Essential Oils and Hydrolates: Potential Tools for Defense against Bacterial Plant Pathogens

The essential oils (EOs) of and chemotyped (CT) at carvacrol, two CT at thujanol and thymol, and Hydrolates (Hys) of and var. were chosen for studying their bactericidal efficacy against few phytobacterial pathogens. The Minimal Inhibitory Concentration (MIC) and Bactericidal Concentration (MBC) wer...

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Veröffentlicht in:Microorganisms (Basel) 2022-03, Vol.10 (4), p.702
Hauptverfasser: Proto, Maria Rita, Biondi, Enrico, Baldo, David, Levoni, Matilde, Filippini, Gianfranco, Modesto, Monica, Di Vito, Maura, Bugli, Francesca, Ratti, Claudio, Minardi, Paola, Mattarelli, Paola
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Sprache:eng
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Zusammenfassung:The essential oils (EOs) of and chemotyped (CT) at carvacrol, two CT at thujanol and thymol, and Hydrolates (Hys) of and var. were chosen for studying their bactericidal efficacy against few phytobacterial pathogens. The Minimal Inhibitory Concentration (MIC) and Bactericidal Concentration (MBC) were found by microdilution assay. The essential oils of (MBC 0.06% / ), CT thymol (MBC 0.06% / ), and Hy of (MBC 6.25% / ) resulted in being the most effective against ; thus, they were used as starting concentrations for ex vivo assays. Despite the great in vitro effectiveness, the disease incidence and the population dynamic ex vivo assays showed no significant results. On the other hand, EO of and Hy of (at 0.03% and 4.5% / , respectively) showed resistance induction in tomato plants against infections; both treatments resulted in approximately 50% protection. In conclusion, EOs and Hys could be promising tools for agricultural defense, but further studies will be necessary to stabilize the EOs emulsions, while Hys application could be an effective method to prevent bacterial diseases when used as resistance inducer by pre-transplantation treatment at roots.
ISSN:2076-2607
2076-2607
DOI:10.3390/microorganisms10040702