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Liu J, Jiang X, Zhang X, Jiang P, Yu G. Rotation of Celosia argentea and Sedum plumbizincicola promotes Cd phytoextraction efficiency. JOURNAL OF HAZARDOUS MATERIALS 2024; 472:134551. [PMID: 38743979 DOI: 10.1016/j.jhazmat.2024.134551] [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: 01/02/2024] [Revised: 04/23/2024] [Accepted: 05/03/2024] [Indexed: 05/16/2024]
Abstract
Most hyperaccumulators cannot maintain vigorous growth throughout the year, which may result in a low phytoextraction efficiency for a few months. In the present study, rotation of two hyperaccumulators is proposed to address this issue. An 18-month field experiment was conducted to evaluate the phytoextraction efficiency of Cd by the monoculture and rotation of Celosia argentea and Sedum plumbizincicola. The results showed that rotation increased amount of extracted Cd increased by 2.3 and 1.6 times compared with monoculture of C. argentea and S. plumbizincicola. In rotation system, the biomass of S. plumbizincicola and Cd accumulation in C. argentea increased by 54.4% and 40.7%, respectively. Rotation reduced fallow time and increased harvesting frequency, thereby enhancing Cd phytoextraction. Planting C. argentea significantly decreased soil pathogenic microbes and increased the abundances of plant growth-promoting rhizobacteria (PGPR) and 1-aminocyclopropane-1-carboxylate (ACC) deaminase genes, which may be beneficial for the growth of S. plumbizincicola. Planting S. plumbizincicola increased the abundance of sulfur oxidization (SOX) system genes and decreased soil pH (p < 0.05), thereby increasing the Cd uptake by C. argentea. These findings indicated that rotation of C. argentea and S. plumbizincicola is a promising method for promoting Cd phytoextraction.
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Affiliation(s)
- Jie Liu
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China; Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area, MNR, Guilin 541004, China.
| | - Xusheng Jiang
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
| | - Xuehong Zhang
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China; Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area, MNR, Guilin 541004, China
| | - Pingping Jiang
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
| | - Guo Yu
- Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area, MNR, Guilin 541004, China
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Fang M, Sun Y, Zhu Y, Chen Q, Chen Q, Liu Y, Zhang B, Chen T, Jin J, Yang T, Zhuang L. The potential of ferrihydrite-synthetic humic-like acid composite as a soil amendment for metal-contaminated agricultural soil: Immobilization mechanisms by combining abiotic and biotic perspectives. ENVIRONMENTAL RESEARCH 2024; 250:118470. [PMID: 38373548 DOI: 10.1016/j.envres.2024.118470] [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: 12/14/2023] [Revised: 02/02/2024] [Accepted: 02/10/2024] [Indexed: 02/21/2024]
Abstract
In-situ passivation technique has attracted increasing attention for metal-contaminated agricultural soil remediation. However, metal immobilization mechanisms are mostly illustrated based on metal speciation changes and alterations in soil physicochemical properties from a macroscopic and abiotic perspective. In this study, a ferrihydrite-synthetic humic-like acid composite (FH-SHLA) was fabricated and applied as a passivator for a 90-day soil incubation. The heavy metals immobilization mechanisms of FH-SHLA were investigated by combining both abiotic and biotic perspectives. Effects of FH-SHLA application on soil micro-ecology were also evaluated. The results showed that the 5%FH-SHLA treatment significantly decreased the DTPA-extractable Pb, Cd and Zn by 80.75%, 46.82% and 63.63% after 90 days of incubation (P < 0.05), respectively. Besides, 5% FH-SHLA addition significantly increased soil pH, soil organic matter content and cation exchange capacity (P < 0.05). The SEM, FTIR, and XPS characterizations revealed that the abiotic metal immobilization mechanisms by FH-SHLA included surface complexation, precipitation, electrostatic attraction, and cation-π interactions. For biotic perspective, in-situ microorganisms synergistically participated in the immobilization process via sulfide precipitation and Fe mineral production. FH-SHLA significantly altered the diversity and composition of the soil microbial community, and enhanced the intensity and complexity of the microbial co-occurrence network. Both metal bioavailability and soil physiochemical parameters played a vital role in shaping microbial communities, while the former contributed more. Overall, this study provides new insight into the heavy metal passivation mechanism and demonstrates that FH-SHLA is a promising and environmentally friendly amendment for metal-contaminated soil remediation.
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Affiliation(s)
- Mingzhi Fang
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Yucan Sun
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Yi Zhu
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Qi Chen
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Qianhui Chen
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Yifei Liu
- Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing, 100012, China
| | - Bing Zhang
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Tan Chen
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Jun Jin
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Ting Yang
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China.
| | - Linlan Zhuang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, 266237, China
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Xu L, Wang G, Zhang S, Li T, Xu X, Gong G, Zhou W, Pu Y, Jia Y, Li Y, Long L. Inhibition of high sulfur on functional microorganisms and genes in slightly contaminated soil by cadmium and chromium. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 344:123421. [PMID: 38253166 DOI: 10.1016/j.envpol.2024.123421] [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: 09/12/2023] [Revised: 11/21/2023] [Accepted: 01/19/2024] [Indexed: 01/24/2024]
Abstract
It is generally accepted that sulfur can passivate the bioavailability of heavy metals in soil, but it is not clear whether high sulfur in cadmium (Cd) and chromium (Cr) contaminated soil has negative effect on soil microbial community and ecological function. In this study, total sulfur (TS) inhibited the Chao 1, Shannon, Phylogenetic diversity (Pd) of bacterial and Pd of fungi in slightly contaminated soil by Cd and Cr around pyrite. TS, total potassium, pH, total chromium, total cadmium, total nitrogen, soil organic matter were the predominant factors for soil microbial community; the contribution of TS in shaping bacterial and fungal communities ranked at first and fifth, respectively. Compared with the low sulfur group, the abundance of sulfur sensitive microorganisms Gemmatimonas, Pseudolabrys, MND1, and Schizothecium were decreased by 68.79-97.22% (p < 0.01) at high sulfur one; the carbon fixation, nitrogen cycling, phosphorus cycling and resistance genes abundance were significantly lower (p < 0.01) at the latter. Such variations were strongly and closely correlated to the suppression of energy metabolism (M00009, M00011, M00086) and carbon fixation (M00173, M00376) functional module genes abundance in the high sulfur group. Collectively, high sulfur significantly suppressed the abundances of functional microorganisms and functional genes in slightly contaminated soil with Cd and Cr, possibly through inhibition of energy metabolism and carbon fixation of functional microorganisms. This study provided new insights into the environmental behavior of sulfur in slightly contaminated soil with Cd and Cr.
