Cinnamon Bark Essential Oil as a Natural Plant Protection Agent: Chemical Profile, Antimicrobial Activity, and...

Area of Science:

• Agricultural Science
• Plant Pathology
• Natural Product Chemistry

Background:

• Ceylon cinnamon bark essential oil (CBO) contains bioactive compounds.
• Natural compounds are increasingly explored for sustainable plant protection.
• Phytopathogenic bacteria and fungi cause significant crop losses globally.

Purpose of the Study:

• To evaluate the antibacterial and antifungal activity of CBO against phytopathogens.
• To determine the chemical composition of CBO.
• To investigate CBO's effects on bacterial metabolism and plant defense responses.

Main Methods:

• Chemical analysis of CBO.
• In vitro antimicrobial assays against a panel of phytopathogenic bacteria and fungi.
• Bacterial metabolic activity assays.
• In planta experiments measuring PAL activity in wheat.

Main Results:

• CBO composition was dominated by cinnamaldehyde, linalool, and eucalyptol.
• CBO demonstrated broad-spectrum activity against key bacterial (e.g., Dickeya dadantii, Pseudomonas syringae) and fungal (e.g., Fusarium graminearum, Phytophthora cinnamomi) pathogens.
• CBO significantly reduced bacterial metabolic activity and induced PAL activity in wheat leaves without phytotoxicity.

Conclusions:

• CBO possesses significant antimicrobial properties against major plant pathogens.
• CBO acts through direct antimicrobial effects and by eliciting plant defense responses.
• CBO shows potential as a sustainable and effective agent for biological plant protection.