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Amara Y, Mahjoubi M, Souissi Y, Cherif H, Naili I, ElHidri D, Kadidi I, Mosbah A, Masmoudi AS, Cherif A. Tapping into haloalkaliphilic bacteria for sustainable agriculture in treated wastewater: insights into genomic fitness and environmental adaptation. Antonie Van Leeuwenhoek 2024; 118:1. [PMID: 39269515 DOI: 10.1007/s10482-024-02012-5] [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: 02/08/2024] [Accepted: 08/16/2024] [Indexed: 09/15/2024]
Abstract
The increasing salinity and alkalinity of soils pose a global challenge, particularly in arid regions such as Tunisia, where about 50% of lands are sensitive to soil salinization. Anthropogenic activities, including the use of treated wastewater (TWW) for irrigation, exacerbate these issues. Haloalkaliphilic bacteria, adapted to TWW conditions and exhibiting plant-growth promotion (PGP) and biocontrol traits, could offer solutions. In this study, 24 haloalkaliphilic bacterial strains were isolated from rhizosphere sample of olive tree irrigated with TWW for more than 20 years. The bacterial identification using 16S rRNA gene sequencing showed that the haloalkaliphilic isolates, capable of thriving in high salinity and alkaline pH, were primarily affiliated to Bacillota (Oceanobacillus and Staphylococcus). Notably, these strains exhibited biofertilization and enzyme production under both normal and saline conditions. Traits such as phosphate solubilization, and the production of exopolysaccharide, siderophore, ammonia, and hydrogen cyanide were observed. The strains also demonstrated enzymatic activities, including protease, amylase, and esterase. Four selected haloalkaliphilic PGPR strains displayed antifungal activity against Alternaria terricola, with three showing tolerances to heavy metals and pesticides. The strain Oceanobacillus picturea M4W.A2 was selected for genome sequencing. Phylogenomic analyses indicated that the extreme environmental conditions probably influenced the development of specific adaptations in M4W.A2 strain, differentiating it from other Oceanobacillus picturae strains. The presence of the key genes associated with plant growth promotion, osmotic and oxidative stress tolerance, antibiotic and heavy metals resistance hinted the functional capabilities might help the strain M4W.A2 to thrive in TWW-irrigated soils. By demonstrating this connection, we aim to improve our understanding of genomic fitness to stressed environments. Moreover, the identification of gene duplication and horizontal gene transfer events through mobile genetic elements allow the comprehension of these adaptation dynamics. This study reveals that haloalkaliphilc bacteria from TWW-irrigated rhizosphere exhibit plant-growth promotion and biocontrol traits, with genomic adaptations enabling their survival in high salinity and alkaline conditions, offering potential solutions for soil salinization issues.
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Affiliation(s)
- Yosra Amara
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia
- National Agronomy Institute of Tunisia, Avenue Charles Nicolle, 1082, Tunis, Mahrajène, Tunisia
| | - Mouna Mahjoubi
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia
| | - Yasmine Souissi
- Department of Engineering, German University of Technology in Oman, P.O. Box 1816, 130, Muscat, Oman
| | - Hanene Cherif
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia
| | - Islem Naili
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia
| | - Darine ElHidri
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia
| | - Imen Kadidi
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia
| | - Amor Mosbah
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia
| | - Ahmed S Masmoudi
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia
| | - Ameur Cherif
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia.
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Belkin P, Nechaeva Y, Blinov S, Vaganov S, Perevoshchikov R, Plotnikova E. Sediment microbial communities of a technogenic saline-alkaline reservoir. Heliyon 2024; 10:e33640. [PMID: 39071596 PMCID: PMC11283119 DOI: 10.1016/j.heliyon.2024.e33640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 06/14/2024] [Accepted: 06/25/2024] [Indexed: 07/30/2024] Open
Abstract
Various natural saline and alkaline habitats have recently been widely investigated, but knowledge of anthropogenic habitats with more complex environmental conditions is still lacking. This research looks at the structure of microbial communities in 18 bottom sediment samples from a technogenic water body with saline and alkaline composition. The core samples were collected from 2 columns in the western and eastern parts of an artificial water body at the Verkhnekamskoe Salt Deposit (Russia). The microbial community structure was studied using high-throughput 16S rRNA gene sequencing. The bottom sediment composition (salinity, pH, and toxic element content) varies greatly with depth and laterally throughout the study area. The study found a considerable difference in bacterial community diversity between the 2 columns, but no considerable difference was found between the communities at various depths of the studied layers. Proteobacteria, Firmicutes, and Actinobacteria, which are common in both natural and artificial saline and alkaline environments, make up the majority of the bacteria found in the samples. Studies have shown that salinity and total alkalinity are the key factors influencing the formation of microbial communities. Ralstonia and Pseudomonas were the two most common genera in the sediment samples. These two genera are known for having high metabolic flexibility, which means they can survive in extreme environments and use a variety of carbon compounds as energy sources. The study also found that Ralstonia is indicator bacteria in samples with the highest concentrations of toxic elements compared to the other samples. A relatively high microbial diversity was discovered in the studied anthropogenic water reservoir despite the extreme alkaline and saline conditions, but it is considerably lower than that found in natural, less alkaline habitats. This research offers insight into the mechanisms behind microbial community formation in complex anthropogenic environments and covers key factors in microbial community distribution.
