1
|
Soto-Varela ZE, Orozco-Sánchez CJ, Bolívar-Anillo HJ, Martínez JM, Rodríguez N, Consuegra-Padilla N, Robledo-Meza A, Amils R. Halotolerant Endophytic Bacteria Priestia flexa 7BS3110 with Hg 2+ Tolerance Isolated from Avicennia germinans in a Caribbean Mangrove from Colombia. Microorganisms 2024; 12:1857. [PMID: 39338530 PMCID: PMC11434322 DOI: 10.3390/microorganisms12091857] [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: 04/17/2024] [Revised: 05/29/2024] [Accepted: 05/31/2024] [Indexed: 09/30/2024] Open
Abstract
The mangrove ecosystems of the Department of Atlántico (Colombian Caribbean) are seriously threatened by problems of hypersalinization and contamination, especially by heavy metals from the Magdalena River. The mangrove plants have developed various mechanisms to adapt to these stressful conditions, as well as the associated microbial populations that favor their growth. In the present work, the tolerance and detoxification capacity to heavy metals, especially to mercury, of a halotolerant endophytic bacterium isolated from the species Avicennia germinans located in the Balboa Swamp in the Department of Atlántico was characterized. Diverse microorganisms were isolated from superficially sterilized A. germinans leaves. Tolerance to NaCl was evaluated for each of the obtained isolates, and the most resistant was selected to assess its tolerance to Pb2+, Cu2+, Hg2+, Cr3+, Co2+, Ni2+, Zn2+, and Cd2+, many of which have been detected in high concentrations in the area of study. According to the ANI and AAI percentages, the most halotolerant strain was identified as Priestia flexa, named P. flexa 7BS3110, which was able to tolerate up to 12.5% (w/v) NaCl and presented a minimum inhibitory concentrations (MICs) of 0.25 mM for Hg, 10 mM for Pb, and 15 mM for Cr3+. The annotation of the P. flexa 7BS3110 genome revealed the presence of protein sequences associated with exopolysaccharide (EPS) production, thiol biosynthesis, specific proteins for chrome efflux, non-specific proteins for lead efflux, and processes associated with sulfur and iron homeostasis. Scanning electron microscopy (SEM) analysis showed morphological cellular changes and the transmission electron microscopy (TEM) showed an electrodense extracellular layer when exposed to 0.25 mM Hg2+. Due to the high tolerance of P. flexa 7BS3110 to Hg2+ and NaCl, its ability to grow when exposed to both stressors was tested, and it was able to thrive in the presence of 5% (w/v) NaCl and 0.25 mM of Hg2+. In addition, it was able to remove 98% of Hg2+ from the medium when exposed to a concentration of 14 mg/L of this metalloid. P. flexa 7BS3110 has the potential to bioremediate Hg2+ halophilic contaminated ecosystems.
