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Kraxberger K, Antonielli L, Kostić T, Reichenauer T, Sessitsch A. Diverse bacteria colonizing leaves and the rhizosphere of lettuce degrade azoxystrobin. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 891:164375. [PMID: 37245813 DOI: 10.1016/j.scitotenv.2023.164375] [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: 03/18/2023] [Revised: 05/03/2023] [Accepted: 05/19/2023] [Indexed: 05/30/2023]
Abstract
Concerns about the possible effects of pesticide residues on both the environment and human health have increased worldwide. Bioremediation by the use of microorganisms to degrade or remove these residues has emerged as a powerful technology. However, the knowledge about the potential of different microorganisms for pesticide degradation is limited. This study focused on the isolation and characterisation of bacterial strains with the potential to degrade the active fungicide ingredient azoxystrobin. Potential degrading bacteria were tested in vitro and in the greenhouse, and the genomes of the best degrading strains were sequenced and analysed. We identified and characterised 59 unique bacterial strains, which were further tested in vitro and in greenhouse trials for their degradation activity. The best degraders from a foliar application trial in the greenhouse were identified as Bacillus subtilis strain MK101, Pseudomonas kermanshahensis strain MK113 and Rhodococcus fascians strain MK144 and analysed by whole genome sequencing. Genome analysis revealed that these three bacterial strains encode several genes predicted to be involved in the degradation of pesticides e.g., benC, pcaG, pcaH, however we could not find any specific gene previously reported to be involved in azoxystrobin degradation e.g., strH. Genome analysis pinpointed to some potential activities involved in plant growth promotion.
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Affiliation(s)
| | - Livio Antonielli
- AIT Austrian Institute of Techonology, GmbH, Center for Health & Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria
| | - Tanja Kostić
- AIT Austrian Institute of Techonology, GmbH, Center for Health & Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria
| | - Thomas Reichenauer
- AIT Austrian Institute of Techonology, GmbH, Center for Health & Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria
| | - Angela Sessitsch
- AIT Austrian Institute of Techonology, GmbH, Center for Health & Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria.
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Wang Y, Wu J, Zhao L, Sun W, Yan S, Tian S, Zhao Q, Zhu W. A powerful helper of azoxystrobin degradation-the unique mechanism of UGT72E2 promoting environmental degradation of azoxystrobin. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:87588-87598. [PMID: 37428316 DOI: 10.1007/s11356-023-28343-w] [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: 02/06/2023] [Accepted: 06/15/2023] [Indexed: 07/11/2023]
Abstract
In recent years, environmental pollutants such as pesticide residues have become one of the severe public problems that endanger the ecological environment and affect human health. The development of biotechnology to rapidly and efficiently degrade pesticides is essential to reduce their environmental risks. Azoxystrobin (AZ) is representative of the most widely used agricultural fungicide in the world. A large number of studies have shown that AZ has toxic effects on non-target organisms such as fish, algae, earthworms, etc., which may pose a potential threat to the environmental ecosystem. Therefore, it is particularly important to develop new AZ phytoremediation methods. Based on the constructed Arabidopsis UGT72E2 knockout (KO) and overexpression (OE) lines, this study found that overexpression of UGT72E2 in Arabidopsis can enhance resistance to exogenous AZ stress and maintain a relatively stable physiological state while enhancing the metabolic degradation of AZ. Correspondingly, knockout mutants showed the opposite results. The results showed that the AZ glycosylation and malonyl glycosylation products produced by UGT72E2 overexpression lines increased by 10%~20% compared with normal lines, and increased by 7%~47% compared with gene knockout plants, and exhibited lower phytotoxicity. In summary, our findings highlight the critical role of UGT72E2 overexpression in constructing new varieties of phytoremediation and may provide new ideas for reducing the indirect or direct risks of pesticides or other environmental pollutants to non-target organisms and improving biological and environmental resilience.
