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| Synergistic effect of Bacillus thuringiensis P34 and sepiolite on lead uptake of vegetables and remediation in Pb-contaminated soils |
| Received:October 14, 2018 |
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| KeyWord:Bacillus thuringiensis;sepiolite;synergistic amendment;vegetable;lead;field experiment |
| Author Name | Affiliation | E-mail | | HE Zhuo | Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | YIN Tu-tong | Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | GE Zhan-biao | Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | SHENG Xia-fang | Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | HE Lin-yan | Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | helyan0794@njau.edu.cn |
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| Abstract: |
| In this study, a microbe-adsorption immobilization method was used to test the in situ remediation and safe production of vegetables in heavy metal contaminated farmlands. Field experiments were carried out on a lead-contaminated farmland adjacent a mine region in Qixia, Nanjing. The effects of Bacillus thuringiensis P34, sepiolite (S). and P34+S treatment on the growth, Pb accumulation, and nutritional quality of eggplants (SQ-I) and peppers (SJ-V), were assessed. The influence of the treatments on the physical and chemical properties of the plant rhizosphere soil was also analyzed. The Pb content of the eggplant and pepper fruits was significantly reduced by sepiolite, compared to the control. Furthermore, the P34+S treatment significantly reduced the Pb content of pepper and eggplant fruits by 58% and 26%, respectively. The biomass and nutritional quality of pepper fruits increased. Notably, the P34+S treatment significantly increased the pH, the number of spore-forming bacteria, the urease-sucrase activities and the amount of >1 mm aggregates in plant rhizosphere soils. On the other hand, it decreased the DTPA-extracted Pb content and the amount of <0.25 mm aggregates in plant rhizosphere soils. Our results show that the synergistic amendment of P34 and sepiolite can be used efficiently to stabilize and reclaim Pb-contaminated farmlands, inducing a low Pb uptake by vegetables and improving soil quality. |
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