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Affiliation(s)
- Pavel Belkin
- Natural Science Institute, Perm State University, 614068, Bukireva st. 15, Perm, Russia
| | - Yulia Nechaeva
- Institute of Ecology and Genetics of Microorganisms, Ural Branch of the Russian Аcademy of Sciences, 614081, Goleva st. 13, Perm, Russia
| | - Sergey Blinov
- Natural Science Institute, Perm State University, 614068, Bukireva st. 15, Perm, Russia
| | - Sergey Vaganov
- Natural Science Institute, Perm State University, 614068, Bukireva st. 15, Perm, Russia
| | - Roman Perevoshchikov
- Natural Science Institute, Perm State University, 614068, Bukireva st. 15, Perm, Russia
| | - Elena Plotnikova
- Institute of Ecology and Genetics of Microorganisms, Ural Branch of the Russian Аcademy of Sciences, 614081, Goleva st. 13, Perm, Russia
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Guerra-Camacho MÁ, Magaña-Tzuc MC, Vargas-Díaz AA, Silva-Rojas HV, Gamboa-Angulo M. [Identification and antifungal activity of halophilic bacteria isolated from saline soils in Campeche, México]. Rev Argent Microbiol 2024; 56:298-311. [PMID: 38614909 DOI: 10.1016/j.ram.2024.02.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 11/05/2023] [Accepted: 02/03/2024] [Indexed: 04/15/2024] Open
Abstract
Phytopathogenic fungi Alternaria alternata and Colletotrichum gloeosporioides cause diseases in plant tissues as well as significant postharvest losses. The use of chemical fungicides for their control has negative effects on health and the environment. Secondary metabolites from halophilic bacteria are a promising alternative for new antifungal compounds. In the present study, halophilic bacteria were isolated and characterized from two sites with saline soils called branquizales in Campeche, Mexico. A total of 64 bacteria were isolated. Agrobacterium, Bacillus, Inquilinus, Gracilibacillus, Metabacillus, Neobacillus, Paenibacillus, Priestia, Staphylococcus, Streptomyces and Virgibacillus were among the identified genera. The antifungal potential of the culture supernatant (CS) of 39 halophilic bacteria was investigated against C. gloeosporioides and A. alternata. The bacteria showing the greatest inhibition of mycelial growth corresponded to Bacillus subtilis CPO 4292, Metabacillus sp. CPO 4266, Bacillus sp. CPO 4295 and Bacillus sp. CPO 4279. The CS of Bacillus sp. CPO 4279 exhibited the highest activity and its ethyl acetate extract (AcOEt) inhibited the germination of C. gloeosporioides, with IC50 values of 8,630μg/ml and IC90 of 10,720μg/ml. The organic partition of the AcOEt extract led to three fractions, with acetonitrile (FAcB9) showing the highest antifungal activity, with values exceeding 66%. Halophilic bacteria from 'blanquizales' soils of the genus Bacillus sp. produce metabolites with antifungal properties that inhibit the phytopathogenic fungus C. gloeosporioides.
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Affiliation(s)
| | | | - Arely A Vargas-Díaz
- CONAHCYT-Colegio de Postgraduados, Champotón, Campus Campeche, Campeche, México.
| | - Hilda V Silva-Rojas
- Colegio de Postgraduados, Posgrado en Producción de Semillas, Campus Montecillo, Texcoco, Estado de México, México
| | - Marcela Gamboa-Angulo
- Unidad de Biotecnología, Centro de Investigación Científica de Yucatán, A.C., Mérida, Yucatán, México
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Arthi R, Parameswari E, Dhevagi P, Janaki P, Parimaladevi R. Microbial alchemists: unveiling the hidden potentials of halophilic organisms for soil restoration. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024:10.1007/s11356-024-33949-9. [PMID: 38877191 DOI: 10.1007/s11356-024-33949-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Accepted: 06/05/2024] [Indexed: 06/16/2024]
Abstract
Salinity, resulting from various contaminants, is a major concern to global crop cultivation. Soil salinity results in increased osmotic stress, oxidative stress, specific ion toxicity, nutrient deficiency in plants, groundwater contamination, and negative impacts on biogeochemical cycles. Leaching, the prevailing remediation method, is expensive, energy-intensive, demands more fresh water, and also causes nutrient loss which leads to infertile cropland and eutrophication of water bodies. Moreover, in soils co-contaminated with persistent organic pollutants, heavy metals, and textile dyes, leaching techniques may not be effective. It promotes the adoption of microbial remediation as an effective and eco-friendly method. Common microbes such as Pseudomonas, Trichoderma, and Bacillus often struggle to survive in high-saline conditions due to osmotic stress, ion imbalance, and protein denaturation. Halophiles, capable of withstanding high-saline conditions, exhibit a remarkable ability to utilize a broad spectrum of organic pollutants as carbon sources and restore the polluted environment. Furthermore, halophiles can enhance plant growth under stress conditions and produce vital bio-enzymes. Halophilic microorganisms can contribute to increasing soil microbial diversity, pollutant degradation, stabilizing soil structure, participating in nutrient dynamics, bio-geochemical cycles, enhancing soil fertility, and crop growth. This review provides an in-depth analysis of pollutant degradation, salt-tolerating mechanisms, and plant-soil-microbe interaction and offers a holistic perspective on their potential for soil restoration.
