Roderic G. C. Diabankana, Shamil Validov, Daniel M. Afordoanyi


The use of microorganisms to increase productivity and maintain soil fertility is an alternative sustainable agricultural practice to replace agrochemicals. The purpose of this study was to isolate microorganisms with high-antifungal, -antibacterial and -plant growth promoting activity from the rhizosphere of the weed Senna occidentalis native to West Africa. Out of 14 isolates, 5 inhibited the growth of Fusarium oxysporum f. sp. radicis lycopersici (Forl) ZUM2407 and one inhibited the growth of Curtobacterium flaccumfaciens. Based on the 16S rRNA gene sequence analysis, the isolates were identified as Streptomyces hydrogenans KS13AU, Bacillus megaterium KSO8AU, B. subtilis KS07AU, B. subtilis KS11AU, and B. velezensis KS04AU. The plant growth-promoting ability of the isolated bacteria as a single-strain and consortium inoculant was tested on spring wheat (Triticum aestivum). The isolate inoculants were applied on seeds as vegetative cells. The results showed that both forms of inoculation had a positive effect on spring wheat growth. However, the greatest effect on the spring wheat plant was observed when isolates were inoculated as a consortium. The biometric parameters of the plant, such as dry biomass, shoot length, and root length, increased significantly up to 30% compared to single strain inoculations.


antagonistic activity, Curtobacterium flaccumfaciens, Bacillus velezensis, Streptomyces hydrogenans.

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