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Affiliation(s)
- Yu Wang
- Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Yuanmingyuan west road 2, Beijing, 100193, People's Republic of China
| | - Jie Wu
- Shenzhen Key Laboratory of Synthetic Genomics, Guangdong Provincial Key Laboratory of Synthetic Genomics, CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen, 518055, People's Republic of China
| | - Lingling Zhao
- Shenzhen Key Laboratory of Synthetic Genomics, Guangdong Provincial Key Laboratory of Synthetic Genomics, CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen, 518055, People's Republic of China
| | - Wei Sun
- Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Yuanmingyuan west road 2, Beijing, 100193, People's Republic of China
| | - Sen Yan
- Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Yuanmingyuan west road 2, Beijing, 100193, People's Republic of China
| | - Sinuo Tian
- Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Yuanmingyuan west road 2, Beijing, 100193, People's Republic of China
| | - Qiao Zhao
- Shenzhen Key Laboratory of Synthetic Genomics, Guangdong Provincial Key Laboratory of Synthetic Genomics, CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen, 518055, People's Republic of China
| | - Wentao Zhu
- Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Yuanmingyuan west road 2, Beijing, 100193, People's Republic of China.
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Qu Y, Tang J, Liu B, Lyu H, Duan Y, Yang Y, Wang S, Li Z. Rhizosphere enzyme activities and microorganisms drive the transformation of organic and inorganic carbon in saline-alkali soil region. Sci Rep 2022; 12:1314. [PMID: 35079055 PMCID: PMC8789911 DOI: 10.1038/s41598-022-05218-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 01/10/2022] [Indexed: 11/09/2022] Open
Abstract
Western Jilin Province is one of the world's three major saline-alkali land distribution areas, and is also an important area of global climate change and carbon cycle research. Rhizosphere soil microorganisms and enzymes are the most active components in soil, which are closely related to soil carbon cycle and can reflect soil organic carbon (SOC) dynamics sensitively. Soil inorganic carbon (SIC) is the main existing form of soil carbon pool in arid saline-alkali land, and its quantity distribution affects the pattern of soil carbon accumulation and storage. Previous studies mostly focus on SOC, and pay little attention to SIC. Illumina Miseq high-throughput sequencing technology was used to reveal the changes of community structure in three maize fields (M1, M2 and M3) and three rice fields (R1, R2 and R3), which were affected by different levels of salinization during soil development. It is a new research topic of soil carbon cycle in saline-alkali soil region to investigate the effects of soil microorganisms and soil enzymes on the transformation of SOC and SIC in the rhizosphere. The results showed that the root-soil-microorganism interaction was changed by saline-alkali stress. The activities of catalase, invertase, amylase and β-glucosidase decreased with increasing salinity. At the phylum level, most bacterial abundance decreases with increasing salinity. However, the relative abundance of Proteobacteria and Firmicutes in maize field and Firmicutes, Proteobacteria and Nitrospirae in rice field increased sharply under saline-alkali stress. The results of redundancy analysis showed that the differences of rhizosphere soil between the three maize and three rice fields were mainly affected by ESP, pH and soil salt content. In saline-alkali soil region, β-glucosidase activity and amylase were significantly positively correlated with SOC content in maize fields, while catalase and β-glucosidase were significantly positively correlated with SOC content in rice fields. Actinobacteria, Bacteroidetes and Verrucomicrobia had significant positive effects on SOC content of maize and rice fields. Proteobacteria, Gemmatimonadetes and Nitrospirae were positively correlated with SIC content. These enzymes and microorganisms are beneficial to soil carbon sequestration in saline-alkali soils.
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Affiliation(s)
- Yunke Qu
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130012, China.,College of New Energy and Environment, Jilin University, Changchun, 130012, China
| | - Jie Tang
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
| | - Ben Liu
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
| | - Hang Lyu
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
| | - Yucong Duan
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
| | - Yao Yang
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
| | - Sining Wang
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
| | - Zhaoyang Li
- College of New Energy and Environment, Jilin University, Changchun, 130012, China.
