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Ambreetha S, Zincke D, Balachandar D, Mathee K. Genomic and metabolic versatility of Pseudomonas aeruginosa contributes to its inter-kingdom transmission and survival. J Med Microbiol 2024; 73. [PMID: 38362900 DOI: 10.1099/jmm.0.001791] [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] [Indexed: 02/17/2024] Open
Abstract
Pseudomonas aeruginosa is one of the most versatile bacteria with renowned pathogenicity and extensive drug resistance. The diverse habitats of this bacterium include fresh, saline and drainage waters, soil, moist surfaces, taps, showerheads, pipelines, medical implants, nematodes, insects, plants, animals, birds and humans. The arsenal of virulence factors produced by P. aeruginosa includes pyocyanin, rhamnolipids, siderophores, lytic enzymes, toxins and polysaccharides. All these virulent elements coupled with intrinsic, adaptive and acquired antibiotic resistance facilitate persistent colonization and lethal infections in different hosts. To date, treating pulmonary diseases remains complicated due to the chronic secondary infections triggered by hospital-acquired P. aeruginosa. On the contrary, this bacterium can improve plant growth by suppressing phytopathogens and insects. Notably, P. aeruginosa is one of the very few bacteria capable of trans-kingdom transmission and infection. Transfer of P. aeruginosa strains from plant materials to hospital wards, animals to humans, and humans to their pets occurs relatively often. Recently, we have identified that plant-associated P. aeruginosa strains could be pathologically similar to clinical isolates. In this review, we have highlighted the genomic and metabolic factors that facilitate the dominance of P. aeruginosa across different biological kingdoms and the varying roles of this bacterium in plant and human health.
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Affiliation(s)
- Sakthivel Ambreetha
- Developmental Biology and Genetics, Division of Biological Sciences, Indian Institute of Science, Bengaluru, Karnataka, 560012, India
| | - Diansy Zincke
- Emerging Pathogens Institute, University of Florida, Gainesville, FL 32610, USA
| | - Dananjeyan Balachandar
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
| | - Kalai Mathee
- Department of Human and Molecular Genetics, Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA
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Aqueel R, Badar A, Roy N, Mushtaq Q, Ali AF, Bashir A, Ijaz UZ, Malik KA. Cotton microbiome profiling and Cotton Leaf Curl Disease (CLCuD) suppression through microbial consortia associated with Gossypium arboreum. NPJ Biofilms Microbiomes 2023; 9:100. [PMID: 38097579 PMCID: PMC10721634 DOI: 10.1038/s41522-023-00470-9] [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: 08/09/2023] [Accepted: 11/28/2023] [Indexed: 12/17/2023] Open
Abstract
The failure of breeding strategies has caused scientists to shift to other means where the new approach involves exploring the microbiome to modulate plant defense mechanisms against Cotton Leaf Curl Disease (CLCuD). The cotton microbiome of CLCuD-resistant varieties may harbor a multitude of bacterial genera that significantly contribute to disease resistance and provide information on metabolic pathways that differ between the susceptible and resistant varieties. The current study explores the microbiome of CLCuD-susceptible Gossypium hirsutum and CLCuD-resistant Gossypium arboreum using 16 S rRNA gene amplification for the leaf endophyte, leaf epiphyte, rhizosphere, and root endophyte of the two cotton species. This revealed that Pseudomonas inhabited the rhizosphere while Bacillus was predominantly found in the phyllosphere of CLCuV-resistant G. arboreum. Using salicylic acid-producing Serratia spp. and Fictibacillus spp. isolated from CLCuD-resistant G. arboreum, and guided by our analyses, we have successfully suppressed CLCuD in the susceptible G. hirsutum through pot assays. The applied strains exhibited less than 10% CLCuD incidence as compared to control group where it was 40% at 40 days post viral inoculation. Through detailed analytics, we have successfully demonstrated that the applied microbes serve as a biocontrol agent to suppress viral disease in Cotton.
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Affiliation(s)
- Rhea Aqueel
- Kauser Abdulla Malik School of Life Sciences, Forman Christian College (A Chartered University), Ferozepur Road, Lahore, 54600, Pakistan
- Water & Environment Research Group, University of Glasgow, Mazumdar-Shaw Advanced Research Centre, Glasgow, G11 6EW, UK
| | - Ayesha Badar
- Kauser Abdulla Malik School of Life Sciences, Forman Christian College (A Chartered University), Ferozepur Road, Lahore, 54600, Pakistan
| | - Nazish Roy
- Kauser Abdulla Malik School of Life Sciences, Forman Christian College (A Chartered University), Ferozepur Road, Lahore, 54600, Pakistan
| | - Qandeel Mushtaq
- Kauser Abdulla Malik School of Life Sciences, Forman Christian College (A Chartered University), Ferozepur Road, Lahore, 54600, Pakistan
| | - Aimen Fatima Ali
- Kauser Abdulla Malik School of Life Sciences, Forman Christian College (A Chartered University), Ferozepur Road, Lahore, 54600, Pakistan
| | - Aftab Bashir
- Kauser Abdulla Malik School of Life Sciences, Forman Christian College (A Chartered University), Ferozepur Road, Lahore, 54600, Pakistan
| | - Umer Zeeshan Ijaz
- Water & Environment Research Group, University of Glasgow, Mazumdar-Shaw Advanced Research Centre, Glasgow, G11 6EW, UK.
- National University of Ireland, Galway, University Road, Galway, H91 TK33, Ireland.
- Department of Molecular and Clinical Cancer Medicine, University of Liverpool, Liverpool, L69 7BE, UK.
| | - Kauser Abdulla Malik
- Kauser Abdulla Malik School of Life Sciences, Forman Christian College (A Chartered University), Ferozepur Road, Lahore, 54600, Pakistan.
- Pakistan Academy of Sciences, Islamabad, Pakistan.
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Feng R, Wang H, Liu T, Wang F, Cai L, Chen X, Zhang S. Response of microbial communities in the phyllosphere ecosystem of tobacco exposed to the broad-spectrum copper hydroxide. Front Microbiol 2023; 14:1229294. [PMID: 37840714 PMCID: PMC10568630 DOI: 10.3389/fmicb.2023.1229294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 09/11/2023] [Indexed: 10/17/2023] Open
Abstract
Copper hydroxide is a broad-spectrum copper fungicide, which is often used to control crop fungal and bacterial diseases. In addition to controlling targeted pathogens, copper hydroxide may also affect other non-targeted microorganisms in the phyllosphere ecosystem. At four time points (before spraying, and 5, 10 and 15 days after fungicide application), the response of diseased and healthy tobacco phyllosphere microorganisms to copper hydroxide stress was studied by using Illumina high-throughput sequencing technology, and Biolog tools. The results showed that the microbiome communities of the healthy group were more affected than the disease group, and the fungal community was more sensitive than the bacterial community. The most common genera in the disease group were Alternaria, Boeremia, Cladosporium, Pantoea, Ralstonia, Pseudomonas, and Sphingomonas; while in the healthy group, these were Alternaria, Cladosporium, Symmetrospora, Ralstonia, and Pantoea. After spraying, the alpha diversity of the fungal community decreased at 5 days for both healthy and diseased groups, and then showed an increasing trend, with a significant increase at 15 days for the healthy group. The alpha diversity of bacterial community in healthy and diseased groups increased at 15 days, and the healthy group had a significant difference. The relative abundance of Alternaria and Cladosporium decreased while that of Boeremia, Stagonosporopsis, Symmetrospora, Epicoccum and Phoma increased in the fungal communities of healthy and diseased leaves. The relative abundance of Pantoea decreased first and then increased, while that of Ralstonia, Pseudomonas and Sphingomonas increased first and then decreased in the bacterial communities of healthy and diseased leaves. While copper hydroxide reduced the relative abundance of pathogenic fungi Alternaria and Cladosporium, it also resulted in the decrease of beneficial bacteria such as Actinomycetes and Pantoea, and the increase of potential pathogens such as Boeremia and Stagonosporopsis. After treatment with copper hydroxide, the metabolic capacity of the diseased group improved, while that of the healthy group was significantly suppressed, with a gradual recovery of metabolic activity as the application time extended. The results revealed changes in microbial community composition and metabolic function of healthy and diseased tobacco under copper hydroxide stress, providing a theoretical basis for future studies on microecological protection of phyllosphere.
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Affiliation(s)
- Ruichao Feng
- MARA Key Laboratory of Sustainable Crop Production in the Middle Reaches of the Yangtze River (Co- construction by Ministry and Province), Yangtze University, Jingzhou, Hubei, China
- Guizhou Provincial Academician Workstation of Microbiology and Health, Guizhou Academy of Tobacco Science, Guiyang, China
| | - Hancheng Wang
- Guizhou Provincial Academician Workstation of Microbiology and Health, Guizhou Academy of Tobacco Science, Guiyang, China
| | - Tingting Liu
- Guizhou Provincial Academician Workstation of Microbiology and Health, Guizhou Academy of Tobacco Science, Guiyang, China
| | - Feng Wang
- Guizhou Provincial Academician Workstation of Microbiology and Health, Guizhou Academy of Tobacco Science, Guiyang, China
| | - Liuti Cai
- Guizhou Provincial Academician Workstation of Microbiology and Health, Guizhou Academy of Tobacco Science, Guiyang, China
| | - Xingjiang Chen
- Guizhou Provincial Academician Workstation of Microbiology and Health, Guizhou Academy of Tobacco Science, Guiyang, China
| | - Songbai Zhang
- MARA Key Laboratory of Sustainable Crop Production in the Middle Reaches of the Yangtze River (Co- construction by Ministry and Province), Yangtze University, Jingzhou, Hubei, China
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Muangkaew P, De Roo V, Zhou L, Girard L, Cesa-Luna C, Höfte M, De Mot R, Madder A, Geudens N, Martins JC. Stereomeric Lipopeptides from a Single Non-Ribosomal Peptide Synthetase as an Additional Source of Structural and Functional Diversification in Pseudomonas Lipopeptide Biosynthesis. Int J Mol Sci 2023; 24:14302. [PMID: 37762605 PMCID: PMC10531924 DOI: 10.3390/ijms241814302] [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: 08/09/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
In Pseudomonas lipopeptides, the D-configuration of amino acids is generated by dedicated, dual-function epimerization/condensation (E/C) domains. The increasing attention to stereochemistry in lipopeptide structure elucidation efforts has revealed multiple examples where epimerization does not occur, even though an E/C-type domain is present. While the origin of the idle epimerization in those E/C-domains remains elusive, epimerization activity has so far shown a binary profile: it is either 'on' (active) or 'off' (inactive). Here, we report the unprecedented observation of an E/C-domain that acts 'on and off', giving rise to the production of two diastereoisomeric lipopeptides by a single non-ribosomal peptide synthetase system. Using dereplication based on solid-phase peptide synthesis and NMR fingerprinting, we first show that the two cyclic lipopeptides produced by Pseudomonas entomophila COR5 correspond to entolysin A and B originally described for P. entomophila L48. Next, we prove that both are diastereoisomeric homologues differing only in the configuration of a single amino acid. This configurational variability is maintained in multiple Pseudomonas strains and typically occurs in a 3:2 ratio. Bioinformatic analysis reveals a possible correlation with the composition of the flanking sequence of the N-terminal secondary histidine motif characteristic for dual-function E/C-type domains. In permeabilization assays, using propidium iodide entolysin B has a higher antifungal activity compared to entolysin A against Botrytis cinerea and Pyricularia oryzae spores. The fact that configurational homologues are produced by the same NRPS system in a Pseudomonas strain adds a new level of structural and functional diversification to those already known from substrate flexibility during the recruitment of the amino acids and fatty acids and underscores the importance of complete stereochemical elucidation of non-ribosomal lipopeptide structures.
