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Wang L, Liang Y, Liu S, Chen F, Ye Y, Chen Y, Wang J, Paterson DJ, Kopittke PM, Wang Y, Li C. Effect of silicon on the distribution and speciation of uranium in sunflower (Helianthus annuus). JOURNAL OF HAZARDOUS MATERIALS 2024; 478:135433. [PMID: 39146584 DOI: 10.1016/j.jhazmat.2024.135433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2024] [Revised: 07/15/2024] [Accepted: 08/03/2024] [Indexed: 08/17/2024]
Abstract
Sunflower (Helianthus annuus) can potentially be used for uranium (U) phytoremediation. However, the factors influencing the absorption of U and its subsequent distribution within plant tissues remain unclear, including the effect of silicon (Si) which is known to increase metal tolerance. Here, using hydroponics, the effect of Si on the distribution and speciation of U in sunflower was examined using synchrotron-based X-ray fluorescence and fluorescence-X-ray absorption near-edge spectroscopy. It was found that ∼88 % of U accumulates within the root regardless of treatments. Without the addition of Si, most of the U appeared to bind to epidermis within the roots, whereas in the leaves, U primarily accumulated in the veins. The addition of Si alleviated U phytotoxicity and decreased U concentration in sunflower by an average of 60 %. In the roots, Si enhanced U distribution in cell walls and impeded its entry into cells, likely due to increased callose deposition. In the leaves, Si induced the sequestration of U in trichomes. However, Si did not alter U speciation and U remained in the hexavalent form. These results provide information on U accumulation and distribution within sunflower, and suggest that Si could enhance plant growth under high U stress.
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Affiliation(s)
- Linlin Wang
- Northwestern Polytechnical University, School of Ecology and Environment, Xi'an 710072, China
| | - Yanru Liang
- Northwestern Polytechnical University, School of Ecology and Environment, Xi'an 710072, China
| | - Song Liu
- Northwest A&F University, College of Agronomy, Yangling 712100, China
| | - Fan Chen
- Northwestern Polytechnical University, School of Ecology and Environment, Xi'an 710072, China
| | - Yin Ye
- Northwestern Polytechnical University, School of Ecology and Environment, Xi'an 710072, China
| | - Yanlong Chen
- Northwestern Polytechnical University, School of Ecology and Environment, Xi'an 710072, China
| | - Jingjing Wang
- Northwestern Polytechnical University, School of Ecology and Environment, Xi'an 710072, China
| | - David J Paterson
- Australian Synchrotron, ANSTO, Clayton, Victoria 3168, Australia
| | - Peter M Kopittke
- The University of Queensland, School of Agriculture and Food Sustainability, St Lucia, Queensland 4072, Australia
| | - Yuheng Wang
- Northwestern Polytechnical University, School of Ecology and Environment, Xi'an 710072, China.
| | - Cui Li
- Northwestern Polytechnical University, School of Ecology and Environment, Xi'an 710072, China.
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Zhu H, Hu L, Wang Y, Mei P, Zhou F, Rozhkova T, Li C. Effects of Streptomyces sp. HU2014 inoculation on wheat growth and rhizosphere microbial diversity under hexavalent chromium stress. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 276:116313. [PMID: 38626602 DOI: 10.1016/j.ecoenv.2024.116313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 04/04/2024] [Accepted: 04/08/2024] [Indexed: 04/18/2024]
Abstract
Wheat (Triticum aestivum L.) is a major foodstuff for over 40% of the world's population. However, hexavalent chromium [Cr(VI)] in contaminated soil significantly affects wheat production and its ecological environment. Streptomyces sp. HU2014 was first used to investigate the effects of Cr (VI) stress on wheat growth. We analyzed the Cr(VI) concentration, physicochemical properties of wheat and soil, total Cr content, and microbial community structures during their interactions. HU2014 reduced the toxicity of Cr(VI) and promoted wheat growth by increasing total nitrogen, nitrate nitrogen, total phosphorus, and Olsen-phosphorus in Cr(VI)-contaminated soil. These four soil variables had strong positive effects on two bacterial taxa, Proteobacteria and Bacteroidota, in the HU2014 treatments. In addition, the level of the dominant Proteobacteria positively correlated with the total Cr content in the soil. Among the fungal communities, which had weaker correlations with soil variables compared with bacterial communities, Ascomycota was the most abundant. Our findings suggest that HU2014 can promote the phytoremediation of Cr(VI)-contaminated soil.
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Affiliation(s)
- Hongxia Zhu
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China; Henan International Joint Laboratory of Plant Genetic Improvement and Soil Remediation, Xinxiang, Henan 453003, China
| | - Linfeng Hu
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China.
| | - Yunlong Wang
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China
| | - Peipei Mei
- School of Life Sciences, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China
| | - Feng Zhou
- Henan International Joint Laboratory of Plant Genetic Improvement and Soil Remediation, Xinxiang, Henan 453003, China
| | - Tetiana Rozhkova
- Department of general and soil microbiology, Institute of Microbiology and Virology named after D.K. Zabolotny National Academy of Sciences of Ukraine, Kyiv 03143, Ukraine
| | - Chengwei Li
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450001, China.
