Cadmium is a heavy metal which induces oxidative stress in plants. This ion is extremely toxic to plants and animals. This study investigates the effects of Cadmium different levels in soil and the species of co-existing microorganism on the morphological features of canola (Hyola 401 cultivar). The experiment was conducted at Research Farm Greenhouse of Islamic Azad University, Saveh Branch in 2010, as factorial experiment based on completely randomized blocks design with three replication. The studied factors were: Cadmium nitrate (0, 0.1, 1 and 3 mg/kg) and PGPR (without inoculation and inoculation by Pseudomonas fluorescence, strains 11, 4, 169, 11+4, 11+169, 4+169, 11+169+4).The study showed that cadmium exposure led to reduction in fresh and dry weight of root and shoot and stem height, a significant decrease in the number leaves and pods of canola. These effects were intensified by increasing cadmium concentration in soil. Some Plant growth-promoting rhizobacteria strains enhanced plant growth as compared with non-inoculated plants (control). In addition, strains 4, 11 exhibited a higher capacity in coexistence with plant. On the other hand, the results showed that in the presence of different value of cadmium soil, strains 4 and 11 significantly increased plant growth and the cadmium extraction efficiency from soil.