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Affiliation(s)
- Penthip Muangkaew
- Organic and Biomimetic Chemistry Research Group, Department of Organic and Macromolecular Chemistry, Faculty of Science, Ghent University, B-9000 Ghent, Belgium; (P.M.); (V.D.R.); (A.M.)
| | - Vic De Roo
- Organic and Biomimetic Chemistry Research Group, Department of Organic and Macromolecular Chemistry, Faculty of Science, Ghent University, B-9000 Ghent, Belgium; (P.M.); (V.D.R.); (A.M.)
- NMR and Structure Analysis Unit, Department of Organic and Macromolecular Chemistry, Faculty of Science, Ghent University, B-9000 Ghent, Belgium
| | - Lu Zhou
- Laboratory of Phytopathology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, B-9000 Ghent, Belgium; (L.Z.); (M.H.)
| | - Léa Girard
- Centre of Microbial and Plant Genetics, Faculty of Bioscience Engineering, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium; (L.G.); (C.C.-L.); (R.D.M.)
| | - Catherine Cesa-Luna
- Centre of Microbial and Plant Genetics, Faculty of Bioscience Engineering, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium; (L.G.); (C.C.-L.); (R.D.M.)
| | - Monica Höfte
- Laboratory of Phytopathology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, B-9000 Ghent, Belgium; (L.Z.); (M.H.)
| | - René De Mot
- Centre of Microbial and Plant Genetics, Faculty of Bioscience Engineering, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium; (L.G.); (C.C.-L.); (R.D.M.)
| | - Annemieke Madder
- Organic and Biomimetic Chemistry Research Group, Department of Organic and Macromolecular Chemistry, Faculty of Science, Ghent University, B-9000 Ghent, Belgium; (P.M.); (V.D.R.); (A.M.)
| | - Niels Geudens
- NMR and Structure Analysis Unit, Department of Organic and Macromolecular Chemistry, Faculty of Science, Ghent University, B-9000 Ghent, Belgium
| | - José C. Martins
- NMR and Structure Analysis Unit, Department of Organic and Macromolecular Chemistry, Faculty of Science, Ghent University, B-9000 Ghent, Belgium
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Gupta AK, Verma J, Srivastava A, Srivastava S, Prasad V. Pseudomonas aeruginosa isolate PM1 effectively controls virus infection and promotes growth in plants. Arch Microbiol 2022; 204:494. [PMID: 35841497 DOI: 10.1007/s00203-022-03105-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 06/05/2022] [Accepted: 06/27/2022] [Indexed: 11/24/2022]
Abstract
A bacterial isolate PM1 obtained from the rhizosphere of healthy plants was identified as Pseudomonas aeruginosa by biochemical characteristics and 16S rRNA gene sequence (GenBank ID OL321133.1). It induced resistance in Nicotiana tabacum cv. Xanthi-nc and Cyamopsis tetragonoloba, against Tobacco mosaic virus (TMV) and Sunn-hemp rosette virus (SRV), respectively. Foliar treatment with isolate PM1 curbed TMV accumulation in susceptible N. tabacum cv. White Burley. PM1 was more effective as a foliar than a root/soil drench treatment, evident through a comparative decrease in ELISA values, and reduced viral RNA accumulation. Foliar and soil drench treatment with PM1 resulted in a disease index of 48 and 86 per cent, and a control rate of 48.9 and 8.5 per cent, respectively. PM1 exhibited phosphate solubilization, produced siderophores, auxins, HCN, and ammonia, all important plant growth-promoting traits. Foliar treatment with PM1 enhanced growth in tobacco, while its volatiles significantly promoted seedling growth in C. tetragonoloba. Of the several metabolites produced by the isolate, many are known contributors to induction of systemic resistance, antibiosis, and growth promotion in plants. Soluble metabolites of PM1 were less effective in inducing antiviral resistance in N. tabacum cv. Xanthi-nc in comparison with its broth culture. PM1 and its metabolites were antagonistic to Gram-positive Bacillus spizizenii and Staphylococcus aureus, and fungi Fusarium oxysporum, Aspergillus niger, and Rhizopus stolonifer. Its volatiles were inhibitory to F. oxysporum and R. stolonifer. Thus, PM1 exhibited considerable potential for further evaluation in plant virus control and production of diverse metabolites of use in agriculture and medicine.
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Affiliation(s)
- Ashish Kumar Gupta
- Molecular Plant Virology Laboratory, Department of Botany, University of Lucknow, Lucknow, 226007, India
| | - Jyoti Verma
- Molecular Plant Virology Laboratory, Department of Botany, University of Lucknow, Lucknow, 226007, India
| | - Aparana Srivastava
- Molecular Plant Virology Laboratory, Department of Botany, University of Lucknow, Lucknow, 226007, India
| | - Shalini Srivastava
- Molecular Plant Virology Laboratory, Department of Botany, University of Lucknow, Lucknow, 226007, India
| | - Vivek Prasad
- Molecular Plant Virology Laboratory, Department of Botany, University of Lucknow, Lucknow, 226007, India.
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Harnessing phytomicrobiome signals for phytopathogenic stress management. J Biosci 2022. [DOI: 10.1007/s12038-021-00240-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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Roca-Couso R, Flores-Félix JD, Rivas R. Mechanisms of Action of Microbial Biocontrol Agents against Botrytis cinerea. J Fungi (Basel) 2021; 7:1045. [PMID: 34947027 PMCID: PMC8707566 DOI: 10.3390/jof7121045] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 11/29/2021] [Accepted: 12/04/2021] [Indexed: 01/20/2023] Open
Abstract
Botrytis cinerea is a phytopathogenic fungus responsible for economic losses from USD 10 to 100 billion worldwide. It affects more than 1400 plant species, thus becoming one of the main threats to the agriculture systems. The application of fungicides has for years been an efficient way to control this disease. However, fungicides have negative environmental consequences that have changed popular opinion and clarified the need for more sustainable solutions. Biopesticides are products formulated based on microorganisms (bacteria or fungi) with antifungal activity through various mechanisms. This review gathers the most important mechanisms of antifungal activities and the microorganisms that possess them. Among the different modes of action, there are included the production of diffusible molecules, both antimicrobial molecules and siderophores; production of volatile organic compounds; production of hydrolytic enzymes; and other mechanisms, such as the competition and induction of systemic resistance, triggering an interaction at different levels and inhibition based on complex systems for the production of molecules and regulation of crop biology. Such a variety of mechanisms results in a powerful weapon against B. cinerea; some of them have been tested and are already used in the agricultural production with satisfactory results.
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Affiliation(s)
- Rocío Roca-Couso
- Department of Microbiology and Genetics, Edificio Departamental de Biología, University of Salamanca, 37007 Salamanca, Spain;
- Institute for Agribiotechnology Research (CIALE), 37185 Salamanca, Spain
| | - José David Flores-Félix
- CICS-UBI–Health Sciences Research Centre, University of Beira Interior, 6201-506 Covilhã, Portugal
| | - Raúl Rivas
- Department of Microbiology and Genetics, Edificio Departamental de Biología, University of Salamanca, 37007 Salamanca, Spain;
- Institute for Agribiotechnology Research (CIALE), 37185 Salamanca, Spain
- Associated Unit, University of Salamanca-CSIC (IRNASA), 37008 Salamanca, Spain
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Oluwabusola ET, Adebisi OO, Reyes F, Acquah KS, De La Cruz M, Mweetwa LL, Rajakulendran JE, Warner DF, Hai D, Ebel R, Jaspars M. Isolation and characterization of new phenolic siderophores with antimicrobial properties from Pseudomonas sp. UIAU-6B. Beilstein J Org Chem 2021; 17:2390-2398. [PMID: 34621401 PMCID: PMC8450953 DOI: 10.3762/bjoc.17.156] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Accepted: 08/30/2021] [Indexed: 01/21/2023] Open
Abstract
Five new phenolic siderophores 1–5 were isolated from the organic extract of a culture broth in a modified SGG medium of Pseudomonas sp. UIAU-6B, obtained from sediments collected from the Oyun river in North Central Nigeria. The structure of the new compounds, pseudomonin A–C (1–3) and pseudomobactin A and B (4 and 5) isolated alongside two known compounds, pseudomonine (6) and salicylic acid (7), were elucidated based on high-resolution mass spectrometry, 1D and 2D NMR analyses. The absolute configuration of the threonine residue in compounds 1–5 was determined by Marfey analysis. The antimicrobial evaluation of compound 4 exhibited the most potent activity against vancomycin-sensitive Enterococcus faecium VS144754, followed by 3 and 5, with MIC values ranging from 8 to 32 µg/mL. Compounds 2 and 3 exhibited moderate activity against Mycobacterium tuberculosis H37Rv, with MIC values of 7.8 and 15.6 µg/mL, respectively. Plausible biosynthetic hypotheses toward the new compounds 1–5 were proposed.
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Affiliation(s)
| | - Olusoji O Adebisi
- Department of Microbiology, Faculty of Life Sciences, University of Ilorin, Kwara State, Ilorin, Nigeria
| | - Fernando Reyes
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Avenida del Conocimiento 34, Parque Tecnoloógico de Ciencias de la Salud, E-18016 Granada, Spain
| | - Kojo S Acquah
- Wellcome Centre for Infectious Diseases Research in Africa, University of Cape Town, Rondebosch, 7701, South Africa
| | - Mercedes De La Cruz
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Avenida del Conocimiento 34, Parque Tecnoloógico de Ciencias de la Salud, E-18016 Granada, Spain
| | - Larry L Mweetwa
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Scotland, UK
| | - Joy E Rajakulendran
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Scotland, UK
| | - Digby F Warner
- Wellcome Centre for Infectious Diseases Research in Africa, University of Cape Town, Rondebosch, 7701, South Africa
| | - Deng Hai
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Scotland, UK
| | - Rainer Ebel
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Scotland, UK
| | - Marcel Jaspars
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Scotland, UK
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Ambreetha S, Marimuthu P, Mathee K, Balachandar D. Rhizospheric and endophytic Pseudomonas aeruginosa in edible vegetable plants share molecular and metabolic traits with clinical isolates. J Appl Microbiol 2021; 132:3226-3248. [PMID: 34608722 DOI: 10.1111/jam.15317] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/28/2021] [Accepted: 09/21/2021] [Indexed: 01/02/2023]
Abstract
AIM Pseudomonas aeruginosa, a leading opportunistic pathogen causing hospital-acquired infections, is also commonly found in agricultural settings. However, there are minimal attempts to examine the molecular and functional attributes shared by agricultural and clinical strains of P. aeruginosa. This study investigates the presence of P. aeruginosa in edible vegetable plants (including salad vegetables) and analyses the evolutionary and metabolic relatedness of the agricultural and clinical strains. METHODS AND RESULTS Eighteen rhizospheric and endophytic P. aeruginosa strains were isolated from cucumber, tomato, eggplant, and chili directly from the farms. The identity of these strains was confirmed using biochemical and molecular assays. The genetic and metabolic traits of these plant-associated P. aeruginosa isolates were compared with clinical strains. DNA fingerprinting and 16S rDNA-based phylogenetic analyses revealed that the plant- and human-associated strains are evolutionarily related. Both agricultural and clinical isolates possessed plant-beneficial properties, including mineral solubilization to release essential nutrients (phosphorous, potassium, and zinc), ammonification, and the ability to release extracellular pyocyanin, siderophore, and indole-3 acetic acid. CONCLUSION These findings suggest that rhizospheric and endophytic P. aeruginosa strains are genetically and functionally analogous to the clinical isolates. In addition, the genotypic and phenotypic traits do not correlate with plant sources or ecosystems. SIGNIFICANCE AND IMPACT OF THE STUDY This study reconfirms that edible plants are the potential source for human and animal transmission of P. aeruginosa.
