Salvia officinalis L. is one the most popular medicinal and aromatic plant species belonging Lamaiceae family, native to the Mediterranean region, although it has been naturalized in many places throughout the world mainly because of to its high medicinal value[1]. A greenhouse experiment was carried out to determine the antioxidant activty of S. officinalis L. plants inoculated with four rhizobacteria strains namely Pseudomonas fluorescens (Pf Ap1, Pf Ap18) and P. putida (Pp Ap9, Pp Ap14). rhizobacteria suspensions were diluted in sterile distilled water to achieve the final concentration of 108 CFU ml-1. The suspensions were subsequently applied to the soil, cuttings and leaves.Totally, 60 ml of the final suspension was applied for each treatment The control cuttings received the same amount of distilled water. The experiment was arranged based on completely randomized design and replicated at three times. Plants were harvested after four months at the full flowering stage. The essential oils (EOs) were isolated from aerial flowering parts of the plants by hydro-distillation method. The dry matter yield of root and shoot of plants was significantly (p < 0.05) increased with different rhizobacteria inoculation as compared to the uninoculated control plants. However, the effects of inoculation varied depending on the rhizobacteria strains involved. The root dry weight of plants inoculated with each of P. fluorescens (Pf Ap1, Pf Ap18) or P. putida (Pp Ap9, Pp 14) strains was increased by 42.6%, 36.8%, 40.8% and 83.5% over the control, respectively. Also, employed rhizobacteria significantly increased the shoot dry matter yield as 33.2%, 10.2%, 30% and 53.9% over the control, by the treatment of Pf Ap1, Pf Ap18, Pp Ap9 and Pp Ap14, respectively. The maximum yield of whole plant dry matter (8.95 g) was obtained in Pp Ap14-treated plants as compared to the other treatments. Exposure to all employed rhizobacteria strains, increased the EOs yield as compared to uninoculat