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Affiliation(s)
- Ravichandran Arthi
- Department of Environmental Science, Tamil Nadu Agricultural University, Coimbatore, India
| | | | - Periyasamy Dhevagi
- Department of Environmental Science, Tamil Nadu Agricultural University, Coimbatore, India
| | - Ponnusamy Janaki
- Nammazhvar Organic Farming Research Centre, Tamil Nadu Agricultural University, Coimbatore, India
| | - Rathinasamy Parimaladevi
- Department of Bioenergy, Agrl. Engineering College & Research Institute, Tamil Nadu Agricultural University, Coimbatore, India
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Aizaz M, Lubna, Ahmad W, Khan I, Asaf S, Bilal S, Jan R, Asif S, Waqas M, Khan AL, Kim KM, AL-Harrasi A. Exploring the potential of halotolerant bacteria from coastal regions to mitigate salinity stress in wheat: physiological, molecular, and biochemical insights. FRONTIERS IN PLANT SCIENCE 2023; 14:1224731. [PMID: 37810397 PMCID: PMC10556533 DOI: 10.3389/fpls.2023.1224731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 09/04/2023] [Indexed: 10/10/2023]
Abstract
Salinity stress, a significant global abiotic stress, is caused by various factors such as irrigation with saline water, fertilizer overuse, and drought conditions, resulting in reduced agricultural production and sustainability. In this study, we investigated the use of halotolerant bacteria from coastal regions characterized by high salinity as a solution to address the major environmental challenge of salinity stress. To identify effective microbial strains, we isolated and characterized 81 halophilic bacteria from various sources, such as plants, rhizosphere, algae, lichen, sea sediments, and sea water. We screened these bacterial strains for their plant growth-promoting activities, such as indole acetic acid (IAA), phosphate solubilization, and siderophore production. Similarly, the evaluation of bacterial isolates through bioassay revealed that approximately 22% of the endophytic isolates and 14% of rhizospheric isolates exhibited a favorable influence on seed germination and seedling growth. Among the tested isolates, GREB3, GRRB3, and SPSB2 displayed a significant improvement in all growth parameters compared to the control. As a result, these three isolates were utilized to evaluate their efficacy in alleviating the negative impacts of salt stress (150 mM, 300 mM, and seawater (SW)) on the growth of wheat plants. The result showed that shoot length significantly increased in plants inoculated with bacterial isolates up to 15% (GREB3), 16% (GRRB3), and 24% (SPSB2), respectively, compared to the control. The SPSB2 strain was particularly effective in promoting plant growth and alleviating salt stress. All the isolates exhibited a more promotory effect on root length than shoot length. Under salt stress conditions, the GRRB3 strain significantly impacted root length, leading to a boost of up to 6%, 5%, and 3.8% at 150 mM, 300 mM, and seawater stress levels, respectively. The bacterial isolates also positively impacted the plant's secondary metabolites and antioxidant enzymes. The study also identified the WDREB2 gene as highly upregulated under salt stress, whereas DREB6 was downregulated. These findings demonstrate the potential of beneficial microbes as a sustainable approach to mitigate salinity stress in agriculture.
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Affiliation(s)
- Muhammad Aizaz
- Natural and Medical Science Research Center, University of Nizwa, Nizwa, Oman
| | - Lubna
- Natural and Medical Science Research Center, University of Nizwa, Nizwa, Oman
| | - Waqar Ahmad
- Department of Engineering Technology, University of Houston, Sugar Land, TX, United States
| | - Ibrahim Khan
- Natural and Medical Science Research Center, University of Nizwa, Nizwa, Oman
| | - Sajjad Asaf
- Natural and Medical Science Research Center, University of Nizwa, Nizwa, Oman
| | - Saqib Bilal
- Natural and Medical Science Research Center, University of Nizwa, Nizwa, Oman
| | - Rahmatullah Jan
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Saleem Asif
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Muhammad Waqas
- Department of Agriculture Extension, Government of Khyber Pakhtunkhwa, Mardan, Pakistan
| | - Abdul Latif Khan
- Department of Engineering Technology, University of Houston, Sugar Land, TX, United States
| | - Kyung-Min Kim
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Ahmed AL-Harrasi
- Natural and Medical Science Research Center, University of Nizwa, Nizwa, Oman
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Rincón-Rosales R, Rogel MA, Rincón-Molina CI, Guerrero G, Manzano-Gómez LA, López-López A, Rincón Molina FA, Martínez-Romero E. Complete genome sequence of Exiguobacterium profundum TSS-3 isolated from an extremely saline-alkaline spring located in Ixtapa, Chiapas-México. Microbiol Resour Announc 2023; 12:e0017123. [PMID: 37606375 PMCID: PMC10508092 DOI: 10.1128/mra.00171-23] [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: 03/10/2023] [Accepted: 07/14/2023] [Indexed: 08/23/2023] Open
Abstract
We report the complete genome sequence of Exiguobacterium profundum TSS-3, a strain isolated from the sediment of an extremely saline-alkaline spring located in Ixtapa, Chiapas-México (16° 47´ LN and 92° 54´ LO). Its genome is composed of a 2.8-Mb chromosome and a small 4.6-Kb plasmid.