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Affiliation(s)
- Sakthivel Ambreetha
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India.,Department of Human and Molecular Genetics, Herbert Wertheim College of Medicine, Florida International University, Miami, Florida, USA
| | - Ponnusamy Marimuthu
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India
| | - Kalai Mathee
- Department of Human and Molecular Genetics, Herbert Wertheim College of Medicine, Florida International University, Miami, Florida, USA.,Biomolecular Sciences Institute, Florida International University, Miami, Florida, USA
| | - Dananjeyan Balachandar
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India
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Wang H, Liu R, You MP, Barbetti MJ, Chen Y. Pathogen Biocontrol Using Plant Growth-Promoting Bacteria (PGPR): Role of Bacterial Diversity. Microorganisms 2021; 9:microorganisms9091988. [PMID: 34576883 PMCID: PMC8470069 DOI: 10.3390/microorganisms9091988] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 09/10/2021] [Accepted: 09/15/2021] [Indexed: 11/16/2022] Open
Abstract
A vast microbial community inhabits in the rhizosphere, among which, specialized bacteria known as Plant Growth-Promoting Rhizobacteria (PGPR) confer benefits to host plants including growth promotion and disease suppression. PGPR taxa vary in the ways whereby they curtail the negative effects of invading plant pathogens. However, a cumulative or synergistic effect does not always ensue when a bacterial consortium is used. In this review, we reassess the disease-suppressive mechanisms of PGPR and present explanations and illustrations for functional diversity and/or stability among PGPR taxa regarding these mechanisms. We also provide evidence of benefits when PGPR mixtures, rather than individuals, are used for protecting crops from various diseases, and underscore the critical determinant factors for successful use of PGPR mixtures. Then, we evaluate the challenges of and limitations to achieving the desired outcomes from strain/species-rich bacterial assemblages, particularly in relation to their role for plant disease management. In addition, towards locating additive or synergistic outcomes, we highlight why and how the benefits conferred need to be categorized and quantified when different strains/species of PGPR are used in combinations. Finally, we highlight the critical approaches needed for developing PGPR mixtures with improved efficacy and stability as biocontrols for utilization in agricultural fields.
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Affiliation(s)
- Hao Wang
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences, Xianyang 712100, China;
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Runjin Liu
- Institute of Mycorrhizal Biotechnology, Qingdao Agricultural University, Qingdao 266109, China;
| | - Ming Pei You
- The UWA Institute of Agriculture, and School of Agriculture and Environment, The University of Western Australia, LB 5005, Perth, WA 6009, Australia; (M.P.Y.); (M.J.B.)
| | - Martin J. Barbetti
- The UWA Institute of Agriculture, and School of Agriculture and Environment, The University of Western Australia, LB 5005, Perth, WA 6009, Australia; (M.P.Y.); (M.J.B.)
| | - Yinglong Chen
- The UWA Institute of Agriculture, and School of Agriculture and Environment, The University of Western Australia, LB 5005, Perth, WA 6009, Australia; (M.P.Y.); (M.J.B.)
- Correspondence:
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Portieles R, Xu H, Yue Q, Zhao L, Zhang D, Du L, Gao X, Gao J, Portal Gonzalez N, Santos Bermudez R, Borrás-Hidalgo O. Heat-killed endophytic bacterium induces robust plant defense responses against important pathogens. Sci Rep 2021; 11:12182. [PMID: 34108579 PMCID: PMC8190079 DOI: 10.1038/s41598-021-91837-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 06/02/2021] [Indexed: 02/05/2023] Open
Abstract
Stress caused by pathogens strongly damages plants. Developing products to control plant disease is an important challenge in sustainable agriculture. In this study, a heat-killed endophytic bacterium (HKEB), Bacillus aryabhattai, is used to induce plant defense against fungal and bacterial pathogens, and the main defense pathways used by the HKEB to activate plant defense are revealed. The HKEB induced high protection against different pathogens through the salicylic and jasmonic acid pathways. We report the presence of gentisic acid in the HKEB for the first time. These results show that HKEBs may be a useful tool for the management of plant diseases.
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Affiliation(s)
- Roxana Portieles
- Joint R&D Center of Biotechnology, RETDA, Yota Bio-Engineering Co., Ltd., 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Hongli Xu
- Joint R&D Center of Biotechnology, RETDA, Yota Bio-Engineering Co., Ltd., 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Qiulin Yue
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab of Microbial Engineering, Qilu University of Technology (Shandong Academic of Science), Jinan, People's Republic of China
| | - Lin Zhao
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab of Microbial Engineering, Qilu University of Technology (Shandong Academic of Science), Jinan, People's Republic of China
| | - Dening Zhang
- Joint R&D Center of Biotechnology, RETDA, Yota Bio-Engineering Co., Ltd., 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Lihua Du
- Joint R&D Center of Biotechnology, RETDA, Yota Bio-Engineering Co., Ltd., 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Xiangyou Gao
- Joint R&D Center of Biotechnology, RETDA, Yota Bio-Engineering Co., Ltd., 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Jingyao Gao
- Joint R&D Center of Biotechnology, RETDA, Yota Bio-Engineering Co., Ltd., 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Nayanci Portal Gonzalez
- School of Biological Science and Technology, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan, 250022, Shandong, People's Republic of China
| | - Ramon Santos Bermudez
- School of Biological Science and Technology, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan, 250022, Shandong, People's Republic of China.
| | - Orlando Borrás-Hidalgo
- Joint R&D Center of Biotechnology, RETDA, Yota Bio-Engineering Co., Ltd., 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China.
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab of Microbial Engineering, Qilu University of Technology (Shandong Academic of Science), Jinan, People's Republic of China.
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12
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Mishra AK, Baek KH. Salicylic Acid Biosynthesis and Metabolism: A Divergent Pathway for Plants and Bacteria. Biomolecules 2021; 11:705. [PMID: 34065121 PMCID: PMC8150894 DOI: 10.3390/biom11050705] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 05/06/2021] [Accepted: 05/06/2021] [Indexed: 01/24/2023] Open
Abstract
Salicylic acid (SA) is an active secondary metabolite that occurs in bacteria, fungi, and plants. SA and its derivatives (collectively called salicylates) are synthesized from chorismate (derived from shikimate pathway). SA is considered an important phytohormone that regulates various aspects of plant growth, environmental stress, and defense responses against pathogens. Besides plants, a large number of bacterial species, such as Pseudomonas, Bacillus, Azospirillum, Salmonella, Achromobacter, Vibrio, Yersinia, and Mycobacteria, have been reported to synthesize salicylates through the NRPS/PKS biosynthetic gene clusters. This bacterial salicylate production is often linked to the biosynthesis of small ferric-ion-chelating molecules, salicyl-derived siderophores (known as catecholate) under iron-limited conditions. Although bacteria possess entirely different biosynthetic pathways from plants, they share one common biosynthetic enzyme, isochorismate synthase, which converts chorismate to isochorismate, a common precursor for synthesizing SA. Additionally, SA in plants and bacteria can undergo several modifications to carry out their specific functions. In this review, we will systematically focus on the plant and bacterial salicylate biosynthesis and its metabolism.
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Affiliation(s)
| | - Kwang-Hyun Baek
- Department of Biotechnology, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Korea;
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13
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Jiao X, Takishita Y, Zhou G, Smith DL. Plant Associated Rhizobacteria for Biocontrol and Plant Growth Enhancement. FRONTIERS IN PLANT SCIENCE 2021; 12:634796. [PMID: 33815442 PMCID: PMC8009966 DOI: 10.3389/fpls.2021.634796] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 02/23/2021] [Indexed: 05/20/2023]
Abstract
Crop disease remains a major problem to global food production. Excess use of pesticides through chemical disease control measures is a serious problem for sustainable agriculture as we struggle for higher crop productivity. The use of plant growth promoting rhizobacteria (PGPR) is a proven environment friendly way of controlling plant disease and increasing crop yield. PGPR suppress diseases by directly synthesizing pathogen-antagonizing compounds, as well as by triggering plant immune responses. It is possible to identify and develop PGPR that both suppress plant disease and more directly stimulate plant growth, bringing dual benefit. A number of PGPR have been registered for commercial use under greenhouse and field conditions and a large number of strains have been identified and proved as effective biocontrol agents (BCAs) under environmentally controlled conditions. However, there are still a number of challenges before registration, large-scale application, and adoption of PGPR for the pest and disease management. Successful BCAs provide strong theoretical and practical support for application of PGPR in greenhouse production, which ensures the feasibility and efficacy of PGPR for commercial horticulture production. This could be pave the way for widespread use of BCAs in agriculture, including under field conditions, to assist with both disease management and climate change conditions.
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Affiliation(s)
- Xiurong Jiao
- Institute of Agricultural Science and Technology Development of Yangzhou University, Yangzhou, China
- Joint International Research Laboratory of Agriculture and Agri-product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, China
- Department of Plant Science, Faculty of Agricultural and Environmental Sciences, McGill University, Montreal, QC, Canada
| | - Yoko Takishita
- Department of Plant Science, Faculty of Agricultural and Environmental Sciences, McGill University, Montreal, QC, Canada
| | - Guisheng Zhou
- Institute of Agricultural Science and Technology Development of Yangzhou University, Yangzhou, China
- Joint International Research Laboratory of Agriculture and Agri-product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou, China
| | - Donald L. Smith
- Department of Plant Science, Faculty of Agricultural and Environmental Sciences, McGill University, Montreal, QC, Canada
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14
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Sambyal K, Singh RV. Production of salicylic acid; a potent pharmaceutically active agent and its future prospects. Crit Rev Biotechnol 2021; 41:394-405. [PMID: 33618601 DOI: 10.1080/07388551.2020.1869687] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Salicylic acid is one of the potent pharmaceutical organic acids that have various applications in the medical field. It acts as a plant hormone and helps in plant's growth & defence against pathogens. Beyond its numerous functions in plants, SA has great pharmaceutical importance since it acts as an intermediate for the synthesis of various drugs and dyes e.g. aspirin. At the industrial scale, chemical methods are used for the synthesis of SA but presently, several other sources are available that have the capability to alternate the chemical process which will be a step forward toward green synthesis. Aim of this paper is to provide comprehensive knowledge of SA production and its biological application.
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Affiliation(s)
- Krishika Sambyal
- University Institute of Biotechnology, Chandigarh University, Gharuan, Punjab
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15
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Eichmann R, Richards L, Schäfer P. Hormones as go-betweens in plant microbiome assembly. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 105:518-541. [PMID: 33332645 PMCID: PMC8629125 DOI: 10.1111/tpj.15135] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 12/10/2020] [Accepted: 12/11/2020] [Indexed: 05/04/2023]
Abstract
The interaction of plants with complex microbial communities is the result of co-evolution over millions of years and contributed to plant transition and adaptation to land. The ability of plants to be an essential part of complex and highly dynamic ecosystems is dependent on their interaction with diverse microbial communities. Plant microbiota can support, and even enable, the diverse functions of plants and are crucial in sustaining plant fitness under often rapidly changing environments. The composition and diversity of microbiota differs between plant and soil compartments. It indicates that microbial communities in these compartments are not static but are adjusted by the environment as well as inter-microbial and plant-microbe communication. Hormones take a crucial role in contributing to the assembly of plant microbiomes, and plants and microbes often employ the same hormones with completely different intentions. Here, the function of hormones as go-betweens between plants and microbes to influence the shape of plant microbial communities is discussed. The versatility of plant and microbe-derived hormones essentially contributes to the creation of habitats that are the origin of diversity and, thus, multifunctionality of plants, their microbiota and ultimately ecosystems.
