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Zhang M, Liu Z, Han F, Cong H, Zhou W. Co-application of phytoremediation with iron-loaded biochar in petroleum and zinc co-contaminated soil. ENVIRONMENTAL RESEARCH 2024; 263:120037. [PMID: 39307227 DOI: 10.1016/j.envres.2024.120037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2024] [Revised: 09/13/2024] [Accepted: 09/18/2024] [Indexed: 09/27/2024]
Abstract
Phytoremediation, a proven technique widely used in soil remediation, encounters challenges in addressing the synergistic effect of petroleum and heavy metals in co-contaminated soils. Enhancing phytoremediation with modified biochar could improve its effectiveness, but the remediation mechanism of pollutants and the structure of microbial communities in soil aggregates have rarely been studied. Ferrate-modified biochar (FeBC) was used in this study to promote the phytoremediation of petroleum and zinc co-contaminated soils. Results showed that ferrate significantly enhanced the microstructure, elemental composition, and surface crystal composition of pristine biochar. The co-remediation by FeBC and ryegrass significantly improved the removal of petroleum hydrocarbons in soil, especially in meso-aggregates. Simultaneously, the bioavailability of zinc in the soil was reduced by FeBC, contributing to the less accumulation of zinc in ryegrass. The interactions among FeBC, soil aggregates and ryegrass indicated that FeBC enhanced the plant resistance by the formation of iron membranes on the surface of ryegrass roots, and enriched dissolved organic matters in meso- and micro-aggregates. The addition of FeBC resulted in the increase of urease and alkaline phosphatase activities in the rhizosphere soil of ryegrass. Furthermore, the application of FeBC led to a notable increase in the content of phospholipid fatty acids in the ryegrass rhizosphere soil, particularly in bacterial populations within the soil meso- and micro-aggregates fractions. The bacterial communities with more cooperative relationship and greater stability were reshaped in different soil aggregate structures by the FeBC addition. This study delves into the potential mechanism of co-remediation by exploring the interactions among ferrate-modified biochar, rhizosphere microbial community and soil aggregates, providing innovative insights into the phytoremediation of soil contaminated by petroleum and zinc.
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Affiliation(s)
- Mengru Zhang
- School of Civil Engineering, Shandong University, Jinan, 250061, PR China
| | - Zhe Liu
- School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China
| | - Fei Han
- School of Civil Engineering, Shandong University, Jinan, 250061, PR China
| | - Haitao Cong
- Shandong Land Development Group Co.,Ltd, Jinan, 250014, PR China
| | - Weizhi Zhou
- School of Civil Engineering, Shandong University, Jinan, 250061, PR China.
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Li D, He Z, Chen S, Chen J, Ding Z, Luo J, Li Z, Hu Y. Alleviation of cadmium uptake in rice (Oryza sativa L.) by iron plaque on the root surface generated by Providencia manganoxydans via Fe(II) oxidation. Arch Microbiol 2024; 206:387. [PMID: 39196357 DOI: 10.1007/s00203-024-04110-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2024] [Revised: 08/05/2024] [Accepted: 08/13/2024] [Indexed: 08/29/2024]
Abstract
Iron plaque is believed to be effective in reducing the accumulation of heavy metals in rice. In this work, a known soil-derived Mn(II)-oxidizing bacterium, LLDRA6, which represents the type strain of Providencia manganoxydans, was employed to investigate the feasibility of decreasing cadmium (Cd) accumulation in rice by promoting the formation of iron plaque on the root surface. Firstly, the Fe(II) oxidation ability of LLDRA6 was evaluated using various techniques including Fourier Transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, phenanthroline photometry, and FeS gel-stabilized gradient assays. Subsequently, the formation of iron plaque on the root surface by LLDRA6 was investigated under hydroponic and pot conditions. Finally, Cd concentrations were examined in rice with and without iron plaque through pot and paddy-field tests. The results showed that LLDRA6 played an efficient role in the formation of iron plaque on seedling roots under hydroponic conditions, generating 44.87 and 36.72 g kg- 1 of iron plaque on the roots of Huazhan and TP309, respectively. In pot experiments, LLDRA6 produced iron plaque exclusively in the presence of Fe(II). Otherwise, it solely generated biofilm on the root surface. Together with Fe(II), LLDRA6 effectively reduced the concentrations of Cd in Huazhan roots, straws and grains by 25%, 46% and 44%, respectively. This combination also demonstrated a significant decrease in the Cd concentrations of TP309 roots, straws and grains by 20%, 52% and 44%, respectively. The data from the Cd translocation factor indicate that obstruction of Cd translocation by iron plaque predominantly occurred during the root-to-straw stage. In paddy-field tests, the Cd concentrations of grains harvested from the combination treatment of LLDRA6 and Fe(II) exhibited a decline ranging from 40 to 53%, which fell below the maximum acceptable value for Cd in rice grains (0.2 mg kg- 1) as per the China national standard for food security (GB2762-2017). Meanwhile, the relevant phenotypic traits regarding the yield were not adversely affected. These findings have demonstrated that LLDRA6 can impede the uptake of Cd by rice in Cd-contaminated soils through the formation of iron plaque on roots, thus providing a promising safe Cd-barrier for rice production.