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McKnight AM, Gannon TW, Yelverton F. Phytoremediation of azoxystrobin and imidacloprid by wetland plant species Juncus effusus, Pontederia cordata and Sagittaria latifolia. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2021; 24:196-204. [PMID: 34126808 DOI: 10.1080/15226514.2021.1932726] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Azoxystrobin (strobilurin fungicide) and imidacloprid (neonicotinoid insecticide) have been detected in surface waters near treated agricultural, urban, and mixed landscapes. The hazards of pesticide runoff can be prevented through best management practices, including the establishment of diverse wetland plant barriers that can phytoremediate the chemicals in which they come into contact with. In this study, the wetland plant species softrush (Juncus effusus), pickerelweed (Pontederia cordata), and arrowhead (Sagittaria latifolia) were planted in sandy soil containers that were then placed in azoxystrobin or imidacloprid treated water. Every week for 2 months, water samples were collected for pesticide residue analysis using high-performance liquid chromatography (HPLC). At 14, 28, and 56 days after initiation, plants were destructively harvested and analyzed for pesticide residue in soil, above-ground vegetation, and below-ground vegetation. Results from this study report P. cordata reduced greater azoxystrobin (51.7% reduction compared to treated non-planted containers) compared to J. effusus and S. latifolia (24.9% and 28.7% reduction from non-planted containers) at 56 days. However, S. latifolia reduced greater imidacloprid (79.3% reduction compared to non-planted containers) compared to J. effusus and P. cordata (36.0% and 37.1% reduction from non-planted containers) at 56 days.Novelty statement: While research has found that wetland plants can absorb and remediate synthetic chemicals, this practice is only sustainable if used with native plants that require low maintenance and are tolerant to the applied substances. Various previous studies observe plants that are fast-growing, tolerant to environmental conditions, require low-maintenance, and are hardy. However, these plant species are not always suitable for any location and are often considered invasive and/or weed-like. The present research initiates a list of plant species which can be used within the southeastern United States and similar areas to phytoremediate commonly used pesticides azoxystrobin and imidacloprid and prevent off-target movement into sensitive water systems.
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Affiliation(s)
- Alayne M McKnight
- Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
| | - Travis W Gannon
- Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
| | - Fred Yelverton
- Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
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Aleksova M, Kenarova A, Boteva S, Georgieva S, Chanev C, Radeva G. Effects of increasing concentrations of fungicide Quadris R on bacterial functional profiling in loamy sand soil. Arch Microbiol 2021; 203:4385-4396. [PMID: 34117918 DOI: 10.1007/s00203-021-02423-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 05/16/2021] [Accepted: 06/02/2021] [Indexed: 11/29/2022]
Abstract
A mesocosm experiment was conducted to assess the side effects of the fungicide QuadrisR on soil bacterial functioning. QuadrisR was applied to a loamy sand soil at increasing concentrations (0.0-35.0 mg kg-1 dry soil) calculated according to its active ingredient azoxystrobin (Az). Soil sampling was carried out from the 1st to the 120th day of soil incubation to determine the changes occurred in bacterial catabolism using the technique of community-level physiological profiling (CLPP) via Biolog EcoPlates™. It was found that the field recommended fungicide concentration (2.90 mg kg-1 dry soil) altered mostly the low-available Biolog carbon sources (< 0.50 optical density (OD)), whereas the fungicide higher concentrations (14.65 and 35.00 mg kg-1 dry soil) were effective also on medium (0.50-1.00 OD) and highly (> 1.00 OD) utilizable ones. Pearson correlation analysis revealed that the main environmental factors correlated with the utilization rates of Biolog carbon sources (CSs) were soil nutrients and pH. No linear relationships were found between Az soil residues and the use of CSs. We concluded that QuadrisR affects bacterial catabolic profiles in loamy sand soils through soil acidification and altering soil nutrient pool. The study also revealed that CLPP and EcoPlate™ are useful practical tools for testing the fungicide ecotoxicity.
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Affiliation(s)
- Michaella Aleksova
- Institute of Molecular Biology "Acad. Roumen Tsanev", Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113, Sofia, Bulgaria
| | - Anelia Kenarova
- Department of Ecology and Nature Conservation, Faculty of Biology, Sofia University "St. Kl. Ohridski", 8 Dragan Tsankov Blvd, 1164, Sofia, Bulgaria
| | - Silvena Boteva
- Department of Ecology and Nature Conservation, Faculty of Biology, Sofia University "St. Kl. Ohridski", 8 Dragan Tsankov Blvd, 1164, Sofia, Bulgaria.
