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Profiling the biocontrol agents, nitrogen-fixing bacteria, and indole acetic acid-producing bacteria in anthill soil

Emmanuel E. Imade(1), Ben J. Enagbonma(2), Dorin I. Ediagbonya(3), Emmanuel U. Molokwu(4), Cynthia Nwodo(5), Elo-Oghene Ejuwehwe(6), Chijioke S. Udokwu(7),


(1) University of Benin, P.M.B. 1154, Benin City, Nigeria.
(2) University of Benin, P.M.B. 1154, Benin City, Nigeria.
(3) University of Benin, P.M.B. 1154, Benin City, Nigeria.
(4) University of Benin, P.M.B. 1154, Benin City, Nigeria.
(5) University of Benin, P.M.B. 1154, Benin City, Nigeria.
(6) University of Benin, P.M.B. 1154, Benin City, Nigeria.
(7) University of Benin, P.M.B. 1154, Benin City, Nigeria.
Corresponding Author

Abstract


Due to the adverse ecological impacts of prolonged and excessive use of agrochemicals, many researchers have called for the adoption of eco-friendly materials in farming. Consequently, the aim of this study is to profile the biocontrol agents, nitrogen-fixing, and indole-acetic-acid-producing bacteria present in anthill soil. Anthill soils and adjacent soils were collected, and their physicochemical properties were analysed using standard analytical methods. Viable bacteria were isolated and screened for plant growth-promoting (PGP) activity using standard biochemical, morphological, and bacteriological methods. The PGP capacity of the isolates was evaluated using standard protocol for nitrogen fixation and indole-acetic-acid production, while antagonistic effect against plant pathogens was evaluated using the disk diffusion assay. Results revealed that Pseudomonas aeruginosa, Klebsiella pneumoniae, and Bacillus sp. isolated from the anthill soil demonstrated PGP characteristics including IAA production and nitrogen fixation. Bacillus sp. exhibited zones of clearance with values of 20.00 ± 1.50 mm, 20.00 ± 1.75 mm, 17.00 ± 1.33 mm, and 17.00 ± 1.33 mm against Aspergillus niger, Trichoderma sp., Penicillium sp., and Fusarium sp., respectively. This study demonstrated that anthill soils contain beneficial microbes with the potential to stimulate plant growth and suppress soil-borne plant pathogens

Keywords


Artificial fertilizer, bioengineer, environmental degradation, soil analysis, soil bacteria

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DOI: 10.57046/XKHK1386

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