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Affiliation(s)
- Ding Li
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China.
- Zhuzhou City Joint Laboratory of Environmental Microbiology and Plant Resources Utilization, Hunan University of Technology, Zhuzhou, 412007, China.
| | - Zeping He
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China
| | - Sha Chen
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China
- Zhuzhou City Joint Laboratory of Environmental Microbiology and Plant Resources Utilization, Hunan University of Technology, Zhuzhou, 412007, China
| | - Jinyuan Chen
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China
| | - Zhexu Ding
- Jiangsu Provincial Key Laboratory for Organic Solid Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jun Luo
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China
| | - Zongpei Li
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou, 412007, China
| | - Yuanyi Hu
- State Key Laboratory of Hybrid Rice, Hunan Hybrid Rice Research Center, Changsha, 410125, China.
- National Center of Technology Innovation for Saline-Alkali Tolerant Rice in Sanya, Sanya, 572000, China.
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He Z, Chen J, Yuan S, Chen S, Hu Y, Zheng Y, Li D. Iron Plaque: A Shield against Soil Contamination and Key to Sustainable Agriculture. PLANTS (BASEL, SWITZERLAND) 2024; 13:1476. [PMID: 38891285 PMCID: PMC11174575 DOI: 10.3390/plants13111476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 05/14/2024] [Accepted: 05/22/2024] [Indexed: 06/21/2024]
Abstract
Soils play a dominant role in supporting the survival and growth of crops and they are also extremely important for human health and food safety. At present, the contamination of soil by heavy metals remains a globally concerning environmental issue that needs to be resolved. In the environment, iron plaque, naturally occurring on the root surface of wetland plants, is found to be equipped with an excellent ability at blocking the migration of heavy metals from soils to plants, which can be further developed as an environmentally friendly strategy for soil remediation to ensure food security. Because of its large surface-to-volume porous structure, iron plaque exhibits high binding affinity to heavy metals. Moreover, iron plaque can be seen as a reservoir to store nutrients to support the growth of plants. In this review, the formation process of iron plaque, the ecological role that iron plaque plays in the environment and the interaction between iron plaque, plants and microbes, are summarized.
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Affiliation(s)
- Zeping He
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (Z.H.); (S.Y.); (S.C.); (Y.Z.)
| | - Jinyuan Chen
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (Z.H.); (S.Y.); (S.C.); (Y.Z.)
| | - Shilin Yuan
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (Z.H.); (S.Y.); (S.C.); (Y.Z.)
| | - Sha Chen
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (Z.H.); (S.Y.); (S.C.); (Y.Z.)
- Hunan Provincial Engineering Research Center of Lily Germplasm Resource Innovation and Deep Processing, Hunan University of Technology, Zhuzhou 412007, China
- Zhuzhou City Joint Laboratory of Environmental Microbiology and Plant Resources Utilization, Hunan University of Technology, Zhuzhou 412007, China
| | - Yuanyi Hu
- State Key Laboratory of Hybrid Rice, Hunan Hybrid Rice Research Center, Changsha 410125, China;
- National Center of Technology Innovation for Saline-Alkali Tolerant Rice in Sanya, Sanya 572000, China
| | - Yi Zheng
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (Z.H.); (S.Y.); (S.C.); (Y.Z.)
| | - Ding Li
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (Z.H.); (S.Y.); (S.C.); (Y.Z.)
