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Gao T, Liu Y, Yang D, Liu X, Zuo M, He Y, Wang H, Bao J, Shen Y, Tai X, Xu J, Xu D. Inoculation of Exogenous Complex Bacteria to Enhance Resistance in Alfalfa and Combined Remediation of Heavy Metal-Contaminated Soil. Curr Microbiol 2023; 80:213. [PMID: 37191724 DOI: 10.1007/s00284-023-03299-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 04/10/2023] [Indexed: 05/17/2023]
Abstract
Heavy metals are considered to be one of the main sources of soil contamination. In this study, three tolerant bacteria were isolated from the heavy metal-contaminated soil in mining area, and immobilized bacteria were constructed using corn straw as the carrier. The combined remediation effect of immobilized bacteria and alfalfa in pot experiments was explored in heavy metal-contaminated soil. Under heavy metal stress, inoculation with immobilized bacteria significantly promoted the growth of alfalfa, in which the dry weights of roots, stems, and leaves increased by 19.8, 6.89, and 14.6%, respectively (P < 0.05). Also, inoculation with immobilized bacteria improved the antioxidant capacity of plants and the activity of soil enzymes and improved soil quality (P < 0.05). Microbial-phytoremediation technology effectively reduced the heavy metal content in the soil, and can restore the soil contaminated by heavy metals. The results will help to further understand the mechanism of microbial inoculation to reduce the toxicity of heavy metals, and provide guidance for the cultivation of forage grasses in heavy metal-contaminated soils.
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Affiliation(s)
- Tianpeng Gao
- School of Biology and Environmental Engineering, Xi'an University, Xi an, 710000, China.
- Engineering Center for Pollution Control and Ecological Restoration in Mining of Gansu Province, Lanzhou City University, Lanzhou, 730070, China.
| | - Yuan Liu
- School of Biology and Environmental Engineering, Xi'an University, Xi an, 710000, China
| | - Deng Yang
- School of Biology and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China
| | - Xiaoxiao Liu
- School of Biology and Environmental Engineering, Xi'an University, Xi an, 710000, China
| | - Mingbo Zuo
- School of Biology and Environmental Engineering, Xi'an University, Xi an, 710000, China
| | - Yueqing He
- School of Biology and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China
| | - Haoming Wang
- School of Biology and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China
| | - Jingting Bao
- School of Biology and Environmental Engineering, Xi'an University, Xi an, 710000, China
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
| | - Yuanyuan Shen
- School of Biology and Environmental Engineering, Xi'an University, Xi an, 710000, China
| | - Xisheng Tai
- Engineering Center for Pollution Control and Ecological Restoration in Mining of Gansu Province, Lanzhou City University, Lanzhou, 730070, China
| | - Jing Xu
- School of Biology and Environmental Engineering, Xi'an University, Xi an, 710000, China
| | - Danghui Xu
- State Key Laboratory of Grassland Agro-Ecosystems, College of Ecology, Lanzhou University, Lanzhou, 730000, China
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