The role of Pseudomonas fluorescens strains in growth and phosphate concentration of Rapeseed (Brassica napus L.) . Mojtaba Yousefi Rad* and Nazila Heshmatpoure

In order to study the effect of Pseudomonas fluorescens on growth, morphological characteristics and phosphate uptake by rapeseed (Brassica napus L. Hyola 401), an experiment was performed in 2010. The study was carried out as a randomized complete blocks design with three replications. The treatments included plants inoculation by Pseudomonas fluorescence strain 11, strain 4, strain 169, the dual combinations of strains 11+4, 11+169, 4+169, combination of all three strains studied (11+169+4) and treatment without inoculation (control plant). The findings suggested that application of strain 169 increased plants height, number of leaves and pod; however, it was ineffective on dry and wet weight of root and shoot compared to control and other treatments. It also increased phosphate concentration of roots and shoots compared to the control plant. Results showed strain 169 had successful and important function on improving growth of rapeseed (Brassica napus L. Var Hyola 401). On the other hand, these bacteria caused an increase in phosphate uptake.