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Affiliation(s)
- Ruth Eichmann
- Institute of Molecular BotanyUlm UniversityUlm89069Germany
| | - Luke Richards
- School of Life SciencesUniversity of WarwickCoventryCV4 7ALUK
| | - Patrick Schäfer
- Institute of Molecular BotanyUlm UniversityUlm89069Germany
- School of Life SciencesUniversity of WarwickCoventryCV4 7ALUK
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16
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Khoshfarman-Borji H, Pahlavan Yali M, Bozorg-Amirkalaee M. Induction of resistance against Brevicoryne brassicae by Pseudomonas putida and salicylic acid in canola. BULLETIN OF ENTOMOLOGICAL RESEARCH 2020; 110:597-610. [PMID: 32252840 DOI: 10.1017/s0007485320000097] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The cabbage aphid, Brevicoryne brassicae L. (Hem: Aphididae), is one of the most serious pests of canola worldwide. In this research, the effects of Pseudomonas putida, salicylic acid (SA), and integrated application of both inducers were studied on the resistance of canola to B. brassicae. In free-choice situation, the number of B. brassicae attracted on canola plants under treatments containing P. putida and SA was significantly lower compared to control plants. In the life table study, pre-adult survival, longevity, reproductive period, and fecundity of this aphid were lowest on plants treated with P. putida + SA. The net reproductive rate (R0), intrinsic rate of population increase (r), and finite rate of increase (λ) of B. brassicae decreased significantly in the following order: control (47.19 offspring, 0.293 and 1.340 day-1), P. putida (16.7 offspring, 0.238 and 1.269 day-1), SA (6.37 offspring, 0.163 and 1.178 day-1), and P. putida + SA (3.24 offspring, 0.112 and 1.119 day-1). Moreover, the beneficial effect of the integrated application of P. putida and SA on plant growth parameters was significantly evident in our study. The highest values of glucosinolates, total phenol, and flavonoids were recorded in P. putida + SA treatment. We concluded that canola plants treated with P. putida + SA are more resistant to the cabbage aphid. These findings demonstrated that SA integrated with P. putida on canola plants act effectively for reducing the population of B. brassicae and can be used in integrated management programs of this pest.
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Affiliation(s)
- H Khoshfarman-Borji
- Department of Plant Protection, Faculty of Agriculture, Shahid Bahonar University, Iran
| | - M Pahlavan Yali
- Department of Plant Protection, Faculty of Agriculture, Shahid Bahonar University, Iran
| | - M Bozorg-Amirkalaee
- Department of Plant Protection, Faculty of Agricultural Sciences, University of Mohaghegh Ardabili, Iran
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17
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Parvin W, Govender N, Othman R, Jaafar H, Rahman M, Wong MY. Phenazine from Pseudomonas aeruginosa UPMP3 induced the host resistance in oil palm (Elaeis guineensis Jacq.)-Ganoderma boninense pathosystem. Sci Rep 2020; 10:15621. [PMID: 32973199 PMCID: PMC7518433 DOI: 10.1038/s41598-020-72156-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 07/31/2020] [Indexed: 11/12/2022] Open
Abstract
Pseudomonas aeruginosa developed its biocontrol agent property through the production of antifungal derivatives, with the phenazine among them. In this study, the applications of crude phenazine synthesized by Pseudomonas aeruginosa UPMP3 and hexaconazole were comparatively evaluated for their effectiveness to suppress basal stem rot infection in artificially G. boninense-challenged oil palm seedlings. A glasshouse experiment under the randomized completely block design was set with the following treatments: non-inoculated seedlings, G. boninense inoculated seedlings, G. boninense inoculated seedlings with 1 mg/ml phenazine application, G. boninense inoculated seedlings with 2 mg/ml phenazine application and G. boninense inoculated seedlings with 0.048 mg/ml hexaconazole application. Seedlings were screened for disease parameters and plant vigour traits (plant height, plant fresh weight, root fresh, and dry weight, stem diameter, and total chlorophyll) at 1-to-4 month post-inoculation (mpi). The application of 2 mg/ml phenazine significantly reduced disease severity (DS) at 44% in comparison to fungicide application (DS = 67%). Plant vigour improved from 1 to 4 mpi and the rate of disease reduction in seedlings with phenazine application (2 mg/ml) was twofold greater than hexaconazole. At 4, 6 and 8 wpi, an up-regulation of chitinase and β-1,3 glucanase genes in seedlings treated with phenazine suggests the involvement of induced resistance in G. boninense-oil palm pathosystem.
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Affiliation(s)
- Waheeda Parvin
- Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Malaysia.
- Bangladesh Forest Research Institute, Chittagong, Bangladesh.
| | - Nisha Govender
- Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia, Bangi, Malaysia
| | - Radziah Othman
- Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Malaysia
| | - Hawa Jaafar
- Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Malaysia
| | - Mahbubur Rahman
- Bangladesh Forest Research Institute, Chittagong, Bangladesh
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Malaysia
| | - Mui-Yun Wong
- Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Malaysia.
- Institute of Plantation Studies, Universiti Putra Malaysia, Serdang, Malaysia.
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18
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Meena M, Swapnil P, Divyanshu K, Kumar S, Harish, Tripathi YN, Zehra A, Marwal A, Upadhyay RS. PGPR-mediated induction of systemic resistance and physiochemical alterations in plants against the pathogens: Current perspectives. J Basic Microbiol 2020; 60:828-861. [PMID: 32815221 DOI: 10.1002/jobm.202000370] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 07/28/2020] [Accepted: 08/02/2020] [Indexed: 12/14/2022]
Abstract
Plant growth-promoting rhizobacteria (PGPR) are diverse groups of plant-associated microorganisms, which can reduce the severity or incidence of disease during antagonism among bacteria and soil-borne pathogens, as well as by influencing a systemic resistance to elicit defense response in host plants. An amalgamation of various strains of PGPR has improved the efficacy by enhancing the systemic resistance opposed to various pathogens affecting the crop. Many PGPR used with seed treatment causes structural improvement of the cell wall and physiological/biochemical changes leading to the synthesis of proteins, peptides, and chemicals occupied in plant defense mechanisms. The major determinants of PGPR-mediated induced systemic resistance (ISR) are lipopolysaccharides, lipopeptides, siderophores, pyocyanin, antibiotics 2,4-diacetylphoroglucinol, the volatile 2,3-butanediol, N-alkylated benzylamine, and iron-regulated compounds. Many PGPR inoculants have been commercialized and these inoculants consequently aid in the improvement of crop growth yield and provide effective reinforcement to the crop from disease, whereas other inoculants are used as biofertilizers for native as well as crops growing at diverse extreme habitat and exhibit multifunctional plant growth-promoting attributes. A number of applications of PGPR formulation are needed to maintain the resistance levels in crop plants. Several microarray-based studies have been done to identify the genes, which are associated with PGPR-induced systemic resistance. Identification of these genes associated with ISR-mediating disease suppression and biochemical changes in the crop plant is one of the essential steps in understanding the disease resistance mechanisms in crops. Therefore, in this review, we discuss the PGPR-mediated innovative methods, focusing on the mode of action of compounds authorized that may be significant in the development contributing to enhance plant growth, disease resistance, and serve as an efficient bioinoculants for sustainable agriculture. The review also highlights current research progress in this field with a special emphasis on challenges, limitations, and their environmental and economic advantages.
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Affiliation(s)
- Mukesh Meena
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, Rajasthan, India.,Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Prashant Swapnil
- Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, India.,Department of Botany, Acharya Narendra Dev College, University of Delhi, New Delhi, India
| | - Kumari Divyanshu
- Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Sunil Kumar
- Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Harish
- Plant Biotechnology Laboratory, Department of Botany, Mohanlal Sukhadia University, Udaipur, Rajasthan, India
| | - Yashoda Nandan Tripathi
- Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Andleeb Zehra
- Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, India
| | - Avinash Marwal
- Department of Biotechnology, Vigyan Bhawan-Block B, New Campus, Mohanlal Sukhadia University, Udaipur, Rajasthan, India
| | - Ram Sanmukh Upadhyay
- Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, India
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19
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Xing Z, Wu X, Zhao J, Zhao X, Zhu X, Wang Y, Fan H, Chen L, Liu X, Duan Y. Isolation and identification of induced systemic resistance determinants from Bacillus simplex Sneb545 against Heterodera glycines. Sci Rep 2020; 10:11586. [PMID: 32665669 PMCID: PMC7360772 DOI: 10.1038/s41598-020-68548-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Accepted: 06/28/2020] [Indexed: 02/08/2023] Open
Abstract
Heterodera glycines is one of the most destructive pathogens of soybean. Soybean seeds coated with Bacillus simplex Sneb545 have shown resistance to H. glycines as a result of induced systemic resistance (ISR) in the plants. In this study, we aimed to identify the resistance-inducing determinants from this B. simplex strain. Combining the ISR bioassay, six ISR-active compounds were isolated from a culture of B. simplex Sneb545 using organic solvent gradient extraction, silica gel column chromatography, Sephadex LH-20 column chromatography, and semi-preparative high-performance liquid chromatography (HPLC), and all systems were based on activity tracking. The compounds were determined as cyclic(Pro-Tyr), cyclic(Val-Pro), cyclic(Leu-Pro), uracil, phenylalanine, and tryptophan using 1H NMR and 13C NMR. In plants from seeds coated with Bacillus simplex Sneb545, these six ISR-active compounds delayed the development of H. glycines in soybean roots. Moreover, cyclic(Pro-Tyr), cyclic(Val-Pro), and tryptophan reduced the number of nematodes in soybean roots. The expression levels of defense-related genes with cyclic(Val-Pro), tryptophan and uracil treatment soybean analysed using Quantitative real-time PCR (qRT-PCR). The results indicate cyclic(Val-Pro), tryptophan and uracil induced the expression of defense-related genes involved in the SA- and JA-pathways to against H. glycines. Our research results provide new agents for the control of H. glycines.
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Affiliation(s)
- Zhifu Xing
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xiaojing Wu
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Jing Zhao
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xuebing Zhao
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xiaofeng Zhu
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Yuanyuan Wang
- College of Biology Science and Technology, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Haiyan Fan
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Lijie Chen
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xiaoyu Liu
- College of Science, Shenyang Agricultural University, Shenyang, Liaoning, China.
| | - Yuxi Duan
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China.
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20
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Understanding Phytomicrobiome: A Potential Reservoir for Better Crop Management. SUSTAINABILITY 2020. [DOI: 10.3390/su12135446] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Recent crop production studies have aimed at an increase in the biotic and abiotic tolerance of plant communities, along with increased nutrient availability and crop yields. This can be achieved in various ways, but one of the emerging approaches is to understand the phytomicrobiome structure and associated chemical communications. The phytomicrobiome was characterized with the advent of high-throughput techniques. Its composition and chemical signaling phenomena have been revealed, leading the way for “rhizosphere engineering”. In addition to the above, phytomicrobiome studies have paved the way to best tackling soil contamination with various anthropogenic activities. Agricultural lands have been found to be unbalanced for crop production. Due to the intense application of agricultural chemicals such as herbicides, fungicides, insecticides, fertilizers, etc., which can only be rejuvenated efficiently through detailed studies on the phytomicrobiome component, the phytomicrobiome has recently emerged as a primary plant trait that affects crop production. The phytomicrobiome also acts as an essential modifying factor in plant root exudation and vice versa, resulting in better plant health and crop yield both in terms of quantity and quality. Not only supporting better plant growth, phytomicrobiome members are involved in the degradation of toxic materials, alleviating the stress conditions that adversely affect plant development. Thus, the present review compiles the progress in understanding phytomicrobiome relationships and their application in achieving the goal of sustainable agriculture.
