In order to investigate the effects of plant growth promoting bacteria on the growth characteristic of wheat, an experiment was conducted at the Research Greenhouse, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran, in year 2009. Experimental design was two factors factorial (3×6) arranged in a completely randomized design with using 3 replications. The first factor consist three cultivars of wheat (Chamran, Sayonez and Gaskogen) and the seconds one was biofertilizer types (phosphate suloblizing bacteria, biophosphore, nitroxin, nitragin, mixed and control). Results showed that the effects of biofertilizers were significant about of leaf area, root volume, shoot and root length. Moreover the difference between cultivars about of emergence rate, leaf area, leaf number per plant, leaf dry weight, total dry weight and leaf to root dry weight, was significant. The highest and the lowest of emergence rate was observed at Gascogen (0.8 seed per 12 hour) and chamran (0.56 seed per 12 hour) cultivars, respectively. The interaction effects were significant about all of the characteristics (emergence rate, leaf area, specific leaf area, leaf number per plant, leaf dry weight, root dry weight, total dry weight, leaf to root dry weight, shoot length, root length, root to shoot length, mean leaf length and root volume) unless emergence percentage. Overall, our result indicated that biofertilizers had a useful and effective function on the improvement of growth characteristics of wheat.

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