2025). Investigating the Biocontrol and Plant Growth-Promoting Potential of Pseudomonas yamanorum for Sustainable Management of Tomato Early Blight (Alternaria alternata). Plants, 14(20), 3117. https://doi.org/10.3390/plants14203117
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