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Liu C, Song Q, Ao L, Zhang N, An H, Lin H, Dong Y. Highly promoted phytoremediation with endophyte inoculation in multi-contaminated soil: plant biochemical and rhizosphere soil ecological functioning behavior. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:89063-89080. [PMID: 35849233 DOI: 10.1007/s11356-022-21689-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 06/22/2022] [Indexed: 06/15/2023]
Abstract
Rhizosphere soil ecological functioning behavior is of critical importance for regulating phytoremediation efficiency during microbial-assisted phytoremediation for multi-heavy metal-polluted soils. In this study, Trifolium repens L. and its endophyte Pseudomonas putida were used to investigate the ecological responses of the microbe-plant-soil system in Cd, Cr, and Pb co-contaminated soil. The results showed that endophyte Pseudomonas putida significantly increased plant biomass by 22.26-22.78% and phytoremediation efficiency by 29.73-64.01%. The increased phytoremediation efficiency may be related to the improvement of photosynthetic pigment content and antioxidant enzyme activities in leaves and the enhancement of rhizosphere soil ecological functioning. With endophyte application, soil nutrient content was significantly increased and heavy metal bioavailability was enhanced that residual fraction was reduced by 3.79-12.87%. Besides, the relative abundance of ecologically beneficial rhizobacteria such as Bacteriovorax and Arthrobacter was increased by 3.04-8.53% and 0.80-1.64%, respectively. Endophyte inoculation also significantly increased all the functional genes involved in cellular processes, genetic information processing, environmental information processing, and metabolism. This study indicated that the application of endophytes has a positive effect on the biochemical responses of Trifolium repens L. and could significantly improve rhizosphere ecological functioning in multi-heavy metal contamination, which provided clear strategies for regulating phytoremediation.
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Affiliation(s)
- Chenjing Liu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
- Beijing Key Laboratory On Resource-Oriented Treatment of Industrial Pollutants, Beijing, 100083, China
| | - Qian Song
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Linhuazhi Ao
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Nan Zhang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Haowen An
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Hai Lin
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
- Beijing Key Laboratory On Resource-Oriented Treatment of Industrial Pollutants, Beijing, 100083, China
| | - Yingbo Dong
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
- Beijing Key Laboratory On Resource-Oriented Treatment of Industrial Pollutants, Beijing, 100083, China.
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Afzal S, Singh NK. Effect of zinc and iron oxide nanoparticles on plant physiology, seed quality and microbial community structure in a rice-soil-microbial ecosystem. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 314:120224. [PMID: 36165830 DOI: 10.1016/j.envpol.2022.120224] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 09/06/2022] [Accepted: 09/16/2022] [Indexed: 06/16/2023]
Abstract
In this study, we assessed the impact of zinc oxide (ZnO) and iron oxide (FeO) (<36 nm) nanoparticles (NPs) as well as their sulphate salt (bulk) counterpart (0, 25, 100 mg/kg) on rice growth and seed quality as well as the microbial community in the rhizosphere environment of rice. During the rice growing season 2021-22, all experiments were conducted in a greenhouse (temperature: day 30 °C; night 20 °C; relative humidity: 70%; light period: 16 h/8 h, day/night) in rice field soil. Results showed that low concentrations of FeO and ZnO NPs (25 mg/kg) promoted rice growth (height (29%, 16%), pigment content (2%, 3%)) and grain quality parameters such as grains per spike (8%, 9%), dry weight of grains (12%, 14%) respectively. As compared to the control group, the Zn (2%) and Fe (5%) accumulations at their respective low concentrations of NP treatments showed stimulation. Interestingly, our results showed that at low concentration of both the NPs the soil microbes had more diversity and richness than those in the bulk treated and control soil group. Although a number of phyla were affected by the presence of NPs, the strongest effects were observed for change in the abundance of the three phyla for Proteobacteria, Actinobacteria, and Planctomycetes. The rhizosphere environment was notably enriched with potential streptomycin producers, carbon and nitrogen fixers, and lignin degraders with regard to functional groups of microorganisms. However, microbial communities mainly responsible for chitin degradation, ammonia oxidation, and nitrite reduction were found to be decreased. The results from this study highlight significant changes in several plant-based endpoints, as well as the rhizosphere soil microorganisms. It further adds information to our understanding of the nanoscale-specific impacts of important micronutrient oxides on both rice and its associated soil microbiome.
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Affiliation(s)
- Shadma Afzal
- Department of Biotechnology, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, U.P., 211004, India
| | - Nand K Singh
- Department of Biotechnology, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, U.P., 211004, India.
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