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Affiliation(s)
- Longfei Xu
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang, 611130, China.
| | - Guiyin Wang
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang, 611130, China; Sichuan Provincial Key Laboratory of Soil Environmental Protection, Wenjiang, 611130, China
| | - Shirong Zhang
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang, 611130, China; Sichuan Provincial Key Laboratory of Soil Environmental Protection, Wenjiang, 611130, China.
| | - Ting Li
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, China
| | - Xiaoxun Xu
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang, 611130, China; Sichuan Provincial Key Laboratory of Soil Environmental Protection, Wenjiang, 611130, China
| | - Guoshu Gong
- College of Agronomy, Sichuan Agricultural University, Wenjiang, 611130, China
| | - Wei Zhou
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, China
| | - Yulin Pu
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, China
| | - Yongxia Jia
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, China
| | - Yun Li
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, China
| | - Lulu Long
- College of Environmental Sciences, Sichuan Agricultural University, Wenjiang, 611130, China
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Wang Z, Zhang Y, Chen Y, Han F, Shi Y, Pan S, Li Z. Competition of Cd(II) and Pb(II) on the bacterial cells: a new insight from bioaccumulation based on NanoSIMS imaging. Appl Environ Microbiol 2024; 90:e0145323. [PMID: 38224623 PMCID: PMC10880600 DOI: 10.1128/aem.01453-23] [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: 08/30/2023] [Accepted: 12/01/2023] [Indexed: 01/17/2024] Open
Abstract
Polymetallic exposure causes complex toxicity to microorganisms. In this study, we investigated the responses of Escherichia coli under co-existence of cadmium (Cd) and lead (Pb), primarily based on biochemical analysis and RNA sequencing. Cd completely inhibited bacterial growth at a concentration of 2.41 mmol/L, with its removal rate as low as <10%. In contrast, the Pb removal rate was >95% under equimolar sole Pb stress. In addition, the Raman analysis confirmed the loss of proteins for the bacterial cells. Under the co-existence of Cd and Pb, the Cd toxicity to E. coli was alleviated. Meanwhile, the biosorption of Pb cations was more intense during the competitive sorption with Cd. Transmission electron microscopy images showed that a few cells were elongated during incubation, i.e., the average cellular length increased from 1.535 ± 0.407 to 1.845 ± 0.620 µm. Moreover, NanoSIMS imaging showed that the intracellular distribution of Cd and Pb was coupled with sulfur. Genes regulating sulfate transporter were also upregulated to promote sulfate assimilation. Then, the subsequent production of biogenic sulfide and sulfur-containing amino acids was enhanced. Although this strategy based on S enrichment could resist the polymetallic stress, not all related genes were induced to upregulate under sole Cd stress. Therefore, the S metabolism might remodel the microbial resistance to variable occurrence of heavy metals. Furthermore, the competitive sorption (in contrast to sole Cd stress) could prevent microbial cells from strong Cd toxicity.IMPORTANCEMicrobial tolerance and resistance to heavy metals have been widely studied under stress of single metals. However, the polymetallic exposure seems to prevail in the environment. Though microbial resistance can alleviate the effects of exogenous stress, the taxonomic or functional response to polymetallic exposure is still not fully understood. We determined the strong cytotoxicity of cadmium (Cd) on growth, and cell elongation would be driven by Cd stress. The addition of appropriate lead (Pb) showed a stimulating effect on microbial bioactivity. Meanwhile, the biosorption of Pb was more intense during co-existence of Pb and Cd. Our work also revealed the spatial coupling of intracellular S and Cd/Pb. In particular, the S assimilation was promoted by Pb stress. This work elucidated the microbial responses to polymetallic exposure and may provide new insights into the antagonistic function during metal stresses.
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Affiliation(s)
- Zhijun Wang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou, China.
| | - Ying Zhang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Yunhui Chen
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Feiyu Han
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Yixiao Shi
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Shang Pan
- College of Agro-grassland Sciences, Nanjing Agricultural University, Nanjing, China
| | - Zhen Li
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou, China.
- Key Laboratory of Eco-geochemistry, Ministry of Natural Resources, Beijing, China
- Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Nanjing Agricultural University, Nanjing, China
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Zhang L, Hu Y, Chen Y, Qi D, Cai B, Zhao Y, Li Z, Wang Y, Nie Z, Xie J, Wang W. Cadmium-tolerant Bacillus cereus 2-7 alleviates the phytotoxicity of cadmium exposure in banana plantlets. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 903:166645. [PMID: 37657542 DOI: 10.1016/j.scitotenv.2023.166645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 08/05/2023] [Accepted: 08/26/2023] [Indexed: 09/03/2023]
Abstract
Bananas are the world's important fruit and staple crop in the developing countries. Cadmium (Cd) contamination in soils results in the decrease of crop yield and food safety. Bioremediation is an environmental-friendly and effective measure using Cd-tolerant plant growth promoting rhizobacteria (PGPR). In our study, a Cd-resistant PGPR Bacillus cereus 2-7 was isolated and identified from a discarded gold mine. It could produce multiple plant growth promoting biomolecules such as siderophores, indole-3-acetic acid (IAA), 1-aminocyclopropane-1-carboxylate (ACC)-deaminase and phosphatase. The extracellular accumulation was a main manner of Cd removal. Surplus Cd induced the expression of Cd resistance/transport genes of B. cereus 2-7 to maintain the intracellular Cd homeostasis. The pot experiment showed that Cd contents decreased by 50.31 % in soil, 45.43 % in roots, 56.42 % in stems and 79.69 % in leaves after the strain 2-7 inoculation for 40 d. Bacterial inoculation alleviated the Cd-induced oxidative stress to banana plantlets, supporting by the increase of chlorophyll contents, plant height and total protein contents. The Cd remediation mechanism revealed that B. cereus 2-7 could remodel the rhizosphere bacterial community structure and improve soil enzyme activities to enhance the immobilization of Cd. Our study provides a Cd-bioremediation strategy using Cd-resistant PGPR in tropical and subtropical area.
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Affiliation(s)
- Lu Zhang
- National Key Laboratory of Tropical Crop Breeding, Hainan Institute for Tropical Agricultural Resources, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China; Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life Sciences, Hainan Normal University, Haikou, Hainan 571158, China
| | - Yulin Hu
- South Subtropical Crops Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang, Guangzhou 524091, China
| | - Yufeng Chen
- National Key Laboratory of Tropical Crop Breeding, Hainan Institute for Tropical Agricultural Resources, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
| | - Dengfeng Qi
- National Key Laboratory of Tropical Crop Breeding, Hainan Institute for Tropical Agricultural Resources, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
| | - Bingyu Cai
- National Key Laboratory of Tropical Crop Breeding, Hainan Institute for Tropical Agricultural Resources, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
| | - Yankun Zhao
- National Key Laboratory of Tropical Crop Breeding, Hainan Institute for Tropical Agricultural Resources, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
| | - Zhuoyang Li
- National Key Laboratory of Tropical Crop Breeding, Hainan Institute for Tropical Agricultural Resources, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
| | - Yong Wang
- Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life Sciences, Hainan Normal University, Haikou, Hainan 571158, China
| | - Zongyu Nie
- Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life Sciences, Hainan Normal University, Haikou, Hainan 571158, China
| | - Jianghui Xie
- National Key Laboratory of Tropical Crop Breeding, Hainan Institute for Tropical Agricultural Resources, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
| | - Wei Wang
- National Key Laboratory of Tropical Crop Breeding, Hainan Institute for Tropical Agricultural Resources, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China.