| | - Stela Georgieva
- Department of Organic Chemistry and Pharmacognosy, Faculty of Chemistry and Pharmacy, Sofia University "St. Kl. Ohridski", 1 James Bourchier Blvd, 1164, Sofia, Bulgaria
| | - Christo Chanev
- Department of Organic Chemistry and Pharmacognosy, Faculty of Chemistry and Pharmacy, Sofia University "St. Kl. Ohridski", 1 James Bourchier Blvd, 1164, Sofia, Bulgaria
| | - Galina Radeva
- Institute of Molecular Biology "Acad. Roumen Tsanev", Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113, Sofia, Bulgaria
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State-of-the-Art Review of the Applicability and Challenges of Microbial-Induced Calcite Precipitation (MICP) and Enzyme-Induced Calcite Precipitation (EICP) Techniques for Geotechnical and Geoenvironmental Applications. CRYSTALS 2021. [DOI: 10.3390/cryst11040370] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The development of alternatives to soil stabilization through mechanical and chemical stabilization has paved the way for the development of biostabilization methods. Since its development, researchers have used different bacteria species for soil treatment. Soil treatment through bioremediation techniques has been used to understand its effect on strength parameters and contaminant remediation. Using a living organism for binding the soil grains to make the soil mass dense and durable is the basic idea of soil biotreatment. Bacteria and enzymes are commonly utilized in biostabilization, which is a common method to encourage ureolysis, leading to calcite precipitation in the soil mass. Microbial-induced calcite precipitation (MICP) and enzyme-induced calcite precipitation (EICP) techniques are emerging trends in soil stabilization. Unlike conventional methods, these techniques are environmentally friendly and sustainable. This review determines the challenges, applicability, advantages, and disadvantages of MICP and EICP in soil treatment and their role in the improvement of the geotechnical and geoenvironmental properties of soil. It further elaborates on their probable mechanism in improving the soil properties in the natural and lab environments. Moreover, it looks into the effectiveness of biostabilization as a remediation of soil contamination. This review intends to present a hands-on adoptable treatment method for in situ implementation depending on specific site conditions.
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Raimondo EE, Saez JM, Aparicio JD, Fuentes MS, Benimeli CS. Bioremediation of lindane-contaminated soils by combining of bioaugmentation and biostimulation: Effective scaling-up from microcosms to mesocosms. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 276:111309. [PMID: 32882521 DOI: 10.1016/j.jenvman.2020.111309] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 08/19/2020] [Accepted: 08/23/2020] [Indexed: 06/11/2023]
Abstract
The scaling-up of lindane-contaminated soils bioremediation from microcosms to mesocosms bioaugmentated with an actinobacteria quadruple culture and biostimulated with sugarcane filter cake (SCFC) was surveyed. Mesocosms of silty loam soil, clayey soil, and sandy soil were polluted with the pesticide, bioaugmented with the mixed culture, biostimulated with adequate amounts of 0.5 mm SCFC particles, and assessed during 63 days maintaining environmental parameters with minimal intervention. Samples were taken to determine residual lindane, heterotrophic microorganisms, enzymatic activities, and bioremediation effectiveness using ecotoxicity tests with Raphanus sativus, Lactuca sativa, and Lycopersicon esculentum. The bioaugmentation and biostimulation of the three soils improved lindane removal, microbial counts, and enzymatic activities, and reduced pesticide T1/2, regarding the values obtained in non-bioremediated controls. The removal process was significantly affected by the soil type, and the highest pesticide dissipation (82.6%) was detected in bioremediated sandy soil. Ecotoxicity tests confirmed the bioremediation success through a rise in the vigor index of seedlings compared to non-treated soils (R. sativus: 12-22%; L. sativa: 12-20%; L. esculentum: 30-45%). Finally, scanning electron microscopy corroborated soil colonization by actinobacteria. Successful scaling-up of the combined application of an actinobacteria quadruple culture and SCFC as an appropriate strategy for restoring lindane-polluted soils at mesocosms-scale was confirmed.
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Affiliation(s)
- Enzo E Raimondo
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina; Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, 4000, Tucumán, Argentina
| | - Juliana M Saez
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina; Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Miguel Lillo 205, 4000, Tucumán, Argentina
| | - Juan D Aparicio
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina; Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, 4000, Tucumán, Argentina
| | - María S Fuentes
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina
| | - Claudia S Benimeli
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Catamarca, Belgrano 300, 4700, Catamarca, Argentina.
