1
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Lee Z, Wan J, Shen A, Barnard G. Gene copy number, gene configuration and LC/HC mRNA ratio impact on antibody productivity and product quality in targeted integration CHO cell lines. Biotechnol Prog 2024; 40:e3433. [PMID: 38321634 DOI: 10.1002/btpr.3433] [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: 10/13/2023] [Revised: 12/01/2023] [Accepted: 01/03/2024] [Indexed: 02/08/2024]
Abstract
The augmentation of transgene copy numbers is a prevalent approach presumed to enhance transcriptional activity and product yield. CHO cell lines engineered via targeted integration (TI) offer an advantageous platform for investigating the interplay between gene copy number, mRNA abundance, product yield, and product quality. Our investigation revealed that incrementally elevating the gene copy numbers of both IgG heavy chain (HC) and light chain (LC) concurrently resulted in the attainment of plateaus in mRNA levels and product titers, notably occurring beyond four to five gene copies integrated at the same TI site. Furthermore, maintaining a fixed gene copy number while varying the position of genes within the vector influenced the LC/HC mRNA ratio, which subsequently exerted a substantial impact on product titer. Moreover, manipulation of the LC/HC gene ratio through the introduction of surplus LC gene copies led to heightened LC mRNA expression and a reduction in the levels of high molecular weight species. It is noteworthy that the effects of excess LC on product titer were dependent on the specific molecule under consideration. The strategic utilization of PCR tags enabled precise quantification of transcription from each expression slot within the vector, facilitating the identification of highly expressive and less expressive slots. Collectively, these findings significantly enhance our understanding of stable antibody production in TI CHO cell lines.
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Affiliation(s)
- Zion Lee
- Department of Cell Culture and Bioprocess Operations, Genentech, Inc., San Francisco, California, USA
| | - Jun Wan
- Department of Cell Culture and Bioprocess Operations, Genentech, Inc., San Francisco, California, USA
| | - Amy Shen
- Department of Cell Culture and Bioprocess Operations, Genentech, Inc., San Francisco, California, USA
| | - Gavin Barnard
- Department of Cell Culture and Bioprocess Operations, Genentech, Inc., San Francisco, California, USA
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2
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Shang H, Tan BZ, Dakwa V, D'Agnese E, Stanley RA, Sassi H, Lai YW, Deaker R, Bowman JP. Effect of pre-harvest sanitizer treatments on Listeria survival, sensory quality and bacterial community dynamics on leafy green vegetables grown under commercial conditions. Food Res Int 2023; 173:113341. [PMID: 37803650 DOI: 10.1016/j.foodres.2023.113341] [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: 03/23/2023] [Revised: 07/19/2023] [Accepted: 07/31/2023] [Indexed: 10/08/2023]
Abstract
Leafy green vegetables (LGVs) have large surface areas and can be colonized by various microorganisms including pathogens. In this study, we investigated the effect of pre-harvest sanitizer treatments on the survival of inoculated proxy pathogen Listeria innocua ATCC 33090 and the natural microbial community of mizuna, rocket (arugula), red chard and spinach grown under commercial conditions. Electrolyzed water (e-water), peracetic acid (PAA), and 1-bromo-3-chloro-5-dimethylhydantoin (BCDMH) were tested against water controls. We also observed the subsequent sensorial changes of harvested, bagged LGV leaves over a period of 12 days within chill storage alongside the growth, diversity and structure of bacterial populations determined using 16S rRNA gene amplicon sequencing and total viable counts (TVC). Treatment with PAA resulted in the highest reductions of L. innocua (2.4-5.5 log units) compared to the other treatments (0.25-2.5 log units). On day 0 (24 h after sanitizer application), the TVC on sanitizer treated LGVs were significantly reduced compared to water controls, except for rocket. During storage at 4.5 (±0.5)°C sanitisers only hindered microbial growth on LGVs initially and did not influence final bacterial population levels, growth rates or changes in LGV sample colour, decay, odour and texture compared to water controls. Shelf-life was not extended nor was it reduced. The community structure on LGV types differed though a core set of bacterial amplicon sequence variants (ASV) were present across all samples. No significant differences were observed in bacterial diversity between sanitizer treatments, however sanitizer treated LGV samples had initially reduced diversity compared to water treated samples. The bacterial compositions observed at the end point of storage considerably differed from what was observed at initial point owing to the increase in abundance of specific bacterial taxa, mainly Pseudomonas spp., the abundance and growth responses differing between LGV types studied. This study provides a better understanding on the microbiology and sensory impact of pre-harvest applied sanitiser treatments on different LGVs destined for commercial food use.
