Investigation the role of Plant Growth Promoting Rhizobacteria on concentraition of some elements nutrition under irrigation with saline water in rice (Oryza sativa L.)

salinity is one of the most limitation factors for crop production in agricultural systems due to the toxic effects and preventing water and nutrients absorption, In this research the efficiency of four strains of Fluorescent pseudomonads on concentration of nutrient elements in rice was determined, under saline conditions. A pot experiment was carried out based on the factorial Completely Randomized Design experiment with four replications. Treatments included interaction between five levels of saline irrigation water (700, 1400, 2800, 4200 and 5600µs/cm from sea water source) and four inoculations (P. putida 11, P. putida 4, P.putida 108 and P.fluorescens 169) and control (non- inoculation). Rice was transplanted in pots after they were inoculated with desired strains. During growing period, the pots were irrigated with treatment of salinity in saturation point. In the flowering stage, flag leaf samples were collected to determine nitrogen, phosphorus and potassium concentration. The amounts of nutrients in seed samples were determined after rice harvesting. Results showed that increase in salinity level caused to decrease in nutrient levels in the leaf and seed significantly (p < 0.01). Inoculation with test strains, on the other hand, led to increase in nutrient concentration. Results also indicated that interactions between bacteria and salinity raised nitrogen and phosphorous level in the rice leaf and seed significantly (at p< 0.01). there were no significant difference between strains in N content of leaf at all salinity levels. Therefore, in saline condition, strains of Fluorescent pseudomonas can be used as growth promoting bacteria of rice.