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Affiliation(s)
- Reiner Rincón-Rosales
- Departamento de Ingeniería Química y Bioquímica, Tecnológico Nacional de México / Instituto Tecnológico de Tuxtla Gutiérrez, Tuxtla Gutiérrez, Chiapas, Mexico
| | - Marco A. Rogel
- Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico
| | - Clara Ivette Rincón-Molina
- Departamento de Ingeniería Química y Bioquímica, Tecnológico Nacional de México / Instituto Tecnológico de Tuxtla Gutiérrez, Tuxtla Gutiérrez, Chiapas, Mexico
| | - Gabriela Guerrero
- Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico
| | | | - Aline López-López
- Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico
| | - Francisco A. Rincón Molina
- Departamento de Ingeniería Química y Bioquímica, Tecnológico Nacional de México / Instituto Tecnológico de Tuxtla Gutiérrez, Tuxtla Gutiérrez, Chiapas, Mexico
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Cisneros-Martínez AM, Eguiarte LE, Souza V. Metagenomic comparisons reveal a highly diverse and unique viral community in a seasonally fluctuating hypersaline microbial mat. Microb Genom 2023; 9:mgen001063. [PMID: 37459167 PMCID: PMC10438804 DOI: 10.1099/mgen.0.001063] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Accepted: 06/15/2023] [Indexed: 07/20/2023] Open
Abstract
In spring 2016, a shallow hypersaline pond (50×25 m) was found in the Cuatro Cienegas Basin (CCB). This pond, known as Archaean Domes (AD) because of its elastic microbial mats that form dome-shaped structures due to the production of reducing gases reminiscent of the Archaean eon, such as methane and hydrogen sulfide, harbour a highly diverse microbial community, rich in halophilic and methanogenic archaea. AD is a seasonally fluctuating hypersaline site, with salinity ranging from low hypersaline (5.3%) during the wet season to high hypersaline (saturation) during the dry season. To characterize the viral community and to test whether it resembles those of other hypersaline sites (whose diversity is conditioned by salinity), or if it is similar to other CCB sites (with which it shares a common geological history), we generated 12 metagenomes from different seasons and depths over a 4 year period and compared them to 35 metagenomes from varied environments. Haloarchaeaviruses were detected, but were never dominant (average of 15.37 % of the total viral species), and the viral community structure and diversity were not affected by environmental fluctuations. In fact, unlike other viral communities at hypersaline sites, AD remained more diverse than other environments regardless of season. β-Diversity analyses show that AD is closely related to other CCB sites, although it has a unique viral community that forms a cluster of its own. The similarity of two surface samples to the 30 and 50 cm depth samples, as well as the observed increase in diversity at greater depths, supports the hypothesis that the diversity of CCB has evolved as a result of a long time environmental stability of a deep aquifer that functions as a 'seed bank' of great microbial diversity that is transported to the surface by sporadic groundwater upwelling events.
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Affiliation(s)
- Alejandro Miguel Cisneros-Martínez
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad de México, México
- Doctorado en Ciencias Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México, México
| | - Luis E. Eguiarte
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad de México, México
| | - Valeria Souza
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad de México, México
- Centro de Estudios del Cuaternario de Fuego-Patagonia y Antártica (CEQUA), Punta Arenas, Chile
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Lach J, Królikowska K, Baranowska M, Krupińska M, Strapagiel D, Matera-Witkiewicz A, Stączek P. A first insight into the Polish Bochnia Salt Mine metagenome. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:49551-49566. [PMID: 36780083 PMCID: PMC10104926 DOI: 10.1007/s11356-023-25770-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Accepted: 02/02/2023] [Indexed: 02/14/2023]
Abstract
The Bochnia Salt Mine is one of the oldest mines in Europe. It was established in the thirteenth century, and actively operated until 1990. The mine has been placed on the UNESCO World Heritage List. Previous research describing Polish salt mines has been focused on bioaerosol characteristics and the identification of microorganisms potentially important for human health. The use of Polish salt mines as inhalation chambers for patients of health resorts has also been investigated. Nevertheless, the biodiversity of salt mines associated with biotechnological potential has not been well characterized. The present study paper examines the biodiversity of microorganisms in the Bochnia Salt Mine based on 16S rRNA gene and shotgun sequencing. Biodiversity studies revealed a significantly higher relative abundance of Chlamydiae at the first level of the mine (3.5%) compared to the other levels (< 0.1%). Patescibacteria microorganisms constituted a high percentage (21.6%) in the sample from site RA6. Shotgun sequencing identified 16 unique metagenome-assembled genomes (MAGs). Although one was identified as Halobacterium bonnevillei, the others have not yet been assigned to any species; it is possible that these species may be undescribed. Preliminary analyses of the biotechnological and pharmaceutical potential of microorganisms inhabiting the mine were also performed, and the biosynthetic gene cluster (BGC) profiles and antimicrobial peptide (AMP) coding genes in individual samples were characterized. Hundreds of BGCs and dozens of AMP coding genes were identified in metagenomes. Our findings indicate that Polish salt mines are promising sites for further research aimed at identifying microorganisms that are producers of potentially important substances with biotechnological and pharmaceutical applications.