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Affiliation(s)
- Hongshan Shang
- School of Life and Environmental Sciences, F22 - LEES Building, The University of Sydney, NSW 2006, Australia; Centre for Food Safety and Innovation, Tasmanian Institute of Agriculture, University of Tasmania, Sandy Bay, Tasmania 7005, Australia
| | - Bi Zheng Tan
- Centre for Food Safety and Innovation, Tasmanian Institute of Agriculture, University of Tasmania, Sandy Bay, Tasmania 7005, Australia
| | - Vongai Dakwa
- Centre for Food Safety and Innovation, Tasmanian Institute of Agriculture, University of Tasmania, Sandy Bay, Tasmania 7005, Australia
| | - Erin D'Agnese
- Centre for Food Safety and Innovation, Tasmanian Institute of Agriculture, University of Tasmania, Sandy Bay, Tasmania 7005, Australia
| | - Roger A Stanley
- Centre for Food Safety and Innovation, Tasmanian Institute of Agriculture, University of Tasmania, Sandy Bay, Tasmania 7005, Australia
| | - Hannah Sassi
- School of Life and Environmental Sciences, F22 - LEES Building, The University of Sydney, NSW 2006, Australia
| | - Yu-Wen Lai
- School of Life and Environmental Sciences, F22 - LEES Building, The University of Sydney, NSW 2006, Australia
| | - Rosalind Deaker
- School of Life and Environmental Sciences, F22 - LEES Building, The University of Sydney, NSW 2006, Australia
| | - John P Bowman
- Centre for Food Safety and Innovation, Tasmanian Institute of Agriculture, University of Tasmania, Sandy Bay, Tasmania 7005, Australia.
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3
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Kiousi DE, Karadedos DM, Sykoudi A, Repanas P, Kamarinou CS, Argyri AA, Galanis A. Development of a Multiplex PCR Assay for Efficient Detection of Two Potential Probiotic Strains Using Whole Genome-Based Primers. Microorganisms 2023; 11:2553. [PMID: 37894211 PMCID: PMC10609308 DOI: 10.3390/microorganisms11102553] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/02/2023] [Accepted: 10/11/2023] [Indexed: 10/29/2023] Open
Abstract
Probiotics are microorganisms that exert strain-specific health-promoting effects on the host. Τhey are employed in the production of functional dairy or non-dairy food products; still, their detection in these complex matrices is a challenging task. Several culture-dependent and culture-independent methods have been developed in this direction; however, they present low discrimination at the strain level. Here, we developed a multiplex PCR assay for the detection of two potential probiotic lactic acid bacteria (LAB) strains, Lactiplantibacillus plantarum L125 and Lp. pentosus L33, in monocultures and yogurt samples. Unique genomic regions were identified via comparative genomic analysis and were used to produce strain-specific primers. Then, primer sets were selected that produced distinct electrophoretic DNA banding patterns in multiplex PCR for each target strain. This method was further implemented for the detection of the two strains in yogurt samples, highlighting its biotechnological applicability. Moreover, it can be applied with appropriate modifications to detect any bacterial strain with available WGS.
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Affiliation(s)
- Despoina E. Kiousi
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, 68100 Alexandroupolis, Greece; (D.E.K.); (D.M.K.); (A.S.); (P.R.); (C.S.K.)
| | - Dimitrios M. Karadedos
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, 68100 Alexandroupolis, Greece; (D.E.K.); (D.M.K.); (A.S.); (P.R.); (C.S.K.)
| | - Anastasia Sykoudi
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, 68100 Alexandroupolis, Greece; (D.E.K.); (D.M.K.); (A.S.); (P.R.); (C.S.K.)
| | - Panagiotis Repanas
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, 68100 Alexandroupolis, Greece; (D.E.K.); (D.M.K.); (A.S.); (P.R.); (C.S.K.)
| | - Christina S. Kamarinou
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, 68100 Alexandroupolis, Greece; (D.E.K.); (D.M.K.); (A.S.); (P.R.); (C.S.K.)
