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Leelagud P, Wang HL, Lu KH, Dai SM. Pseudomonas mosselii: a potential alternative for managing pyrethroid-resistant Aedes aegypti. PEST MANAGEMENT SCIENCE 2024. [PMID: 38634536 DOI: 10.1002/ps.8139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 03/23/2024] [Accepted: 04/18/2024] [Indexed: 04/19/2024]
Abstract
BACKGROUND Aedes aegypti is a widespread mosquito in tropical and subtropical regions that causes significant mortality and morbidity in humans by transmitting diseases, such as dengue fever and Zika virus disease. Synthetic insecticides, such as pyrethroids, have been used to control Ae. aegypti, but these insecticides can also affect nontarget organisms and contaminate soil and water. This study aimed to investigate the mosquitocidal activity of Pseudomonas mosselii isolated from pond sludge against larvae of Ae. aegypti. RESULTS Based on the initial results, similar time-course profiles were obtained for the mosquitocidal activity of the bacterial culture and its supernatant, and the pellet resuspended in Luria-Bertani (LB) medium also showed delayed toxicity. These results imply that the toxic component can be released into the medium from live bacteria. Further research indicated that the toxic component appeared in the supernatant approximately 4 h after a 3-mL stock was cultured in 200 mL of LB medium. The stabilities of the P. mosselii culture and supernatant stored at different temperatures were also evaluated, and the best culture stability was obtained at 28 °C and supernatant stability at 4 °C. The bacterial culture and supernatant were toxic to larvae and pupae of not only susceptible Ae. aegypti but also pyrethroid-resistant strains. CONCLUSION This study highlights the value of the mosquitocidal activity of P. mosselii, which has potential as an alternative insecticide to control pyrethroid-resistant Ae. aegypti in the field. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Piyatida Leelagud
- Department of Entomology, National Chung Hsing University, Taichung, Taiwan
| | - Hui-Liang Wang
- Department of Biotechnology, National Kaohsiung Normal University, Kaohsiung, Taiwan
| | - Kuang-Hui Lu
- Department of Entomology, National Chung Hsing University, Taichung, Taiwan
| | - Shu-Mei Dai
- Department of Entomology, National Chung Hsing University, Taichung, Taiwan
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2
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Grenier V, Gonzalez E, Brereton NJB, Pitre FE. Dynamics of bacterial and archaeal communities during horse bedding and green waste composting. PeerJ 2023; 11:e15239. [PMID: 37159830 PMCID: PMC10163874 DOI: 10.7717/peerj.15239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Accepted: 03/28/2023] [Indexed: 05/11/2023] Open
Abstract
Organic waste decomposition can make up substantial amounts of municipal greenhouse emissions during decomposition. Composting has the potential to reduce these emissions as well as generate sustainable fertilizer. However, our understanding of how complex microbial communities change to drive the chemical and biological processes of composting is still limited. To investigate the microbiota associated with organic waste decomposition, initial composting feedstock (Litter), three composting windrows of 1.5 months (Young phase), 3 months (Middle phase) and 12 months (Aged phase) old, and 24-month-old mature Compost were sampled to assess physicochemical properties, plant cell wall composition and the microbial community using 16S rRNA gene amplification. A total of 2,612 Exact Sequence Variants (ESVs) included 517 annotated as putative species and 694 as genera which together captured 57.7% of the 3,133,873 sequences, with the most abundant species being Thermobifida fusca, Thermomonospora chromogena and Thermobifida bifida. Compost properties changed rapidly over time alongside the diversity of the compost community, which increased as composting progressed, and multivariate analysis indicated significant variation in community composition between each time-point. The abundance of bacteria in the feedstock is strongly correlated with the presence of organic matter and the abundance of plant cell wall components. Temperature and pH are the most strongly correlated parameters with bacterial abundance in the thermophilic and cooling phases/mature compost respectively. Differential abundance analysis revealed 810 ESVs annotated as species significantly varied in relative abundance between Litter and Young phase, 653 between the Young and Middle phases, 1182 between Middle and Aged phases and 663 between Aged phase and mature Compost. These changes indicated that structural carbohydrates and lignin degrading species were abundant at the beginning of the thermophilic phase, especially members of the Firmicute and Actinobacteria phyla. A high diversity of species capable of putative ammonification and denitrification were consistently found throughout the composting phases, whereas a limited number of nitrifying bacteria were identified and were significantly enriched within the later mesophilic composting phases. High microbial community resolution also revealed unexpected species which could be beneficial for agricultural soils enriched with mature compost or for the deployment of environmental and plant biotechnologies. Understanding the dynamics of these microbial communities could lead to improved waste management strategies and the development of input-specific composting protocols to optimize carbon and nitrogen transformation and promote a diverse and functional microflora in mature compost.
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Affiliation(s)
- Vanessa Grenier
- Department of Biological Sciences, Université de Montréal, Montréal, Québec, Canada
- Institut de Recherche en Biologie Végétale, Montréal, Québec, Canada
| | - Emmanuel Gonzalez
- Department of Human Genetics, McGill University, Montréal, Québec, Canada
- Canadian Centre for Computational Genomics, McGill Genome Centre, McGill University, Montréal, Québec, Canada
- Gerald Bronfman Department of Oncology, McGill University, Montréal, Québec, Canada
| | - Nicholas JB Brereton
- School of Biology and Environmental Science, University College Dublin, Dublin, Ireland
| | - Frederic E. Pitre
- Department of Biological Sciences, Université de Montréal, Montréal, Québec, Canada
- Institut de Recherche en Biologie Végétale, Montréal, Québec, Canada
- Montreal Botanical Garden, Montréal, Québec, Canada
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3
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Lopez-Lopez K, Lozano Mahecha RA. Aislamiento y caracterización de bacterias endémicas colombianas con capacidad de degradar tolueno. REVISTA COLOMBIANA DE BIOTECNOLOGÍA 2022. [DOI: 10.15446/rev.colomb.biote.v24n1.98613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Los hidrocarburos aromáticos monocíclicos: benceno, tolueno, etilbenceno y xileno (BTEX), presentes en crudo y refinados de petróleo, hacen parte de los compuestos con más impacto en el medio ambiente y la salud humana, debido a su naturaleza cancerígena, mutagénica y altamente tóxica. Esta investigación tuvo como objetivo obtener y caracterizar bacterias capaces de degradar tolueno. Se realizaron tres muestreos de suelo contaminado con hidrocarburos del Valle del Cauca en tres condiciones: gasolinería, derrame accidental y taller mecánico. Se aislaron bacterias capaces de crecer en tolueno vapor como única fuente de carbono y se caracterizaron a nivel morfológico, bioquímico y molecular. Para la caracterización molecular se amplificó, secuenció y analizó con herramientas bioinformáticas el gen ribosomal 16S. Se evaluó la utilización de tolueno directo con concentración al 1% como única fuente de carbono. Se logró aislar 29 bacterias con capacidad de metabolizar tolueno. La caracterización bioquímica y molecular identificó a las bacterias aisladas de suelo contaminado como Pseudomonas y Stenotrophomonas. Las bacterias aisladas en el taller mecánico resultaron ser los microorganismos con mejor crecimiento en tolueno como fuente de carbono, poseen un gran potencial para ser utilizadas para fines de biorremediación de suelos y aguas contaminadas con BTEX.
