A groundbreaking study published in BMC Plant Biology (2025) demonstrates the successful bio-integration of rhizobacteria with biogenic silver nanoparticles (AgNPs) to control bacterial canker in plums caused by Pseudomonas syringae pv. syringae. This disease has long plagued plum orchards, severely impacting yield and fruit quality.
Researchers isolated 19 rhizobacterial strains from plum orchards in Pakistan, identifying Pseudomonas fluorescens and Bacillus subtilis as promising biocontrol candidates based on their plant growth-promoting properties, including biofilm formation and siderophore production. Meanwhile, silver nanoparticles were synthesized using Cannabis sativa leaf extract, characterized by X-ray diffraction, FTIR, and SEM analyses confirming nanosized (~20 nm) crystalline, eco-friendly AgNPs.
In vitro experiments showed that 0.6% AgNP concentration achieved the highest antibacterial effect with a 24.32 mm inhibition zone against P. syringae. Glasshouse trials confirmed the efficacy of combining Bacillus isolates (Hj-2 and Hj-5) with 0.6% AgNPs, which resulted in the lowest disease incidence (18.13%). However, mixtures involving both Pseudomonas and Bacillus strains led to reduced performance due to microbial incompatibility.
The study concludes that compatible rhizobacterial consortia paired with green-synthesized silver nanoparticles present a viable, sustainable alternative to chemical pesticides. This innovation not only mitigates bacterial canker but also aligns with eco-friendly agricultural practices aimed at achieving UN Sustainable Development Goals.
Reference
Kanwal, M., Ahmed, R., Hanif, A., Mehmood, U., Alqahtani, M. D., & Iqbal, M. A. (2025). Bio-integration of rhizobacteria and biogenic silver nanoparticles against Pseudomonas syringae pv. syringae causing plum bacterial canker. BMC Plant Biology, 25(1), 1412. https://doi.org/10.1186/s12870-025-07466-x
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