Enhancing the Phytoremediation of Heavy Metals by Combining Hyperaccumulator and Heavy Metal-Resistant Plant Growth-Promoting Bacteria

• DOI: 10.3389/fpls.2022.912350
• Publication Date: 2022-06-02T11:44:54Z
• Authors: Yong Zhang; Shangjun Zhao; Sijia Liu; Jing Peng; Hanchao Zhang; Qiming Zhao; Luqing Zheng; Yahua Chen; Zhenguo Shen; Xihui Xu; Chen Chen
• Keywords: Solanum nigrum

Heavy metals (HMs) have become a major environmental pollutant threatening ecosystems and human health. Although hyperaccumulators provide viable alternative for the bioremediation of HMs, potential phytoremediation is often limited by small biomass slow growth rate HM toxicity to plants. Here, plant growth-promoting bacteria (PGPB)-assisted was used enhance HM-contaminated soils. A PGPB with HM-tolerant (HMT-PGPB), Bacillus sp. PGP15 isolated from rhizosphere cadmium (Cd) hyperaccumulator, Solanum nigrum. Pot experiments demonstrated that inoculation strain could significantly increase S. More importantly, markedly improved Cd accumulation in nigrum while alleviating Cd-induced stress Specifically, decreased contents H2O2, MDA, O2·- nigrum, activities (per gram fresh weight) SOD, APX, CAT were increased PGP15-inoculated plants compared control sample. These results suggested interactions between overcome limits alone highlighted promising application PGPB-hyperaccumulator collaborative pattern Furthermore, genome sequenced other strains explore mechanisms underlying promotion HMT-PGPB. The showed core genes define fundamental metabolic capabilities might not be necessary promotion. Meanwhile, PGP15-specific genes, including many transposable elements, played crucial role adaptive evolution resistance. Overall, our improve understanding HMT-PGPB facilitate