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Darma A, Feng Y, He C, Han H, Zandi P, Bloem E, Yang J. Maize straw application reduced cadmium and increased arsenic uptake in wheat and enhanced the rhizospheric bacterial communities in alkaline-contaminated soil. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 347:119138. [PMID: 37783079 DOI: 10.1016/j.jenvman.2023.119138] [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: 03/14/2023] [Revised: 07/01/2023] [Accepted: 08/30/2023] [Indexed: 10/04/2023]
Abstract
Many fields where wheat is grown in northern China are co-polluted by arsenic (As) and cadmium (Cd). Thus, remediation of As and Cd-contaminated alkaline soils is crucial for safe wheat production. In this study, a pot experiment was carried out to investigate the impact of 1% and 2% maize straw (MS) incorporation on As and Cd bioavailability, binding forms, uptake by winter wheat (Triticum aestivum L.), and bacterial communities in smelter (SS) and irrigation (IS) alkaline contaminated soils. The results indicated that 2% MS incorporation significantly (p < 0.05) increased bioavailable-As by 37% (SS) and 39% (IS) with no significant change in the bioavailable-Cd in SS2% (31.95%) from 31.95% (SSCK) and IS2% (33.33%) from 32.82% (ISCK). Incorporation of 2% MS increased the grain As concentration from 0.22 mg kg-1 (SSCK) to 0.51 mg kg-1 (SS2%) and from 0.59 mg kg-1 (ISCK) to 0.84 mg kg-1 (IS2%) which is above the acceptable standard of 0.5 mg kg-1 (GB2726-2017). In contrast, the Cd content in grains was maintained at 0.09 (SS1%), 0.04 (SS2%) and 0.03 (IS1%), 0.02 (IS2%) below the acceptable standard of 0.10 mg kg-1 (GB2762-2017). The amendment through dissolved organic carbon mediated As desorption enhanced As transfer to wheat grain, decreasing DTPA-Cd in the soils and its consequent translocation to wheat leaves and grain. The 2% MS incorporation increased the active As fractions, reduced mobile Cd into immobile fractions, and promoted the abundance of Actinobacteria, Bacteroidetes, and Firmicutes in the two soils. These attributes of MS in decreasing the accumulation of Cd in wheat leaves and grains signified its potential as a suitable ingredient for Cd sequestration and food safety in Cd-contaminated soils.
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Affiliation(s)
- Aminu Darma
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, No. 12 South Zhongguancun Street, Haidian District, Beijing, 100081, China; Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
| | - Ya Feng
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
| | - Chao He
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
| | - Hui Han
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
| | - Peiman Zandi
- International Faculty of Applied Technology, Yibin University, Yibin, 644000, China.
| | - Elke Bloem
- Institute for Crop and Soil Science Julius Kühn-Institut (JKI), Federal Research Centre for Cultivated Plants, Bundesallee 69, 38116, Braunschweig, Germany.
| | - Jianjun Yang
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, No. 12 South Zhongguancun Street, Haidian District, Beijing, 100081, China.
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Tang L, Zhan L, Han Y, Wang Z, Dong L, Zhang Z. Microbial community assembly and functional profiles along the soil-root continuum of salt-tolerant Suaeda glauca and Suaeda salsa. FRONTIERS IN PLANT SCIENCE 2023; 14:1301117. [PMID: 38046600 PMCID: PMC10691491 DOI: 10.3389/fpls.2023.1301117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 11/01/2023] [Indexed: 12/05/2023]
Abstract
Developing and planting salt-tolerant plants has become a promising way to utilize saline-alkali land resources and ensure food security. Root-associated microbes of salt-tolerant plants have been shown to promote plant growth and alleviate high salt stress, yet very little is known about the salt resistance mechanisms of core microbes in different niches. This study characterized the microbial community structures, assembly processes, and functional profiles in four root-related compartments of two salt-tolerant plants by amplicon and shotgun metagenomic sequencing. The results showed that both plants significantly altered the microbial community structure of saline soils, with greater microbial alpha diversity in the rhizosphere or rhizoplane compared with bulk soils. Stochastic process dominated the microbial assembly processes, and the impact was stronger in Suaeda salsa than in S. glauca, indicating that S. salsa may have stronger resistance abilities to changing soil properties. Keystone species, such as Pseudomonas in the endosphere of S. glauca and Sphingomonas in the endosphere of S. salsa, which may play key roles in helping plants alleviate salt stress, were identified by using microbial co-occurrence network analysis. Furthermore, the microbiomes in the rhizoplane soils had more abundant genes involved in promoting growth of plants and defending against salt stress than those in bulk soils, especially in salt-tolerant S. salsa. Moreover, microbes in the rhizoplane of S. salsa exhibited higher functional diversities, with notable enrichment of genes involved in carbon fixation, dissimilar nitrate reduction to ammonium, and sulfite oxidation. These findings revealed differences and similarities in the microbial community assembly, functional profiles and keystone species closely related to salt alleviation of the two salt-tolerant plants. Overall, our study provides new insights into the ecological functions and varied strategies of rhizosphere microbes in different plants under salt stress and highlights the potential use of keystone microbes for enhancing salt resistance of plants.
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Affiliation(s)
- Luyao Tang
- School of Pharmacy, Weifang Medical University, Weifang, Shandong, China
| | - Le Zhan
- School of Pharmacy, Weifang Medical University, Weifang, Shandong, China
| | - Yanan Han
- Key Laboratory of Biological Medicines in Universities of Shandong Province, Weifang Key Laboratory of Antibody Medicines, School of Life Science and Technology, Weifang Medical University, Weifang, Shandong, China
| | - Zhengran Wang
- School of Pharmacy, Weifang Medical University, Weifang, Shandong, China
| | - Lei Dong
- School of Pharmacy, Weifang Medical University, Weifang, Shandong, China
| | - Zhong Zhang
- Key Laboratory of Biological Medicines in Universities of Shandong Province, Weifang Key Laboratory of Antibody Medicines, School of Life Science and Technology, Weifang Medical University, Weifang, Shandong, China
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8
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Zhu Y, An M, Mamut R, Wang H. Comparative analysis of metabolic mechanisms in the remediation of Cd-polluted alkaline soil in cotton field by biochar and biofertilizer. CHEMOSPHERE 2023; 340:139961. [PMID: 37633610 DOI: 10.1016/j.chemosphere.2023.139961] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 08/14/2023] [Accepted: 08/23/2023] [Indexed: 08/28/2023]
Abstract
To screen environmentally friendly and efficient Cd pollution remediation material, the effects of BC and BF on soil Cd bio-availability and cotton Cd absorption were analyzed under Cd exposure. Besides, the differences in metabolic mechanisms by which biochar (BC) and biofertilizer (BF) affect Cd-contaminated soil and cotton were also analyzed. The results showed that the application of BC and BF increased cotton dry matter accumulation, boll number, and single boll weight, and reduced the Cd content in cotton roots, stems, leaves, and bolls. At harvest, the Cd content in cotton roots in the BC and BF groups reduced by 15.23% and 16.33%, respectively, compared with that in the control. This was attributed to the conversion of carbonate-bound Cd (carbon-Cd) and exchangeable Cd (EX-Cd) by BC and BF into residual Cd (Res-Cd). It should be noted that the soil available Cd (Ava-Cd) content in the BF group was lower than that in the BC group. The metabolomic analysis results showed that for BC vs BF, the relative abundance of differential metabolites Caffeic acid, Xanthurenic acid, and Shikimic acid in soil and cotton roots were up-regulated. Mantel test found that cotton root exudate l-Histinine was correlated with the enrichment of Cd in various organs of cotton. Therefore, the application of BC and BF can alleviate Cd stress by reducing soil Ava-Cd content and cotton's Cd uptake, and BF is superior to BC in reducing Cd content in soil and cotton organs. This study will provide a reference for the development of efficient techniques for the remediation of Cd-polluted alkaline soil, and provide a basis for subsequent metagenomics analysis.
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Affiliation(s)
- Yongqi Zhu
- Key Laboratory of Biological Resources and Genetic Engineering of Xinjiang Uygur Autonomous Region, College of Life Science & Technology, Xinjiang University, Urumqi, Xinjiang, 830046, PR China
| | - Mengjie An
- Key Laboratory of Biological Resources and Genetic Engineering of Xinjiang Uygur Autonomous Region, College of Life Science & Technology, Xinjiang University, Urumqi, Xinjiang, 830046, PR China
| | - Reyim Mamut
- Key Laboratory of Biological Resources and Genetic Engineering of Xinjiang Uygur Autonomous Region, College of Life Science & Technology, Xinjiang University, Urumqi, Xinjiang, 830046, PR China.
| | - Haijiang Wang
- Agricultural College, Shihezi University, Shihezi, Xinjiang, 832000, PR China.