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21
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Pseudomonas taiwanensis (MTCC11631) mediated induction of systemic resistance in Anthurium andreanum L against blight disease and visualisation of defence related secondary metabolites using confocal laser scanning microscopy. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101561] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Elicitor and Receptor Molecules: Orchestrators of Plant Defense and Immunity. Int J Mol Sci 2020; 21:ijms21030963. [PMID: 32024003 PMCID: PMC7037962 DOI: 10.3390/ijms21030963] [Citation(s) in RCA: 139] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 01/11/2020] [Accepted: 01/13/2020] [Indexed: 02/07/2023] Open
Abstract
Pathogen-associated molecular patterns (PAMPs), microbe-associated molecular patterns (MAMPs), herbivore-associated molecular patterns (HAMPs), and damage-associated molecular patterns (DAMPs) are molecules produced by microorganisms and insects in the event of infection, microbial priming, and insect predation. These molecules are then recognized by receptor molecules on or within the plant, which activates the defense signaling pathways, resulting in plant’s ability to overcome pathogenic invasion, induce systemic resistance, and protect against insect predation and damage. These small molecular motifs are conserved in all organisms. Fungi, bacteria, and insects have their own specific molecular patterns that induce defenses in plants. Most of the molecular patterns are either present as part of the pathogen’s structure or exudates (in bacteria and fungi), or insect saliva and honeydew. Since biotic stresses such as pathogens and insects can impair crop yield and production, understanding the interaction between these organisms and the host via the elicitor–receptor interaction is essential to equip us with the knowledge necessary to design durable resistance in plants. In addition, it is also important to look into the role played by beneficial microbes and synthetic elicitors in activating plants’ defense and protection against disease and predation. This review addresses receptors, elicitors, and the receptor–elicitor interactions where these components in fungi, bacteria, and insects will be elaborated, giving special emphasis to the molecules, responses, and mechanisms at play, variations between organisms where applicable, and applications and prospects.
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23
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Balthazar C, Cantin G, Novinscak A, Joly DL, Filion M. Expression of Putative Defense Responses in Cannabis Primed by Pseudomonas and/or Bacillus Strains and Infected by Botrytis cinerea. FRONTIERS IN PLANT SCIENCE 2020; 11:572112. [PMID: 33324431 PMCID: PMC7723895 DOI: 10.3389/fpls.2020.572112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 11/05/2020] [Indexed: 05/06/2023]
Abstract
Cannabis (Cannabis sativa L.) offers many industrial, agricultural, and medicinal applications, but is commonly threatened by the gray mold disease caused by the fungus Botrytis cinerea. With few effective control measures currently available, the use of beneficial rhizobacteria represents a promising biocontrol avenue for cannabis. To counter disease development, plants rely on a complex network of inducible defense pathways, allowing them to respond locally and systemically to pathogens attacks. In this study, we present the first attempt to control gray mold in cannabis using beneficial rhizobacteria, and the first investigation of cannabis defense responses at the molecular level. Four promising Pseudomonas (LBUM223 and WCS417r) and Bacillus strains (LBUM279 and LBUM979) were applied as single or combined root treatments to cannabis seedlings, which were subsequently infected by B. cinerea. Symptoms were recorded and the expression of eight putative defense genes was monitored in leaves by reverse transcription quantitative polymerase chain reaction. The rhizobacteria did not significantly control gray mold and all infected leaves were necrotic after a week, regardless of the treatment. Similarly, no systemic activation of putative cannabis defense genes was reported, neither triggered by the pathogen nor by the rhizobacteria. However, this work identified five putative defense genes (ERF1, HEL, PAL, PR1, and PR2) that were strongly and sustainably induced locally at B. cinerea's infection sites, as well as two stably expressed reference genes (TIP41 and APT1) in cannabis. These markers will be useful in future researches exploring cannabis defense pathways.
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Affiliation(s)
- Carole Balthazar
- Department of Biology, Université de Moncton, Moncton, NB, Canada
| | - Gabrielle Cantin
- Institute of Health Sciences, Collège La Cité, Ottawa, ON, Canada
| | - Amy Novinscak
- Department of Biology, Université de Moncton, Moncton, NB, Canada
| | - David L. Joly
- Department of Biology, Université de Moncton, Moncton, NB, Canada
| | - Martin Filion
- Department of Biology, Université de Moncton, Moncton, NB, Canada
- Agriculture and Agri-Food Canada, Saint-Jean-sur-Richelieu Research and Development Centre, Saint-Jean-sur-Richelieu, QC, Canada
- *Correspondence: Martin Filion,
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Salicylic Acid-Producing Endophytic Bacteria Increase Nicotine Accumulation and Resistance against Wildfire Disease in Tobacco Plants. Microorganisms 2019; 8:microorganisms8010031. [PMID: 31877906 PMCID: PMC7022923 DOI: 10.3390/microorganisms8010031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 12/16/2019] [Accepted: 12/18/2019] [Indexed: 12/25/2022] Open
Abstract
Endophytic bacteria (EB) are both a novel source of bioactive compounds that confer phytopathogen resistance and inducers of secondary metabolites in host plants. Twenty-seven EB isolated from various parts of Metasequoia glyptostroboides, Ginkgo biloba, Taxus brevifolia, Pinus densiflora, Salix babylonica, and S. chaenomeloides could produce salicylic acid (SA). The highest producers were isolates EB-44 and EB-47, identified as Pseudomonas tremae and Curtobacterium herbarum, respectively. Nicotiana benthamiana grown from EB-44-soaked seeds exhibited a 2.3-fold higher endogenous SA concentration and increased resistance against P. syringae pv. tabaci, the causative agent of tobacco wildfire disease, than plants grown from water-soaked seeds. N benthamiana and N. tabacum grown from EB-44-treated seeds developed 33% and 54% disease lesions, respectively, when infected with P. syringae pv. tabaci, and showed increased height and weight, in addition to 4.6 and 1.4-fold increases in nicotine accumulation, respectively. The results suggest that SA-producing EB-44 can successfully colonize Nicotiana spp., leading to increased endogenous SA production and resistance to tobacco wildfire disease. The newly isolated EB can offer an efficient and eco-friendly solution for controlling wildfire disease and nicotine accumulation in Nicotiana, with additional application for other important crops to increase both productivity and the generation of bioactive compounds.
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Yu K, Liu Y, Tichelaar R, Savant N, Lagendijk E, van Kuijk SJ, Stringlis IA, van Dijken AJ, Pieterse CM, Bakker PA, Haney CH, Berendsen RL. Rhizosphere-Associated Pseudomonas Suppress Local Root Immune Responses by Gluconic Acid-Mediated Lowering of Environmental pH. Curr Biol 2019; 29:3913-3920.e4. [DOI: 10.1016/j.cub.2019.09.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 08/02/2019] [Accepted: 09/06/2019] [Indexed: 10/25/2022]
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De Tender C, Mesuere B, Van der Jeugt F, Haegeman A, Ruttink T, Vandecasteele B, Dawyndt P, Debode J, Kuramae EE. Peat substrate amended with chitin modulates the N-cycle, siderophore and chitinase responses in the lettuce rhizobiome. Sci Rep 2019; 9:9890. [PMID: 31289280 PMCID: PMC6617458 DOI: 10.1038/s41598-019-46106-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 06/19/2019] [Indexed: 11/09/2022] Open
Abstract
Chitin is a valuable peat substrate amendment by increasing lettuce growth and reducing the survival of the zoonotic pathogen Salmonella enterica on lettuce leaves. The production of chitin-catabolic enzymes (chitinases) play a crucial role and are mediated through the microbial community. A higher abundance of plant-growth promoting microorganisms and genera involved in N and chitin metabolism are present in a chitin-enriched substrate. In this study, we hypothesize that chitin addition to peat substrate stimulates the microbial chitinase production. The degradation of chitin leads to nutrient release and the production of small chitin oligomers that are related to plant growth promotion and activation of the plant's defense response. First a shotgun metagenomics approach was used to decipher the potential rhizosphere microbial functions then the nutritional content of the peat substrate was measured. Our results show that chitin addition increases chitin-catabolic enzymes, bacterial ammonium oxidizing and siderophore genes. Lettuce growth promotion can be explained by a cascade degradation of chitin to N-acetylglucosamine and eventually ammonium. The occurrence of increased ammonium oxidizing bacteria, Nitrosospira, and amoA genes results in an elevated concentration of plant-available nitrate. In addition, the increase in chitinase and siderophore genes may have stimulated the plant's systemic resistance.
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Affiliation(s)
- C De Tender
- Flanders Research Institute for Agriculture, Fisheries and Food, Plant Sciences Unit, Burgemeester Van Gansberghelaan 92, 9820, Merelbeke, Belgium.
- Ghent University, Department of Applied Mathematics, Computer Science and Statistics, Krijgslaan 281 S9, 9000, Ghent, Belgium.
| | - B Mesuere
- Ghent University, Department of Applied Mathematics, Computer Science and Statistics, Krijgslaan 281 S9, 9000, Ghent, Belgium
- VIB-UGent Center for Medical Biotechnology, VIB, B-9000, Ghent, Belgium
| | - F Van der Jeugt
- Ghent University, Department of Applied Mathematics, Computer Science and Statistics, Krijgslaan 281 S9, 9000, Ghent, Belgium
| | - A Haegeman
- Flanders Research Institute for Agriculture, Fisheries and Food, Plant Sciences Unit, Burgemeester Van Gansberghelaan 92, 9820, Merelbeke, Belgium
| | - T Ruttink
- Flanders Research Institute for Agriculture, Fisheries and Food, Plant Sciences Unit, Burgemeester Van Gansberghelaan 92, 9820, Merelbeke, Belgium
| | - B Vandecasteele
- Flanders Research Institute for Agriculture, Fisheries and Food, Plant Sciences Unit, Burgemeester Van Gansberghelaan 92, 9820, Merelbeke, Belgium
| | - P Dawyndt
- Ghent University, Department of Applied Mathematics, Computer Science and Statistics, Krijgslaan 281 S9, 9000, Ghent, Belgium
| | - J Debode
- Flanders Research Institute for Agriculture, Fisheries and Food, Plant Sciences Unit, Burgemeester Van Gansberghelaan 92, 9820, Merelbeke, Belgium
| | - E E Kuramae
- Netherlands Institute of Ecology, department of Microbial Ecology, Droevendaalsesteeg 10, 6708 PB, Wageningen, The Netherlands
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Hashem A, Tabassum B, Fathi Abd Allah E. Bacillus subtilis: A plant-growth promoting rhizobacterium that also impacts biotic stress. Saudi J Biol Sci 2019; 26:1291-1297. [PMID: 31516360 PMCID: PMC6734152 DOI: 10.1016/j.sjbs.2019.05.004] [Citation(s) in RCA: 244] [Impact Index Per Article: 48.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 05/18/2019] [Accepted: 05/19/2019] [Indexed: 12/04/2022] Open
Abstract
Plants encounter many biotic agents, such as viruses, bacteria, nematodes, weeds, and arachnids. These entities induce biotic stress in their hosts by disrupting normal metabolism, and as a result, limit plant growth and/or are the cause of plant mortality. Some biotic agents, however, interact symbiotically or synergistically with their host plants. Some microbes can be beneficial to plants and perform the same role as chemical fertilizers and pesticides, acting as a biofertilizer and/or biopesticide. Plant growth promoting rhizobacteria (PGPR) can significantly enhance plant growth and represent a mutually helpful plant-microbe interaction. Bacillus species are a major type of rhizobacteria that can form spores that can survive in the soil for long period of time under harsh environmental conditions. Plant growth is enhanced by PGPR through the induction of systemic resistance, antibiosis, and competitive omission. Thus, the application of microbes can be used to induce systemic resistance in plants against biotic agents and enhance environmental stress tolerance. Bacillus subtilis exhibits both a direct and indirect biocontrol mechanism to suppress disease caused by pathogens. The direct mechanism includes the synthesis of many secondary metabolites, hormones, cell-wall-degrading enzymes, and antioxidants that assist the plant in its defense against pathogen attack. The indirect mechanism includes the stimulation of plant growth and the induction of acquired systemic resistance. Bacillus subtilis can also solubilize soil P, enhance nitrogen fixation, and produce siderophores that promote its growth and suppresses the growth of pathogens. Bacillus subtilis enhances stress tolerance in their plant hosts by inducing the expression of stress-response genes, phytohormones, and stress-related metabolites. The present review discusses the activity of B. subtilis in the rhizosphere, its role as a root colonizer, its biocontrol potential, the associated mechanisms of biocontrol and the ability of B. subtilis to increase crop productivity under conditions of biotic and abiotic stress.
