Isolation of Pseudomonas fluorescens Species from faba Bean Rhizospheric Soil and Assessment of Indole Acetic Acid Production: In Vitro Study, Ethiopia

Abstract

The microbial inoculants that are used in agriculture include phytohormone synthesis which have role to increase crop growth and yield products. Some microbes have a potential to synthesize plant hormone through utilize the root exudates of plant in rhizospheric area. The objective of this study was to isolate some Pseudomonas fluorescens species from rhizospheric soil of faba bean and tested their indole acetic acid production. Isolation of Pseudomonas fluorescens isolates were carried out on King’s B medium. All isolates Pseudomonas fluorescens were tseted for indole acetic acid production have a potential to produce phytohormone. The test Pseudomonas fluorescens isolates culture were inoculated in the nutrient broth with L-tryptophan 500 mg/l at 28 ± 2°C for one week. The results indicated that all most of the isolates tested possess plant growth promoting traits (phytohormone). So it could be concluded that all isolate Pseudomonas fluorescens can be used as plant growth promoting bacteria for synthesis of plant hormone resulting to increase of the plant growth and yield.