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Mao Y, Chang D, Cui X, Wu Y, Cai B. Changes in sulfur in soybean rhizosphere soil and the response of microbial flora in a continuous cropping system mediated by Funneliformis mosseae. Front Microbiol 2023; 14:1235736. [PMID: 37692404 PMCID: PMC10484799 DOI: 10.3389/fmicb.2023.1235736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 08/07/2023] [Indexed: 09/12/2023] Open
Abstract
Soybean is an S-loving crop, and continuous cropping might cause soil sulfur shortage. The primary objectives of this study are to determine whether Funneliformis mosseae (F. mosseae) can enhance the content of available S in S-deficient soil and thereby improve the sulfur utilization rate in soybean. The experiment used Heinong 48 (HN48), a soybean variety with a vast planting area in Heilongjiang Province, and F. mosseae was inoculated in the soil of soybean that had been continuously cropped for 0 and 3 years. The results of the barium sulfur turbidimetric assay show that the sulfur content in the soil and soybean was reduced by continuous cropping and increased by inoculation with F. mosseae; the results of the macro-genome sequencing technology, show that the diversity and abundance of bacteria in the soil was decreased by continuous cropping and increased by inoculation with F. mosseae. The sulfur-oxidizing bacteria (SOB) activity and sulfur-related gene expression levels were lower in the continuous crop group compared to the control group and higher in the F.mosseae-inoculated group compared to the control group. Continuous cropping reduced the sulfur content and ratio of soybean rhizosphere soil, affecting soil flora activity and thus soybean growth; F. mosseae inoculation increased the sulfur content of soybean root-perimeter soil and plants, increased the diversity and abundance of rhizosphere soil microorganisms, increased the expression of genes for sulfur transport systems, sulfur metabolism, and other metabolic functions related to elemental sulfur, and increased the species abundance and metabolic vigor of most SOB. In summary, continuous cropping inhibits soil sulfur uptake and utilization in soybean while the inoculation with F. mosseae can significantly improve this situation. This study offers a theoretical research foundation for using AMF as a bio-fungal agent to enhance soil sulfur use. It also supports the decrease of chemical fertilizers, their substitution, and the protection of native soil.
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Affiliation(s)
- Yizhi Mao
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education and Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region and Key Laboratory of Molecular Biology, College of Heilongjiang Province and School of Life Sciences, Heilongjiang University, Harbin, China
| | - Donghao Chang
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education and Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region and Key Laboratory of Molecular Biology, College of Heilongjiang Province and School of Life Sciences, Heilongjiang University, Harbin, China
| | - Xiaoying Cui
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education and Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region and Key Laboratory of Molecular Biology, College of Heilongjiang Province and School of Life Sciences, Heilongjiang University, Harbin, China
| | - Yunshu Wu
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education and Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region and Key Laboratory of Molecular Biology, College of Heilongjiang Province and School of Life Sciences, Heilongjiang University, Harbin, China
| | - Baiyan Cai
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education and Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region and Key Laboratory of Molecular Biology, College of Heilongjiang Province and School of Life Sciences, Heilongjiang University, Harbin, China
- Hebei Key Laboratory of Agroecological Safety, Hebei University of Environmental Engineering, Qinhuangdao, China
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10
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Zhu B, Li Y, Rensing C, Ye J, Qiu J, Li Q, Wu L, Lu Q, Lin Y, Jia X. Improvement of phenolic acid autotoxicity in tea plantations by Pseudomonas fluorescens ZL22. JOURNAL OF HAZARDOUS MATERIALS 2023; 458:131957. [PMID: 37399720 DOI: 10.1016/j.jhazmat.2023.131957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 06/26/2023] [Accepted: 06/27/2023] [Indexed: 07/05/2023]
Abstract
Accumulation of phenolic acids, such as p-hydroxybenzoic acid (PHBA), 3,4 dihydroxybenzoic acid (PA), and cinnamic acid (CA) causes a decline in tea plantation soil quality. Bacterial strains that can balance phenolic acid autotoxicity (PAA) in tea tree rhizosphere soil are used to improve tea plantation soil. In this study, the effects of Pseudomonas fluorescens ZL22 on soil restoration and PAA regulation in tea plantations were investigated. ZL22 carries a complete pathway for degrading PHBA and PA to acetyl coenzyme A. ZL22 can colonise and reduce PHBA by 96% and PA by 98% in tea rhizosphere soil within 30 days. The cooccurrence of ZL22 and low CA levels further promotes lettuce seed growth and substantially increases tea production. ZL22 effectively regulates PAA to a safe level in rhizospheric soil, alleviating the inhibition of microbiota by PAA, increases the abundance of genera associated with soil N, C, and S cycling, and creates optimum pH (approximately 4.2) and organic carbon (approximately 25 g/kg), and available N (approximately 62 mg/kg) contents for secondary metabolite accumulation in tea leaves. The application of P. fluorescens ZL22 controls PAA, which synergistically improves plant growth and soil nutrition, thereby promoting tea production and quality.
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Affiliation(s)
- Bitong Zhu
- College of Ecology and Resource Engineering, Wuyi University, Wuyishan, China.
| | - Yuanping Li
- College of Tea and Food, Wuyi University, Wuyishan, China
| | - Christopher Rensing
- Institute of Environmental Microbiology, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Jianghua Ye
- College of Tea and Food, Wuyi University, Wuyishan, China
| | - Jialin Qiu
- College of Ecology and Resource Engineering, Wuyi University, Wuyishan, China
| | - Qinji Li
- College of Ecology and Resource Engineering, Wuyi University, Wuyishan, China
| | - Lekang Wu
- College of Ecology and Resource Engineering, Wuyi University, Wuyishan, China
| | - Qianxi Lu
- College of Ecology and Resource Engineering, Wuyi University, Wuyishan, China
| | - Yv Lin
- College of Ecology and Resource Engineering, Wuyi University, Wuyishan, China
| | - Xiaoli Jia
- College of Ecology and Resource Engineering, Wuyi University, Wuyishan, China.
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11
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Pierangeli GMF, da Silva KMR, Coelho LHG, Benassi RF, Domingues MR, Gregoracci GB. Effects of metal contamination with physicochemical properties on the sediment microbial communities in a tropical eutrophic-hypereutrophic urban reservoir in Brazil. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:54961-54978. [PMID: 36881227 DOI: 10.1007/s11356-023-26114-1] [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: 08/10/2022] [Accepted: 02/21/2023] [Indexed: 06/18/2023]
Abstract
We investigated the effects of metals and physicochemical variables on the microbes and their metabolisms in the sediments of Guarapiranga reservoir, a tropical eutrophic-hypereutrophic freshwater reservoir located in a highly urbanized and industrialized area in Brazil. The metals cadmium, copper, and chromium showed minor contribution to changes in the structure, composition, and richness of sediment microbial communities and functions. However, the effects of metals on the microbiota are increased when taken together with physicochemical properties, including the sediment carbon and sulfur, the bottom water electrical conductivity, and the depth of the water column. Clearly, diverse anthropic activities, such as sewage discharge, copper sulfate application to control algal growth, water transfer, urbanization, and industrialization, contribute to increase these parameters and the metals spatially in the reservoir. Microbes found especially in metal-contaminated sites encompassed Bathyarchaeia, MBG-D and DHVEG-1, Halosiccatus, Candidatus Methanoperedens, Anaeromyxobacter, Sva0485, Thermodesulfovibrionia, Acidobacteria, and SJA-15, possibly showing metal resistance or acting in metal bioremediation. Knallgas bacteria, nitrate ammonification, sulfate respiration, and methanotrophy were inferred to occur in metal-contaminated sites and may also contribute to metal removal. This knowledge about the sediment microbiota and metabolisms in a freshwater reservoir impacted by anthropic activities allows new insights about their potential for metal bioremediation in these environments.
