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The mining activity has generated a large amount of waste called tailings; unfortunately, these contain EPT that affect environmental and human health. Phytoremediation assisted with PGPB is one of the strategies used to mitigate its toxic effects. We evaluated the effect of the PGPB tolerant to heavy metals on the Acacia farnesiana rhizosphere in substrates with different concentrations of tailings. For this, 28 bacterial strains of the A. farnesiana rhizosphere were identified and the MIC to heavy metals and metalloids was determined. In the same way, the plant promotion mechanisms were detected, and the effect capacity in the weight and length of the A. farnesiana rhizosphere was determined with three consortiums (A, B, and C, all including various combinations of Bacillus sp, Enterobacter sp and P. putida JM1) in different concentrations of tailings and amendments for 98 days. All the strains were tolerant to heavy metals and were able to produce IAA, fix N2, solubilize phosphates, siderophores, and lytic enzymes. Additionally, only the consortiums A and B were statistically significant in the dry weight of the root with 90 and 100% of substrate with tailings; in length, only a statistically significant difference was observed when the seed inoculated with consortium A was planted with 80% of tailing substrate. The data provide information on the plant-microorganism relationship to use mineral-based phytoremediation strategies with PGPB.

Root Promotion of Acacia farnesiana by PGPB in Mine Tailings