Isolation and Optimization of Phosphorus Solubilizing Bacteria from Maize Rhizosphere in Nasarawa State, Nigeria

Osuyi Gerard Uyi; Olabisi Peter Abioye; Jeremiah Bala; Philip Alkali Tsado; Sudesh Kumar; Syauqi Ahmad

doi:10.62050/ljsir2023.v1n1.233

Authors

Osuyi Gerard Uyi Department of Microbiology, Federal University of Lafia, Nasarawa state, Nigeria Author
Olabisi Peter Abioye Department of Microbiology, Federal University of Technology, Minna, Niger state, Nigeria Author
Jeremiah Bala Department of Microbiology, Federal University of Technology, Minna, Niger state, Nigeria Author
Philip Alkali Tsado Department of Soil Science and Land Management, Federal University of Technology, Minna, Niger state, Nigeria Author
Sudesh Kumar School of Biological Sciences, Universiti Sains Malaysia, Malaysia Author
Syauqi Ahmad School of Biological Sciences, Universiti Sains Malaysia, Malaysia Author

DOI:

https://doi.org/10.62050/ljsir2023.v1n1.233

Keywords:

Phosphorus solubilizing bacteria, inorganic phosphate, phosphorus, solubilization, orthophosphate, optimization, rhizobacteria

Abstract

Phosphorus solubilizing bacteria (PSB) are a type of plant growth-promoting rhizobacteria which has the ability to convert insoluble phosphate into plant available forms. They are used as biofertilizers to restore soil health and fertility. In the present investigation, isolation, characterization and optimization of phosphate solubilizing activity of these microbes at different pH, temperature and carbon source was carried out. Eight phosphorus solubilizing rhizospheric bacteria (PSRB) isolates isolates were recovered from different farms in six local government from maize rhizosphere using the spread plate method on Pikovskaya agar. Amongst these eight isolates, five were recovered from Lafia local government while three were recovered from Kokona local government with the development of a prominent halozone. All isolates were morphologically characterised, amplified, and sequenced for taxonomic identification using 16S primers. The results indicated they belong to member of the genus Acinetobacter, Ochrobactrum, Brucella, Curtobacterium, Leifsonia and Microbacterium respectively. These strains when grown at different conditions of external carbon sources, temperature and pH showed highest phosphorus solubilizations of 326.23 µg/ml ± 0.21 at 30 °C, 325.50µg/ml ± 1.13 at a pH of 7 and 320.30µg/ml ± 0.36 with glucose as carbon source. The results from these findings could indicate the use of these isolate as trial biofertilizers on the field which will help improve crop yield and enhance plant growth promotion

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