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Liu M, Wang S, Yang M, Ning X, Nan Z. Experimental study on treatment of heavy metal-contaminated soil by manganese-oxidizing bacteria. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:5526-5540. [PMID: 34424469 DOI: 10.1007/s11356-021-15475-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 07/13/2021] [Indexed: 06/13/2023]
Abstract
There are many studies on the treatment of heavy metals by manganese-oxidizing bacteria and the reaction is good; the problem of compound pollution of heavy metals in soil has been difficult to solve. In this study, the application of manganese-oxidizing bacteria in soil was studied. The tolerance of manganese-oxidizing strains (Pseudomonas taiwanensis) to environmental conditions and the treatment effect of heavy metals As, Pb, and Cd in aqueous solution were investigated, and the effect of iron-manganese ratio on the treatment effect was discussed. The results showed that the suitable pH conditions for the growth of P. taiwanensis were 5-9, and the salt tolerance was 6% (by sodium chloride). The tolerant concentrations for heavy metals As(V) and Mn(II) were 500 mg L-1 and 120 mg L-1, respectively. The strains were enriched by nutrient broth medium. After the logarithmic phase, the bacterial suspension was mixed with ATCC#279 medium at a ratio of 1:10, and a certain amount (10 mg L-1) of Mn(II) was added. The results of As, Pb, and Cd removal in the composite polluted water phase were 22.09%, 30.75%, and 35.33%, respectively. The molar ratio of manganese and iron affected the removal efficiency of single arsenic, the highest efficiency is 68%, and the ratio of iron to manganese is 1:5. However, when the soil was treated by the same method, the results showed that not all metals were passivated, such as Cu. At the same time, for As, Pb, and Cd, the treatment effects in soil were worse than those in water, perhaps more consideration should be given to environmental conditions, such as soil moisture and temperature, when manganese-oxidizing bacteria are used to treat soil.
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Affiliation(s)
- Mengbo Liu
- College of Earth and Environmental Sciences, Lanzhou University, 222 Tianshui South Road, Lanzhou, 730000, China
| | - Shengli Wang
- College of Earth and Environmental Sciences, Lanzhou University, 222 Tianshui South Road, Lanzhou, 730000, China.
| | - Meng Yang
- College of Earth and Environmental Sciences, Lanzhou University, 222 Tianshui South Road, Lanzhou, 730000, China
| | - Xiang Ning
- College of Earth and Environmental Sciences, Lanzhou University, 222 Tianshui South Road, Lanzhou, 730000, China
| | - Zhongren Nan
- College of Earth and Environmental Sciences, Lanzhou University, 222 Tianshui South Road, Lanzhou, 730000, China
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Nandre V, Kumbhar N, Battu S, Kale Y, Bagade A, Haram S, Kodam K. Siderophore mediated mineralization of struvite: A novel greener route of sustainable phosphate management. WATER RESEARCH 2021; 203:117511. [PMID: 34375932 DOI: 10.1016/j.watres.2021.117511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 06/24/2021] [Accepted: 07/27/2021] [Indexed: 06/13/2023]
Abstract
Efficient and sustainable removal of phosphate ions from an aqueous solution is of great challenge. Herein we demonstrated a greener route for phosphate recovery through struvite formation by using bacterial siderophore. This method was efficient for removal of phosphate as low as 1.3 mM with 99% recovery efficiency. The siderophore produced by Pseudomonas taiwanensis R-12-2 act as template for the nucleation of struvite crystals and was found sustainable for recycling the phosphorous efficiently after twenty cycles. The formation of struvite crystals is driven by surrounding pH (9.0) and presence of Mg2+ and NH4+ ions along with PO43- and siderophore which was further validated by computational studies. The morphology of struvite was characterized by scanning electron microscopy, followed by elemental analysis. Furthermore, our results revealed that the siderophore plays an important role in struvite biomineralization. We have successfully demonstrated the phosphate sequestration by using industrial waste samples, as possible application for environmental sustainability and phosphate conservation. For the first time electrochemical super-capacitance performance of the struvite was studied. The specific capacitance value for the struvite was found to be 320 F g-1 at 1.87 A g-1 and retained 92 % capacitance after 250 cycles. The study revealed the potential implications of siderophore for the phosphate recycling and the new mechanism for biomineralization by sequestering into struvite.
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Affiliation(s)
- Vinod Nandre
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India
| | - Navanath Kumbhar
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India
| | - Shateesh Battu
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India
| | - Yuvraj Kale
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India
| | - Aditi Bagade
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India
| | - Santosh Haram
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India
| | - Kisan Kodam
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India.
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Gutierrez-Albanchez E, García-Villaraco A, Lucas JA, Horche I, Ramos-Solano B, Gutierrez-Mañero FJ. Pseudomonas palmensis sp. nov., a Novel Bacterium Isolated From Nicotiana glauca Microbiome: Draft Genome Analysis and Biological Potential for Agriculture. Front Microbiol 2021; 12:672751. [PMID: 34489881 PMCID: PMC8417607 DOI: 10.3389/fmicb.2021.672751] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Accepted: 07/20/2021] [Indexed: 11/23/2022] Open
Abstract
A novel Pseudomonas, designated strain BBB001T, an aerobic, rod-shaped bacterium, was isolated from the rhizosphere of Nicotiana glauca in Las Palmas Gran Canaria, Spain. Genomic analysis revealed that it could not be assigned to any known species of Pseudomonas, so the name Pseudomonas palmensis sp. nov. was proposed. A 16S rRNA gene phylogenetic analysis suggested affiliation to the Pseudomonas brassicae group, being P. brassicae MAFF212427 T the closest related type strain. Upon genomic comparisons of both strains, all values were below thresholds established for differentiation: average nucleotide identity (ANI, 88.29%), average amino acid identity (AAI, 84.53%), digital DNA-DNA hybridization (dDDH, 35.4%), and TETRA values (0.98). When comparing complete genomes, a total of 96 genes present exclusively in BBB001T were identified, 80 of which appear associated with specific subsystems. Phenotypic analysis has shown its ability to assimilate glucose, potassium gluconate, capric acid malate, trisodium citrate, and phenylacetic acid; it was oxidase positive. It is able to produce auxins and siderophores in vitro; its metabolic profile based on BIOLOG Eco has shown a high catabolic capacity. The major fatty acids accounting for 81.17% of the total fatty acids were as follows: C16:0 (33.29%), summed feature 3 (22.80%) comprising C16:1 ω7c and C16:1 ω6c, summed feature 8 (13.66%) comprising C18:1 ω7c, and C18:1ω6c and C17:0 cyclo (11.42%). The ability of this strain to improve plant fitness was tested on tomato and olive trees, demonstrating a great potential for agriculture as it is able to trigger herbaceous and woody species. First, it was able to improve iron nutrition and growth on iron-starved tomatoes, demonstrating its nutrient mobilization capacity; this effect is related to its unique genes related to iron metabolism. Second, it increased olive and oil yield up to 30% on intensive olive orchards under water-limiting conditions, demonstrating its capacity to improve adaptation to adverse conditions. Results from genomic analysis together with differences in phenotypic features and chemotaxonomic analysis support the proposal of strain BBB001T (=LMG 31775T = NCTC 14418T) as the type strain of a novel species for which the name P. palmensis sp. nov is proposed.
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Affiliation(s)
- Enrique Gutierrez-Albanchez
- Biobab R&D S. L., Madrid, Spain
- Plant Physiology, Pharmaceutical and Health Sciences Department, Faculty of Pharmacy, Universidad San Pablo-CEU Universities, Boadilla del Monte, Spain
| | - Ana García-Villaraco
- Plant Physiology, Pharmaceutical and Health Sciences Department, Faculty of Pharmacy, Universidad San Pablo-CEU Universities, Boadilla del Monte, Spain
| | - José A. Lucas
- Plant Physiology, Pharmaceutical and Health Sciences Department, Faculty of Pharmacy, Universidad San Pablo-CEU Universities, Boadilla del Monte, Spain
| | | | - Beatriz Ramos-Solano
- Plant Physiology, Pharmaceutical and Health Sciences Department, Faculty of Pharmacy, Universidad San Pablo-CEU Universities, Boadilla del Monte, Spain
| | - F. J. Gutierrez-Mañero
- Plant Physiology, Pharmaceutical and Health Sciences Department, Faculty of Pharmacy, Universidad San Pablo-CEU Universities, Boadilla del Monte, Spain
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7
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Complete Genome Sequence of Pseudomonas taiwanensis WRS8, a Plant Growth-Promoting and Biotite-Weathering Strain. Microbiol Resour Announc 2021; 10:10/18/e00252-21. [PMID: 33958421 PMCID: PMC8103866 DOI: 10.1128/mra.00252-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Pseudomonas taiwanensis WRS8 is a biotite-weathering organism isolated from wheat root. Here, we report its complete genome sequence, which may shed light on its role in plant growth promotion and biotite weathering. Pseudomonas taiwanensis WRS8 is a biotite-weathering organism isolated from wheat root. Here, we report its complete genome sequence, which may shed light on its role in plant growth promotion and biotite weathering.
