La composition chimique et l’activité antibactérienne des huiles essentielles de six plantes aromatiques et médicinales marocaines contre Allorhizobium vitis

This study aims to investigate the chemical composition and inhibitory effects of four essential oils from Moroccan medicinal and aromatic plants: Rosmarinus officinalis L., Satureja calamintha L., Lavandula stoechas L. and Citrus aurantium L. on Allorhizobium vitis strain S4 causal agent of crown gall of grapevine. The identification of compounds was performed by GC-MS analysis. Furthermore, the antibacterial activity of each essential oil was evaluated using aromatogram test. Results showed that the major compounds are cineole (48.12%) and α-Pinene (13.48%) for R. officinalis, borneol (29.01%) and 1,8-Cineole (18.18%) for S. calamintha, linalool (25.76%) and camphor (21.09%) for L. stoechas, linalool (38.81 %) and limonene (37.93 %) for C. aurantium essential oil. All essential oils tested exhibit an antibacterial activity in vitro against A. vitis S4 with a percentage of inhibition and minimal inhibitory concentration values in the range of 7.5-25.88% and 0.15-20.00 mg/ml, respectively.