This work evaluated the competence of two strains of cadmium (Cd)-resistant , namely K5PN1, an indole-3-acetic acid (IAA) producer, and 11-10SHTh, a siderophore producer on promoting Cd phytoextraction by sunn hemp. The results showed that improved root elongation of sunn hemp seedlings under Cd stress conditions. and were colonized on the root surface of sunn hemp at concentrations of 2.3 × 10 and 6.4 × 10 CFU g root fresh weight, respectively. The results of pot-culture experiments showed that increased the root and shoot lengths, and dry biomass of sunn hemp planted in high Cd-contaminated soil. The Cd concentration in the leaves of sunn hemp inoculated with (73.82 ± 2.20 mg kg plant dry wt) was higher than that of plants with inoculation and the uninoculated control. The phytoextraction of Cd by sunn hemp was significantly increased with Cd-resistant inoculation. In conclusion, both strains of Cd-resistant had potential on enhancing Cd phytoextraction efficiency of sunn hemp. Our study suggests the application of Cd-resistant can improve Cd phytoextraction by sunn hemp for restoration of Cd-polluted sites.
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