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Teoh MC, Furusawa G, Veera Singham G. Multifaceted interactions between the pseudomonads and insects: mechanisms and prospects. Arch Microbiol 2021; 203:1891-1915. [PMID: 33634321 DOI: 10.1007/s00203-021-02230-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 12/19/2020] [Accepted: 02/11/2021] [Indexed: 02/07/2023]
Abstract
Insects and bacteria are the most widespread groups of organisms found in nearly all habitats on earth, establishing diverse interactions that encompass the entire range of possible symbiotic associations from strict parasitism to obligate mutualism. The complexity of their interactions is instrumental in shaping the roles of insects in the environment, meanwhile ensuring the survival and persistence of the associated bacteria. This review aims to provide detailed insight on the multifaceted symbiosis between one of the most versatile bacterial genera, Pseudomonas (Gammaproteobacteria: Pseudomonadaceae) and a diverse group of insect species. The Pseudomonas engages with varied interactions with insects, being either a pathogen or beneficial endosymbiont, as well as using insects as vectors. In addition, this review also provides updates on existing and potential applications of Pseudomonas and their numerous insecticidal metabolites as biocontrol agents against pest insects for the improvement of integrated pest management strategies. Here, we have summarized several known modes of action and the virulence factors of entomopathogenic Pseudomonas strains essential for their pathogenicity against insects. Meanwhile, the beneficial interactions between pseudomonads and insects are currently limited to a few known insect taxa, despite numerous studies reporting identification of pseudomonads in the guts and haemocoel of various insect species. The vector-symbiont association between pseudomonads and insects can be diverse from strict phoresy to a role switch from commensalism to parasitism following a dose-dependent response. Overall, the pseudomonads appeared to have evolved independently to be either exclusively pathogenic or beneficial towards insects.
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Affiliation(s)
- Miao-Ching Teoh
- Centre for Chemical Biology, Universiti Sains Malaysia, 11900, Bayan Lepas, Penang, Malaysia
| | - Go Furusawa
- Centre for Chemical Biology, Universiti Sains Malaysia, 11900, Bayan Lepas, Penang, Malaysia
| | - G Veera Singham
- Centre for Chemical Biology, Universiti Sains Malaysia, 11900, Bayan Lepas, Penang, Malaysia.
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Whole Genome Sequencing and Tn 5-Insertion Mutagenesis of Pseudomonas taiwanensis CMS to Probe Its Antagonistic Activity Against Rice Bacterial Blight Disease. Int J Mol Sci 2020; 21:ijms21228639. [PMID: 33207795 PMCID: PMC7696974 DOI: 10.3390/ijms21228639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 11/12/2020] [Accepted: 11/13/2020] [Indexed: 01/07/2023] Open
Abstract
The Gram-negative bacterium Pseudomonas taiwanensis is a novel bacterium that uses shrimp shell waste as its sole sources of carbon and nitrogen. It is a versatile bacterium with potential for use in biological control, with activities including toxicity toward insects, fungi, and the rice pathogen Xanthomonas oryzae pv.oryzae (Xoo). In this study, the complete 5.08-Mb genome sequence of P. taiwanensis CMS was determined by a combination of NGS/Sanger sequencing and optical mapping. Comparison of optical maps of seven Pseudomonas species showed that P. taiwanensis is most closely related to P. putida KT 2400. We screened a total of 11,646 individual Tn5-transponson tagged strains to identify genes that are involved in the production and regulation of the iron-chelator pyoverdine in P. taiwanensis, which is a key anti-Xoo factor. Our results indicated that the two-component system (TCS) EnvZ/OmpR plays a positive regulatory role in the production of pyoverdine, whereas the sigma factor RpoS functions as a repressor. The knowledge of the molecular basis of the regulation of pyoverdine by P. taiwanensis provided herein will be useful for its development for use in biological control, including as an anti-Xoo agent.
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Lai B, Bernhardt PV, Krömer JO. Cytochrome c Reductase is a Key Enzyme Involved in the Extracellular Electron Transfer Pathway towards Transition Metal Complexes in Pseudomonas Putida. CHEMSUSCHEM 2020; 13:5308-5317. [PMID: 32678505 PMCID: PMC7589348 DOI: 10.1002/cssc.202001645] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 07/16/2020] [Indexed: 05/06/2023]
Abstract
Mediator-based extracellular electron transfer (EET) pathways can balance the redox metabolism of microbes. However, such electro-biosynthesis processes are constrained by the unknown underlying EET mechanisms. In this paper, Pseudomonas putida was studied to systematically investigate its EET pathway to transition metal complexes (i. e., [Fe(CN)6 ]3-/4- and [Co(bpy)3 ]3+/2+ ; bpy=2,2'-bipyridyl) under anaerobic conditions. Comparative proteomics showed the aerobic respiratory components were upregulated in a bioelectrochemical system without oxygen, suggesting their potential contribution to EET. Further tests found inhibiting cytochrome c oxidase activity by NaN3 and NADH dehydrogenase by rotenone did not significantly change the current output. However, the EET pathway was completely blocked, while cytochrome c reductase activity was inhibited by antimycin A. Although it cannot be excluded that cytochrome c and the periplasmic subunit of cytochrome c oxidase donate electrons to the transition metal complexes, these results strongly demonstrate that cytochrome c reductase is a key complex for the EET pathway.
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Affiliation(s)
- Bin Lai
- Systems Biotechnology group, Department of Solar MaterialsHelmholtz Centre for Environmental Research - UFZLeipzig04318Germany
- Advanced Water Management CentreThe University of QueenslandBrisbane4072Australia
| | - Paul V. Bernhardt
- School of Chemical and Molecular BiosciencesThe University of QueenslandBrisbane4072Australia
| | - Jens O. Krömer
- Systems Biotechnology group, Department of Solar MaterialsHelmholtz Centre for Environmental Research - UFZLeipzig04318Germany
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11
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Peña A, Busquets A, Gomila M, Mulet M, Gomila RM, Garcia-Valdes E, Reddy TBK, Huntemann M, Varghese N, Ivanova N, Chen IM, Göker M, Woyke T, Klenk HP, Kyrpides N, Lalucat J. High-quality draft genome sequences of Pseudomonas monteilii DSM 14164 T, Pseudomonas mosselii DSM 17497 T, Pseudomonas plecoglossicida DSM 15088 T, Pseudomonas taiwanensis DSM 21245 T and Pseudomonas vranovensis DSM 16006 T: taxonomic considerations. Access Microbiol 2020; 1:e000067. [PMID: 32974501 PMCID: PMC7491935 DOI: 10.1099/acmi.0.000067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 09/20/2019] [Indexed: 11/21/2022] Open
Abstract
Pseudomonas is the bacterial genus of Gram-negative bacteria with the highest number of recognized species. It is divided phylogenetically into three lineages and at least 11 groups of species. The Pseudomonas putida group of species is one of the most versatile and best studied. It comprises 15 species with validly published names. As a part of the Genomic Encyclopedia of Bacteria and Archaea (GEBA) project, we present the genome sequences of the type strains of five species included in this group: Pseudomonas monteilii (DSM 14164T), Pseudomonas mosselii (DSM 17497T), Pseudomonas plecoglossicida (DSM 15088T), Pseudomonas taiwanensis (DSM 21245T) and Pseudomonas vranovensis (DSM 16006T). These strains represent species of environmental and also of clinical interest due to their pathogenic properties against humans and animals. Some strains of these species promote plant growth or act as plant pathogens. Their genome sizes are among the largest in the group, ranging from 5.3 to 6.3 Mbp. In addition, the genome sequences of the type strains in the Pseudomonas taxonomy were analysed via genome-wide taxonomic comparisons of ANIb, gANI and GGDC values among 130 Pseudomonas strains classified within the group. The results demonstrate that at least 36 genomic species can be delineated within the P. putida phylogenetic group of species.