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Affiliation(s)
- Gabrielle Maria Fonseca Pierangeli
- Institute of Marine Sciences, Federal University of São Paulo, Rua Dr. Carvalho de Mendonça, 144, Vila Belmiro, Santos, SP, 11070-100, Brazil
| | - Karine Mirelle Rodrigues da Silva
- Center of Engineering, Modeling and Applied Social Sciences, Federal University of ABC, Av dos Estados, 5001, Santo André, SP, 09210-580, Brazil
| | - Lucia Helena Gomes Coelho
- Center of Engineering, Modeling and Applied Social Sciences, Federal University of ABC, Av dos Estados, 5001, Santo André, SP, 09210-580, Brazil.
| | - Roseli Frederigi Benassi
- Center of Engineering, Modeling and Applied Social Sciences, Federal University of ABC, Av dos Estados, 5001, Santo André, SP, 09210-580, Brazil
| | - Mercia Regina Domingues
- Center of Engineering, Modeling and Applied Social Sciences, Federal University of ABC, Av dos Estados, 5001, Santo André, SP, 09210-580, Brazil
| | - Gustavo Bueno Gregoracci
- Institute of Marine Sciences, Federal University of São Paulo, Rua Dr. Carvalho de Mendonça, 144, Vila Belmiro, Santos, SP, 11070-100, Brazil
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12
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Wang Y, Xu Y, Liang X, Li L, Huang Q. Soil addition of MnSO 4 reduces wheat Cd accumulation by simultaneously increasing labile Mn and decreasing labile Cd concentrations in calcareous soil: A two-year pot study. CHEMOSPHERE 2023; 317:137900. [PMID: 36669536 DOI: 10.1016/j.chemosphere.2023.137900] [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: 11/12/2022] [Revised: 01/11/2023] [Accepted: 01/16/2023] [Indexed: 06/17/2023]
Abstract
Cadmium (Cd) pollution of wheat fields is a serious environmental and health problem that warrants attention. Manganese (Mn)-containing materials are considered effective for inhibiting Cd accumulation in Cd-contaminated acidic soils. However, information on the long-term remediation effects of Mn fertilizers on Cd accumulation in wheat and on the microbial community in calcareous soils remain limited. Here, a two-year pot experiment was conducted to assess the performance of 0.05-0.2% MnSO4 addition in Cd-contaminated calcareous soils (total Cd concentration: 3.65 mg/kg) on Cd accumulation in wheat as well as on the soil bacterial community. The formation of Mn oxides and transformation of exchangeable Cd to stable Cd fractions confirmed that the application of MnSO4 significantly decreased CaCl2-extractable Cd concentrations in soil (0-47.08%). In addition, MnSO4 addition improved the antagonistic effect of Cd and Mn ions in the wheat rhizosphere by increasing the available Mn concentration in the soil (1.04-3.52 times), thereby significantly reducing wheat Cd accumulation by 24.66-54.70%. Notably, the addition of MnSO4 did not affect the richness and diversity (P > 0.05) but altered the composition and function of bacterial communities, especially those involved in metabolism and genetic information processing. Importantly, the effects of MnSO4 on Cd immobilization in soil (10.66-47.08%) and the inhibition of Cd accumulation in wheat (12.13-54.30%) can last for two years after one addition. Furthermore, the maximum decrease in Cd concentration in grains was found in the low-Cd wheat cultivar, with values of 31.39-54.70% and 19.94-54.30% in the first and second years, respectively. Based on the present findings, the combination of MnSO4 with a low-Cd wheat cultivar is effective for the safe utilization of Cd-contaminated calcareous soils.
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Affiliation(s)
- Yale Wang
- School of Environmental Engineering, Henan University of Technology, Zhengzhou, Henan, 450001, China; Henan International Joint Laboratory of Environmental Pollution, Remediation and Grain Quality Security, Zhengzhou, Henan, 450001, China; Institute for Carbon Neutrality, Henan University of Technology, Zhengzhou, Henan, 450001, China
| | - Yingming Xu
- Innovation Team of Remediation of Heavy Metal Contaminated Farmlands, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China.
| | - Xuefeng Liang
- Innovation Team of Remediation of Heavy Metal Contaminated Farmlands, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China
| | - Liping Li
- School of Environmental Engineering, Henan University of Technology, Zhengzhou, Henan, 450001, China; Henan International Joint Laboratory of Environmental Pollution, Remediation and Grain Quality Security, Zhengzhou, Henan, 450001, China; Institute for Carbon Neutrality, Henan University of Technology, Zhengzhou, Henan, 450001, China
| | - Qingqing Huang
- Innovation Team of Remediation of Heavy Metal Contaminated Farmlands, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China.
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13
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Cao Y, Ma C, Yu H, Tan Q, Dhankher OP, White JC, Xing B. The role of sulfur nutrition in plant response to metal(loid) stress: Facilitating biofortification and phytoremediation. JOURNAL OF HAZARDOUS MATERIALS 2023; 443:130283. [PMID: 36370480 DOI: 10.1016/j.jhazmat.2022.130283] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 10/11/2022] [Accepted: 10/27/2022] [Indexed: 06/16/2023]
Abstract
Metal(loid)s contamination poses a serious threat to ecosystem biosafety and human health. Phytoremediation is a cost-effective and eco-friendly technology with good public acceptance, although the process does require a significant amount of time for success. To enhance the phytoremediation efficiency, numerous approaches have been explored, including soil amendments application with chelators to facilitate remediation. Sulfur (S), a macronutrient for plant growth, plays vital roles in several metabolic pathways that can actively affect metal(loid)s phytoextraction, as well as attenuate metal(loid) toxicity. In this review, different forms of S-amendments (fertilizers) on uptake and translocation in plants upon exposure to various metal(loid) are evaluated. Possible mechanisms for S application alleviating metal(loid) toxicity are documented at the physiological, biochemical and molecular levels. Furthermore, this review highlights the crosstalk between S-assimilation and other biomolecules, such as phytohormones, polyamines and nitric oxide, which are also important for metal(loid) stress tolerance. Given the effectiveness and potential of S amendments on phytoremediation, future studies should focus on optimizing phytoremediation efficiency in long-term field studies and on investigating the appropriate S dose to maximize the food safety and ecosystem health.
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Affiliation(s)
- Yini Cao
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China; Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
| | - Chuanxin Ma
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
| | - Hao Yu
- Department of Environmental and Biological Sciences, University of Eastern Finland, P. O. Box 1672, 70211 Kuopio, Finland
| | - Qian Tan
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China.
