Evaluation of two Pseudomonas strains isolated from a maize rhizosphere as a plant growth promoting rhizobacteria

Plant growth promoting rhizobacteria (PGPR) are free-living soil bacteria (rhizosphere bacteria), rhizoplane bacteria or endophytic bacteria that may promote plant growth and suppress plant diseases. The aim of this study is to evaluate effects of 2 rhizobacteria strains belonging to the genus Pseudomonas isolated from maize rhizosphere on the plant growth promotion. The in vitro tests showed that both of strain could fix nitrogen, solubilize phosphate, produced phytohormones (IAA and GAs), and improved the germination and growth of Arabidopsis thaliana. Under the greenhouse condition, growth parameters of bacteria inoculated maizes (fresh weight of shoot, dry weight of root, chlorophyll content) were also increased significantly than those of uninoculated ones. Our results reported 2 promising bacteria strain candidates and revealed their potential as a biological agent for eco-friendly agricultural practices.