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Affiliation(s)
- Arantxa Peña
- Department of Biology-Microbiology, Universitat de les Illes Balears, Palma de, Mallorca, Spain
| | - Antonio Busquets
- Department of Biology-Microbiology, Universitat de les Illes Balears, Palma de, Mallorca, Spain
| | - Margarita Gomila
- Department of Biology-Microbiology, Universitat de les Illes Balears, Palma de, Mallorca, Spain
| | - Magdalena Mulet
- Department of Biology-Microbiology, Universitat de les Illes Balears, Palma de, Mallorca, Spain
| | - Rosa M Gomila
- Serveis Cientifico-Tècnics, Universitat de les Illes Balears, Palma de Mallorca, Spain
| | - Elena Garcia-Valdes
- Department of Biology-Microbiology, Universitat de les Illes Balears, Palma de, Mallorca, Spain.,Institut Mediterrani d'Estudis Avançats (IMEDEA, CSIC-UIB), Palma de Mallorca, Spain
| | - T B K Reddy
- DOE Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA 94598-1698, USA
| | - Marcel Huntemann
- DOE Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA 94598-1698, USA
| | - Neha Varghese
- DOE Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA 94598-1698, USA
| | - Natalia Ivanova
- DOE Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA 94598-1698, USA
| | - I-Min Chen
- DOE Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA 94598-1698, USA
| | - Markus Göker
- Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, 38124 Braunschweig, Germany
| | - Tanja Woyke
- DOE Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA 94598-1698, USA
| | - Hans-Peter Klenk
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Nikos Kyrpides
- DOE Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA 94598-1698, USA
| | - Jorge Lalucat
- Department of Biology-Microbiology, Universitat de les Illes Balears, Palma de, Mallorca, Spain.,Institut Mediterrani d'Estudis Avançats (IMEDEA, CSIC-UIB), Palma de Mallorca, Spain
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12
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Azizoglu U, Jouzani GS, Yilmaz N, Baz E, Ozkok D. Genetically modified entomopathogenic bacteria, recent developments, benefits and impacts: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 734:139169. [PMID: 32460068 DOI: 10.1016/j.scitotenv.2020.139169] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 04/10/2020] [Accepted: 04/30/2020] [Indexed: 06/11/2023]
Abstract
Entomopathogenic bacteria (EPBs), insect pathogens that produce pest-specific toxins, are environmentally-friendly alternatives to chemical insecticides. However, the most important problem with EPBs application is their limited field stability. Moreover, environmental factors such as solar radiation, leaf temperature, and vapor pressure can affect the pathogenicity of these pathogens and their toxins. Scientists have conducted intensive research to overcome such problems. Genetic engineering has great potential for the development of new engineered entomopathogens with more resistance to adverse environmental factors. Genetically modified entomopathogenic bacteria (GM-EPBs) have many advantages over wild EPBs, such as higher pathogenicity, lower spraying requirements and longer-term persistence. Genetic manipulations have been mostly applied to members of the bacterial genera Bacillus, Lysinibacillus, Pseudomonas, Serratia, Photorhabdus and Xenorhabdus. Although many researchers have found that GM-EPBs can be used safely as plant protection bioproducts, limited attention has been paid to their potential ecological impacts. The main concerns about GM-EPBs and their products are their potential unintended effects on beneficial insects (predators, parasitoids, pollinators, etc.) and rhizospheric bacteria. This review address recent update on the significant role of GM-EPBs in biological control, examining them through different perspectives in an attempt to generate critical discussion and aid in the understanding of their potential ecological impacts.
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Affiliation(s)
- Ugur Azizoglu
- Department of Crop and Animal Production, Safiye Cikrikcioglu Vocational College, Kayseri University, Kayseri, Turkey.
| | - Gholamreza Salehi Jouzani
- Microbial Biotechnology Department, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - Nihat Yilmaz
- Department of Crop and Animal Production, Safiye Cikrikcioglu Vocational College, Kayseri University, Kayseri, Turkey
| | - Ethem Baz
- Laboratory and Veterinary Health Department, Safiye Cikrikcioglu Vocational College, Kayseri University, Kayseri, Turkey
| | - Duran Ozkok
- Department of Crop and Animal Production, Safiye Cikrikcioglu Vocational College, Kayseri University, Kayseri, Turkey
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13
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Biodegradation of Amoxicillin, Tetracyclines and Sulfonamides in Wastewater Sludge. WATER 2020. [DOI: 10.3390/w12082147] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The removal of antibiotics from the aquatic environment has received great interest. The aim of this study is to examine degradation of oxytetracycline (OTC), tetracycline (TC), chlortetracycline (CTC), amoxicillin (AMO), sulfamethazine (SMZ), sulfamethoxazole (SMX), sulfadimethoxine (SDM) in sludge. Four antibiotic-degrading bacterial strains, SF1 (Pseudmonas sp.), A12 (Pseudmonas sp.), strains B (Bacillus sp.), and SANA (Clostridium sp.), were isolated, identified and tested under aerobic and anaerobic conditions in this study. Batch experiments indicated that the addition of SF1 and A12 under aerobic conditions and the addition of B and SANA under anaerobic conditions increased the biodegradation of antibiotics in sludge. Moreover, the results of repeated addition experiments indicated that the efficiency of the biodegradation of antibiotics using the isolated bacterial strains could be maintained for three degradation cycles. Two groups of potential microbial communities associated with the aerobic and anaerobic degradation of SMX, AMO and CTC in sludge were revealed. Twenty-four reported antibiotics-degrading bacterial genera (Achromobacter, Acidovorax, Acinetobacter, Alcaligenes, Bacillus, Burkholderia, Castellaniella, Comamonas, Corynebacterium, Cupriavidus, Dechloromonas, Geobacter, Gordonia, Klebsiella, Mycobacterium, Novosphingobium, Pandoraea, Pseudomonas, Rhodococcus, Sphingomonas, Thauera, Treponema, Vibrio and Xanthobacter) were found in both the aerobic and anaerobic groups, suggesting that these 24 bacterial genera may be the major antibiotic-degrading bacteria in sludge.
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14
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Guerrieri MC, Fanfoni E, Fiorini A, Trevisan M, Puglisi E. Isolation and Screening of Extracellular PGPR from the Rhizosphere of Tomato Plants after Long-Term Reduced Tillage and Cover Crops. PLANTS 2020; 9:plants9050668. [PMID: 32466288 PMCID: PMC7285081 DOI: 10.3390/plants9050668] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 05/19/2020] [Accepted: 05/20/2020] [Indexed: 02/04/2023]
Abstract
Plant growth promoting rhizobacteria provide an innovative solution to address challenges in sustainable agro-ecosystems, improving plant growth as well as acting as agents of biocontrol. In this study autochthonous bacteria were isolated from the rhizosphere of processing tomato plants (Solanum lycopersicum L.) cultivated with conservation agriculture practices (i.e., reduced tillage and cover crops), and evaluated for both growth-promoting activities (PGPAs), and antagonistic potential against the phytopathogenic pest Sclerotinia sclerotiorum. Considering the several activities of PGPR, we decided to structure the screening with a hierarchic approach, starting from testing the capability of fixing nitrogen. The obtained bacteria were processed through the molecular typing technique rep-PCR (Repetitive Extragenic Palindromic) in order to discriminate microbial strains with the same profiles, and identified via 16S rDNA sequencing. Thirty-eight selected isolates were screened in vitro for different activities related to plant nutrition and plant growth regulation as well as for antifungal traits. Isolated bacteria were found to exhibit different efficiencies in indoleacetic acid production and siderophore production, phosphate solubilization and biocontrol activity against the widespread soil-borne plant pathogen S. sclerotiorum. All the 38 bacterial isolates showed at least one property tested. With a view to detect the suitable candidates to be developed as biofertilizers, the selected isolates were ranked by their potential ability to function as PGPR. Thus, consortium of native PGPR bacteria inoculants may represent a suitable solution to address the challenges in sustainable agriculture, to ensure crop yield and quality, lowering the application of chemicals input.