- Institute of Technology of Agricultural Products, Hellenic Agricultural Organization—DIMITRA, 14123 Lycovrissi, Greece;
| | - Anthoula A. Argyri
- Institute of Technology of Agricultural Products, Hellenic Agricultural Organization—DIMITRA, 14123 Lycovrissi, Greece;
| | - Alex Galanis
- Department of Molecular Biology and Genetics, Faculty of Health Sciences, Democritus University of Thrace, 68100 Alexandroupolis, Greece; (D.E.K.); (D.M.K.); (A.S.); (P.R.); (C.S.K.)
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Rosić I, Nikolić I, Ranković T, Anteljević M, Medić O, Berić T, Stanković S. Genotyping-driven diversity assessment of biocontrol potent Bacillus spp. strain collection as a potential method for the development of strain-specific biomarkers. Arch Microbiol 2023; 205:114. [PMID: 36907935 DOI: 10.1007/s00203-023-03460-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 02/01/2023] [Accepted: 03/01/2023] [Indexed: 03/14/2023]
Abstract
Bacillus species are among the most researched and frequently applied biocontrol agents. To estimate their potential as environmentally friendly microbial-based products, reliable and rapid plant colonization monitoring methods are essential. We evaluated repetitive element-based (rep) and Random Amplified Polymorphic DNA (RAPD) PCR (Polymerase Chain Reaction) genotyping in a diversity assessment of 251 strains from bulk soil, straw, and manure samples across Serbia, highlighting their discriminative force and the presence of unique bands. RAPD 272, OPG 5, and (GTG)5 primers were most potent in revealing the high diversity of a sizable environmental Bacillus spp. collection. RAPD 272 also amplified a unique band for a proven biocontrol strain, opening the possibility of Sequence Characterized Amplified Region (SCAR) marker design. That will enable colonization studies using the SCAR marker for its specific detection. This study provides a guide for primer selection for diversity and monitoring studies of environmental Bacillus spp. isolates.
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Affiliation(s)
- Iva Rosić
- University of Belgrade - Faculty of Biology, Center for Biological Control and Plant Growth Promotion, University of Belgrade, Studentski Trg 16, 11000, Belgrade, Serbia.
| | - Ivan Nikolić
- University of Belgrade - Faculty of Biology, Center for Biological Control and Plant Growth Promotion, University of Belgrade, Studentski Trg 16, 11000, Belgrade, Serbia
| | - Tamara Ranković
- University of Belgrade - Faculty of Biology, Center for Biological Control and Plant Growth Promotion, University of Belgrade, Studentski Trg 16, 11000, Belgrade, Serbia
| | - Marina Anteljević
- University of Belgrade - Faculty of Biology, Center for Biological Control and Plant Growth Promotion, University of Belgrade, Studentski Trg 16, 11000, Belgrade, Serbia
| | - Olja Medić
- University of Belgrade - Faculty of Biology, Center for Biological Control and Plant Growth Promotion, University of Belgrade, Studentski Trg 16, 11000, Belgrade, Serbia
| | - Tanja Berić
- University of Belgrade - Faculty of Biology, Center for Biological Control and Plant Growth Promotion, University of Belgrade, Studentski Trg 16, 11000, Belgrade, Serbia
| | - Slaviša Stanković
- University of Belgrade - Faculty of Biology, Center for Biological Control and Plant Growth Promotion, University of Belgrade, Studentski Trg 16, 11000, Belgrade, Serbia
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Sohn J, Li L, Zhang L, Genco RJ, Falkner KL, Tettelin H, Rowsam AM, Smiraglia DJ, Novak JM, Diaz PI, Sun Y, Kirkwood KL. Periodontal disease is associated with increased gut colonization of pathogenic Haemophilus parainfluenzae in patients with Crohn's disease. Cell Rep 2023; 42:112120. [PMID: 36774550 PMCID: PMC10415533 DOI: 10.1016/j.celrep.2023.112120] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 11/19/2022] [Accepted: 01/30/2023] [Indexed: 02/13/2023] Open
Abstract
Intestinal colonization of the oral bacterium Haemophilus parainfluenzae has been associated with Crohn's disease (CD) severity and progression. This study examines the role of periodontal disease (PD) as a modifier for colonization of H. parainfluenzae in patients with CD and explores the mechanisms behind H. parainfluenzae-mediated intestinal inflammation. Fifty subjects with and without CD were evaluated for the presence of PD, and their oral and fecal microbiomes were characterized. PD is associated with increased levels of H. parainfluenzae strains in subjects with CD. Oral inoculation of H. parainfluenzae elicits strain-dependent intestinal inflammation in murine models of inflammatory bowel disease, which is associated with increased intestinal interferon-γ (IFN-γ)+ CD4+ T cells and disruption of the host hypusination pathway. In summary, this study establishes a strain-specific pathogenic role of H. parainfluenzae in intestinal inflammation and highlights the potential effect of PD on intestinal colonization by pathogenic H. parainfluenzae strains in patients with CD.
