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Chlebek D, Pinski A, Żur J, Michalska J, Hupert-Kocurek K. Genome Mining and Evaluation of the Biocontrol Potential of Pseudomonas fluorescens BRZ63, a New Endophyte of Oilseed Rape ( Brassica napus L.) against Fungal Pathogens. Int J Mol Sci 2020; 21:ijms21228740. [PMID: 33228091 PMCID: PMC7699435 DOI: 10.3390/ijms21228740] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/12/2020] [Accepted: 11/16/2020] [Indexed: 11/30/2022] Open
Abstract
Endophytic bacteria hold tremendous potential for use as biocontrol agents. Our study aimed to investigate the biocontrol activity of Pseudomonas fluorescens BRZ63, a new endophyte of oilseed rape (Brassica napus L.) against Rhizoctonia solani W70, Colletotrichum dematium K, Sclerotinia sclerotiorum K2291, and Fusarium avenaceum. In addition, features crucial for biocontrol, plant growth promotion, and colonization were assessed and linked with the genome sequences. The in vitro tests showed that BRZ63 significantly inhibited the mycelium growth of all tested pathogens and stimulated germination and growth of oilseed rape seedlings treated with fungal pathogens. The BRZ63 strain can benefit plants by producing biosurfactants, siderophores, indole-3-acetic acid (IAA), 1-aminocyclopropane-1-carboxylate (ACC) deaminase, and ammonia as well as phosphate solubilization. The abilities of exopolysaccharide production, autoaggregation, and biofilm formation additionally underline its potential to plant colonization and hence biocontrol. The effective colonization properties of the BRZ63 strain were confirmed by microscopy observations of EGFP-expressing cells colonizing the root surface and epidermal cells of Arabidopsis thaliana Col-0. Genome mining identified many genes related to the biocontrol process, such as transporters, siderophores, and other secondary metabolites. All analyses revealed that the BRZ63 strain is an excellent endophytic candidate for biocontrol of various plant pathogens and plant growth promotion.
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Affiliation(s)
- Daria Chlebek
- Correspondence: (D.C.); (K.H.-K.); Tel.: +48-32-2009-462 (K.H.-K.)
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Isolation and Characterisation of Endophytic Bacteria from Holostemma ada-kodien Schult. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2020. [DOI: 10.22207/jpam.14.3.34] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Plants with medical properties are often enriched with endophytes that have the potential to produce important bioactive compounds. Endophytes after entering the plant tissue may either colonize a particular tissue or may spread throughout the host plant without causing damage. The possession of pharmaceutical and biological properties has made the Holostemma ada-kodien Schult as one of the widely used plants of medicinal importance in India. Following the direct cut method three endophytic bacterial strains (UC H1, UC H4 and UC H7) were isolated, identified and characterized from the healthy looking rhizome of H. ada-kodien. Among these isolates, UC H1 and UC H4 were found to have many properties like antibacterial compounds, hydrolytic enzymes and plant growth promoting traits. The isolate UC H4 have ability for Indole-3-Acetic Acid (IAA) production of 513.54 U/ml and very good protease and pectinase activities of 20.65 U/ml and 16.09 U/ml respectively. So far no reports are available on the endophytic microflora of H. ada-kodien.
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Cardoso V, Campos F, Santos A, Ottoni M, Rosa C, Almeida V, Grael C. Biotechnological applications of the medicinal plant
Pseudobrickellia brasiliensis
and its isolated endophytic bacteria. J Appl Microbiol 2020; 129:926-934. [DOI: 10.1111/jam.14666] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 03/19/2020] [Accepted: 04/10/2020] [Indexed: 11/29/2022]
Affiliation(s)
- V.M. Cardoso
- Departamento de Farmácia Universidade Federal dos Vales do Jequitinhonha e Mucuri Diamantina MG Brazil
| | - F.F. Campos
- Faculdade de Medicina Universidade Federal dos Vales do Jequitinhonha e Mucuri Diamantina MG Brazil
| | - A.R.O. Santos
- Departamento de Microbiologia ICB, C. P. 486 Universidade Federal de Minas Gerais Belo Horizonte MG Brazil
| | - M.H.F. Ottoni
- Departamento de Farmácia Universidade Federal dos Vales do Jequitinhonha e Mucuri Diamantina MG Brazil
| | - C.A. Rosa
- Departamento de Microbiologia ICB, C. P. 486 Universidade Federal de Minas Gerais Belo Horizonte MG Brazil
| | - V.G. Almeida
- Departamento de Farmácia Universidade Federal dos Vales do Jequitinhonha e Mucuri Diamantina MG Brazil
| | - C.F.F. Grael
- Departamento de Farmácia Universidade Federal dos Vales do Jequitinhonha e Mucuri Diamantina MG Brazil
