In conclusion, the results show that the rhizosphere is a large reservoir of bacteria capable of promoting plant growth. PGPR bacteria are capable of development and functioning at even high concentrations of heavy metals and thus, may decrease the plants toxicity of heavy metals. This effectis particularly needful on industrial areas with no vegetation cover, because of high toxicity of ions. This research confirms that PGPR bacteria increase capability of plats to survive and develop the vegetation cover on contaminated areas. The efficiency of specific PGPR may be further enhanced with the optimization and acclimatization according to the prevailing soil conditions. The rootlength-promoting effect ofthe selected bacterial strains is most probably due to their ability to ACC degradation and this effect is observed only for isolates with high ACC deaminase activity. ACC deaminase activity by plant -associated bacteria promotes plant growth by decreasing the unfavorable effect of ethylene synthesis. Five isolates showed growth on N-deficient medium designed for N-fixing bacteria (Table 3). However, diazotrophic capacity was evaluated using a qualitative agar plate method, and future experiments should be carried out to confirm and quantify the capacity of each strain. In the presence of bacterial inoculation the plants growth was higher compared to uninoculated plants. This confirms the properties of isolated bacteria to promote plants growth. This study also indicates the different effects of selected bacteria on the growth of two different plants. Strains contributing positively to the growth of monocot plants do not necessarily have the same effectin dicots plants. There is no universal bacterial inoculation for the mono- and dicots plants. Future research requires study on the effect of combining inoculation of particular lines with each other. Single feature of PGPR might not be expressed in a given conditions. In this study, differences were noted in the effectiveness of using the same inoculation methods for grass and rape. Application of Method 1 and 3 of bacteria inoculation seems to be the most favorable for the PGPR bacteria effectiveness. Method 1 of inoculation, applied during the germination of seeds for 48 h on plates with a bacterial suspension, seems to be the most suitable for fescue grass. Inoculation of plants during germination with PGRP bacteria is an efficient method for protecting seeds from growth inhibition caused by toxic and poor soil properties. Moreover for rape plants, the inoculation with bacteria directly to soil after two weeks of growth stimulates the roots growth most effectively. The bacteria associated with plant rhizosphere naturally occurring in contaminated areas stimulate plant growth due to the biochemical activity and thus improve the soil phytoremediation process. In future are expected that PGPR replace the artificial growth regulators, chemical fertilizers, pesticides which have numerous side-effects.