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Affiliation(s)
- Jiho Sohn
- Department of Medicine, State University of New York at Buffalo, University at Buffalo, 645 Biomedical Research Building, 3435 Main Street, Buffalo, NY 14214, USA; Department of Oral Biology, State University of New York at Buffalo, University at Buffalo, Buffalo, NY 14214, USA.
| | - Lu Li
- Department of Oral Biology, State University of New York at Buffalo, University at Buffalo, Buffalo, NY 14214, USA
| | - Lixia Zhang
- Department of Oral Biology, State University of New York at Buffalo, University at Buffalo, Buffalo, NY 14214, USA
| | - Robert J Genco
- Department of Oral Biology, State University of New York at Buffalo, University at Buffalo, Buffalo, NY 14214, USA
| | - Karen L Falkner
- Department of Oral Biology, State University of New York at Buffalo, University at Buffalo, Buffalo, NY 14214, USA
| | - Hervé Tettelin
- Department of Microbiology and Immunology, Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Aryn M Rowsam
- Department of Cell Stress Biology, Reconstructive Surgery Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA
| | - Dominic J Smiraglia
- Department of Cell Stress Biology, Reconstructive Surgery Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA
| | - Jan M Novak
- Department of Medicine, State University of New York at Buffalo, University at Buffalo, 645 Biomedical Research Building, 3435 Main Street, Buffalo, NY 14214, USA
| | - Patricia I Diaz
- Department of Oral Biology, State University of New York at Buffalo, University at Buffalo, Buffalo, NY 14214, USA
| | - Yijun Sun
- Department of Microbiology and Immunology, State University of New York at Buffalo, University at Buffalo, Buffalo, NY 14214, USA
| | - Keith L Kirkwood
- Department of Oral Biology, State University of New York at Buffalo, University at Buffalo, Buffalo, NY 14214, USA; Department of Head & Neck/Plastic & Reconstructive Surgery Roswell Park Comprehensive Cancer Center, Buffalo, NY 14203, USA
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6
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Hernández I, Sant C, Martínez R, Almazán M, Caminal M, Quero V, El-Adak M, Casanova A, Garrido-Jurado I, Yousef-Yousef M, Quesada-Moraga E, Lara JM, Fernández C. Persistence of Metarhizium brunneum (Ascomycota: Hypocreales) in the Soil Is Affected by Formulation Type as Shown by Strain-Specific DNA Markers. J Fungi (Basel) 2023; 9:jof9020229. [PMID: 36836343 PMCID: PMC9966207 DOI: 10.3390/jof9020229] [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: 12/09/2022] [Revised: 01/20/2023] [Accepted: 02/07/2023] [Indexed: 02/12/2023] Open
Abstract
The genus Metarhizium has an increasingly important role in the development of Integrated Pest Control against Tephritid fruit flies in aerial sprays targeting adults and soil treatments targeting preimaginals. Indeed, the soil is considered the main habitat and reservoir of Metarhizium spp., which may be a plant-beneficial microorganism due to its lifestyle as an endophyte and/or rhizosphere-competent fungus. This key role of Metarhizium spp. for eco-sustainable agriculture highlights the priority of developing proper monitoring tools not only to follow the presence of the fungus in the soil and to correlate it with its performance against Tephritid preimaginals but also for risk assessment studies for patenting and registering biocontrol strains. The present study aimed at understanding the population dynamics of M. brunneum strain EAMb 09/01-Su, which is a candidate strain for olive fruit fly Bactrocera oleae (Rossi, 1790) preimaginal control in the soil, when applied to the soil at the field using different formulations and propagules. For this, strain-specific DNA markers were developed and used to track the levels of EAMb 09/01-Su in the soil of 4 field trials. The fungus persists over 250 days in the soil, and the levels of the fungus remained higher when applied as an oil-dispersion formulation than when applied as a wettable powder or encapsulated microsclerotia. Peak concentrations of EAMb 09/01-Su depend on the exogenous input and weakly on environmental conditions. These results will help us to optimize the application patterns and perform accurate risk assessments during further development of this and other entomopathogenic fungus-based bioinsecticides.
