Plant growth promoting characterization of soil bacteria isolated from petroleum contaminated soil

Abstract Contaminant-degrading bacteria can be included among the plant-growth promoting bacteria; because the presence of contaminants, in general produce negatively effects on plant’s growth; thus, the elimination of the inhibiting contaminants will benefit them. Although contaminant-degrading strains have been traditionally isolated from various environments; the number of studies that reported the isolation and identification of soil bacteria with contaminant- degrading abilities have increased. The aim of this study was to characterized microbial strains isolated from petroleum contaminated soil by plant growth promotion traits to recommend them as potential bioinoculants. In this work, five of the six soil isolates were classified as Indole Acetic Acid higher producers and only one of them as lower producer. Sporosarcina aquimarina strain -Q3 and Bacillus cereus strain +F2 tested in Axonopus affinis plantlets bioassay, showed that these isolates were the most effective promoters of this plant species; therefore, these soil bacteria with possible hydrocarbon degradation ability could be considered as potential bioinoculants and can be recommended with a practical importance for the rhizoremediation of petroleum contaminated sites and plant growth promotion.

Keywords Soil bacteria, Hydrocarbons, Indole acetic acid, Plant growth promoters.

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