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Affiliation(s)
- Maria Chiara Guerrieri
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy; (M.C.G.); (E.F.); (E.P.)
| | - Elisabetta Fanfoni
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy; (M.C.G.); (E.F.); (E.P.)
| | - Andrea Fiorini
- Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy;
| | - Marco Trevisan
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy; (M.C.G.); (E.F.); (E.P.)
- Correspondence: ; Tel.: +39-0523-599152
| | - Edoardo Puglisi
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy; (M.C.G.); (E.F.); (E.P.)
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15
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Diversity and Genetic Basis for Carbapenem Resistance in a Coastal Marine Environment. Appl Environ Microbiol 2020; 86:AEM.02939-19. [PMID: 32198174 DOI: 10.1128/aem.02939-19] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 03/07/2020] [Indexed: 11/20/2022] Open
Abstract
Resistance to the "last-resort" antibiotics, such as carbapenems, has led to very few antibiotics being left to treat infections by multidrug-resistant bacteria. Spread of carbapenem resistance (CR) has been well characterized for the clinical environment. However, there is a lack of information about its environmental distribution. Our study reveals that CR is present in a wide range of Gram-negative bacteria in the coastal seawater environment, including four phyla, eight classes, and 30 genera. These bacteria were likely introduced into seawater via stormwater flows. Some CR isolates found here, such as Acinetobacter junii, Acinetobacter johnsonii, Brevundimonas vesicularis, Enterococcus durans, Pseudomonas monteilii, Pseudomonas fulva, and Stenotrophomonas maltophilia, are further relevant to human health. We also describe a novel metallo-β-lactamase (MBL) for marine Rheinheimera isolates with CR, which has likely been horizontally transferred to Citrobacter freundii or Enterobacter cloacae In contrast, another MBL of the New Delhi type was likely acquired by environmental Variovorax isolates from Escherichia coli, Klebsiella pneumoniae, or Acinetobacter baumannii utilizing a plasmid. Our findings add to the growing body of evidence that the aquatic environment is both a reservoir and a vector for novel CR genes.IMPORTANCE Resistance against the "last-resort" antibiotics of the carbapenem family is often based on the production of carbapenemases, and this has been frequently observed in clinical samples. However, the dissemination of carbapenem resistance (CR) in the environment has been less well explored. Our study shows that CR is commonly found in a range of bacterial taxa in the coastal aquatic environment and can involve the exchange of novel metallo-β-lactamases from typical environmental bacteria to potential human pathogens or vice versa. The outcomes of this study contribute to a better understanding of how aquatic and marine bacteria can act as reservoirs and vectors for CR outside the clinical setting.
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Tohya M, Watanabe S, Tada T, Tin HH, Kirikae T. Genome analysis-based reclassification of Pseudomonas fuscovaginae and Pseudomonas shirazica as later heterotypic synonyms of Pseudomonas asplenii and Pseudomonas asiatica, respectively. Int J Syst Evol Microbiol 2020; 70:3547-3552. [DOI: 10.1099/ijsem.0.004199] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
This study was conducted to clarify the taxonomic status of the species
Pseudomonas fuscovaginae
and
Pseudomonas shirazica
. Whole genome sequences for the type strains of
P. fuscovaginae
and
P. shirazica
were compared against the closely related type strains of the
Pseudomonas putida
group and the
Pseudomonas fluorescens
group species. Average nucleotide identity and digital DNA–DNA hybridization values between
P. fuscovaginae
LMG 2158T and
Pseudomonas asplenii
ATCC 23835T were 98.4 and 85.5 %, and between
P. shirazica
VM14T and
Pseudomonas asiatica
RYU5T were 99.3 and 95.3 %. These values were greater than recognized thresholds for bacterial species delineation, indicating that they belong to the same genomospecies, respectively. Therefore,
P. fuscovaginae
and
P. shirazica
should be reclassified as later heterotypic synonyms of
P. asplenii
and
P. asiatica
, respectively.
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Affiliation(s)
- Mari Tohya
- Department of Microbiology, Juntendo University School of Medicine, Tokyo, Japan
| | - Shin Watanabe
- Department of Microbiome Research, Juntendo University School of Medicine, Tokyo, Japan
| | - Tatsuya Tada
- Department of Microbiology, Juntendo University School of Medicine, Tokyo, Japan
| | | | - Teruo Kirikae
- Department of Microbiology, Juntendo University School of Medicine, Tokyo, Japan
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17
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Keshavarz-Tohid V, Vacheron J, Dubost A, Prigent-Combaret C, Taheri P, Tarighi S, Taghavi SM, Moënne-Loccoz Y, Muller D. Genomic, phylogenetic and catabolic re-assessment of the Pseudomonas putida clade supports the delineation of Pseudomonas alloputida sp. nov., Pseudomonas inefficax sp. nov., Pseudomonas persica sp. nov., and Pseudomonas shirazica sp. nov. Syst Appl Microbiol 2019; 42:468-480. [DOI: 10.1016/j.syapm.2019.04.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/15/2019] [Accepted: 04/21/2019] [Indexed: 12/21/2022]
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18
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Assessment of Airborne Bacterial and Fungal Communities in Selected Areas of Teaching Hospital, Kandy, Sri Lanka. BIOMED RESEARCH INTERNATIONAL 2019; 2019:7393926. [PMID: 31309114 PMCID: PMC6594343 DOI: 10.1155/2019/7393926] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 04/13/2019] [Accepted: 05/21/2019] [Indexed: 02/06/2023]
Abstract
Nosocomial infections, in lay term known as hospital acquired infections, are caused mainly by airborne pathogens found in healthcare facilities and their surroundings. The aim of this study was to quantify and identify bacteria and fungi in a hospital, which is an understudied area of air quality in Sri Lanka. Air samples were collected in agar medium and petri plates containing sterile filter papers. The number of culturable and total airborne microorganisms was estimated by manual counting and fluorescent microscopy, respectively. The morphologically distant bacteria and fungi were identified by DNA sequencing. The statistical analysis revealed significant variances between studied sites (p < 0.05) where Outpatients Department and Respiratory Unit showed higher levels of airborne microbial load. Culturable microbial count was higher at noon (hospital visiting hours) compared to other sampling periods (after hospital visiting hours) within the hospital. Total count of airborne microbes was found to be the highest during the afternoon. The most sensitive zones such as Operating Theatre and Intensive Care Unit showed considerably higher counts of airborne microbes. Identification by molecular means revealed the presence of human pathogens in the hospital air including Bacillus sp, Micrococcus sp, Pseudomonas sp, Staphylococcu ssp, Exiguobacterium sp, Enterobacter sp, Escherichia sp, Sphingomonas sp, Massilia sp, Kocuria sp, Fusarium sp, and Aspergillus sp. In conclusion, the results from this study indicate that the hospital air was generally contaminated. Therefore, the implementation of proactive policies and strategies are needed to monitor hospital air quality in sensitive zones as well as other areas of the hospitals.