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Affiliation(s)
- Iker Hernández
- Futureco Bioscience, Avda. Del Cadí 19-23, 08799 Olèrdola, Spain
- Correspondence: ; Tel.: +34-938182891
| | - Clara Sant
- Futureco Bioscience, Avda. Del Cadí 19-23, 08799 Olèrdola, Spain
| | - Raquel Martínez
- Futureco Bioscience, Avda. Del Cadí 19-23, 08799 Olèrdola, Spain
| | - Marta Almazán
- Futureco Bioscience, Avda. Del Cadí 19-23, 08799 Olèrdola, Spain
| | - Marta Caminal
- Futureco Bioscience, Avda. Del Cadí 19-23, 08799 Olèrdola, Spain
| | - Víctor Quero
- Futureco Bioscience, Avda. Del Cadí 19-23, 08799 Olèrdola, Spain
| | - Mohammed El-Adak
- Futureco Bioscience, Avda. Del Cadí 19-23, 08799 Olèrdola, Spain
| | - Albert Casanova
- Futureco Bioscience, Avda. Del Cadí 19-23, 08799 Olèrdola, Spain
| | | | | | | | - José Manuel Lara
- Futureco Bioscience, Avda. Del Cadí 19-23, 08799 Olèrdola, Spain
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Lee G, Choi H, Liu H, Han YH, Paul NC, Han GH, Kim H, Kim PI, Seo SI, Song J, Sang H. Biocontrol of the causal brown patch pathogen Rhizoctonia solani by Bacillus velezensis GH1-13 and development of a bacterial strain specific detection method. FRONTIERS IN PLANT SCIENCE 2023; 13:1091030. [PMID: 36699832 PMCID: PMC9868939 DOI: 10.3389/fpls.2022.1091030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Accepted: 12/19/2022] [Indexed: 06/17/2023]
Abstract
Brown patch caused by the basidiomycete fungus Rhizoctonia solani is an economically important disease of cool-season turfgrasses. In order to manage the disease, different types of fungicides have been applied, but the negative impact of fungicides on the environment continues to rise. In this study, the beneficial bacteria Bacillus velezensis GH1-13 was characterized as a potential biocontrol agent to manage brown patch disease. The strain GH1-13 strongly inhibited the mycelial growth of turf pathogens including different anastomosis groups of R. solani causing brown patch and large patch. R. solani AG2-2(IIIB) hyphae were morphologically changed, and fungal cell death resulted from exposure to the strain GH1-13. In addition, the compatibility of fungicides with the bacterial strain, and the combined application of fungicide azoxystrobin and the strain in brown patch control on creeping bentgrass indicated that the strain could serve as a biocontrol agent. To develop strain-specific detection method, two unique genes from chromosome and plasmid of GH1-13 were found using pan-genome analysis of 364 Bacillus strains. The unique gene from chromosome was successfully detected using both SYBR Green and TaqMan qPCR methods in bacterial DNA or soil DNA samples. This study suggests that application of GH1-13 offers an environmentally friendly approach via reducing fungicide application rates. Furthermore, the developed pipeline of strain-specific detection method could be a useful tool for detecting and studying the dynamics of specific biocontrol agents.