| | - Om Parkash Dhankher
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, United States
| | - Jason C White
- The Connecticut Agricultural Experiment Station, New Haven, CT 06504, United States
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, United States
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14
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Ning Q, Chen L, Li F, Zhou G, Zhang C, Ma D, Zhang J. Tradeoffs of microbial life history strategies drive the turnover of microbial-derived organic carbon in coastal saline soils. Front Microbiol 2023; 14:1141436. [PMID: 37032859 PMCID: PMC10076556 DOI: 10.3389/fmicb.2023.1141436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 02/23/2023] [Indexed: 04/11/2023] Open
Abstract
Stable soil organic carbon (SOC) formation in coastal saline soils is important to improve arable land quality and mitigate greenhouse gas emissions. However, how microbial life-history strategies and metabolic traits regulate SOC turnover in coastal saline soils remains unknown. Here, we investigated the effects of microbial life history strategy tradeoffs on microbial carbon use efficiency (CUE) and microbial-derived SOC formation using metagenomic sequencing technology in different salinity soils. The results showed that high-salinity is detrimental to microbial CUE and microbial-derived SOC formation. Moreover, the regulation of nutrients stoichiometry could not mitigate adverse effects of salt stress on microbial CUE, which indicated that microbial-derived SOC formation is independent of stoichiometry in high-salinity soil. Low-salinity soil is dominated by a high growth yield (Y) strategy, such as higher microbial biomass carbon and metabolic traits which are related to amino acid metabolism, carbohydrate metabolism, and cell processes. However, high-salinity soil is dominated by stress tolerance (S) (e.g., higher metabolic functions of homologous recombination, base excision repair, biofilm formation, extracellular polysaccharide biosynthesis, and osmolytes production) and resource acquisition (A) strategies (e.g., higher alkaline phosphatase activity, transporters, and flagellar assembly). These trade-offs of strategies implied that resource reallocation took place. The high-salinity soil microbes diverted investments away from growth yield to microbial survival and resource capture, thereby decreasing biomass turnover efficiency and impeding microbial-derived SOC formation. Moreover, altering the stoichiometry in low-salinity soil caused more investment in the A-strategy, such as the production of more β-glucosidase and β-N-acetyl-glucosaminidase, and increasing bacterial chemotaxis, which thereby reduced microbial-derived SOC formation. Our research reveals that shift the microbial community from S- and A- strategies to the Y-strategy is important to increase the microbial CUE, and thus enhance SOC turnover in coastal saline soils.
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Affiliation(s)
- Qi Ning
- Fengqiu Experimental Station of National Ecosystem Research Network of China, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Lin Chen
- Fengqiu Experimental Station of National Ecosystem Research Network of China, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Fang Li
- College of Resources and Environment, Henan Agricultural University, Zhengzhou, China
| | - Guixiang Zhou
- Fengqiu Experimental Station of National Ecosystem Research Network of China, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Congzhi Zhang
- Fengqiu Experimental Station of National Ecosystem Research Network of China, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Donghao Ma
- Fengqiu Experimental Station of National Ecosystem Research Network of China, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Jiabao Zhang
- Fengqiu Experimental Station of National Ecosystem Research Network of China, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
- University of Chinese Academy of Sciences, Beijing, China
- *Correspondence: Jiabao Zhang,
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15
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Zhang Y, Li Y, Xu Y, Huang Q, Sun G, Qin X, Wang L. Effects of mercapto-palygorskite application on cadmium accumulation of soil aggregates at different depths in Cd-contaminated alkaline farmland. ENVIRONMENTAL RESEARCH 2023; 216:114448. [PMID: 36183787 DOI: 10.1016/j.envres.2022.114448] [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: 07/26/2022] [Revised: 08/31/2022] [Accepted: 09/25/2022] [Indexed: 06/16/2023]
Abstract
Mercapto-palygorskite (MP) is a novel immobilization material for cadmium (Cd) pollution, but the immobilization mechanism on alkaline Cd contaminated soil is not completely clear. In this paper, field experiment was carried out to study the effect of MP on the transfer of Cd in aggregates at different depth, the contribution of soil aggregates to the reduction of Cd in bulk soil and the immobilization mechanism of MP. The results showed that MP had no significant influence on the total Cd content, soil aggregates distribution, pH value, CEC value and enzyme activities no matter at any depth. At the depth of 0-20 cm, MP significantly reduced the DTPA-Cd in bulk soil by 60.7%, and increased the GWD and R0.25 value. Similarly, the content of DTPA-Cd in the soil aggregates was deceased by 40.2-63.6%, the OM, DOC, available Fe, Mn and S in soil aggregates were significantly increased by 15.0-19.1%, 19.2-41.7%, 24.7-41.2% and 12.5-35.1% respectively. The Cd fraction of aggregates, especially exchangeable Cd (EXE-Cd) and bound to Fe/Mn oxide Cd (OX-Cd), was reduced by 5.4-28.1% and increased by 22.3-50.4%. In addition, MP had different effects on the GSF value of soil aggregates, but there was a downward trend for AFX value at 0-20 cm soil depth. MP almost had no significant influence on the above indexes at the depth of 20-40 cm and 40-60 cm, but except the Cd fraction, the GSF and AFX value in individual aggregates. Small aggregates (<1 mm) and large aggregates (>1 mm) contributed 59.1% and 22% to the reduction of Cd in bulk soil. Partial Least Structural Equation Model (PL-SEM) revealed that S promoted the production of available Fe, Mn, OM and DOC, while the content of DOC inhibited the formation of EXE-Cd and the available Fe and Mn boosted the production of OX-Cd.
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Affiliation(s)
- Yu Zhang
- Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, People's Republic of China
| | - Yanli Li
- Jiyuan Gardening Workstation, Jiyuan, Henan, 459001, People's Republic of China
| | - Yingming Xu
- Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, People's Republic of China.
| | - Qingqing Huang
- Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, People's Republic of China
| | - Guohong Sun
- School of Engineering and Technology, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Xu Qin
- Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, People's Republic of China
| | - Lin Wang
- Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, People's Republic of China
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16
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Nguyen PM, Do PT, Pham YB, Doan TO, Nguyen XC, Lee WK, Nguyen DD, Vadiveloo A, Um MJ, Ngo HH. Roles, mechanism of action, and potential applications of sulfur-oxidizing bacteria for environmental bioremediation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 852:158203. [PMID: 36044953 DOI: 10.1016/j.scitotenv.2022.158203] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 08/17/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
Sulfur (S) is a crucial component in the environment and living organisms. This work is the first attempt to provide an overview and critical discussion on the roles, mechanisms, and environmental applications of sulfur-oxidizing bacteria (SOB). The findings reveal that key enzymes of SOB embarked on oxidation of sulfide, sulfite, thiosulfate, and elemental S. Conversion of reduced S compounds was oxidatively catalyzed by various enzymes (e.g. sulfide: quinone oxidoreductase, flavocytochrome c-sulfide dehydrogenase, dissimilatory sulfite reductase, heterodisulfide reductase-like proteins). Environmental applications of SOB discussed include detoxifying hydrogen sulfide, soil bioremediation, and wastewater treatment. SOB producing S0 engaged in biological S soil amendments (e.g. saline-alkali soil remediation, the oxidation of sulfide-bearing minerals). Biotreatment of H2S using SOB occurred under both aerobic and anaerobic conditions. Sulfide, nitrate, and sulfamethoxazole were removed through SOB suspension cultures and S0-based carriers. Finally, this work presented future perspectives on SOB development, including S0 recovery, SOB enrichment, field measurement and identification of sulfur compounds, and the development of mathematical simulation.
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Affiliation(s)
- Phuong Minh Nguyen
- Faculty of Environmental Sciences, University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam
| | - Phuc Thi Do
- Faculty of Biology, University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam; Key Laboratory of Enzyme and Protein Technology (KLEPT), University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam
| | - Yen Bao Pham
- Key Laboratory of Enzyme and Protein Technology (KLEPT), University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam
| | - Thi Oanh Doan
- Faculty of Environment, Ha Noi University of Natural Resources and Environment, No 41A, Phu Dien Street, Bac Tu Liem, Ha Noi, Vietnam
| | - Xuan Cuong Nguyen
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam; Faculty of Environmental Chemical Engineering, Duy Tan University, Da Nang 550000, Vietnam.
| | - Woo Kul Lee
- Department of Chemical Engineering, Dankook University, 152 Jukjeonro, Yongin 16890, South Korea
| | - D Duc Nguyen
- Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University, 300A Nguyen Tat Thanh, District 4, HCM City, 755414, Vietnam; Department of Environmental Energy Engineering, Kyonggi University, Suwon 16227, South Korea
| | - Ashiwin Vadiveloo
- Algae R & D Centre, Environmental and Conservation Sciences, College of Science, Health, Engineering and Education, 90 South Street, Murdoch, WA 6150, Australia
| | - Myoung-Jin Um
- Department of Civil Engineering, Kyonggi University, Suwon 16227, South Korea
| | - Huu Hao Ngo
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NWS 2007, Australia.
