Camelina sativa is an important oilseed due to its potential in the production of biodiesel and bioproduct. To investigate the water deficit– induced effects and PGPB on the growth and seed composition of Camelina “Soheil cultivar”, an experiment was programmed in three levels 100, 75 and 50%FC and the presence of Micrococcus yunnanensis as plant growth- promoting bacteria during the reproductive phase. The results showed under water deficient silique and seed number and silique length decrease coincided with the increase of seed weight. Also the decrease of oil content associated with the increased protein and total carbohydrate content. Carbon to nitrogen ratio and oil content were in a line and the nitrogen to sulphur ratio positively correlated to protein content. In seeds, the increase of Mn and P associated with the decrease of Fe and Zn. The highest proportion of fatty acid was related to poly unsaturated fatty acid in particular linolenic acid. The increase of poly unsaturated fatty acid and saturated fatty acid coincided with the decrease of mono unsaturated fatty acid under water deficit stress. The antioxidant capacity and total phenol content had an increasing trend with limited water. PGPB application resulted in the increase of seed weight, seed and silique number, nutrients uptake and the increase of protein. Also, PGPB increased antioxidant capacity and total phenol. PGPB decreased oil content but it had various effects on fatty acid profiles. In general, PGPB had significant effect on remobilization nutrients from soil to developing seed and following metabolites synthes