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Affiliation(s)
- Gahee Lee
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Gwangju, Republic of Korea
| | - Hyeongju Choi
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Gwangju, Republic of Korea
| | - Haifeng Liu
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Gwangju, Republic of Korea
| | - Yun-Hyeong Han
- Division of Food and Biotechnology, Chonnam National University, Gwangju, Republic of Korea
- Damyang-gun Agricultural Technology Center, Damyang, Republic of Korea
| | - Narayan Chandra Paul
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Gwangju, Republic of Korea
- Kumho Life Science Laboratory, Chonnam National University, Gwangju, Republic of Korea
| | - Gui Hwan Han
- Center for Industrialization of Agricultural and Livestock Microorganisms, Jeongeup, Republic of Korea
| | | | - Pyoung Il Kim
- Center for Industrialization of Agricultural and Livestock Microorganisms, Jeongeup, Republic of Korea
| | - Sun-Il Seo
- Center for Industrialization of Agricultural and Livestock Microorganisms, Jeongeup, Republic of Korea
| | - Jaekyeong Song
- Agricultural Microbiology Division, National Institute of Agricultural Sciences, Rural Development Administration, Wanju, Republic of Korea
| | - Hyunkyu Sang
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Gwangju, Republic of Korea
- Division of Food and Biotechnology, Chonnam National University, Gwangju, Republic of Korea
- Kumho Life Science Laboratory, Chonnam National University, Gwangju, Republic of Korea
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8
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Martínez-Servat S, Pinyol-Escala L, Daura-Pich O, Almazán M, Hernández I, López-García B, Fernández C. Characterization of Lysobacter enzymogenes B25, a potential biological control agent of plant-parasitic nematodes, and its mode of action. AIMS Microbiol 2023; 9:151-176. [PMID: 36891531 PMCID: PMC9988411 DOI: 10.3934/microbiol.2023010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 02/16/2023] [Accepted: 02/22/2023] [Indexed: 03/05/2023] Open
Abstract
It is certainly difficult to estimate productivity losses due to the action of phytopathogenic nematodes but it might be about 12 % of world agricultural production. Although there are numerous tools to reduce the effect of these nematodes, there is growing concern about their environmental impact. Lysobacter enzymogenes B25 is an effective biological control agent against plant-parasitic nematodes, showing control over root-knot nematodes (RKN) such as Meloidogyne incognita and Meloidogyne javanica. In this paper, the efficacy of B25 to control RKN infestation in tomato plants (Solanum lycopersicum cv. Durinta) is described. The bacterium was applied 4 times at an average of concentration around 108 CFU/mL showing an efficacy of 50-95 % depending on the population and the pressure of the pathogen. Furthermore, the control activity of B25 was comparable to that of the reference chemical used. L. enzymogenes B25 is hereby characterized, and its mode of action studied, focusing on different mechanisms that include motility, the production of lytic enzymes and secondary metabolites and the induction of plant defenses. The presence of M. incognita increased the twitching motility of B25. In addition, cell-free supernatants obtained after growing B25, in both poor and rich media, showed efficacy in inhibiting RKN egg hatching in vitro. This nematicidal activity was sensitive to high temperatures, suggesting that it is mainly due to extracellular lytic enzymes. The secondary metabolites heat-stable antifungal factor and alteramide A/B were identified in the culture filtrate and their contribution to the nematicidal activity of B25 is discussed. This study points out L. enzymogenes B25 as a promising biocontrol microorganism against nematode infestation of plants and a good candidate to develop a sustainable nematicidal product.
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Affiliation(s)
| | | | | | - Marta Almazán
- Futureco Bioscience, S.A, Olèrdola, Barcelona, Spain
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9
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Vidal LG, Armengol EP, Bella CG, Galimany JC, Gustems CD, Sebastian EB, Vidal XE. Biocontrol of grapevine diseases. BIO WEB OF CONFERENCES 2023. [DOI: 10.1051/bioconf/20235601014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023] Open
Abstract
In 2018, work began on the project: Alternative protection of interregional plant production in the Pyrenees (PALVIP). A project whose main objective was the study of compounds of biological origin for the control of pests and diseases in vineyards and fruit trees. Participants in the project: Chambre d'agriculture Pyrénées orientales, INCAVI, University of Girona, Autonomous University of Barcelona, University of Perpinyà, and the companies Akinao and Futureco Bioscience. INCAVI focused on efficacy studies in the control of powdery mildew and downy mildew in field applications. Work has been done with microorganisms (bacteria) and plant extracts that have a biocidal or competitive action on the parasitic fungus and/or the ability to stimulate natural defenses. Interesting results have been obtained in the complementary use of the materials studied with those of reference: they allow to reduce the copper doses in the control of downy mildew or obtain good efficacy in the control of powdery mildew. PALVIP represents a further step in the progress towards organic growing vines with respect for the environment, improvement of working conditions and improvement of wines, basic objectives of current viticulture.
