Stress induced phosphate solubilization by Arthrobacter sp. and Bacillus sp. isolated from tomato rhizosphere

The importance of rhizospheric microbial phosphate solubilization has now been well documented. However, the performance of these microbes is greatly affected by various environmental stresses such as salt stress, pH stress, temperature stress etc. In this study, two stress tolerant phosphate solubilizing rhizobacteria Arthrobacter sp. and Bacillus sp. have been isolated from tomato rhizosphere and characterized with various morphological and biochemical tests. Phosphate solubilizing bacteria were screened on the basis of their phosphate solubilization and strains with high phosphate solubilizing ability were then tested against wide range of temperature, pH, and salt stresses. Their ability to solubilize other insoluble phosphates, such as ferric phosphate (FePO^sub 4^) and aluminum phosphate (AlPO^sub 4^) was also studied. In addition to phosphate solubilizing ability these strains also demonstrated various plant growth promoting and biocontrol activities including indole acetic acid (IAA) production. These two strains have the potential to be used as plant growth promoting rhizobacteria (PGPR). Keywords: Rhizobacteria, phosphate solubilization, environmental stress, plant growth promoting rhizobacteria.

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