Collapse
Affiliation(s)
- Zamira E Soto-Varela
- Facultad de Ciencias Básicas y Biomédicas, Centro de Investigación en Biodiversidad y Cambio Climático-ADAPTIA, Universidad Simón Bolívar, Barranquilla 080002, Colombia
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Universidad Autónoma de Madrid, Campus Cantoblanco, 28049 Madrid, Spain
| | - Christian J Orozco-Sánchez
- Facultad de Ciencias Básicas y Biomédicas, Centro de Investigación en Biodiversidad y Cambio Climático-ADAPTIA, Universidad Simón Bolívar, Barranquilla 080002, Colombia
- Institute of Applied Microbiology, Justus-Liebig-University, 35392 Giessen, Germany
| | - Hernando José Bolívar-Anillo
- Facultad de Ciencias Básicas y Biomédicas, Centro de Investigación en Biodiversidad y Cambio Climático-ADAPTIA, Universidad Simón Bolívar, Barranquilla 080002, Colombia
| | - José M Martínez
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Universidad Autónoma de Madrid, Campus Cantoblanco, 28049 Madrid, Spain
| | - Nuria Rodríguez
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Universidad Autónoma de Madrid, Campus Cantoblanco, 28049 Madrid, Spain
- Centro de Astrobiología (INTA-CSIC), Carretera, Ajalvir km 4, 28850 Torrejón de Ardoz, Spain
| | - Natalia Consuegra-Padilla
- Facultad de Ciencias Básicas y Biomédicas, Centro de Investigación en Biodiversidad y Cambio Climático-ADAPTIA, Universidad Simón Bolívar, Barranquilla 080002, Colombia
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Universidad Autónoma de Madrid, Campus Cantoblanco, 28049 Madrid, Spain
| | - Alfredo Robledo-Meza
- Facultad de Ciencias Básicas y Biomédicas, Centro de Investigación en Biodiversidad y Cambio Climático-ADAPTIA, Universidad Simón Bolívar, Barranquilla 080002, Colombia
| | - Ricardo Amils
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Universidad Autónoma de Madrid, Campus Cantoblanco, 28049 Madrid, Spain
- Centro de Astrobiología (INTA-CSIC), Carretera, Ajalvir km 4, 28850 Torrejón de Ardoz, Spain
| |
Collapse
|
2
|
Ma Y, Shi F, Qian S, Ma J. Variations in the dairy wastewater properties and bacterial diversity of each unit in membrane-enclosed anaerobic lagoon treatment process in Heilongjiang Province. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 347:119035. [PMID: 37757687 DOI: 10.1016/j.jenvman.2023.119035] [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: 04/05/2023] [Revised: 08/06/2023] [Accepted: 09/17/2023] [Indexed: 09/29/2023]
Abstract
In order to meet the land use requirements of the treated wastewater from high density polyethylene (HDPE) membrane-enclosed anaerobic lagoons, the physical and chemical properties of the wastewater in an HDPE membrane-enclosed anaerobic lagoon were measured. The total nitrogen content (TN) in wastewater treated in membrane-enclosed anaerobic lagoons is 3165 and 1510 mg/L in winter and summer respectively. The wastewater can be used as liquid organic fertilizer, partly replacing chemical fertilizer. The safety dosage of the wastewater was 21.48 t/ha for rice and 9.54 t/ha for corn, respectively. Meanwhile, the wastewater has the characteristics of high salt (conductivity>16.0 mS/cm) and high organic matter content (COD>16,900 mg/kg). Therefore, the potential negative effects of the wastewater on soil salinity and pH should be assessed. 16S rRNA was used to investigate the bacterial population structure and assess potential biological risks of land use of the wastewater. The wastewater from lagoon has the least and the most bacterial abundance in summer and winter, respectively. The bacterial diversity of wastewater samples from lagoon is the most. 21 and 24 phyla were detected in winter and summer samples respectively. Clostridium is the absolute dominant bacteria in the summer water samples and the absolute dominant bacteria is Trichococcus in winter water samples. Several animal and plant bacterial pathogens such as Campylobacter, Corynebacterium, Facklamia and Erysipelothrix can be detected in the wastewater samples. More than 70% of pathogenic bacteria such as Campylobacter, Facklamia, Erysipelothrix and Acholeplasma can be removed by lagoon in summer, but only about 99% of Corynebacterium is still in the lagoon (XYH). While more than 60% of Corynebacterium, Facklamia and Erysipelothrix are not removed in winter. So the biological risk of land use of anaerobic pond wastewater needs to be considered.
