Abstract
Plants acquire phosphorus from soil solution as phosphate anions, which, however, are extremely reactive and may be immobilized throughprecipitation withcations such as Ca2+, Mg2+, Fe3+ and Al3+, depending on the particular properties of a soil. In the present study, Pseudomonas aeruginosa was isolated from soil samples of fields in and around Aurangabad, and tested for phosphate solubilization, to solubilize insoluble inorganic phosphate such as tricalcium phosphate.The isolates are also tested for their capability to increase plant growth parameters ( related to the IAA production) in germinating seed bioassay and siderophore production under iron-limiting conditions. From the study, Pseudomonas isolates exhibited the plant growth promoting abilities by showing a substantial increase in length of germinated seedlings through IAA production, solubilized inorganic insoluble phosphates in the soil and as well can be used in iron deficient soils. Thus, we can conclude that Pseudomonas aeruginosa. can be used as plant growth promoter by applying as seed treatment prior to germination and also to increase availability of phosphorus and iron in soils.