Ugochi Kemka, Etienne C. Chinakwe, Emmanuel Egbadon, Enhancement Potential of Plant Growth-Promoting Rhizobacteria on White Beans (Phaseolus vulgaris) Seedlings, ILNS Volume 57, International Letters of Natural Sciences (Volume 57)
    The effect of inoculating single cultures of plant growth-promoting rhizobacteria (PGPR) on development of white beans seedling (<i>Phaseolus</i><i> vulgaris</i>) was analyzed. Five PGPR were isolated from the rhizosphere of Okra plants and were assessed for abilities to solubilise phosphate and produce indole acetic acid (IAA). The phosphate solubilising index ranged from 6-10 while the concentration of IAA ranged from 17.48mg/l to 27.43mg/l. <i>Serratia</i> sp. produced the highest concentration of IAA (27.43mg/l) and had the highest solubilisation index (10mm). <i>Bacillus</i> sp. produced the least amount of IAA (17.48mg/l) while <i>Staphylococcus</i> sp. had the least solubilisation index (6mm). The highest percentage germination of 83.3% was observed in the seedling inoculated with <i>Bacillus</i> sp. The influence of microbial inoculation on root and shoot elongation was studied hydroponically for 7 days. Significant increases (P&lt; 0.05) in root elongation were observed. The highest seedling root length (18.47cm) and shoot length (19.17cm) were observed with inoculation of <i>Staphylococcus</i> sp. and <i>Bacillus</i> sp. respectively. The use of these bacteria as bio-inoculants could be a sustainable practice to facilitate nutrient supply to white beans seedlings.
    Plant Growth-Promoting Rhizobacteria (PGPR), Single Inoculant, White Bean (<i>Phaseolus vulgaris</i>)