- Hunan Provincial Engineering Research Center of Lily Germplasm Resource Innovation and Deep Processing, Hunan University of Technology, Zhuzhou 412007, China
- Zhuzhou City Joint Laboratory of Environmental Microbiology and Plant Resources Utilization, Hunan University of Technology, Zhuzhou 412007, China
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Yan Z, Meng H, Zhang Q, Bi Y, Gao X, Lei Y. Effects of cadmium and flooding on the formation of iron plaques, the rhizosphere bacterial community structure, and root exudates in Kandelia obovata seedlings. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 851:158190. [PMID: 35995174 DOI: 10.1016/j.scitotenv.2022.158190] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/16/2022] [Accepted: 08/17/2022] [Indexed: 06/15/2023]
Abstract
In the rhizosphere, plant root exudates (REs) serve as a bridge between plant and soil functional microorganisms, which play a key role in the redox cycle of iron (Fe). This study examined the effects of periodic flooding and cadmium (Cd) on plant REs, the rhizosphere bacterial community structure, and the formation of root Fe plaques in the typical mangrove plant Kandelia obovata, as well as the relationship between REs and Fe redox cycling bacteria. Based on two-way analysis of variance, flooding and Cd had a considerable effect on the REs of K. obovata. DOC, NH4+-N, NO3--N, dissolved inorganic phosphorus, acetic acid, and malonic acid concentrations in REs of K. obovata increased considerably with the increase of Cd concentration under 5 and 10 h flooding conditions. Fe plaque development in the plant root was stimulated by flooding and Cd, although flooding was more effective. After Cd treatment, the ways in which Fe-oxidizing bacteria (FeOB) and Fe-reducing bacteria (FeRB) were enriched in the rhizosphere and rhizoplane of plants were different. Thiobacillus and Sideroxydans (dominant FeOB) were more abundant in the plant rhizosphere, whereas Acinetobacter (dominant FeRB) was more abundant in the rhizoplane. Cd considerably decreased the relative abundance of unclassified_f_Gallionellaceae in the rhizosphere and rhizoplane but dramatically enhanced the relative abundance of Thiobacillus, Shewanella, and unclassified_f_Geobacteraceae. Unclassified_f_Geobacteraceae and Thiobacillus exhibited substantial positive correlations with citric acid and DOC in REs in the rhizosphere and rhizoplane but strong negative correlations with Sideroxydans. The findings indicate that Cd and flooding treatments may play a role in the production and breakdown of Fe plaque in K. obovata roots by affecting the relative abundance of Fe redox cycling bacteria in the rhizosphere and rhizoplane.
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Affiliation(s)
- Zhongzheng Yan
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China.
| | - Huijie Meng
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China
| | - Qiqiong Zhang
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China
| | - Yuxin Bi
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China
| | - Xiaoqing Gao
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China
| | - Ying Lei
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China
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Yang Z, Chen Z, He N, Yang D, Liu M. Effects of Silicon and Iron Application on Arsenic Absorption and Physiological Characteristics of Rice (Oryza sativa L.). BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2022; 108:1046-1055. [PMID: 35244752 DOI: 10.1007/s00128-022-03476-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 02/10/2022] [Indexed: 06/14/2023]
Abstract
This study investigated the effects of silicon and iron on arsenic absorption, as well as the changes in the physiological indices of rice under arsenic stress and how these indices respond to silicon and iron. We found that application of silicon and iron reduces arsenic absorption in rice; co-application of silicon and iron reduced arsenic content by 25.6%-27.4%. The antioxidant enzyme activities of rice treated with silicon and iron were significantly lower than those of untreated rice, with the biggest decreases observed under co-application treatments. Iron significantly increased osmoregulatory substances, while silicon increased soluble sugar; Si1Fe1 treatment (containing 1 mM silicon, 0.1 mM iron) had the highest content of osmoregulatory substances except CK. Membership function analysis suggested that applying silicon and iron alone alleviates the stress condition in rice, with the lowest stresses observed under Si1Fe1 treatment. These results show that silicon and iron co-application significantly inhibits arsenic uptake in rice, decreases the antioxidant enzymes activity, while non-enzymatic substances in rice can be regulated to further alleviate arsenic stress.