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17
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Stoica C, Dinu LR, Lucaciu IE, Oncu V, Gheorghe S, Nita-Lazar M. Sensitivity of Pathogenic Bacteria Strains to Treated Mine Water. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:15535. [PMID: 36497609 PMCID: PMC9739636 DOI: 10.3390/ijerph192315535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/17/2022] [Accepted: 11/17/2022] [Indexed: 06/17/2023]
Abstract
Mine water as a result of meteoric and/or underground water's contact with tailings and underground workings could have an elevated content of metals associated with sulfate, often acidic, due to the bio-oxidation of sulfides. When entering aquatic ecosystems, the mine water can cause significant changes in the species' trophic levels, therefore a treatment is required to adjust the alkalinity and to remove the heavy metals and metalloids. The conventional mine water treatment removes metals, but in many cases it does not reduce the sulfate content. This paper aimed to predict the impact of conventionally treated mine water on the receiving river by assessing the genotoxic activity on an engineered Escherichia coli and by evaluating the toxic effects generated on two Gram-negative bacterial strains, Pseudomonas aeruginosa and Escherichia coli. Although the main chemical impact is the severe increases of calcium and sulfate concentrations, no significant genotoxic characteristics were detected on the Escherichia coli strain and on the cell-viability with a positive survival rate higher than 80%. Pseudomonas aeruginosa was more resistant than Escherichia coli in the presence of 1890 mg SO42-/L. This paper reveals different sensitivities and adaptabilities of pathogenic bacteria to high concentrations of sulfates in mine waters.
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Affiliation(s)
- Catalina Stoica
- National Research and Development Institute for Industrial Ecology–ECOIND, 57-73 Drumul Podu Dambovitei, Sector 6, 060652 Bucharest, Romania
| | - Laurentiu Razvan Dinu
- National Research and Development Institute for Industrial Ecology–ECOIND, 57-73 Drumul Podu Dambovitei, Sector 6, 060652 Bucharest, Romania
| | - Irina Eugenia Lucaciu
- National Research and Development Institute for Industrial Ecology–ECOIND, 57-73 Drumul Podu Dambovitei, Sector 6, 060652 Bucharest, Romania
| | - Voicu Oncu
- SC CEPROMIN S.A., 22 Decembrie 37A Boulevard, 330166 Deva, Romania
| | - Stefania Gheorghe
- National Research and Development Institute for Industrial Ecology–ECOIND, 57-73 Drumul Podu Dambovitei, Sector 6, 060652 Bucharest, Romania
| | - Mihai Nita-Lazar
- National Research and Development Institute for Industrial Ecology–ECOIND, 57-73 Drumul Podu Dambovitei, Sector 6, 060652 Bucharest, Romania
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18
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Lu Y, Cong P, Kuang S, Tang L, Li Y, Dong J, Song W. Long-term excessive application of K 2SO 4 fertilizer alters bacterial community and functional pathway of tobacco-planting soil. FRONTIERS IN PLANT SCIENCE 2022; 13:1005303. [PMID: 36247599 PMCID: PMC9554487 DOI: 10.3389/fpls.2022.1005303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 09/05/2022] [Indexed: 05/31/2023]
Abstract
To improve tobacco leaf quality, excessive K2SO4 fertilizers were applied to soils in major tobacco-planting areas in China. However, the effects of K2SO4 application on soil microbial community and functions are still unclear. An eight-year field experiment with three kinds of K2SO4 amounts (low amount, K2O 82.57 kg hm-2, LK; moderate amount, K2O 165.07 kg hm-2, MK; high amount, K2O 247.58 kg hm-2, HK) was established to assess the effects of K2SO4 application on the chemical and bacterial characteristics of tobacco-planting soil using 16S rRNA gene and metagenomic sequencing approaches. Results showed that HK led to lower pH and higher nitrogen (N), potassium (K), sulfur(S) and organic matter contents of the soil than LK. The bacterial community composition of HK was significantly different from those of MK and LK, while these of MK and LK were similar. Compared to LK, HK increased the relative abundance of predicted copiotrophic groups (e.g. Burkholderiaceae, Rhodospirillaceae families and Ellin6067 genus) and potentially beneficial bacteria (e.g. Gemmatimonadetes phylum and Bacillus genus) associated with pathogens and heavy metal resistance, N fixation, dissolution of phosphorus and K. While some oligotrophic taxa (e.g. Acidobacteria phylum) related to carbon, N metabolism exhibited adverse responses to HK. Metagenomic analysis suggested that the improvement of pathways related to carbohydrate metabolism and genetic information processing by HK might be the self-protection mechanism of microorganisms against environmental stress. Besides, the redundancy analysis and variation partitioning analysis showed that soil pH, available K and S were the primary soil factors in shifting the bacterial community and KEGG pathways. This study provides a clear understanding of the responses of soil microbial communities and potential functions to excessive application of K2SO4 in tobacco-planting soil.
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Affiliation(s)
- Ya Lu
- Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Ping Cong
- Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Shuai Kuang
- Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Lina Tang
- Tobacco Science Research Institute, Fujian Tobacco Monopoly Administration, Fuzhou, China
| | - Yuyi Li
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jianxin Dong
- Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Wenjing Song
- Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China
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19
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Liu H, Luo L, Jiang G, Li G, Zhu C, Meng W, Zhang J, Jiao Q, Du P, Li X, Fahad S, Jie X, Liu S. Sulfur enhances cadmium bioaccumulation in Cichorium intybus by altering soil properties, heavy metal availability and microbial community in contaminated alkaline soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 837:155879. [PMID: 35568178 DOI: 10.1016/j.scitotenv.2022.155879] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/25/2022] [Accepted: 05/08/2022] [Indexed: 06/15/2023]
Abstract
Cadmium (Cd) contamination seriously threatens the soil health and food safety. Combination of amendment and accumulator plant is a green and effective technique to improve phytoremediation of Cd-contaminated alkaline soil. In this study, a potting experiment was conducted to investigate the effect of sulfur on Cd phytoextraction by Cichorium intybus (chicory). Soil chemical and microbial properties were determined to reveal the mechanism of sulfur-assisting Cd phytoremediation by chicory. Soil pH decreased from 7.77 to the lowest 7.30 with sulfur addition (0.6, 0.9 and 1.2 g kg-1, LS, MS and HS treatment); Electric conductivity, sulfate anion and available cadmium concentration increased gradually with increasing sulfur doses. Cd concentration of shoot and root significantly increased from 1.47 to 4.43 mg kg-1, 6.15 to 20.16 mg kg-1 by sulfur treatment relative to CK, which were attributed to increased available Cd concentration induced by decreased pH. Sulfur treatments significantly increased the Cd bioconcentration factor by 64.1%, 118.6%, 201.0% for shoot, 76.3%, 145.6% and 227.7% for root under LS, MS and HS relative to CK treatment, respectively (P < 0.05). However, only MS treatment significantly improved the Cd removal efficiency by 82.9% in comparison of CK treatment (P < 0.05). Microbial community diversity measured by 16SrRNA showed that Thiobacillus and Actinobacteria were the key and dominant strains of soil microbial communities after sulfur addition, which played a pivotal role in the process of sulfur oxidation involved in decrease of soil pH and the transformation of Cd forms. Correlation analysis and path analysis by structural equation model indicated that soil sulfate anion and Thiobacillus directly affected Cd removal efficiency by chicory in Cd-contaminated alkaline soil. This suggests that combination of sulfur and chicory may provide a way to promote Cd bioaccumulation for phytoremediation of Cd-contaminated alkaline soil.
