JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 71 No 1 (2026): Journal of The Chilean Chemical Society - Special Issue in Tribute to Professor Mario Silva (In Memoriam)
Original Research Papers

DETERMINATION IN VITRO OF THE ANTIBACTERIAL ACTIVITY OF CHILEAN NATIVE ESSENTIAL OILS AGAINST PSEUDOMONAS SYRINGAE PV. ACTINIDIAE AND PSEUDOMONAS SYRINGAE PV. SYRINGAE ISOLATES

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  • Felipe Moraga-Nicolás,
  • Emilio Hormazábal,
  • Ana Mutis,
  • Andrés Quiroz,
  • Jazmín Celi,
  • Jaime Guerrero Contreras,
  • Set Pérez Fuentealba
Felipe Moraga-Nicolás
UNIVERSIDAD DE LA FRONTERA
Published August 2, 2026
Keywords
  • Pseudomonas syringae pv. actinidiae, Essential oils, Antibacterial activity
How to Cite
Moraga-Nicolás, F., Hormazábal, E., Mutis, A., Quiroz, A., Celi, J., Guerrero Contreras, J., & Pérez Fuentealba, S. (2026). DETERMINATION IN VITRO OF THE ANTIBACTERIAL ACTIVITY OF CHILEAN NATIVE ESSENTIAL OILS AGAINST PSEUDOMONAS SYRINGAE PV. ACTINIDIAE AND PSEUDOMONAS SYRINGAE PV. SYRINGAE ISOLATES. Journal of the Chilean Chemical Society, 71(1), 6490 - 6494. Retrieved from https://jcchems.com/index.php/JCCHEMS/article/view/3072

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Abstract

Pathogenic bacteria Pseudomonas syringae pv. actinidiae (Psa) and Pseudomonas syringae pv. syringae (Pss) causes bacterial canker disease in kiwifruit orchards. In this regard antibacterial activities of Chilean native species Peumus boldus (Molina), Laurelia sempervirens (Ruiz & Pav. Tul.), Cryptocarya alba (Mol) Looser essential oils, α-pinene, eucalyptol and p-cymene showed efficacy against Psa and Pss strains by disc diffusion method and liquid culture assay. The P. boldus essential oil at 7.0 mg/disc was significantly more effective than L. sempervirens and C. alba essential oil at the same concentration, using streptomycin as positive control. Additionally, α-pinene and p-cymene showed a remarkable effect in the inhibition of all strains tested at the same concentration. On the other hand, p-cymene showed a notable antibacterial activity similar to streptomycin against Psa. The P. boldus essential oils minimal inhibitory concentrations (MIC) and minimal bactericidal (MBC) concentration ranged from 312.5  to 625 ppm against Psa. The efficacy of P. boldus EO was comparable to streptomycin in in vitro conditions, offering potential as a sustainable alternative to integrated control of Psa in the kiwifruit industry.

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