Collapse
Affiliation(s)
- Yuxin Ma
- School of Civil Engineering, Heilongjiang University, Harbin, 150080, PR China; Engineering Research Center of Rural Water Safety of Heilongjiang Province, Heilongjiang University, Harbin, 150080, PR China.
| | - Fengmei Shi
- Heilongjiang Academy of Black Soil Conservation and Utilization, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, PR China
| | - Sheng Qian
- School of Civil Engineering, Heilongjiang University, Harbin, 150080, PR China
| | - Jun Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| |
Collapse
|
3
|
Boudjelal F, Zitouni A, Bouras N, Spröer C, Klenk HP, Smaoui S, Mathieu F. Rare Halophilic Nocardiopsis from Algerian Saharan Soils as Tools for Biotechnological Processes in Pharmaceutical Industry. BIOMED RESEARCH INTERNATIONAL 2023; 2023:1061176. [PMID: 37284028 PMCID: PMC10241594 DOI: 10.1155/2023/1061176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 05/01/2023] [Accepted: 05/15/2023] [Indexed: 06/08/2023]
Abstract
The Sahara Desert, one of the most extreme ecosystems in the planet, constitutes an unexplored source of microorganisms such as mycelial bacteria. In this study, we investigated the diversity of halophilic actinobacteria in soils collected from five regions of the Algerian Sahara. A total of 23 halophilic actinobacterial strains were isolated by using a humic-vitamin agar medium supplemented with 10% NaCl. The isolated halophilic strains were subjected to taxonomic analysis using a polyphasic approach, which included morphological, chemotaxonomic, physiological (numerical taxonomy), and phylogenetic analyses. The isolates showed abundant growth in CMA (complex medium agar) and TSA (tryptic soy agar) media containing 10% NaCl, and chemotaxonomic characteristics were consistent with their assignment to the genus Nocardiopsis. Analysis of the 16S rRNA sequence of 23 isolates showed five distinct clusters and a similarity level ranging between 98.4% and 99.8% within the Nocardiopsis species. Comparison of their physiological characteristics with the nearest species showed significant differences with the closely related species. Halophilic Nocardiopsis isolated from Algerian Sahara soil represents a distinct phyletic line suggesting a potential new species. Furthermore, the isolated strains of halophilic Nocardiopsis were screened for their antagonistic properties against a broad spectrum of microorganisms by the conventional agar method (agar cylinders method) and found to have the capacity to produce bioactive secondary metabolites. Except one isolate (AH37), all isolated Nocardiopsis showed moderate to high biological activities against Pseudomonas syringae and Salmonella enterica, and some isolates showed activities against Agrobacterium tumefaciens, Serratia marcescens, and Klebsiella pneumoniae. However, no isolates were active against Bacillus subtilis, Aspergillus flavus, or Aspergillus niger. The obtained finding implies that the unexplored extreme environments such as the Sahara contain many new bacterial species as a novel drug source for medical and industrial applications.
Collapse
Affiliation(s)
- Farida Boudjelal
- Laboratoire de Biologie des Systèmes Microbiens (LBSM), Ecole Normale Supérieure de Kouba, Algiers, Algeria
- Faculty of Biological Sciences (FSB), University of Sciences and Technologies Houari Boumediene (USTHB), BP 32 El Alia, Bab Ezzouar, 16111 Algiers, Algeria
| | - Abdelghani Zitouni
- Laboratoire de Biologie des Systèmes Microbiens (LBSM), Ecole Normale Supérieure de Kouba, Algiers, Algeria
| | - Noureddine Bouras
- Laboratoire de Biologie des Systèmes Microbiens (LBSM), Ecole Normale Supérieure de Kouba, Algiers, Algeria
- Laboratoire de Valorisation et Conservation des Écosystèmes Arides (LVCEA), Faculté des Sciences de la Nature et de la Vie et Sciences de la Terre, Université de Ghardaia, Ghardaia, Algeria
| | - Cathrin Spröer
- Department Bioinformatics and Databases, Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures GmbH, Brunswick, Germany