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Affiliation(s)
- Jakub Lach
- Department of Molecular Microbiology, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland.
- Biobank Lab, Department of Oncobiology and Epigenetics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland.
| | - Klaudyna Królikowska
- Biobank Lab, Department of Oncobiology and Epigenetics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
- Department of Invertebrate Zoology and Hydrobiology, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - Monika Baranowska
- Biobank Lab, Department of Oncobiology and Epigenetics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
- Department of Invertebrate Zoology and Hydrobiology, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - Magdalena Krupińska
- Screening of Biological Activity Assays and Collection of Biological Material Laboratory, Faculty of Pharmacy, Wroclaw Medical University Biobank, Wroclaw Medical University, Wroclaw, Poland
| | - Dominik Strapagiel
- Biobank Lab, Department of Oncobiology and Epigenetics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - Agnieszka Matera-Witkiewicz
- Screening of Biological Activity Assays and Collection of Biological Material Laboratory, Faculty of Pharmacy, Wroclaw Medical University Biobank, Wroclaw Medical University, Wroclaw, Poland
| | - Paweł Stączek
- Department of Molecular Microbiology, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
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Mulugeta K, Kamaraj M, Tafesse M, Kebede G, Gemechu G, Chandran M. Biomolecules from Serratia sp. CS1 indigenous to Ethiopian natural alkaline lakes: biosurfactant characteristics and assessment of compatibility in a laundry detergent. ENVIRONMENTAL MONITORING AND ASSESSMENT 2022; 194:873. [PMID: 36227369 DOI: 10.1007/s10661-022-10533-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 06/18/2022] [Indexed: 06/16/2023]
Abstract
In this study, the biosurfactants (Bio-SFs) producing bacteria are screened from the selected alkaline lake of Ethiopia, and the potential bacterial strain and their produced Bio-SFs are further characterized. In an initial screening, 25 bacterial isolates were isolated, and among those, the bacterial isolate assigned as CS1 was identified as the most potent producer of Bio-SFs using a subsequent characterization process. The CS1 strain was identified as Serratia sp. via biochemical and molecular methods. An emulsion index (E24) of 69.06 ± 0.11% was obtained for CS1 after 5 days of incubation time at 30 °C. The CS1-extracted Bio-SFs were characterized by Fourier transform infrared (FTIR), and it indicated that the type of biosurfactant produced was a glycolipid. The stability of the crude Bio-SFs was characterized, and the optimal conditions were found to be 80 °C, pH 8, and 3% NaCl, respectively. The extracted Bio-SFs were compatible with tested commercial detergents, and its efficiency increased from 12.2 ± 0.1% to 67.1 ± 0.17% and 70.43 ± 0.11% when combined with commercially available detergent brands in Ethiopia such as Taza and Largo, respectively. This study suggests that the isolated S. marcescens CS1 strain has the potential to produce Bio-SFs that are viable competence to replace the use of synthetic chemicals in the production of commercial detergents.
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Affiliation(s)
- Kidist Mulugeta
- Bioprocess and Biotechnology Center of Excellence, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
- Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
| | - Murugesan Kamaraj
- Department of Biotechnology, Faculty of Science and Humanities, SRM Institute of Science and Technology - Ramapuram Campus, Chennai, 600089, Tamil Nadu, India.
| | - Mesfin Tafesse
- Bioprocess and Biotechnology Center of Excellence, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
- Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
| | - Gessesse Kebede
- Bioprocess and Biotechnology Center of Excellence, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
- Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
| | - Getachew Gemechu
- Bioprocess and Biotechnology Center of Excellence, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
- Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
| | - Masi Chandran
- Bioprocess and Biotechnology Center of Excellence, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
- Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
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10
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Kohler TJ, Fodelianakis S, Michoud G, Ezzat L, Bourquin M, Peter H, Busi SB, Pramateftaki P, Deluigi N, Styllas M, Tolosano M, de Staercke V, Schön M, Brandani J, Marasco R, Daffonchio D, Wilmes P, Battin TJ. Glacier shrinkage will accelerate downstream decomposition of organic matter and alters microbiome structure and function. GLOBAL CHANGE BIOLOGY 2022; 28:3846-3859. [PMID: 35320603 PMCID: PMC9323552 DOI: 10.1111/gcb.16169] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 03/06/2022] [Indexed: 05/22/2023]
Abstract
The shrinking of glaciers is among the most iconic consequences of climate change. Despite this, the downstream consequences for ecosystem processes and related microbiome structure and function remain poorly understood. Here, using a space-for-time substitution approach across 101 glacier-fed streams (GFSs) from six major regions worldwide, we investigated how glacier shrinkage is likely to impact the organic matter (OM) decomposition rates of benthic biofilms. To do this, we measured the activities of five common extracellular enzymes and estimated decomposition rates by using enzyme allocation equations based on stoichiometry. We found decomposition rates to average 0.0129 (% d-1 ), and that decreases in glacier influence (estimated by percent glacier catchment coverage, turbidity, and a glacier index) accelerates decomposition rates. To explore mechanisms behind these relationships, we further compared decomposition rates with biofilm and stream water characteristics. We found that chlorophyll-a, temperature, and stream water N:P together explained 61% of the variability in decomposition. Algal biomass, which is also increasing with glacier shrinkage, showed a particularly strong relationship with decomposition, likely indicating their importance in contributing labile organic compounds to these carbon-poor habitats. We also found high relative abundances of chytrid fungi in GFS sediments, which putatively parasitize these algae, promoting decomposition through a fungal shunt. Exploring the biofilm microbiome, we then sought to identify bacterial phylogenetic clades significantly associated with decomposition, and found numerous positively (e.g., Saprospiraceae) and negatively (e.g., Nitrospira) related clades. Lastly, using metagenomics, we found evidence of different bacterial classes possessing different proportions of EEA-encoding genes, potentially informing some of the microbial associations with decomposition rates. Our results, therefore, present new mechanistic insights into OM decomposition in GFSs by demonstrating that an algal-based "green food web" is likely to increase in importance in the future and will promote important biogeochemical shifts in these streams as glaciers vanish.