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Soil Enzyme Activity and Microbial Metabolic Function Diversity in Soda Saline–Alkali Rice Paddy Fields of Northeast China. SUSTAINABILITY 2020. [DOI: 10.3390/su122310095] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Western Jilin province has the most serious area of soda salinization in Northeast China, which affects and restricts the sustainable development of agriculture. The effects of physico-chemical properties of rhizosphere and non-rhizosphere soil on soil microbial diversity and enzyme activities (polyphenol oxidase, catalase, invertase, amylase) were evaluated in typical soda saline-alkali paddy field. Community-level physiological profile (CLPP) based on Biolog-ECO plates was used to assess the functional diversity of soil microorganisms. Exchangeable sodium percentage (ESP) and pH were negative correlated with the microbial activity (AWCD), soil enzyme activities (amylase, sucrose, and catalase, except for polyphenol oxidase) in rice rhizosphere and non-rhizosphere soil (P < 0.05). The indexes of microbial diversity in rice rhizosphere soil were significantly higher than that of non-rhizosphere soil. The utilization of amino acids by rice rhizosphere microorganisms was relatively high, while non-rhizosphere soil had relatively high utilization of carboxylic acid, phenolic acid, and amine. Among the selected physico-chemical properties, soil organic carbon (SOC) and soil water content (SWC) had the greatest influence on the variation of microbial diversity indexes and enzyme activities in rhizosphere soil. ESP and pH showed a significant positive correlation with carbon source utilization, especially for amine (AM) and phenolic acid (PA) carbon source utilization (P < 0.05) by means of RDA, and the utilization rate of AM and PA carbon sources by rice rhizosphere and non-root soil microorganisms was P1 < P2 < P3.
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Sadañoski MA, Tatarin AS, Barchuk ML, Gonzalez M, Pegoraro CN, Fonseca MI, Levin LN, Villalba LL. Evaluation of bioremediation strategies for treating recalcitrant halo-organic pollutants in soil environments. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 202:110929. [PMID: 32800215 DOI: 10.1016/j.ecoenv.2020.110929] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 06/19/2020] [Accepted: 06/20/2020] [Indexed: 06/11/2023]
Abstract
The aim of this study was to investigate the bioremediation potential of polychlorinated biphenyls (PCBs) in soil, mimicking three strategies: (a) mycoaugmentation: by the addition of Trametes sanguinea and Pleurotus sajor-caju co-cultures immobilized on sugarcane bagasse; (b) biostimulation: by supplementation of sugarcane bagasse; and (c) natural attenuation: no amendments. The experiments were done in microcosms using Ultisol soil. Remediation effectiveness was assessed based on pollutants content, soil characteristics, and ecotoxicological tests. Biostimulation and mycoaugmentation demonstrated the highest PCBs-removal (approx. 90%) with a significant toxicity reduction at 90 d. The studied strains were able to survive during the incubation period in non-sterilized soil. Laccase, manganese-peroxidase and endoxylanase activities increased significantly in co-cultures after 60 d. Sugarcane bagasse demonstrated to be not only a suitable support for fungal immobilization but also an efficient substrate for fungal colonization of PCBs-contaminated soils. Mycoaugmentation and biostimulation with sugarcane bagasse improved oxidable organic matter and phosphorous contents as well as dehydrogenase activity in soil. Therefore, biostimulation with sugarcane bagasse and mycoaugmentation applying dual white-rot fungal cultures constitute two efficient bioremediation alternatives to restore PCBs-contaminated soils.
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Affiliation(s)
- Marcela Alejandra Sadañoski
- Laboratorio de Biotecnología Molecular, Instituto de Biotecnología Misiones, CONICET, Facultad de Ciencias Exactas Químicas y Naturales, Universidad Nacional de Misiones, CP3300, Posadas, Misiones, Argentina.
