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Journal of Applied Sciences
Year: 2020  |  Volume: 20  |  Issue: 6  |  Page No.: 196 - 207

Characterization of Plant Growth Promoting Rhizobacteria Isolated from an Arid Area Soil of Date Palm in Saudi Arabia

Yassine Elmaati, Fouad Msanda, Abdelazize Eljiati, Hammou Ouchaou, Hassan Boubaker and Mohamed Ait Hamza    

Abstract: Background and Objective: Many soil rhizospheric bacteria can transform insoluble forms of phosphorus and potassium to an accessible soluble form, contributing to plant nutrition as Plant Growth-Promoting Rhizobacteria (PGPR). The main purpose of this study was to isolate and identify the native population of phosphate and potassium solubilizing bacteria in the rhizospheres of date palm (Phoenix dactylifera L.) grown in the Al-Qassim region, Saudi Arabia. Materials and Methods: The rhizobacterial strains were isolated and in vitro screened for their phosphate and potassium solubilizing potential and ammonia production by using routine plate assay methods. The selected strains were identified based on nucleotide sequence data from the 16S ribosomal rRNA encoding gene. Results: The strains PSA1 and AZA2 have exhibited the highest qualitative efficiency of phosphate solubilization, while the strains AZA2 and PSA2 showed the most pronounced ability to solubilize potassium. The strains S1-3, I2 and AZS2 were the most effective for the production of ammonia. Based on the rRNA sequencing, these strains were identified as Enterobacter ludwigii (PSA1, PSA2 and AZA2), Bacillus subtilis (AZS2), Bacillus cereus (I2) and Klebsiella oxytoca (S1-3). Conclusion: These results suggest that some indigenous rhizobacterial strains could be an efficient and eco-friendly alternative to chemical fertilizers in the process of bio-fertilization of date palm.

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