Plant growth promoting agents can promote growth and increase productivity of plants by exerting beneficial effects through various mechanisms. Streptomyces have been poorly explored specifically for their potential as plant growth promoting rhizobacteria. In this study, a total of 62 Streptomyces isolates were obtained from rhizospheric soils and identified based on
their morphology, biochemical tests and 16S rRNA gene sequence analysis. The highest number of Streptomyces was isolated from Zea mays rhizosphere soil. Plant growth promoting characteristics were elucidated, 14 strains exhibited all the plant growth promoting attributes of phosphate solubilization, ammonia production, 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity, indole-3- acetic (IAA) production and siderophore production. 12 isolates were able to produce siderophores, ACC deaminase and ammonia. Only 7 isolates were able to produce siderophores and solubilize phosphates at the same time. The result indicated that Streptomyces have potential in agricultural application as biofertilizer and this will be of tremendous value as chemical fertilizers are becoming expensive with adverse effect on the environment.
Mobolaji Felicia Adegboye has completed her MSc at Obafemi Awolowo University, Ile-ife Nigeria. She is a PhD student at North-West University,
South Africa. Her research entails the Phylogenetics of Actinomycetes under the mentorship of Dr Babalola OO. Mobolaji has published couples of
articles in peer review journals.
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