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19
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Tohya M, Watanabe S, Teramoto K, Uechi K, Tada T, Kuwahara-Arai K, Kinjo T, Maeda S, Nakasone I, Zaw NN, Mya S, Zan KN, Tin HH, Fujita J, Kirikae T. Pseudomonas asiatica sp. nov., isolated from hospitalized patients in Japan and Myanmar. Int J Syst Evol Microbiol 2019; 69:1361-1368. [PMID: 30810522 DOI: 10.1099/ijsem.0.003316] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A novel Gram-negative, aerobic, rod-shaped, non-spore-forming bacterial strain, RYU5T, was isolated from a stool sample of an inpatient at a hospital in Okinawa, Japan. The optimal growth temperature of RYU5T was 30 °C. Phylogenetic analysis based on the sequences of housekeeping genes, including the 16S rRNA, rpoB, rpoD and gyrB genes, showed that RYU5T was a member of the Pseudomonas putida group and was located close to Pseudomonas monteilii and P. putida. Whole-genome comparisons, using average nucleotide identity and digital DNA-DNA hybridization, confirmed that strain RYU5T should be classified as a novel species of Pseudomonas. Phenotypic characterization tests showed that utilization of d-mannose, d-serine, l-arabinose and d-fructose could distinguish this strain from other related species of the genus Pseudomonas. Based on genetic and phenotypic evidence, strain RYU5T should be classified as a novel species, for which the name Pseudomonas asiatica sp. nov. is proposed. The type strain is RYU5T (=DSM 107182T, =JCM 32716T), with a DNA G+C content of 62.25 mol%.
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Affiliation(s)
- Mari Tohya
- 1Department of Microbiology, Juntendo University School of Medicine, Tokyo, Japan
| | - Shin Watanabe
- 2Department of Microbiome Research, Juntendo University School of Medicine, Tokyo, Japan
| | - Kanae Teramoto
- 3Koichi Tanaka Mass Spectrometry Research Laboratory, Kyoto, Japan
| | - Kohei Uechi
- 4Department of Infectious Diseases, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Tatsuya Tada
- 1Department of Microbiology, Juntendo University School of Medicine, Tokyo, Japan
| | - Kyoko Kuwahara-Arai
- 1Department of Microbiology, Juntendo University School of Medicine, Tokyo, Japan
| | - Takeshi Kinjo
- 4Department of Infectious Diseases, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Shiro Maeda
- 5Division of Clinical Laboratory and Blood Transfusion, University Hospital of the Ryukyus, Okinawa, Japan
| | - Isamu Nakasone
- 4Department of Infectious Diseases, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Ni Ni Zaw
- 6Clinical Pathology Section, Mandalay General Hospital, Mandalay, Myanmar
| | - San Mya
- 7National Health Laboratory, Yangon, Myanmar
| | | | | | - Jiro Fujita
- 4Department of Infectious Diseases, Respiratory, and Digestive Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Teruo Kirikae
- 1Department of Microbiology, Juntendo University School of Medicine, Tokyo, Japan
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20
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Wang MQ, Wang Z, Yu LN, Zhang CS, Bi J, Sun J. Pseudomonas qingdaonensis sp. nov., an aflatoxin-degrading bacterium, isolated from peanut rhizospheric soil. Arch Microbiol 2019; 201:673-678. [DOI: 10.1007/s00203-019-01636-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 01/18/2019] [Accepted: 02/18/2019] [Indexed: 10/27/2022]
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21
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Assessment of plant growth promoting activities of five rhizospheric Pseudomonas strains. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2018. [DOI: 10.1016/j.bcab.2018.08.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Wei Y, Mao H, Xu Y, Zou W, Fang J, Blom J. Pseudomonas abyssi sp. nov., isolated from the abyssopelagic water of the Mariana Trench. Int J Syst Evol Microbiol 2018; 68:2462-2467. [DOI: 10.1099/ijsem.0.002785] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Yuli Wei
- 2National Engineering Research Centre for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, PR China
- 3The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, PR China
- 1Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, PR China
| | - Haiyan Mao
- 1Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, PR China
| | - Yunping Xu
- 1Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, PR China
| | - Wencai Zou
- 1Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, PR China
| | - Jiasong Fang
- 4Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China
- 1Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, PR China
- 5Department of Natural Sciences, Hawaii Pacific University, Honolulu, HI 96813, USA
| | - Jochen Blom
- 6Bioinformatics and Systems Biology, Justus-Liebig-University Giessen, Giessen, 35392, Germany
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23
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The current status on the taxonomy of Pseudomonas revisited: An update. INFECTION GENETICS AND EVOLUTION 2017; 57:106-116. [PMID: 29104095 DOI: 10.1016/j.meegid.2017.10.026] [Citation(s) in RCA: 131] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 10/28/2017] [Accepted: 10/30/2017] [Indexed: 12/20/2022]
Abstract
The genus Pseudomonas described in 1894 is one of the most diverse and ubiquitous bacterial genera which encompass species isolated worldwide. In the last years more than 70 new species have been described, which were isolated from different environments, including soil, water, sediments, air, animals, plants, fungi, algae, compost, human and animal related sources. Some of these species have been isolated in extreme environments, such as Antarctica or Atacama desert, and from contaminated water or soil. Also, some species recently described are plant or animal pathogens. In this review, we revised the current status of the taxonomy of genus Pseudomonas and the methodologies currently used for the description of novel species which includes, in addition to the classic ones, new methodologies such as MALDI-TOF MS, MLSA and genome analyses. The novel Pseudomonas species described in the last years are listed, together with the available genome sequences of the type strains of Pseudomonas species present in different databases.
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Yonezuka K, Shimodaira J, Tabata M, Ohji S, Hosoyama A, Kasai D, Yamazoe A, Fujita N, Ezaki T, Fukuda M. Phylogenetic analysis reveals the taxonomically diverse distribution of the Pseudomonas putida group. J GEN APPL MICROBIOL 2017; 63:1-10. [DOI: 10.2323/jgam.2016.06.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Kenta Yonezuka
- Department of Bioengineering, Nagaoka University of Technology
| | - Jun Shimodaira
- Biological Resource Center, National Institute of Technology and Evaluation
| | - Michiro Tabata
- Department of Bioengineering, Nagaoka University of Technology
| | - Shoko Ohji
- Biological Resource Center, National Institute of Technology and Evaluation
| | - Akira Hosoyama
- Biological Resource Center, National Institute of Technology and Evaluation
| | - Daisuke Kasai
- Department of Bioengineering, Nagaoka University of Technology
| | - Atsushi Yamazoe
- Biological Resource Center, National Institute of Technology and Evaluation
| | - Nobuyuki Fujita
- Biological Resource Center, National Institute of Technology and Evaluation
| | - Takayuki Ezaki
- Department of Microbiology, Gifu University Graduate School of Medicine
| | - Masao Fukuda
- Department of Bioengineering, Nagaoka University of Technology
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25
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Chen WJ, Kuo TY, Hsieh FC, Chen PY, Wang CS, Shih YL, Lai YM, Liu JR, Yang YL, Shih MC. Involvement of type VI secretion system in secretion of iron chelator pyoverdine in Pseudomonas taiwanensis. Sci Rep 2016; 6:32950. [PMID: 27605490 PMCID: PMC5015096 DOI: 10.1038/srep32950] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 08/17/2016] [Indexed: 12/29/2022] Open
Abstract
Rice bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo) is one of the most destructive rice diseases worldwide. Therefore, in addition to breeding disease-resistant rice cultivars, it is desirable to develop effective biocontrol agents against Xoo. Here, we report that a soil bacterium Pseudomonas taiwanensis displayed strong antagonistic activity against Xoo. Using matrix-assisted laser desorption/ionization imaging mass spectrometry, we identified an iron chelator, pyoverdine, secreted by P. taiwanensis that could inhibit the growth of Xoo. Through Tn5 mutagenesis of P. taiwanensis, we showed that mutations in genes that encode components of the type VI secretion system (T6SS) as well as biosynthesis and maturation of pyoverdine resulted in reduced toxicity against Xoo. Our results indicated that T6SS is involved in the secretion of endogenous pyoverdine. Mutations in T6SS component genes affected the secretion of mature pyoverdine from the periplasmic space into the extracellular medium after pyoverdine precursor is transferred to the periplasm by the inner membrane transporter PvdE. In addition, we also showed that other export systems, i.e., the PvdRT-OpmQ and MexAB-OprM efflux systems (for which there have been previous suggestions of involvement) and the type II secretion system (T2SS), are not involved in pyoverdine secretion.
