**5. Conclusions**

Heavy metal contamination is an important aspect of environmental pollution, and phytoextraction is one of the most effective technologies in removing many metal species, including radionuclides.

In these contamination cases, the selection of remediation technology should be directed towards the application of phytoremediation if it is to be sustainable.

The interaction between plants and microorganisms creates a fascinating ecosystem that can lead to encouraging results. As highlighted in this study, the microbial inoculation of endophytic bacteria isolated from the roots of spontaneous plants grown on the Pbcontaminated soil allowed a significant percentage of metal phytoextraction to be obtained without chemical mobilizers.

Case studies showing positive results of assisted phytoextraction only with the support of PGPRs are limited, and research in this field must undoubtedly be supported and encouraged.

**Author Contributions:** Conceptualization, M.G., E.F. and G.P.; methodology, M.G., F.P., M.B., E.F. and G.P.; validation, M.G., F.P., M.B., I.P., E.F. and G.P.; formal analysis, M.G., F.P., M.B. and I.P.; investigation, E.F., M.G., F.P., M.B., I.P. and G.P.; resources, I.P., M.G., F.P., M.B. and A.C.; data curation, E.F., I.P. and M.V.; writing—original draft preparation, E.F., G.P., M.G. and M.V.; writing—review and editing, M.V., G.P., I.P. and E.F.; visualization, M.V.; supervision, M.V.; project administration, G.P.; funding acquisition, E.F. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was supported by Eni S.p.A, Research & Technological Innovation Department, San Donato Milanese (Italy) and fully funded by Syndial S.p.A. (now Eni Rewind S.p.A.), agreemen<sup>t</sup> number 3500038857.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Data is contained within the present article.

**Acknowledgments:** The Authors thank Irene Rosellini, IRET-CNR, for technical assistance in Phytoremediation experiments.

**Conflicts of Interest:** The authors declare no conflict of interest.