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Key Words
- ABA, abscisic acid
- ACC, 1-aminocyclopropane-1-carboxylate deaminase
- Abiotic stress
- Bacillus subtilis
- Biocontrol mechanism
- Biocontrol potential
- Biotic stress
- GA3, gibberellic acid
- IAA, indole acetic acid
- ISR, induced systemic resistance
- JA, jasmonic acid
- LPs, lipopeptides
- PAL, phenylalanine ammonialyase
- PGP, plant growth promotion
- PGPR, plant growth promoting rhizobacteria
- POD, peroxidase
- PPO, polyphenol oxidase
- Rhizobacteria
- SOD, superoxide dismutase
- VOCs, volatile organic compounds
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Affiliation(s)
- Abeer Hashem
- Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia.,Mycology and Plant Disease Survey Department, Plant Pathology Research Institute, ARC, Giza, Egypt
| | - Baby Tabassum
- Toxicology Laboratory, Department of Zoology, Government Raza PG College, Rampur, UP, India
| | - Elsayed Fathi Abd Allah
- Plant Production Department, College of Food and Agricultural Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia
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Abstract
Bacteria and fungi form complex communities (microbiomes) in above- and below-ground organs of plants, contributing to hosts’ growth and survival in various ways. Recent studies have suggested that host plant genotypes control, at least partly, plant-associated microbiome compositions. However, we still have limited knowledge of how microbiome structures are determined in/on grafted crop plants, whose above-ground (scion) and below-ground (rootstock) genotypes are different with each other. By using eight varieties of grafted tomato plants, we examined how rootstock genotypes could determine the assembly of leaf endophytic microbes in field conditions. An Illumina sequencing analysis showed that both bacterial and fungal community structures did not significantly differ among tomato plants with different rootstock genotypes: rather, sampling positions in the farmland contributed to microbiome variation in a major way. Nonetheless, a further analysis targeting respective microbial taxa suggested that some bacteria and fungi could be preferentially associated with particular rootstock treatments. Specifically, a bacterium in the genus Deinococcus was found disproportionately from ungrafted tomato individuals. In addition, yeasts in the genus Hannaella occurred frequently on the tomato individuals whose rootstock genotype was “Ganbarune”. Overall, this study suggests to what extent leaf microbiome structures can be affected/unaffected by rootstock genotypes in grafted crop plants.
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Sharma S, Kour D, Rana KL, Dhiman A, Thakur S, Thakur P, Thakur S, Thakur N, Sudheer S, Yadav N, Yadav AN, Rastegari AA, Singh K. Trichoderma: Biodiversity, Ecological Significances, and Industrial Applications. RECENT ADVANCEMENT IN WHITE BIOTECHNOLOGY THROUGH FUNGI 2019. [DOI: 10.1007/978-3-030-10480-1_3] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Leibman-Markus M, Pizarro L, Schuster S, Lin ZD, Gershony O, Bar M, Coaker G, Avni A. The intracellular nucleotide-binding leucine-rich repeat receptor (SlNRC4a) enhances immune signalling elicited by extracellular perception. PLANT, CELL & ENVIRONMENT 2018; 41:2313-2327. [PMID: 29790585 PMCID: PMC7266068 DOI: 10.1111/pce.13347] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 05/14/2018] [Accepted: 05/15/2018] [Indexed: 05/04/2023]
Abstract
Plant recognition and defence against pathogens employs a two-tiered perception system. Surface-localized pattern recognition receptors (PRRs) act to recognize microbial features, whereas intracellular nucleotide-binding leucine-rich repeat receptors (NLRs) directly or indirectly recognize pathogen effectors inside host cells. Employing the tomato PRR LeEIX2/EIX model system, we explored the molecular mechanism of signalling pathways. We identified an NLR that can associate with LeEIX2, termed SlNRC4a (NB-LRR required for hypersensitive response-associated cell death-4). Co-immunoprecipitation demonstrates that SlNRC4a is able to associate with different PRRs. Physiological assays with specific elicitors revealed that SlNRC4a generally alters PRR-mediated responses. SlNRC4a overexpression enhances defence responses, whereas silencing SlNRC4 reduces plant immunity. Moreover, the coiled-coil domain of SlNRC4a is able to associate with LeEIX2 and is sufficient to enhance responses upon EIX perception. On the basis of these findings, we propose that SlNRC4a acts as a noncanonical positive regulator of immunity mediated by diverse PRRs. Thus, SlNRC4a could link both intracellular and extracellular immune perceptions.
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Affiliation(s)
| | - Lorena Pizarro
- School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, Israel
| | - Silvia Schuster
- School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, Israel
| | - Z.J. Daniel Lin
- Department of Plant Pathology, University of California, Davis, California
| | - Ofir Gershony
- Department of Plant Pathology and Weed Research ARO, The Volcani Center, Rishon LeZion, Israel
| | - Maya Bar
- Department of Plant Pathology and Weed Research ARO, The Volcani Center, Rishon LeZion, Israel
| | - Gitta Coaker
- Department of Plant Pathology, University of California, Davis, California
| | - Adi Avni
- School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, Israel
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Soto-Rodriguez SA, Lozano-Olvera R, Garcia-Gasca MT, Abad-Rosales SM, Gomez-Gil B, Ayala-Arellano J. Virulence of the fish pathogen Aeromonas dhakensis: genes involved, characterization and histopathology of experimentally infected hybrid tilapia. DISEASES OF AQUATIC ORGANISMS 2018; 129:107-116. [PMID: 29972371 DOI: 10.3354/dao03247] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Aeromonas dhakensis (Ad) CAIM 1873 growth was evaluated at different conditions and antibiotic susceptibility. Mortality and histopathological damages in hybrid tilapia Oreochromis niloticus × O. mossambicus, and virulence factors caused by Ad bacterial cells and extracellular products (ECPs) were evaluated, and the whole genome was obtained. Ad grew between 0.0 and 5.5% NaCl at a pH of between 4 and 10 and from 4 to 37°C. The lowest minimum inhibitory concentration was found for enrofloxacin (<5 µg ml-1), and bacteria were resistant to erythromycin, amoxicillin and ampicillin. Ad bacterial cells (1.86 × 105 cells g-1) and ECPs (0.462 µg protein fish-1) were highly virulent to challenged hybrid tilapia and caused over 80% mortality at 24 h. The primary clinical sign caused was haemorrhage, and damage was most marked in the spleen, liver, kidney and brain of fish challenged with bacterial cells. To our knowledge, this is the first report that Ad causes pyknotic and karyorrhectic nuclei of erythrocytes in the internal organs of hybrid tilapia, which was the most striking histopathological observation. The virulence of Ad to hybrid tilapia may be primarily related to the activity of haemolysins (hlyA genes) and cytotoxins (aerolysin aerA), along with the production of siderophores and proteases. We also found β-lactamase, tetracycline and multiple antibiotic resistance genes, as well as adherence, iron acquisition, toxins (aerolysin family, haemolysins) and diverse protease genes.
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Affiliation(s)
- S A Soto-Rodriguez
- CIAD, AC Mazatlan Unit for Aquaculture and Environmental Management, 82112 Mazatlan, Sinaloa, Mexico
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Maksimov IV, Maksimova TI, Sarvarova ER, Blagova DK, Popov VO. Endophytic Bacteria as Effective Agents of New-Generation Biopesticides (Review). APPL BIOCHEM MICRO+ 2018. [DOI: 10.1134/s0003683818020072] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Etalo D, Jeon JS, Raaijmakers JM. Modulation of plant chemistry by beneficial root microbiota. Nat Prod Rep 2018; 35:398-409. [DOI: 10.1039/c7np00057j] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Beneficial root microbiota modulate plant chemistry and represent an untapped potential to discover new pathways involved in the biosynthesis of high value natural plant products.
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Affiliation(s)
- Desalegn W. Etalo
- Netherlands Institute of Ecology NIOO-KNAW
- Department of Microbial Ecology
- Wageningen
- Netherlands
| | - Je-Seung Jeon
- Netherlands Institute of Ecology NIOO-KNAW
- Department of Microbial Ecology
- Wageningen
- Netherlands
- Institute of Biology
| | - Jos M. Raaijmakers
- Netherlands Institute of Ecology NIOO-KNAW
- Department of Microbial Ecology
- Wageningen
- Netherlands
- Institute of Biology
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Rodriguez-Furlán C, Salinas-Grenet H, Sandoval O, Recabarren C, Arraño-Salinas P, Soto-Alvear S, Orellana A, Blanco-Herrera F. The Root Hair Specific SYP123 Regulates the Localization of Cell Wall Components and Contributes to Rizhobacterial Priming of Induced Systemic Resistance. FRONTIERS IN PLANT SCIENCE 2016; 7:1081. [PMID: 27507978 PMCID: PMC4961009 DOI: 10.3389/fpls.2016.01081] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 07/08/2016] [Indexed: 05/23/2023]
Abstract
Root hairs are important for nutrient and water uptake and are also critically involved the interaction with soil inhabiting microbiota. Root hairs are tubular-shaped outgrowths that emerge from trichoblasts. This polarized elongation is maintained and regulated by a robust mechanism involving the endomembrane secretory and endocytic system. Members of the syntaxin family of SNAREs (soluble N-ethylmaleimide-sensitive factor attachment protein receptor) in plants (SYP), have been implicated in regulation of the fusion of vesicles with the target membranes in both exocytic and endocytic pathways. One member of this family, SYP123, is expressed specifically in the root hairs and accumulated in the growing tip region. This study shows evidence of the SYP123 role in polarized trafficking using knockout insertional mutant plants. We were able to observe defects in the deposition of cell wall proline rich protein PRP3 and cell wall polysaccharides. In a complementary strategy, similar results were obtained using a plant expressing a dominant negative soluble version of SYP123 (SP2 fragment) lacking the transmembrane domain. The evidence presented indicates that SYP123 is also regulating PRP3 protein distribution by recycling by endocytosis. We also present evidence that indicates that SYP123 is necessary for the response of roots to plant growth promoting rhizobacterium (PGPR) in order to trigger trigger induced systemic response (ISR). Plants with a defective SYP123 function were unable to mount a systemic acquired resistance in response to bacterial pathogen infection and ISR upon interaction with rhizobacteria. These results indicated that SYP123 was involved in the polarized localization of protein and polysaccharides in growing root hairs and that this activity also contributed to the establishment of effective plant defense responses. Root hairs represent very plastic structures were many biotic and abiotic factors can affect the number, anatomy and physiology of root hairs. Here, we presented evidence that indicates that interactions with soil PGPR could be closely regulated by signaling involving secretory and/or endocytic trafficking at the root hair tip as a quick way to response to changing environmental conditions.
