bacteria include not only the genus Rhizobium, which fall within thesymbiotic relationships with leguminous plants, but also includesome Pseudomonas sp. The importance of PGPR increases whenthe soil becomes poor in nitrogen. Then the bacteria can effec-tively promote plant growth by providing the limiting element(Klama et al., 2010). Indirect methods of stimulating plant growthare based on the reduction or complete elimination of the harm-ful effect of phytopathogenic organisms. The pathogen control byPGPR action involves competition with the ecological niche andnutrients, while bacteria produce antibiotics and lysis enzymes andsecondary metabolites to combat pathogens. Effective colonizationof PGPR bacteria affects growth and development of plants. Theincreasing scale of action towards widespread use of strains whichwould include PGPR bacteria in the soil restoration. Such an actionwould allow for increased efficiency in the use of biological reme-diation of contaminated and degraded areas (Klama et al., 2010;Glick, 2005).The aim of the present study was to isolate and character-ize PGPR bacteria associated to grass Agrostis capillaris L., toevaluate its plant growth promotion mechanisms and to corre-late them with the potential effects on the overall physiologyand survival of the plants in unfavourable conditions, in orderto improve the efficiency of phytoremediation of contaminatedsoils.