| | - Hans-Peter Klenk
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, UK
| | - Slim Smaoui
- Laboratory of Microbial Biotechnology and Engineering Enzymes (LMBEE), Center of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177 3018 Sfax, Tunisia
| | - Florence Mathieu
- Laboratoire de Génie Chimique, UMR 5503 CNRS/INPT/UPS, INP-ENSAT, 1, Université de Toulouse, Avenue de l'Agrobiopôle, 31326 Castanet-Tolosan, France
| |
Collapse
|
4
|
Brachybacterium kimchii sp. nov. and Brachybacterium halotolerans subsp. kimchii subsp. nov., isolated from the Korean fermented vegetables, kimchi, and description of Brachybacterium halotolerans subsp. halotolerans subsp. nov. J Microbiol 2022; 60:678-688. [DOI: 10.1007/s12275-022-1581-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 05/19/2022] [Accepted: 05/24/2022] [Indexed: 11/27/2022]
|
5
|
Oren A, Garrity GM. Valid publication of new names and new combinations effectively published outside the IJSEM. Int J Syst Evol Microbiol 2021; 71. [PMID: 34850678 DOI: 10.1099/ijsem.0.005096] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- Aharon Oren
- The Institute of Life Sciences, The Hebrew University of Jerusalem, The Edmond J. Safra Campus, 9190401 Jerusalem, Israel
| | - George M Garrity
- Department of Microbiology & Molecular Genetics, Biomedical Physical Sciences, Michigan State University, East Lansing, MI 48824-4320, USA
| |
Collapse
|
6
|
Zani RDOA, Ferro M, Bacci M. Three phylogenetically distinct and culturable diazotrophs are perennial symbionts of leaf-cutting ants. Ecol Evol 2021; 11:17686-17699. [PMID: 35003632 PMCID: PMC8717316 DOI: 10.1002/ece3.8213] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 09/06/2021] [Accepted: 09/21/2021] [Indexed: 02/04/2023] Open
Abstract
The obligate mutualistic basidiomycete fungus, Leucocoprinus gongylophorus, mediates nutrition of leaf-cutting ants with carbons from vegetal matter. In addition, diazotrophic Enterobacteriales in the fungus garden and intestinal Rhizobiales supposedly mediate assimilation of atmospheric nitrogen, and Entomoplasmatales in the genus Mesoplasma, as well as other yet unidentified strains, supposedly mediate ant assimilation of other compounds from vegetal matter, such as citrate, fructose, and amino acids. Together, these nutritional partners would support the production of high yields of leafcutter biomass. In the present investigation, we propose that three phylogenetically distinct and culturable diazotrophs in the genera Ralstonia, Methylobacterium, and Pseudomonas integrate this symbiotic nutrition network, facilitating ant nutrition on nitrogen. Strains in these genera were often isolated and directly sequenced in 16S rRNA libraries from the ant abdomen, together with the nondiazotrophs Acinetobacter and Brachybacterium. These five isolates were underrepresented in libraries, suggesting that none of them is dominant in vivo. Libraries have been dominated by four uncultured Rhizobiales strains in the genera Liberibacter, Terasakiella, and Bartonella and, only in Acromyrmex ants, by the Entomoplasmatales in the genus Mesoplasma. Acromyrmex also presented small amounts of two other uncultured Entomoplasmatales strains, Entomoplasma and Spiroplasma. The absence of Entomoplasmatales in Atta workers implicates that the association with these bacteria is not mandatory for ant biomass production. Most of the strains that we detected in South American ants were genetically similar with strains previously described in association with leafcutters from Central and North America, indicating wide geographic dispersion, and suggesting fixed ecological services.
Collapse
Affiliation(s)
| | - Milene Ferro
- Centro de Estudos de Insetos Sociais (CEIS)Universidade Estadual Paulista (UNESP)Rio Claro ‐ SPBrazil
| | - Maurício Bacci
- Centro de Estudos de Insetos Sociais (CEIS)Universidade Estadual Paulista (UNESP)Rio Claro ‐ SPBrazil
- Departamento de Biologia Geral e AplicadaUniversidade Estadual Paulista (UNESP)Rio Claro ‐ SPBrazil
| |
Collapse
|