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Affiliation(s)
- Haitao Liu
- College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China
| | - Lan Luo
- College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China
| | - Guiying Jiang
- College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China.
| | - Gezi Li
- College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China
| | - Changwei Zhu
- College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China
| | - Weiwei Meng
- College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China
| | - Jingjing Zhang
- College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China
| | - Qiujuan Jiao
- College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China
| | - Pengqiang Du
- College of Plant Protection, Henan Agricultural University, Zhengzhou 450002, China
| | - Xuanzhen Li
- College of Forestry, Henan Agricultural University, Zhengzhou 450002, China
| | - Shah Fahad
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresource, College of Tropical Crops, Hainan University, Haikou 570228, China; Department of Agronomy, Faculty of Agricultural Sciences, The University of Haripur, Haripur 22620, Pakistan
| | - Xiaolei Jie
- College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China
| | - Shiliang Liu
- College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China.
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20
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Li J, Wu B, Luo Z, Lei N, Kuang H, Li Z. Immobilization of cadmium by mercapto-functionalized palygorskite under stimulated acid rain: Stability performance and micro-ecological response. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 306:119400. [PMID: 35525516 DOI: 10.1016/j.envpol.2022.119400] [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: 01/19/2022] [Revised: 04/06/2022] [Accepted: 04/30/2022] [Indexed: 06/14/2023]
Abstract
The interaction of cadmium (Cd) pollution and acid rain stress has seriously threatened soil ecosystem and human health. However, there are still few effective amendments for the in-situ remediation in the Cd-contaminated acidified soil. In this study, the performance and mechanisms of palygorskite (PAL) and mercapto-functionalized PAL (MPAL) on Cd immobilization were investigated, and the stability as well as effects on soil micro-ecology under stimulated acid rain were also explored. Results showed that MPAL could react with Cd to form stable Cd-sulfhydryl and Cd-O complexes. The reduction of bioavailable Cd by MPAL was 121.19-164.86% higher than that by PAL. Notably, the Cd immobilization by MPAL remained stable within 90 days in which the concentrations of HOAc-extractable Cd were reduced by 18.28-25.12%, while the reducible and residual fractions were increased by 9.26-18.53% and 54.16%-479.01%, respectively. The sequential acid rain leaching demonstrated that soil after MPAL treatments had a strong H+ resistance, and the immobilized Cd showed prominent stability. In addition, activities of acid phosphatase, catalase and invertase in MPAL treated soil were significantly enhanced by 34.60%, 22.09% and 48.87%, respectively. After MPAL application, bacterial diversity was further improved with diversified sulfur metabolism biomarkers. The decreased abundance of Cd resistance genes including cadA, cadC, czcA, czcB, czcR and zipA also indicated that soil micro-ecology was improved by MPAL. These results showed that MPAL was an effective and eco-friendly amendment for the immobilization of Cd in contaminated soil.
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Affiliation(s)
- Jia Li
- State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, PR China
| | - Bin Wu
- State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, PR China.
| | - Zhi Luo
- State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, PR China
| | - Ningfei Lei
- State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, PR China
| | - Hongjie Kuang
- State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, PR China
| | - Ziqing Li
- State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, PR China
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21
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Wu B, Li J, Peng D, Wang Z, Xu H. Cadmium Exposure Alters Rhizospheric Microbial Community and Transcriptional Expression of Vetiver Grass. FRONTIERS IN PLANT SCIENCE 2022; 13:808844. [PMID: 35283903 PMCID: PMC8914199 DOI: 10.3389/fpls.2022.808844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 01/31/2022] [Indexed: 05/03/2023]
Abstract
Vetiver grass (Chrysopogon zizanioides L.) has been used to remediate cadmium (Cd)-contaminated soil, while there have been few studies on the influence of Cd exposure on the rhizospheric microbial community and transcriptional expression of C. zizanioides. In this study, we investigated the response of the rhizospheric microbial community and transcriptional expression of C. zizanioides in 20 mg/kg Cd-contaminated soil. The results showed that Cd levels in the roots and shoots of C. zizanioides reached 250.80 and 73.40 mg/kg, respectively. The Cd exposure changed the rhizospheric bacterial community, resulting in the significant enrichment of Sphingomonas, Lysobacter, and Gemmatimonadetes in Cd-contaminated soil. In addition, 880 and 3,419 differentially expressed genes were identified in the plant roots and shoots, respectively, in response to Cd stress. Among these, the overexpressed genes associated with redox homeostasis, glutathione (GSH) metabolism, cell wall biosynthesis, and transmembrane transport pathways were found to participate in Cd detoxification in C. zizanioides. These findings could be useful for understanding the selective variation of the rhizospheric microbial community and the detoxification mechanisms of C. zizanioides in Cd phytoremediation.
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Affiliation(s)
- Bin Wu
- College of Ecology and Environment, Chengdu University of Technology, Chengdu, China
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
| | - Jia Li
- College of Ecology and Environment, Chengdu University of Technology, Chengdu, China
| | - Dinghua Peng
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Ziru Wang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Heng Xu
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
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22
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Li Y, Li W, Ji L, Song F, Li T, Fu X, Li Q, Xing Y, Zhang Q, Wang J. Effects of Salinity on the Biodegradation of Polycyclic Aromatic Hydrocarbons in Oilfield Soils Emphasizing Degradation Genes and Soil Enzymes. Front Microbiol 2022; 12:824319. [PMID: 35087508 PMCID: PMC8787140 DOI: 10.3389/fmicb.2021.824319] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 12/21/2021] [Indexed: 11/13/2022] Open
Abstract
The biodegradation of organic pollutants is the main pathway for the natural dissipation and anthropogenic remediation of polycyclic aromatic hydrocarbons (PAHs) in the environment. However, in the saline soils, the PAH biodegradation could be influenced by soil salts through altering the structures of microbial communities and physiological metabolism of degradation bacteria. In the worldwide, soils from oilfields are commonly threated by both soil salinity and PAH contamination, while the influence mechanism of soil salinity on PAH biodegradation were still unclear, especially the shifts of degradation genes and soil enzyme activities. In order to explain the responses of soils and bacterial communities, analysis was conducted including soil properties, structures of bacterial community, PAH degradation genes and soil enzyme activities during a biodegradation process of PAHs in oilfield soils. The results showed that, though low soil salinity (1% NaCl, w/w) could slightly increase PAH degradation rate, the biodegradation in high salt condition (3% NaCl, w/w) were restrained significantly. The higher the soil salinity, the lower the bacterial community diversity, copy number of degradation gene and soil enzyme activity, which could be the reason for reductions of degradation rates in saline soils. Analysis of bacterial community structure showed that, the additions of NaCl increase the abundance of salt-tolerant and halophilic genera, especially in high salt treatments where the halophilic genera dominant, such as Acinetobacter and Halomonas. Picrust2 and redundancy analysis (RDA) both revealed suppression of PAH degradation genes by soil salts, which meant the decrease of degradation microbes and should be the primary cause of reduction of PAH removal. The soil enzyme activities could be indicators for microorganisms when they are facing adverse environmental conditions.
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Affiliation(s)
- Yang Li
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Wenjing Li
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Lei Ji
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Fanyong Song
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Tianyuan Li
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Xiaowen Fu
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Qi Li
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Yingna Xing
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Qiang Zhang
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Jianing Wang
- Shandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
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