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The region around the plant root referred to as the rhizosphere, is the zone where various microbial activity occurs. It performs crucial functions such as increasing the uptake of nutrients for plant development and preventing plant against plant pathogens. Keeping in mind the beneficial role performed by rhizospheric microorganisms, rhizobacterial species were isolated from the maize and soybean plant's rhizosphere. The isolated microorganisms were evaluated for their biochemical characteristics, plant growth-promoting potentials, tolerance to different environmental conditions, and their antifungal activity against  Fusarium graminearum,  a fungal pathogen that infects maize. The rhizobacterial isolates with multiple plant growth-promoting potentials were identified as  Bacillus  spp (80.77%),  Rhodocyclaceae  bacterium (3.85%),  Enterococcus  spp (3.85%).  Massilia  spp (3.85% .  and  Pseudomonas  (7.69%) species based on their 16S rRNA molecular characterization. The bacterial isolates possessed antifungal activities against  Fusarium graminearum,  promote maize and soybeans seed under laboratory conditions, and exhibited different levels of tolerance to pH, temperature, salt, and heavy metal. Based on this, the whole genome sequencing of  Bacillus  sp. OA1,  Pseudomonas rhizosphaerea  OA2, and  Pseudomonas  sp. OA3 was performed using Miseq Illumina system to determine the functional genes and secondary metabolites responsible for their plant growth-promoting potential Thus, the result of this research revealed that the selected bacterial isolates possess plant growth-promoting potentials that can make them a potential candidate to be employed as microbial inoculants for protecting plants against phytopathogens, environmental stress and increasing plant growth and productivity.

Characterization of plant growth-promoting rhizobacterial isolates associated with food plants in South Africa