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Affiliation(s)
- Tyler J. Kohler
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Stilianos Fodelianakis
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Grégoire Michoud
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Leïla Ezzat
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Massimo Bourquin
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Hannes Peter
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Susheel Bhanu Busi
- Systems Ecology Research GroupLuxembourg Centre for Systems BiomedicineUniversity of LuxembourgEsch‐sur‐AlzetteLuxembourg
| | - Paraskevi Pramateftaki
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Nicola Deluigi
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Michail Styllas
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Matteo Tolosano
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Vincent de Staercke
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Martina Schön
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Jade Brandani
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Ramona Marasco
- Biological and Environmental Sciences and Engineering Division (BESE)King Abdullah University of Science and Technology (KAUST)ThuwalSaudi Arabia
| | - Daniele Daffonchio
- Biological and Environmental Sciences and Engineering Division (BESE)King Abdullah University of Science and Technology (KAUST)ThuwalSaudi Arabia
| | - Paul Wilmes
- Systems Ecology Research GroupLuxembourg Centre for Systems BiomedicineUniversity of LuxembourgEsch‐sur‐AlzetteLuxembourg
| | - Tom J. Battin
- River Ecosystems Laboratory, Alpine and Polar Environmental Research Center, Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
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11
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Márquez-Villa JM, Mateos-Díaz JC, Rodríguez-González JA, Camacho-Ruíz RM. Optimization of Lipopeptide Biosurfactant Production by Salibacterium sp. 4CTb in Batch Stirred-Tank Bioreactors. Microorganisms 2022; 10:983. [PMID: 35630427 PMCID: PMC9145298 DOI: 10.3390/microorganisms10050983] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 04/25/2022] [Accepted: 04/30/2022] [Indexed: 02/05/2023] Open
Abstract
Halophilic microorganisms are potentially capable as platforms to produce low-cost biosurfactants. However, the robustness of bioprocesses is still a challenge and, therefore, it is essential to understand the effects of microbiological culture conditions through bioreactor engineering. Based on a design of experiments (DOE) and a response surface methodology (RSM) tailored and taken from the literature, the present work focuses on the evaluation of a composite central design (CCD) under batch cultures in stirred-tank bioreactors with the halophilic bacteria Salibacterium sp. 4CTb in order to determine the operative conditions that favor mass transfer and optimize the production of a lipopeptide. The results obtained showed profiles highlighting the most favorable culture conditions, which lead to an emulsification index (E24%) higher than 70%. Moreover, through the behavior of dissolved oxygen (DO), it was possible to experimentally evaluate the higher volumetric coefficient of mass transfer in the presence of lipopeptide (kLa = 31 1/h) as a key criterion for the synthesis of the biosurfactant on further cell expansion.
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Affiliation(s)
| | | | | | - Rosa María Camacho-Ruíz
- Department of Industrial Biotechnology, CIATEJ-CONACyT, Zapopan 45019, Mexico; (J.M.M.-V.); (J.C.M.-D.); (J.A.R.-G.)
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12
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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: 10] [Impact Index Per Article: 5.0] [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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13
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Lach J, Jęcz P, Strapagiel D, Matera-Witkiewicz A, Stączek P. The Methods of Digging for "Gold" within the Salt: Characterization of Halophilic Prokaryotes and Identification of Their Valuable Biological Products Using Sequencing and Genome Mining Tools. Genes (Basel) 2021; 12:1756. [PMID: 34828362 PMCID: PMC8619533 DOI: 10.3390/genes12111756] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 10/18/2021] [Accepted: 10/30/2021] [Indexed: 02/06/2023] Open
Abstract
Halophiles, the salt-loving organisms, have been investigated for at least a hundred years. They are found in all three domains of life, namely Archaea, Bacteria, and Eukarya, and occur in saline and hypersaline environments worldwide. They are already a valuable source of various biomolecules for biotechnological, pharmaceutical, cosmetological and industrial applications. In the present era of multidrug-resistant bacteria, cancer expansion, and extreme environmental pollution, the demand for new, effective compounds is higher and more urgent than ever before. Thus, the unique metabolism of halophilic microorganisms, their low nutritional requirements and their ability to adapt to harsh conditions (high salinity, high pressure and UV radiation, low oxygen concentration, hydrophobic conditions, extreme temperatures and pH, toxic compounds and heavy metals) make them promising candidates as a fruitful source of bioactive compounds. The main aim of this review is to highlight the nucleic acid sequencing experimental strategies used in halophile studies in concert with the presentation of recent examples of bioproducts and functions discovered in silico in the halophile's genomes. We point out methodological gaps and solutions based on in silico methods that are helpful in the identification of valuable bioproducts synthesized by halophiles. We also show the potential of an increasing number of publicly available genomic and metagenomic data for halophilic organisms that can be analysed to identify such new bioproducts and their producers.