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Affiliation(s)
- Zehui Yang
- College of Land and Environment, Shenyang Agricultural University, Shenyang, 110866, People's Republic of China
| | - Zexiao Chen
- College of Land and Environment, Shenyang Agricultural University, Shenyang, 110866, People's Republic of China
| | - Na He
- College of Land and Environment, Shenyang Agricultural University, Shenyang, 110866, People's Republic of China
| | - Dan Yang
- College of Land and Environment, Shenyang Agricultural University, Shenyang, 110866, People's Republic of China.
| | - Mingda Liu
- College of Land and Environment, Shenyang Agricultural University, Shenyang, 110866, People's Republic of China.
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Zhang L, Guan Y. Microbial investigations of new hydrogel-biochar composites as soil amendments for simultaneous nitrogen-use improvement and heavy metal immobilization. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127154. [PMID: 34600389 DOI: 10.1016/j.jhazmat.2021.127154] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 08/08/2021] [Accepted: 09/03/2021] [Indexed: 06/13/2023]
Abstract
Agricultural sustainability is challenging because of increasingly serious and co-existing issues, e.g., poor nitrogen-fertilizer use and heavy metal pollution. Herein, we introduced a new poly(acrylic acid)-grafted chitosan and biochar composite (PAA/CTS/BC) for soil amendment, and provided a first microbial insight into how PAA/CTS/BC amendment simultaneously improved nitrogen cycling and immobilized heavy metals. Our results suggest that the PAA/CTS/BC amendment significantly promoted soil ammonium retention, and reduced nitrate accumulation, nitrous oxide emission and ammonia volatilization during the rice cultivation. The availability of various heavy metals (Fe, Mn, Cu, Zn, Ni, Pb, Cr, and As) markedly decreased in the PAA/CTS/BC amended soil, thereby reducing their accumulation in rice root. The PAA/CTS/BC amendment significantly altered the structure and function of soil microbial communities. Importantly, the co-occurrence networks of microbial communities became more complex and function-specific after PAA/CTS/BC addition. For example, the keystone species related to organic matter degradation, denitrification, and plant resistance to pathogen or stresses were enriched within the network. In addition to direct adsorption, the effects of PAA/CTS/BC on shaping microbial communities played dominant roles in the soil amendment. Our findings provide a promising strategy of simultaneous nitrogen-use improvement and heavy metal immobilization for achieving crop production improvement, pollution control, and climate change mitigation.
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Affiliation(s)
- Lixun Zhang
- Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China; Department of Civil and Environmental Engineering, University of California, Irvine, CA 92612, United States
| | - Yuntao Guan
- Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China.
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Hu X, Xie H, Zhuang L, Zhang J, Hu Z, Liang S, Feng K. A review on the role of plant in pharmaceuticals and personal care products (PPCPs) removal in constructed wetlands. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 780:146637. [PMID: 33774296 DOI: 10.1016/j.scitotenv.2021.146637] [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: 01/20/2021] [Revised: 03/14/2021] [Accepted: 03/17/2021] [Indexed: 05/20/2023]
Abstract
Pharmaceuticals and personal care products (PPCPs) cause ongoing water pollution and consequently have attracted wide attention. Constructed wetlands (CWs) show good PPCP removal performance through combined processes of substrates, plants, and microorganisms; however, most published research focuses on the role of substrates and microorganisms. This review summarizes the direct and indirect roles of wetland plants in PPCP removal, respectively. These direct effects include PPCP precipitation on root surface iron plaque, and direct absorption and degradation by plants. Indirect effects, which appear more significant than direct effects, include enhancement of PPCP removal through improved rhizosphere microbial activities (more than twice as much as bulk soil) stimulated by radial oxygen loss and exudate secretions, and the formation of supramolecular ensembles from PPCPs and humic acids from decaying plant materials which improving PPCPs removal efficiency by up to four times. To clarify the internal mechanisms of PPCP removal by plants in CWs, factors affecting wetland plant performance were reviewed. Based on this review, future research needs have been identified.
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Affiliation(s)
- Xiaojin Hu
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Huijun Xie
- Environment Research Institute, Shandong University, Qingdao 266237, China.
| | - Linlan Zhuang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao 266237, China
| | - Jian Zhang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao 266237, China
| | - Zhen Hu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao 266237, China
| | - Shuang Liang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao 266237, China
| | - Kuishuang Feng
- Institute of Blue and Green Development, Weihai Institute of Interdisciplinary Research, Shandong University, Weihai 264209, China
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