Transfer factors of some naturally-occurring and artificial radionuclides from an agricultural soil to rhizobacteria-treated Sesbania grandiflora, a small leguminous tree, were studied. Two plant growth promoting rhizobacteria (PGPR) strains (SCR17 and PCE2) were used to carry out an agricultural experiment in pots in semi-arid region (Syria). The results showed the bacterial strain (SCR17) increased the transfer and accumulation of U and K in Sesbania grandiflora, while both bacterial strains showed no effect on the accumulation of Th, Ra, Po and Pb in the treated plants. The transfer factor of Cs from soil to rhizobacteria-treated Sesbania grandiflora was negligible. The values of the transfer factors of Th, Ra, Po and K were found to be within the global values, while the values of the transfer factors of U and Pb were found to be relatively higher. This study highlights the importance of using Phytoremediation by PGPR strains for radionuclides-contaminated soils. Therefore, this method is a promising technique for the restoration and rehabilitation of contaminated sites with radionuclides, as it is low cost, easy to apply, and environmentally friendly.
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