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Affiliation(s)
- Jakub Lach
- Department of Molecular Microbiology, Faculty of Biology and Environmental Protection, University of Lodz, 93-338 Lodz, Poland; (P.J.); (P.S.)
- Biobank Lab, Department of Molecular Biophysics, Faculty of Environmental Protection, University of Lodz, 93-338 Lodz, Poland;
| | - Paulina Jęcz
- Department of Molecular Microbiology, Faculty of Biology and Environmental Protection, University of Lodz, 93-338 Lodz, Poland; (P.J.); (P.S.)
| | - Dominik Strapagiel
- Biobank Lab, Department of Molecular Biophysics, Faculty of Environmental Protection, University of Lodz, 93-338 Lodz, Poland;
| | - Agnieszka Matera-Witkiewicz
- Screening Laboratory of Biological Activity Tests and Collection of Biological Material, Faculty of Pharmacy, Wroclaw Medical University, 50-368 Wroclaw, Poland;
| | - Paweł Stączek
- Department of Molecular Microbiology, Faculty of Biology and Environmental Protection, University of Lodz, 93-338 Lodz, Poland; (P.J.); (P.S.)
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14
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Mining Saline Soils to Manifest Plant Stress-Alleviating Halophilic Bacteria. Curr Microbiol 2020; 77:2265-2278. [PMID: 32468180 DOI: 10.1007/s00284-020-02028-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 05/13/2020] [Indexed: 10/24/2022]
Abstract
The connection between soil and microbes plays a critical role in soil health and quality and can be elastic with the application of soil amendments and/or crop rotations. Inappropriate management of soil and application of impermissible levels of fertilizers ruptures the overriding connection between the soil and microbes. This is currently evidenced in the degraded soils (i.e., saline soils of India) which are caused by modern agricultural practices. Reclamation of saline soils with a saturated package of practices and conventional breeding methods requires biological intervention. Shortfall of nutrients is one of the chief constraints for plant growth in salt-affected soils. In the present investigation, we have observed an arsenal of fifty halophilic bacteria carrying an absolute requirement of 3% NaCl for solubilizing the insoluble minerals (ZnCO3, ZnO, Mica and tri-calcium phosphate) under in vitro conditions; however, increasing the amount of NaCl over and above resulted in loss of solubilization capacity. Of the isolates solubilizing zinc carbonate and zinc oxide at 3% NaCl concentration, there were 29 isolates; at 10% concentration, 10 isolates were positive for the presence of zinc carbonate. At 3% NaCl concentration, HB-5 showed 23.16 mm zinc carbonate solubilization, HB-20 showed 13.3 mm Zinc oxide solubilization, and HB-7 showed 13.4 mm tri-calcium phosphate solubilization. Mica solubilization was peaked at 6% NaCl and maximum solubilization was observed in HB-27 (18.03 mm). When compared to the zinc carbonate solubilization, zinc oxide solubilization was slow to reach desired levels. Solubilization lasted for up to 9 days and ceased thereafter in all the tests. Eight elite isolates were identified as Bacillus albus, Bacillus safensis, Pseudomonas stutzeri (2), Lysinibacillus sphaericus, Staphylococcus xylosus, and Bacillus cereus (2) based on 16S rRNA analysis.
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15
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Dixit VK, Misra S, Mishra SK, Tewari SK, Joshi N, Chauhan PS. Characterization of plant growth-promoting alkalotolerant Alcaligenes and Bacillus strains for mitigating the alkaline stress in Zea mays. Antonie Van Leeuwenhoek 2020; 113:889-905. [PMID: 32152804 DOI: 10.1007/s10482-020-01399-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 03/01/2020] [Indexed: 11/25/2022]
Abstract
Intensification of sodic soil due to increasing pH is an emerging environmental issue. The present study aimed to isolate and characterise alkaline stress-tolerant and plant growth-promoting bacterial strains from moderately alkaline soil (pH 8-9), strongly alkaline soil (pH 9-10), and very strongly alkaline soil (> 10). Total 68 bacteria were isolated, and screened for multiple plant growth promoting (PGP) attributes. Out of total, 42 isolates demonstrating at least three plant growth promoting PGP traits selected for further assays. Then out of 42, 15 bacterial isolates were selected based on enhanced maize plant growth under greenhouse experiment, and 16S rRNA gene sequencing revealed Bacillus spp. as a dominant genus. Furthermore, based on improved seed germination percentage and biomass of maize (Zea mays L.) under alkaline stress conditions Alcaligenes sp. NBRI NB2.5, Bacillus sp. NBRI YE1.3, and Bacillus sp. NBRI YN4.4 bacterial strains were selected, and evaluated for growth-promotion and alkaline stress amelioration under greenhouse condition. Amongst the selected 3 plant growth promoting rhizobacterial (PGPR) strains, Bacillus sp. NBRI YN4.4 significantly improved the photosynthetic pigments and soluble sugar content, and decreased proline level in inoculated maize plants as compared to uninoculated control under stress conditions. Moreover, significantly enhanced soil enzymes such as dehydrogenase, alkaline phosphatase and betaglucosidase due to inoculation of Bacillus sp. NBRI YN4.4 in maize plants grown in alkaline soil attributes to its role in improving the soil health. Therefore, alkaline stress-tolerant PGPR NBRI YN4.4 can be useful for developing strategies for the reclamation of saline/sodic soils and improving the plant growth and soil health in sustainable manner.