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Affiliation(s)
- Cecilia Rodriguez-Furlán
- Centro de Biotecnología Vegetal, Facultad de Ciencias Biológicas, Universidad Andrés BelloSantiago, Chile
| | - Hernán Salinas-Grenet
- Centro de Biotecnología Vegetal, Facultad de Ciencias Biológicas, Universidad Andrés BelloSantiago, Chile
| | - Omar Sandoval
- Centro de Biotecnología Vegetal, Facultad de Ciencias Biológicas, Universidad Andrés BelloSantiago, Chile
- FONDAP Center for Genome RegulationSantiago, Chile
| | - Camilo Recabarren
- Centro de Biotecnología Vegetal, Facultad de Ciencias Biológicas, Universidad Andrés BelloSantiago, Chile
- FONDAP Center for Genome RegulationSantiago, Chile
| | - Paulina Arraño-Salinas
- Centro de Biotecnología Vegetal, Facultad de Ciencias Biológicas, Universidad Andrés BelloSantiago, Chile
| | | | - Ariel Orellana
- Centro de Biotecnología Vegetal, Facultad de Ciencias Biológicas, Universidad Andrés BelloSantiago, Chile
- FONDAP Center for Genome RegulationSantiago, Chile
| | - Francisca Blanco-Herrera
- Centro de Biotecnología Vegetal, Facultad de Ciencias Biológicas, Universidad Andrés BelloSantiago, Chile
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Disruption of Transporters Affiliated with Enantio-Pyochelin Biosynthesis Gene Cluster of Pseudomonas protegens Pf-5 Has Pleiotropic Effects. PLoS One 2016; 11:e0159884. [PMID: 27442435 PMCID: PMC4956303 DOI: 10.1371/journal.pone.0159884] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 07/08/2016] [Indexed: 12/22/2022] Open
Abstract
Pseudomonas protegens Pf-5 (formerly Pseudomonas fluorescens) is a biocontrol bacterium that produces the siderophore enantio-pyochelin under conditions of iron starvation in a process that is often accompanied by the secretion of its biosynthesis intermediates, salicylic acid and dihydroaeruginoic acid. In this study, we investigated whether several transporters that are encoded by genes within or adjacent to the enantio-pyochelin biosynthetic cluster, serve as efflux systems for enantio-pyochelin and/or its intermediates. In addition, we determined whether these transporters have broad substrates range specificity using a Phenotype Microarray system. Intriguingly, knockouts of the pchH and fetF transporter genes resulted in mutant strains that secrete higher levels of enantio-pyochelin as well as its intermediates salicylic acid and dihydroaeruginoic acid. Analyses of these mutants did not indicate significant change in transcription of biosynthetic genes involved in enantio-pyochelin production. In contrast, the deletion mutant of PFL_3504 resulted in reduced transcription of the biosynthetic genes as well as decreased dihydroaeruginoic acid concentrations in the culture supernatant, which could either point to regulation of gene expression by the transporter or its role in dihydroaeruginoic acid transport. Disruption of each of the transporters resulted in altered stress and/or chemical resistance profile of Pf-5, which may reflect that these transporters could have specificity for rather a broad range of substrates.
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Zhang F, Ge H, Zhang F, Guo N, Wang Y, Chen L, Ji X, Li C. Biocontrol potential of Trichoderma harzianum isolate T-aloe against Sclerotinia sclerotiorum in soybean. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2016; 100:64-74. [PMID: 26774866 DOI: 10.1016/j.plaphy.2015.12.017] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 12/28/2015] [Accepted: 12/28/2015] [Indexed: 05/01/2023]
Abstract
Sclerotinia stem rot, caused by Sclerotinia sclerotiorum (Lib.) de Bary is a major disease of soybean (Glycine max (L.) Merr.). At present, we revealed the three-way interaction between Trichoderma harzianum T-aloe, pathogen S. sclerotiorum and soybean plants in order to demonstrate biocontrol mechanism and evaluate biocontrol potential of T-aloe against S. sclerotiorum in soybean. In our experiments, T-aloe inhibited the growth of S. sclerotiorum with an efficiency of 56.3% in dual culture tests. T-aloe hyphae grew in parallel or intertwined with S. sclerotiorum hyphae and produced hooked contact branches, indicating mycoparasitism. Plate tests showed that T-aloe culture filtrate inhibited S. sclerotiorum growth with an inhibition efficiency of 51.2% and sclerotia production. T-aloe pretreatment showed growth-promoting effect on soybean plants. The activities of peroxidase, superoxide dismutase, and catalase increased, and the hydrogen peroxide (H2O2) as well as the superoxide radical (O2(-)) content in soybean leaves decreased after T-aloe pretreatment in response to S. sclerotiorum pathogen challenge. T-aloe treatment diminished damage caused by pathogen stress on soybean leaf cell membrane, and increased chlorophyll as well as total phenol contents. The defense-related genes PR1, PR2, and PR3 were expressed in the leaves of T-aloe-treated plants. In summary, T-aloe displayed biocontrol potential against S. sclerotiorum. This is the first report of unraveling biocontrol potential of Trichoderma Spp. to soybean sclerotinia stem rot from the three-way interaction between the biocontrol agent, pathogen S. sclerotiorum and soybean plants.
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Affiliation(s)
- Fuli Zhang
- Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences, Xinjiang 830011, China; College of Life Science and Agronomy, ZhouKou Normal University, ZhouKou 466001, China.
| | - Honglian Ge
- College of Life Science and Agronomy, ZhouKou Normal University, ZhouKou 466001, China
| | - Fan Zhang
- College of Life Science and Agronomy, ZhouKou Normal University, ZhouKou 466001, China
| | - Ning Guo
- College of Life Science and Agronomy, ZhouKou Normal University, ZhouKou 466001, China
| | - Yucheng Wang
- Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences, Xinjiang 830011, China; School of Forestry, Northeast Forestry University, Harbin 150040, China
| | - Long Chen
- College of Life Science and Agronomy, ZhouKou Normal University, ZhouKou 466001, China
| | - Xiue Ji
- College of Life Science and Agronomy, ZhouKou Normal University, ZhouKou 466001, China
| | - Chengwei Li
- Key Laboratory of Plant Genetics and Molecular Breeding, College of Life Science and Agronomy, ZhouKou Normal University, ZhouKou 466001, China.
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Tonelli ML, Fabra A. The biocontrol agent Bacillus sp. CHEP5 primes the defense response against Cercospora sojina. World J Microbiol Biotechnol 2014; 30:2503-9. [PMID: 24880246 DOI: 10.1007/s11274-014-1675-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 05/21/2014] [Indexed: 10/25/2022]
Abstract
Glycine max (soybean) production can be dramatically affected by frogeye leaf spot (FLS) caused by Cercospora sojina Hara. The inoculation of biocontrol agents may be an alternative strategy for C. sojina control. The native biocontrol bacterium Bacillus sp. CHEP5 reduced the severity of FLS in soybean by inducing systemic resistance. We suggest that the defense response was primed since the expression of the defense related gene GmAOS was enhanced in induced plants treated with both methyl jasmonate and C. sojina. Furthermore, as GmAOS is related to jasmonic acid biosynthesis, we assume that this phytohormone is involved in induced systemic resistance signaling defense pathway in soybean against C. sojina.
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Affiliation(s)
- M L Tonelli
- Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-quimicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal 3, 5800, Río Cuarto, Córdoba, Argentina,
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Yang S, Zhang X, Cao Z, Zhao K, Wang S, Chen M, Hu X. Growth-promoting Sphingomonas paucimobilis ZJSH1 associated with Dendrobium officinale through phytohormone production and nitrogen fixation. Microb Biotechnol 2014; 7:611-20. [PMID: 25142808 PMCID: PMC4265079 DOI: 10.1111/1751-7915.12148] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 06/27/2014] [Accepted: 07/02/2014] [Indexed: 12/01/2022] Open
Abstract
Growth-promoting Sphingomonas paucimobilis ZJSH1, associated with Dendrobium officinale, a traditional Chinese medicinal plant, was characterized. At 90 days post-inoculation, strain ZJSH1 significantly promoted the growth of D. officinale seedlings, with increases of stems by 8.6% and fresh weight by 7.5%. Interestingly, the polysaccharide content extracted from the inoculated seedlings was 0.6% higher than that of the control. Similar growth promotion was observed with the transplants inoculated with strain ZJSH1. The mechanism of growth promotion was attributed to a combination of phytohormones and nitrogen fixation. Strain ZJSH1 was found using the Kjeldahl method to have a nitrogen fixation activity of 1.15 mg l−1, which was confirmed by sequencing of the nifH gene. Using high-performance liquid chromatography-mass spectrometry, strain ZJSH1 was found to produce various phytohormones, including salicylic acid (SA), indole-3-acetic acid (IAA), Zeatin and abscisic acid (ABA). The growth curve showed that strain ZJSH1 grew well in the seedlings, especially in the roots. Accordingly, much higher contents of SA, ABA, IAA and c-ZR were detected in the inoculated seedlings, which may play roles as both phytohormones and ‘Systemic Acquired Resistance’ drivers. Nitrogen fixation and secretion of plant growth regulators (SA, IAA, Zeatin and ABA) endow S. paucimobilis ZJSH1 with growth-promoting properties, which provides a potential for application in the commercial growth of D. officinale.
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Affiliation(s)
- Suijuan Yang
- College of Life Science, Zhejiang Sci-Tech University, Road 2, Hangzhou, China
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Prashar P, Kapoor N, Sachdeva S. Rhizosphere: its structure, bacterial diversity and significance. REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO/TECHNOLOGY 2014; 13:63-77. [PMID: 0 DOI: 10.1007/s11157-013-9317-z] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
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Mehta CM, Palni U, Franke-Whittle IH, Sharma AK. Compost: its role, mechanism and impact on reducing soil-borne plant diseases. WASTE MANAGEMENT (NEW YORK, N.Y.) 2014; 34:607-22. [PMID: 24373678 DOI: 10.1016/j.wasman.2013.11.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 11/28/2013] [Accepted: 11/28/2013] [Indexed: 05/14/2023]
Abstract
Soil-borne plant pathogens are responsible for causing many crop plant diseases, resulting in significant economic losses. Compost application to agricultural fields is an excellent natural approach, which can be taken to fight against plant pathogens. The application of organic waste products is also an environmentally friendly alternative to chemical use, which unfortunately is the most common approach in agriculture today. This review analyses pioneering and recent compost research, and also the mechanisms and mode of action of compost microbial communities for reducing the activity of plant pathogens in agricultural crops. In addition, an approach for improving the quality of composts through the microbial communities already present in the compost is presented. Future agricultural practices will almost definitely require integrated research strategies to help combat plant diseases.
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Affiliation(s)
- C M Mehta
- Department of Biological Sciences, College of Basic Science and Humanities, G. B. P. U. A. & T. Pantnagar, U.S. Nagar, Uttarakhand, India; Department of Botany, D.S.B. Campus, Kumaun University Nainital, Uttarakhand, India
| | - Uma Palni
- Department of Botany, D.S.B. Campus, Kumaun University Nainital, Uttarakhand, India
| | - I H Franke-Whittle
- Leopold-Franzens University, Institute of Microbiology, Technikerstraße 25, 6020 Innsbruck, Austria
| | - A K Sharma
- Department of Biological Sciences, College of Basic Science and Humanities, G. B. P. U. A. & T. Pantnagar, U.S. Nagar, Uttarakhand, India.
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Cawoy H, Mariutto M, Henry G, Fisher C, Vasilyeva N, Thonart P, Dommes J, Ongena M. Plant defense stimulation by natural isolates of bacillus depends on efficient surfactin production. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2014; 27:87-100. [PMID: 24156767 DOI: 10.1094/mpmi-09-13-0262-r] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Some plant-associated Bacillus strains produce induced systemic resistance (ISR) in the host, which contributes to their protective effect against phytopathogens. Little is known about the variety of elicitors responsible for ISR that are produced by Bacillus strains. Working with a particular strain, we have previously identified the surfactin lipopeptide as a main compound stimulating plant immune-related responses. However, with the perspective of developing Bacillus strains as biocontrol agents, it is important to establish whether a central role of surfactin is generally true for isolates belonging to the B. subtilis/amyloliquefaciens complex. To that end, we set up a comparative study involving a range of natural strains. Their secretomes were first tested for triggering early defense events in cultured tobacco cells. Six isolates with contrasting activities were further evaluated for ISR in plants, based both on macroscopic disease reduction and on stimulation of the oxylipin pathway as defense mechanism. A strong correlation was found between defense-inducing activity and the amount of surfactin produced by the isolates. These results support the idea of a widespread role for surfactin as a nonvolatile elicitor formed by B. subtilis/amyloliquefaciens, and screening for strong surfactin producers among strains naturally secreting multiple antibiotics could be an efficient approach to select good candidates as biopesticides.