| | - Ana Silvia Tatarin
- Laboratorio de Biotecnología Molecular, Instituto de Biotecnología Misiones, CONICET, Facultad de Ciencias Exactas Químicas y Naturales, Universidad Nacional de Misiones, CP3300, Posadas, Misiones, Argentina
| | - Mónica Lucrecia Barchuk
- Laboratorio de Biotecnología Molecular, Instituto de Biotecnología Misiones, CONICET, Facultad de Ciencias Exactas Químicas y Naturales, Universidad Nacional de Misiones, CP3300, Posadas, Misiones, Argentina
| | - Mariana Gonzalez
- Estresores Múltiples en El Ambiente (EMA), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar Del Plata, IIMyC, CONICET, B7602AYL, Mar Del Plata, Argentina
| | - César Nicolás Pegoraro
- Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar Del Plata, CONICET, B7602AYL, Mar Del Plata, Argentina
| | - María Isabel Fonseca
- Laboratorio de Biotecnología Molecular, Instituto de Biotecnología Misiones, CONICET, Facultad de Ciencias Exactas Químicas y Naturales, Universidad Nacional de Misiones, CP3300, Posadas, Misiones, Argentina
| | - Laura Noemí Levin
- Laboratorio de Micología Experimental, Dpto. de Biodiversidad y Biología Experimental, FCEN, UBA, INMIBO (CONICET), 1428, CABA, Argentina
| | - Laura Lidia Villalba
- Laboratorio de Biotecnología Molecular, Instituto de Biotecnología Misiones, CONICET, Facultad de Ciencias Exactas Químicas y Naturales, Universidad Nacional de Misiones, CP3300, Posadas, Misiones, Argentina
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Raimondo EE, Aparicio JD, Bigliardo AL, Fuentes MS, Benimeli CS. Enhanced bioremediation of lindane-contaminated soils through microbial bioaugmentation assisted by biostimulation with sugarcane filter cake. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 190:110143. [PMID: 31918254 DOI: 10.1016/j.ecoenv.2019.110143] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 12/24/2019] [Accepted: 12/27/2019] [Indexed: 06/10/2023]
Abstract
Lindane is a toxic and persistent organochlorine pesticide, whose extensive use generated its accumulation in different environmental matrices. Bioremediation is a promising technology that can be used combining bioaugmentation and biostimulation processes to soil restoration. The aim of the present work was to determine the conditions of maximum lindane removal by bioaugmentation with an actinobacteria consortium and biostimulation with sugarcane filter cake (SCFC). The assays were carried out on lindane-contaminated silty loam (SLS), clayey (CS), and sandy (SS) soils. Through complete factorial designs, the effects of three abiotic factors (moisture content, proportion and size of SCFC particles) were evaluated on lindane removal. In addition, a response optimizer determined the optimal conditions for pesticide removal in bioaugmented and biostimulated soils, in the range of levels studied for each factor. In these conditions, bioaugmentation of biostimulated soils increased the pesticide removal (SLS: 61.4%, CS: 70.8%, SS: 86.3%), heterotrophic microbial counts, and soil enzymatic activities, and decreased lindane T1/2, regarding the non-bioaugmented biostimulated controls, after 14 days of assay. The values of these parameters confirmed the efficiency of the bioremediation process. Finally, the viability of the four strains was demonstrated at the end of the assay. The results indicate that the simultaneous application of bioaugmentation with the actinobacteria consortium and biostimulation with SCFC constitutes a promising tool for restoring soils contaminated with lindane, by using the optimal conditions obtained through the factorial designs.
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Affiliation(s)
- Enzo E Raimondo
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina; Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, 4000, Tucumán, Argentina
| | - Juan D Aparicio
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina; Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, 4000, Tucumán, Argentina
| | - Ana L Bigliardo
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina
| | - María S Fuentes
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina
| | - Claudia S Benimeli
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Catamarca, Belgrano 300, 4700, Catamarca, Argentina.