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Affiliation(s)
- Vijay Kant Dixit
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226 001, India
- Department of Environmental Science, Kanya Gurukul Campus, Gurukul Kangri University, Haridwar, 249404, India
| | - Sankalp Misra
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226 001, India
| | - Shashank Kumar Mishra
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226 001, India
| | - Shri Krishna Tewari
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226 001, India
| | - Namita Joshi
- Department of Environmental Science, Kanya Gurukul Campus, Gurukul Kangri University, Haridwar, 249404, India
| | - Puneet Singh Chauhan
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226 001, India.
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16
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Venegas-Ortega MG, Flores-Gallegos AC, Aguilar CN, Rodríguez-Herrera R, Martínez-Hernández JL, Nevárez-Moorillón GV. Multi-Functional Potential of Presumptive Lactic Acid Bacteria Isolated from Chihuahua Cheese. Foods 2020; 9:E276. [PMID: 32138215 PMCID: PMC7142663 DOI: 10.3390/foods9030276] [Citation(s) in RCA: 4] [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: 12/30/2019] [Revised: 02/28/2020] [Accepted: 03/02/2020] [Indexed: 02/01/2023] Open
Abstract
The multifunctional properties of autochthonous lactic acid bacteria can be of use for enhancing the sensorial properties of food, as well as in food preservation. An initial screening for antimicrobial, proteolytic, and lipolytic capacities was done in 214 presumptive lactic acid bacteria isolates obtained from Chihuahua cheese manufacturing and during a ripening period of nine months. The antimicrobial screening was done by spot-on-the-lawn tests, using Listeria monocytogenes and Escherichia coli as indicator microorganisms; proteolysis was tested in casein-peptone agar and lipolysis in Mann-Rogosa-Sharpe (MRS)-tributyrin agar. More than 90% of the isolates hydrolyzed the casein, but only 30% hydrolyzed tributyrin; the inhibition of L. monocytogenes in the spot-on-the-lawn assay was used to select 39 isolates that had a bigger inhibition zone (>11.15 mm ± 0.3) than the control (Nisin producer Lactococcus lactis BS-10 Chr Hansen). The selected isolates were grown in MRS to obtain the neutralized cell-free supernatants and verify their antimicrobial activity by agar diffusion and the percentage of growth inhibition techniques. The selected isolates were also growth in casein peptone broth, and the cell-free supernatants were used for the determination of antioxidant activity by the radical scavenging of 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonate) (ABTS) techniques. The results were analyzed to identify similarities by cluster analysis, based on their antimicrobial and antioxidant capacities. The isolates were arranged into six clusters; one cluster that included 12 isolates demonstrated L. monocytogenes (784-2811 mm2/mL AU by agar diffusion assay) and E. coli (41%-47% growth inhibition) antimicrobial activity. The isolates clustered in these groups also showed competitive inhibition of both radicals (11%-19% of DPPH and 50%-60% of ABTS). The isolates from cluster one were also identified by 16S rDNA amplification and were identified as Enterococcus faecium. Traditional products such as Chihuahua cheese can be a source or lactic acid bacteria with metabolic properties that can be used in food preparation and preservation.
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Affiliation(s)
- María Georgina Venegas-Ortega
- Research Group of Bioprocesses and Bioproducts. Department of Food Research, School of Chemistry, Universidad Autónoma de Coahuila, 25280 Saltillo, Coahuila, Mexico
| | - Adriana Carolina Flores-Gallegos
- Research Group of Bioprocesses and Bioproducts. Department of Food Research, School of Chemistry, Universidad Autónoma de Coahuila, 25280 Saltillo, Coahuila, Mexico
| | - Cristóbal Noé Aguilar
- Research Group of Bioprocesses and Bioproducts. Department of Food Research, School of Chemistry, Universidad Autónoma de Coahuila, 25280 Saltillo, Coahuila, Mexico
| | - Raúl Rodríguez-Herrera
- Research Group of Bioprocesses and Bioproducts. Department of Food Research, School of Chemistry, Universidad Autónoma de Coahuila, 25280 Saltillo, Coahuila, Mexico
| | - José Luis Martínez-Hernández
- Research Group of Bioprocesses and Bioproducts. Department of Food Research, School of Chemistry, Universidad Autónoma de Coahuila, 25280 Saltillo, Coahuila, Mexico
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