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Affiliation(s)
- Wen-Jen Chen
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan.,Institute of Biotechnology, National Taiwan University, Taipei, 10617, Taiwan
| | - Tzu-Yen Kuo
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Feng-Chia Hsieh
- Biopesticide Division, Taiwan Agricultural Chemicals and Toxic Substances Research Institute, Council of Agriculture, Taichung, 41358, Taiwan
| | - Pi-Yu Chen
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Chang-Sheng Wang
- Department of Agronomy, National Chung Hsing University, Taichung, 40227, Taiwan
| | - Yu-Ling Shih
- Institute of Biological Chemistry, Academia Sinica, Taipei, 11529, Taiwan
| | - Ying-Mi Lai
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Je-Ruei Liu
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan.,Institute of Biotechnology, National Taiwan University, Taipei, 10617, Taiwan
| | - Yu-Liang Yang
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Ming-Che Shih
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 11529, Taiwan.,Institute of Biotechnology, National Taiwan University, Taipei, 10617, Taiwan
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26
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Wang MQ, Sun L. Pseudomonas oceani sp. nov., isolated from deep seawater. Int J Syst Evol Microbiol 2016; 66:4250-4255. [PMID: 27468709 DOI: 10.1099/ijsem.0.001343] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In this study, we identified a novel Gram-stain-negative, aerobic, motile, and rod-shaped bacterium, strain KX 20T, isolated from the deep seawater in Okinawa Trough, northwestern Pacific Ocean. Phylogenetic analysis based on 16S rRNA gene sequence showed that strain KX 20T was related to members of the genus Pseudomonas and shares the highest sequence identities with Pseudomonas aestusnigri CECT 8317T (99.4 %) and Pseudomonas pachastrellae JCM 12285T (98.5 %). The 16S rRNA gene sequence identities between strain KX 20T and other members of the genus Pseudomonaswere below 96.6 %. The gyrB and rpoD genes of strain KX 20T shared 82.0 to 89.3 % sequence identity with the gyrB and rpoD genes of the closest phylogenetic neighbours of KX 20T. The predominant cellular fatty acids of strain KX 20T were summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c) (29.2 %), C16 : 0 (24.5 %), summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c) (21.5 %) and C12 : 0 (8.2 %). The major polar lipids of strain KX 20T were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and unknown phospholipids. The genomic DNA G+C content of strain KX 20T was 62.9 mol%. On the basis of phylogenetic analysis and phenotypic characteristics, a novel species, Pseudomonas oceani sp. nov. is proposed. The type strain is KX 20T (=CGMCC 1.15195T=DSM 100277T).
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Affiliation(s)
- Ming-Qing Wang
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China.,Function Laboratory for Marine Biology and Biotechnology, Qingdao National Oceanography Laboratory, Qingdao, PR China
| | - Li Sun
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China.,Function Laboratory for Marine Biology and Biotechnology, Qingdao National Oceanography Laboratory, Qingdao, PR China
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Pseudomonas donghuensis sp. nov., exhibiting high-yields of siderophore. Antonie van Leeuwenhoek 2014; 107:83-94. [DOI: 10.1007/s10482-014-0306-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Accepted: 10/14/2014] [Indexed: 10/24/2022]
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Pseudomonas soli sp. nov., a novel producer of xantholysin congeners. Syst Appl Microbiol 2014; 37:412-6. [DOI: 10.1016/j.syapm.2014.07.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 07/03/2014] [Accepted: 07/11/2014] [Indexed: 11/19/2022]
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Chen WJ, Hsieh FC, Hsu FC, Tasy YF, Liu JR, Shih MC. Characterization of an insecticidal toxin and pathogenicity of Pseudomonas taiwanensis against insects. PLoS Pathog 2014; 10:e1004288. [PMID: 25144637 PMCID: PMC4140846 DOI: 10.1371/journal.ppat.1004288] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 06/17/2014] [Indexed: 01/28/2023] Open
Abstract
Pseudomonas taiwanensis is a broad-host-range entomopathogenic bacterium that exhibits insecticidal activity toward agricultural pests Plutella xylostella, Spodoptera exigua, Spodoptera litura, Trichoplusia ni and Drosophila melanogaster. Oral infection with different concentrations (OD = 0.5 to 2) of wild-type P. taiwanensis resulted in insect mortality rates that were not significantly different (92.7%, 96.4% and 94.5%). The TccC protein, a component of the toxin complex (Tc), plays an essential role in the insecticidal activity of P. taiwanensis. The ΔtccC mutant strain of P. taiwanensis, which has a knockout mutation in the tccC gene, only induced 42.2% mortality in P. xylostella, even at a high bacterial dose (OD = 2.0). TccC protein was cleaved into two fragments, an N-terminal fragment containing an Rhs-like domain and a C-terminal fragment containing a Glt symporter domain and a TraT domain, which might contribute to antioxidative stress activity and defense against macrophagosis, respectively. Interestingly, the primary structure of the C-terminal region of TccC in P. taiwanensis is unique among pathogens. Membrane localization of the C-terminal fragment of TccC was proven by flow cytometry. Sonicated pellets of P. taiwanensis ΔtccC strain had lower toxicity against the Sf9 insect cell line and P. xylostella larvae than the wild type. We also found that infection of Sf9 and LD652Y-5d cell lines with P. taiwanensis induced apoptotic cell death. Further, natural oral infection by P. taiwanensis triggered expression of host programmed cell death-related genes JNK-2 and caspase-3.
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Affiliation(s)
- Wen-Jen Chen
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan; Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
| | - Feng-Chia Hsieh
- Biopesticide Division, Taiwan Agricultural Chemicals and Toxic Substances Research Institute, Council of Agriculture, Taichung, Taiwan
| | - Fu-Chiun Hsu
- Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan
| | - Yi-Fang Tasy
- Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan
| | - Je-Ruei Liu
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan; Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
| | - Ming-Che Shih
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan; Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
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Pseudomonas hunanensis sp. nov., Isolated from Soil Subjected to Long-Term Manganese Pollution. Curr Microbiol 2014; 69:19-24. [DOI: 10.1007/s00284-014-0545-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 01/04/2014] [Indexed: 10/25/2022]
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Zhang JT, Zhou SM, An SW, Chen L, Wang GL. Visceral granulomas in farmed large yellow croaker, Larimichthys crocea (Richardson), caused by a bacterial pathogen, Pseudomonas plecoglossicida. JOURNAL OF FISH DISEASES 2014; 37:113-121. [PMID: 25254273 DOI: 10.1111/jfd.12075] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
An enzootic disease characterized by granulomas in internal organs occurred in cage-farmed large yellow croaker, Larimichthys crocea (Richardson), in April and November 2010, in Ningbo, Zhejiang Province. One bacterial strain, named XSDHY-P, was isolated from the diseased fish and identified by biochemical characterization, fatty acid methyl ester (FAME) analysis and multilocus sequence analysis (MLSA). According to the results obtained from the biochemical tests, FAME analysis and phylogenetic analysis derived from 16S ribosomal RNA, gyrB, oprF, oprI, oprL and rpoD gene sequencing, the bacterial isolate, XSDHY-P, was identified as Pseudomonas plecoglossicida. Moreover, lethal dose, 50% trials were carried out to demonstrate the virulence of XSDHY-P in large yellow croaker when administered at 2.13 9 105 colony-forming units per fish. Visceral granulomas were found in the experimentally infected fish as well as in the naturally infected fish, indicating that P. plecoglossicida is another bacterial pathogen that causes granulomatosis in L. crocea.