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Kästner J, von Knorre D, Himanshu H, Erb M, Baldwin IT, Meldau S. Salicylic acid, a plant defense hormone, is specifically secreted by a molluscan herbivore. PLoS One 2014; 9:e86500. [PMID: 24466122 PMCID: PMC3899270 DOI: 10.1371/journal.pone.0086500] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Accepted: 12/09/2013] [Indexed: 12/27/2022] Open
Abstract
Slugs and snails are important herbivores in many ecosystems. They differ from other herbivores by their characteristic mucus trail. As the mucus is secreted at the interface between the plants and the herbivores, its chemical composition may play an essential role in plant responses to slug and snail attack. Based on our current knowledge about host-manipulation strategies employed by pathogens and insects, we hypothesized that mollusks may excrete phytohormone-like substances into their mucus. We therefore screened locomotion mucus from thirteen molluscan herbivores for the presence of the plant defense hormones jasmonic acid (JA), salicylic acid (SA) and abscisic acid (ABA). We found that the locomotion mucus of one slug, Deroceras reticulatum, contained significant amounts of SA, a plant hormone that is known to induce resistance to pathogens and to suppress plant immunity against herbivores. None of the other slugs and snails contained SA or any other hormone in their locomotion mucus. When the mucus of D. reticulatum was applied to wounded leaves of A. thaliana, the promotor of the SA-responsive gene pathogenesis related 1 (PR1) was activated, demonstrating the potential of the mucus to regulate plant defenses. We discuss the potential ecological, agricultural and medical implications of this finding.
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Affiliation(s)
- Julia Kästner
- Department of Molecular Ecology, Max-Planck-Institute for Chemical Ecology, Jena, Germany
| | | | - Himanshu Himanshu
- Department of Molecular Ecology, Max-Planck-Institute for Chemical Ecology, Jena, Germany
| | - Matthias Erb
- Root-Herbivore Interactions Group, Max-Planck-Institute for Chemical Ecology, Jena, Germany
| | - Ian T. Baldwin
- Department of Molecular Ecology, Max-Planck-Institute for Chemical Ecology, Jena, Germany
| | - Stefan Meldau
- Department of Molecular Ecology, Max-Planck-Institute for Chemical Ecology, Jena, Germany
- * E-mail:
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Pseudomonas fluorescens: A Potential Biocontrol Agent for Management of Fungal Diseases of Crop Plants. Fungal Biol 2014. [DOI: 10.1007/978-1-4939-1188-2_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Mendes R, Garbeva P, Raaijmakers JM. The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms. FEMS Microbiol Rev 2013; 37:634-63. [DOI: 10.1111/1574-6976.12028] [Citation(s) in RCA: 1382] [Impact Index Per Article: 125.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2013] [Revised: 05/22/2013] [Accepted: 05/27/2013] [Indexed: 12/18/2022] Open
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Goh CH, Veliz Vallejos DF, Nicotra AB, Mathesius U. The impact of beneficial plant-associated microbes on plant phenotypic plasticity. J Chem Ecol 2013; 39:826-39. [PMID: 23892542 PMCID: PMC3738838 DOI: 10.1007/s10886-013-0326-8] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Revised: 06/29/2013] [Accepted: 07/09/2013] [Indexed: 10/28/2022]
Abstract
Plants show phenotypic plasticity in response to changing or extreme abiotic environments; but over millions of years they also have co-evolved to respond to the presence of soil microbes. Studies on phenotypic plasticity in plants have focused mainly on the effects of the changing environments on plants' growth and survival. Evidence is now accumulating that the presence of microbes can alter plant phenotypic plasticity in a broad range of traits in response to a changing environment. In this review, we discuss the effects of microbes on plant phenotypic plasticity in response to changing environmental conditions, and how this may affect plant fitness. By using a range of specific plant-microbe interactions as examples, we demonstrate that one way that microbes can alleviate the effect of environmental stress on plants and thus increase plant fitness is to remove the stress, e.g., nutrient limitation, directly. Furthermore, microbes indirectly affect plant phenotypic plasticity and fitness through modulation of plant development and defense responses. In doing so, microbes affect fitness by both increasing or decreasing the degree of phenotypic plasticity, depending on the phenotype and the environmental stress studied, with no clear difference between the effect of prokaryotic and eukaryotic microbes in general. Additionally, plants have the ability to modulate microbial behaviors, suggesting that they manipulate bacteria, enhancing interactions that help them cope with stressful environments. Future challenges remain in the identification of the many microbial signals that modulate phenotypic plasticity, the characterization of plant genes, e.g. receptors, that mediate the microbial effects on plasticity, and the elucidation of the molecular mechanisms that link phenotypic plasticity with fitness. The characterization of plant and microbial mutants defective in signal synthesis or perception, together with carefully designed glasshouse or field experiments that test various environmental stresses will be necessary to understand the link between molecular mechanisms controlling plastic phenotypes with the resulting effects on plant fitness.
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Affiliation(s)
- Chooi-Hua Goh
- Department of Plant Science, Australian National University, Canberra, ACT 0200 Australia
| | | | - Adrienne B. Nicotra
- Department of Evolution, Ecology and Genetics, Research School of Biology, Australian National University, Canberra, ACT 0200 Australia
| | - Ulrike Mathesius
- Department of Plant Science, Australian National University, Canberra, ACT 0200 Australia
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Félix-Cañedo TE, Durán-Álvarez JC, Jiménez-Cisneros B. The occurrence and distribution of a group of organic micropollutants in Mexico City's water sources. THE SCIENCE OF THE TOTAL ENVIRONMENT 2013; 454-455:109-118. [PMID: 23542484 DOI: 10.1016/j.scitotenv.2013.02.088] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 02/07/2013] [Accepted: 02/26/2013] [Indexed: 06/02/2023]
Abstract
The occurrence and distribution of a group of 17 organic micropollutants in surface and groundwater sources from Mexico City was determined. Water samples were taken from 7 wells, 4 dams and 15 tanks where surface and groundwater are mixed and stored before distribution. Results evidenced the occurrence of seven of the target compounds in groundwater: salicylic acid, diclofenac, di-2-ethylhexylphthalate (DEHP), butylbenzylphthalate (BBP), triclosan, bisphenol A (BPA) and 4-nonylphenol (4-NP). In surface water, 11 target pollutants were detected: same found in groundwater as well as naproxen, ibuprofen, ketoprofen and gemfibrozil. In groundwater, concentration ranges of salicylic acid, 4-NP and DEHP, the most frequently found compounds, were 1-464, 1-47 and 19-232 ng/L, respectively; while in surface water, these ranges were 29-309, 89-655 and 75-2,282 ng/L, respectively. Eleven target compounds were detected in mixed water. Concentrations in mixed water were higher than those determined in groundwater but lower than the detected in surface water. Different to that found in ground and surface water, the pesticide 2,4-D was found in mixed water, indicating that some pollutants can reach areas where they are not originally present in the local water sources. Concentration of the organic micropollutants found in this study showed similar to lower to those reported in water sources from developed countries. This study provides information that enriches the state of the art on the occurrence of organic micropollutants in water sources worldwide, notably in megacities of developing countries.
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Affiliation(s)
- Thania E Félix-Cañedo
- Engineering Institute, National Autonomous University of México, 3000 University Avenue, Coyoacán, Mexico.
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Mitter B, Brader G, Afzal M, Compant S, Naveed M, Trognitz F, Sessitsch A. Advances in Elucidating Beneficial Interactions Between Plants, Soil, and Bacteria. ADVANCES IN AGRONOMY 2013:381-445. [PMID: 0 DOI: 10.1016/b978-0-12-407685-3.00007-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
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Kumar A, Munder A, Aravind R, Eapen SJ, Tümmler B, Raaijmakers JM. Friend or foe: genetic and functional characterization of plant endophytic Pseudomonas aeruginosa. Environ Microbiol 2012; 15:764-79. [PMID: 23171326 DOI: 10.1111/1462-2920.12031] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 10/16/2012] [Accepted: 10/19/2012] [Indexed: 01/02/2023]
Abstract
Endophytic Pseudomonas aeruginosa strain BP35 was originally isolated from black pepper grown in the rain forest in Kerala, India. Strain PaBP35 was shown to provide significant protection to black pepper against infections by Phytophthora capsici and Radopholus similis. For registration and implementation in disease management programmes, several traits of PaBP35 were investigated including its endophytic behaviour, biocontrol activity, phylogeny and toxicity to mammals. The results showed that PaBP35 efficiently colonized black pepper shoots and displayed a typical spatiotemporal pattern in its endophytic movement with concomitant suppression of Phytophthora rot. Confocal laser scanning microscopy revealed high populations of PaBP35::gfp2 inside tomato plantlets, supporting its endophytic behaviour in other plant species. Polyphasic approaches to genotype PaBP35, including BOX-PCR, recN sequence analysis, multilocus sequence typing and comparative genome hybridization analysis, revealed its uniqueness among P. aeruginosa strains representing clinical habitats. However, like other P. aeruginosa strains, PaBP35 exhibited resistance to antibiotics, grew at 25-41°C and produced rhamnolipids and phenazines. PaBP35 displayed strong type II secretion effectors-mediated cytotoxicity on mammalian A549 cells. Coupled with pathogenicity in a murine airway infection model, we conclude that this plant endophytic strain is as virulent as clinical P. aeruginosa strains. Safety issues related to the selection of plant endophytic bacteria for crop protection are discussed.
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Affiliation(s)
- A Kumar
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands.
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Djavaheri M, Mercado-Blanco J, Versluis C, Meyer JM, Loon LC, Bakker PAHM. Iron-regulated metabolites produced by Pseudomonas fluorescens WCS374r are not required for eliciting induced systemic resistance against Pseudomonas syringae pv. tomato in Arabidopsis. Microbiologyopen 2012; 1:311-25. [PMID: 23170230 PMCID: PMC3496975 DOI: 10.1002/mbo3.32] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Revised: 07/03/2012] [Accepted: 07/03/2012] [Indexed: 11/10/2022] Open
Abstract
The plant growth-promoting rhizobacterium Pseudomonas fluorescens WCS374r produces several iron-regulated metabolites, including the fluorescent siderophore pseudobactin (Psb374), salicylic acid (SA), and pseudomonine (Psm), a siderophore that contains a SA moiety. After purification of Psb374 from culture supernatant of WCS374r, its structure was determined following isoelectrofocusing and tandem mass spectrometry, and found to be identical to the fluorescent siderophore produced by P. fluorescens ATCC 13525. To study the role of SA and Psm production in colonization of Arabidopsis thaliana roots and in induced systemic resistance (ISR) against Pseudomonas syringae pv. tomato (Pst) by strain WCS374r, mutants disrupted in the production of these metabolites were obtained by homologous recombination. These mutants were further subjected to transposon Tn5 mutagenesis to generate mutants also deficient in Psb374 production. The mutants behaved similar to the wild type in both their Arabidopsis rhizosphere-colonizing capacity and their ability to elicit ISR against Pst. We conclude that Psb374, SA, and Psm production by P. fluorescens WCS374r are not required for eliciting ISR in Arabidopsis.
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Affiliation(s)
- Mohammad Djavaheri
- Plant-Microbe Interactions, Department of Biology, Utrecht University Padualaan 8, 3584 CH, Utrecht, The Netherlands
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