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Raimondo EE, Saez JM, Aparicio JD, Fuentes MS, Benimeli CS. Coupling of bioaugmentation and biostimulation to improve lindane removal from different soil types. CHEMOSPHERE 2020; 238:124512. [PMID: 31430718 DOI: 10.1016/j.chemosphere.2019.124512] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 08/01/2019] [Accepted: 08/03/2019] [Indexed: 06/10/2023]
Abstract
Lindane is an organochlorine pesticide that, due to its persistence in the environment, is still detected in different matrices. Bioremediation using actinobacteria consortia proved to be promising for the restoration of contaminated soils. Another alternative to remove xenobiotics is to use agricultural residues, which stimulates microbial activity, increasing its capacity to degrade organic pollutants. The present work studies the coupling of sugarcane bagasse biostimulation and bioaugmentation with the actinobacteria consortium composed of Streptomyces sp. A2, A5, A11 and M7 on lindane removal in different soil types. In this sense, factorial designs with three factors (proportion and size of sugarcane bagasse particles, and moisture content) were employed. A response optimizer identified the combination of factors levels that jointly allowed obtaining the maximum lindane removal in the evaluated conditions. In the optimal conditions, the effect of the bioremediation process on soil microbiota was studied by evaluating different parameters. The highest lindane removal percentages were detected in biostimulated microcosms bioaugmented with the microbial consortium, which were accompanied by a decrease in lindane half-life respect to the controls. Also, the bioaugmentation of biostimulated microcosms increased the microbial counts and enhanced soil enzymatic activities, corroborating the bioremediation process efficiency. The survival of the four actinobacteria at the end of the assay confirmed the ability of all Streptomyces strains to colonize amended soils. Bioremediation by simultaneous application of biostimulation with sugarcane bagasse and bioaugmentation with the actinobacteria consortium, in the optimized conditions, represents an efficient strategy to restore lindane contaminated soils.
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Affiliation(s)
- Enzo E Raimondo
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina
| | - Juliana M Saez
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina
| | - Juan D Aparicio
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina; Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, 4000, Tucumán, Argentina
| | - María S Fuentes
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina
| | - Claudia S Benimeli
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Catamarca, Belgrano 300, 4700, Catamarca, Argentina.
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Oladipo OG, Burt AF, Maboeta MS. Effect of Bacillus cereus on the ecotoxicity of metal-based fungicide spiked soils: Earthworm bioassay. ECOTOXICOLOGY (LONDON, ENGLAND) 2019; 28:37-47. [PMID: 30430303 DOI: 10.1007/s10646-018-1997-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/26/2018] [Indexed: 06/09/2023]
Abstract
Soil microorganisms exhibit varying levels of metal tolerance across a diverse range of environmental conditions. The use of metal-based fungicides such as mancozeb and copper oxychloride could potentially result in increased levels of manganese, zinc and copper which may adversely affect soil mesofauna. Under standardized earthworm bioassay conditions (temperature, pH, soil type and water content), we investigated the effect of Bacillus cereus on mancozeb and copper oxychloride ecotoxicity towards Eisenia andrei. A metal-tolerant Bacillus cereus strain previously isolated from a gold mining site was introduced into fungicide spiked soils. Earthworms were exposed to bacterial inoculated and non-inoculated substrates of mancozeb (8, 44, 800 and 1250 mg kg-1) and copper oxychloride (200, 450, 675 and 1000 mg kg-1). Experimental trials assessed avoidance-behavior, growth and reproduction utilizing standardized protocols (ISO and OECD). In the avoidance-behavior, E. andrei showed significant (p< 0.05) preference for inoculated substrates. Further, significant (p< 0.05) increases in biomass, survival, cocoons, juveniles and lower soil and tissue Mn, Cu and Zn contents were recorded at 8 and 44 mg kg-1 mancozeb and copper oxychloride 200 and 450 mg kg-1 inoculated soils compared to non-inoculated. However, at 800 and 1250 mg kg-1 mancozeb and 675 and 1000 mg kg-1 copper oxychloride concentrations, reproductive success in both inoculated and non-inoculated treatments was negatively (p< 0.05) affected. In conclusion, Bacillus cereus decreased the ecotoxicity of metal-based fungicides towards Eisenia andrei at 8 and 44 mg kg-1 mancozeb and 200 and 450 mg kg-1 copper oxychloride concentrations. The outcome observed with the inoculated substrates at elevated fungicides concentrations maybe as a result of the environmental conditions (pH and temperature).
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Affiliation(s)
- Oluwatosin G Oladipo
- Unit for Environmental Sciences and Management, North West University, Potchefstroom, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - Adam F Burt
- Unit for Environmental Sciences and Management, North West University, Potchefstroom, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - Mark S Maboeta
- Unit for Environmental Sciences and Management, North West University, Potchefstroom, Private Bag X6001, Potchefstroom, 2520, South Africa.
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