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10
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Rosenberg E, Zilber-Rosenberg I. Reconstitution and Transmission of Gut Microbiomes and Their Genes between Generations. Microorganisms 2021; 10:microorganisms10010070. [PMID: 35056519 PMCID: PMC8780831 DOI: 10.3390/microorganisms10010070] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/26/2021] [Accepted: 12/28/2021] [Indexed: 12/13/2022] Open
Abstract
Microbiomes are transmitted between generations by a variety of different vertical and/or horizontal modes, including vegetative reproduction (vertical), via female germ cells (vertical), coprophagy and regurgitation (vertical and horizontal), physical contact starting at birth (vertical and horizontal), breast-feeding (vertical), and via the environment (horizontal). Analyses of vertical transmission can result in false negatives (failure to detect rare microbes) and false positives (strain variants). In humans, offspring receive most of their initial gut microbiota vertically from mothers during birth, via breast-feeding and close contact. Horizontal transmission is common in marine organisms and involves selectivity in determining which environmental microbes can colonize the organism's microbiome. The following arguments are put forth concerning accurate microbial transmission: First, the transmission may be of functions, not necessarily of species; second, horizontal transmission may be as accurate as vertical transmission; third, detection techniques may fail to detect rare microbes; lastly, microbiomes develop and reach maturity with their hosts. In spite of the great variation in means of transmission discussed in this paper, microbiomes and their functions are transferred from one generation of holobionts to the next with fidelity. This provides a strong basis for each holobiont to be considered a unique biological entity and a level of selection in evolution, largely maintaining the uniqueness of the entity and conserving the species from one generation to the next.
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11
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Hoysted GA, Kowal J, Pressel S, Duckett JG, Bidartondo MI, Field KJ. Carbon for nutrient exchange between Lycopodiella inundata and Mucoromycotina fine root endophytes is unresponsive to high atmospheric CO 2. MYCORRHIZA 2021; 31:431-440. [PMID: 33884466 PMCID: PMC8266774 DOI: 10.1007/s00572-021-01033-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 04/14/2021] [Indexed: 05/26/2023]
Abstract
Non-vascular plants associating with arbuscular mycorrhizal (AMF) and Mucoromycotina 'fine root endophyte' (MFRE) fungi derive greater benefits from their fungal associates under higher atmospheric [CO2] (a[CO2]) than ambient; however, nothing is known about how changes in a[CO2] affect MFRE function in vascular plants. We measured movement of phosphorus (P), nitrogen (N) and carbon (C) between the lycophyte Lycopodiella inundata and Mucoromycotina fine root endophyte fungi using 33P-orthophosphate, 15 N-ammonium chloride and 14CO2 isotope tracers under ambient and elevated a[CO2] concentrations of 440 and 800 ppm, respectively. Transfers of 33P and 15 N from MFRE to plants were unaffected by changes in a[CO2]. There was a slight increase in C transfer from plants to MFRE under elevated a[CO2]. Our results demonstrate that the exchange of C-for-nutrients between a vascular plant and Mucoromycotina FRE is largely unaffected by changes in a[CO2]. Unravelling the role of MFRE in host plant nutrition and potential C-for-N trade changes between symbionts under different abiotic conditions is imperative to further our understanding of the past, present and future roles of plant-fungal symbioses in ecosystems.
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Affiliation(s)
- Grace A Hoysted
- Deparment of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK.
| | - Jill Kowal
- Comparative Plant & Fungal Biology, Royal Botanic Gardens, Kew, Richmond, TW9 3DS, UK
| | - Silvia Pressel
- Department of Life Sciences, Natural History Museum, London, SW7 5BD, UK
| | - Jeffrey G Duckett
- Department of Life Sciences, Natural History Museum, London, SW7 5BD, UK
| | - Martin I Bidartondo
- Comparative Plant & Fungal Biology, Royal Botanic Gardens, Kew, Richmond, TW9 3DS, UK
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Katie J Field
- Deparment of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
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