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Huang CH, Chang MT, Huang L, Chu WS. The gyrase B gene as a molecular marker to resolve interspecific relationships within the Acetobacter pasteurianus group and a novel target for species-specific PCR. Eur Food Res Technol 2014. [DOI: 10.1007/s00217-013-2076-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Toro M, Ramírez-Bahena MH, Cuesta MJ, Velázquez E, Peix A. Pseudomonas guariconensis sp. nov., isolated from rhizospheric soil. Int J Syst Evol Microbiol 2013; 63:4413-4420. [PMID: 23847284 DOI: 10.1099/ijs.0.051193-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We isolated a bacterial strain designated PCAVU11(T) in the course of a study of phosphate-solubilizing bacteria occurring in rhizospheric soil of Vigna unguiculata (L.) Walp. in Guárico state, Venezuela. The 16S rRNA gene sequence had 99.2 % sequence similarity with respect to the most closely related species, Pseudomonas taiwanensis, and 99.1 % with respect to Pseudomonas entomophila, Pseudomonas plecoglossicida and Pseudomonas monteilii, on the basis of which PCAVU11(T) was classified as representing a member of the genus Pseudomonas. Analysis of the housekeeping genes rpoB, rpoD and gyrB confirmed the phylogenetic affiliation and showed sequence similarities lower than 95 % in all cases with respect to the above-mentioned closest relatives. Strain PCAVU11(T) showed two polar flagella. The respiratory quinone was Q9. The major fatty acids were 16 : 0 (25.7 %), 18 : 1ω7c (20.4 %), 17 : 0 cyclo (11.5 %) and 16 : 1ω7c/15 : 0 iso 2-OH in summed feature 3 (10.8 %). The strain was oxidase-, catalase- and urease-positive, the arginine dihydrolase system was present but nitrate reduction, β-galactosidase production and aesculin hydrolysis were negative. Strain PCAVU11(T) grew at 44 °C and at pH 10. The DNA G+C content was 61.5 mol%. DNA-DNA hybridization results showed values lower than 56 % relatedness with respect to the type strains of the four most closely related species. Therefore, the results of genotypic, phenotypic and chemotaxonomic analyses support the classification of strain PCAVU11(T) as representing a novel species of the genus Pseudomonas, which we propose to name Pseudomonas guariconensis sp. nov. The type strain is PCAVU11(T) ( = LMG 27394(T) = CECT 8262(T)).
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Affiliation(s)
- Marcia Toro
- Laboratorio de Estudios Ambientales, Instituto de Zoología Tropical, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela
| | - Martha-Helena Ramírez-Bahena
- Unidad Asociada Grupo de Interacción Planta-Microorganismo, Universidad de Salamanca-IRNASA (CSIC), Spain.,Instituto de Recursos Naturales y Agrobiología. IRNASA-CSIC, Salamanca, Spain
| | - Maria José Cuesta
- Instituto de Recursos Naturales y Agrobiología. IRNASA-CSIC, Salamanca, Spain
| | - Encarna Velázquez
- Departamento de Microbiología y Génetica, Universidad de Salamanca, Spain.,Unidad Asociada Grupo de Interacción Planta-Microorganismo, Universidad de Salamanca-IRNASA (CSIC), Spain
| | - Alvaro Peix
- Unidad Asociada Grupo de Interacción Planta-Microorganismo, Universidad de Salamanca-IRNASA (CSIC), Spain.,Instituto de Recursos Naturales y Agrobiología. IRNASA-CSIC, Salamanca, Spain
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Taxonomic characterisation of Pseudomonas strain L48 and formal proposal of Pseudomonas entomophila sp. nov. Syst Appl Microbiol 2012; 35:145-9. [DOI: 10.1016/j.syapm.2011.12.003] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 12/09/2011] [Accepted: 12/09/2011] [Indexed: 11/23/2022]
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Zhang L, Xi L, Ruan J, Huang Y. Micromonospora yangpuensis sp. nov., isolated from a sponge. Int J Syst Evol Microbiol 2012; 62:272-278. [DOI: 10.1099/ijs.0.029439-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
An actinomycete, strain FXJ6.011T, was isolated from a cup-shaped sponge collected at Dachan reef, Yangpu in the South China Sea. The strain had morphological characteristics of members of the family Micromonosporaceae. Phylogenetic analysis of the 16S rRNA gene sequence of strain FXJ6.011T indicated the highest similarity (98.7 %) to Micromonospora auratinigra JCM 12357T, Micromonospora chaiyaphumensis JCM 12873T and Micromonospora echinofusca JCM 3327T. Analysis of the gyrB gene sequence also showed that strain FXJ6.011T should be assigned to the genus Micromonospora. It contained dd-diaminopimelic acid as the major cell-wall diamino acid and MK-10(H2) as predominant menaquinone. The polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylinositol, phosphatidyl mannosides and phosphatidylinositol dimannoside. The major cellular fatty acids were iso-C16 : 0, C17 : 1ω8c and C16 : 0. Physiological and biochemical data and low DNA–DNA relatedness values enabled the strain to be differentiated from members of closely related species. Based on phenotypic and genotypic data, strain FXJ6.011T represents a novel Micromonospora species, for which the name Micromonospora yangpuensis sp. nov. is proposed; the type strain is FXJ6.011T ( = CGMCC 4.5736T = NBRC 107727T).
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Affiliation(s)
- Limin Zhang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Lijun Xi
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Jisheng Ruan
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Ying Huang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
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Isolation and characterization of ethylbenzene degrading Pseudomonas putida E41. J Microbiol 2011; 49:575-84. [PMID: 21887640 DOI: 10.1007/s12275-011-0399-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Accepted: 03/26/2011] [Indexed: 10/17/2022]
Abstract
Pseudomonas putida E41 was isolated from oil-contaminated soil and showed its ability to grow on ethyl-benzene as the sole carbon and energy source. Moreover, P. putida E41 show the activity of biodegradation of ethylbenzene in the batch culture. E41 showed high efficiency of biodegradation of ethylbenzene with the optimum conditions (a cell concentration of 0.1 g wet cell weight/L, pH 7.0, 25°C, and ethylbenzene concentration of 50 mg/L) from the results of the batch culture. The maximum degradation rate and specific growth rate (μ(max)) under the optimum conditions were 0.19+0.03 mg/mg-DCW (Dry Cell Weight)/h and 0.87+0.13 h(-1), respectively. Benzene, toluene and ethylbenzene were degraded when these compounds were provided together; however, xylene isomers persisted during degradation by P. putida E41. When using a bioreactor batch system with a binary culture with P. putida BJ10, which was isolated previously in our lab, the degradation rate for benzene and toluene was improved in BTE mixed medium (each initial concentration: 50 mg/L). Almost all of the BTE was degraded within 4 h and 70-80% of m-, p-, and o-xylenes within 11 h in a BTEX mixture (initial concentration: 50 mg/L each). In summary, we found a valuable new strain of P. putida, determined the optimal degradation conditions for this isolate and tested a mixed culture of E41 and BJ10 for its ability to degrade a common sample of mixed contaminants containing benzene, toluene, and xylene.
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Liu JR, Lin YD, Chang ST, Zeng YF, Wang SL. Molecular cloning and characterization of an insecticidal toxin from Pseudomonas taiwanensis. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:12343-9. [PMID: 21062004 DOI: 10.1021/jf103604r] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
An insecticidal toxin gene, tccC, was cloned from the recently discovered novel species Pseudomonas taiwanensis using degenerate PCR and genomic walking. The DNA sequence of the tccC gene (2,940 bp) has an open reading frame encoding 980 amino acids with a calculated molecular weight of 107.93 kDa. The amino acid sequence alignment showed the highest sequence identity (41.2%) with the insecticidal toxin from Pseudomonas entomophila. To examine the insecticidal functionality of the tccC gene product, TccC was heterologously expressed in Escherichia coli as a recombinant His6 fusion protein and purified by immobilized metal ion-affinity chromatography. The recombinant TccC was fed to Drosophila larvae at a concentration of 350 ppm, which induced about 60% mortality within 72 h. The recombinant TccC was stable at pH 7.0 and at 37 °C. When the pH was less than 5.0 or greater than 9.0, or temperature was greater than 55 °C, less than 20% Drosophila larvae mortality was observed. These results prove that Pseudomonas taiwanensis could be used as a source for developing novel biopesticides.
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Affiliation(s)
- Je-Ruei Liu
- Institute of Biotechnology and Department of Animal Science and Technology, National Taiwan University, Taipei, Taiwan
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