Effectiveness of Phosphate Solubilizing Bacteria inoculation for Improving Phosphorus Absorption and Root Growth Indices

ABSTRACT: The current investigation was conducted to explore the efficiency of using some phosphate solubilizing bacteria in phosphorus absorption, developing of root volume, and dry weight of potato root of Agria cultivar derived from tissue culture. In this experiment, minitubers of tissue culture were inoculated with two strains of Pseudomonas bacterium (Ps116 and Ps173) from species Pseudomonas fluorescens and two genera of bacillus bacterium (Bacillus subtilis and Bacillus megaterium) all along with control treatment as separately and in mixture with each other within factorial experiment based on completely randomized design and in three replications. The results indicated that inoculation with Pseudomonas had significant impact on rate of phosphorus absorption and vegetative parameters in potato root at probability level 1%. The rate of phosphorus absorption and volume of root as well as dry weight of root showed significant difference with inoculation of several specious of Bacillus at levels 1 % and 5 % respectively. Likewise, it was characterized that the interaction effect of Pseudomonas × bacillus was significant on rate of phosphorus absorption at probability level 5%. With respect to comparison among these traits, it was identified that the inoculation by Pseudomonas (Ps173) with 34.5 % increase in contrast to control treatment and 16.4% compared to Ps116, had the maximum effect on rate of phosphorus absorption. This strain of Pseudomonas had maximum impact on rate of developing root volume. Also, dry weight of root under inoculation wit