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Maggini V, Miceli E, Fagorzi C, Maida I, Fondi M, Perrin E, Mengoni A, Bogani P, Chiellini C, Mocali S, Fabiani A, Decorosi F, Giovannetti L, Firenzuoli F, Fani R. Antagonism and antibiotic resistance drive a species-specific plant microbiota differentiation in Echinacea spp. FEMS Microbiol Ecol 2019; 94:5037916. [PMID: 29912319 DOI: 10.1093/femsec/fiy118] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 06/06/2018] [Indexed: 12/19/2022] Open
Abstract
A key factor in the study of plant-microbes interactions is the composition of plant microbiota, but little is known about the factors determining its functional and taxonomic organization. Here we investigated the possible forces driving the assemblage of bacterial endophytic and rhizospheric communities, isolated from two congeneric medicinal plants, Echinacea purpurea (L.) Moench and Echinacea angustifolia (DC) Heller, grown in the same soil, by analysing bacterial strains (isolated from three different compartments, i.e. rhizospheric soil, roots and stem/leaves) for phenotypic features such as antibiotic resistance, extracellular enzymatic activity, siderophore and indole 3-acetic acid production, as well as cross-antagonistic activities. Data obtained highlighted that bacteria from different plant compartments were characterized by specific antibiotic resistance phenotypes and antibiotic production, suggesting that the bacterial communities themselves could be responsible for structuring their own communities by the production of antimicrobial molecules selecting bacterial-adaptive phenotypes for plant tissue colonization.
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Affiliation(s)
- Valentina Maggini
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy.,Center for Integrative Medicine, Careggi University Hospital, Dept. of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Elisangela Miceli
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy
| | - Camilla Fagorzi
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy
| | - Isabel Maida
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy
| | - Marco Fondi
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy
| | - Elena Perrin
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy
| | - Alessio Mengoni
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy
| | - Patrizia Bogani
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy
| | - Carolina Chiellini
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy
| | - Stefano Mocali
- Consiglio per la ricerca in agricoltura e l'analisi dell'economia agraria, Centro di ricerca Agricoltura e Ambiente (CREA-AA), via di Lanciola 12/A, 50125 Cascine del Riccio (Florence), Italy
| | - Arturo Fabiani
- Consiglio per la ricerca in agricoltura e l'analisi dell'economia agraria, Centro di ricerca Agricoltura e Ambiente (CREA-AA), via di Lanciola 12/A, 50125 Cascine del Riccio (Florence), Italy
| | - Francesca Decorosi
- Department of Agri-food Production and Environmental Science, University of Florence, Florence, Italy
| | - Luciana Giovannetti
- Department of Agri-food Production and Environmental Science, University of Florence, Florence, Italy
| | - Fabio Firenzuoli
- Center for Integrative Medicine, Careggi University Hospital, Dept. of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Renato Fani
- Dept. of Biology, University of Florence, Via Madonna del Piano 6, I-50019 Sesto Fiorentino (Florence), Italy
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Arora DS, Kaur N. Antimicrobial Potential of Fungal Endophytes from Moringa oleifera. Appl Biochem Biotechnol 2018; 187:628-648. [PMID: 30039472 DOI: 10.1007/s12010-018-2770-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 04/23/2018] [Indexed: 10/28/2022]
Abstract
The present study was aimed to isolate the endophytic fungi having antimicrobial potential from Moringa oleifera. Out of the active isolates, the endophytic fungal isolate DSE 17 obtained from the bark of the plant was selected for further studies and identified as Aspergillus fumigatus. The classical method for optimization strategy revealed inoculum size of four discs in Czapek dox's medium at a temperature of 25 °C and pH 7 with the incubation period of 6 days to be the best. Sucrose as carbon source (1%) and sodium nitrate as nitrogen source (0.2%) were found to be the best for antimicrobial activity. Response surface methodology was effective in optimizing the selected medium components in Plackett-Burman design, i.e. magnesium sulphate, dipotassium phosphate and sodium nitrate, which resulted in increase in antimicrobial activity by 1.7-fold. Chloroform was found to be the best extractant amongst different solvents. The minimum inhibitory concentration (MIC) values of the chloroformic extract ranged from 0.05 to 0.5 mg/ml, and the viable cell count studies revealed it to be bactericidal in its nature. The post-antibiotic effect (PAE) of the chloroformic extracts ranged from 2 to 20 h. Ames mutagenicity testing and MTT assay revealed the crude extract neither cytotoxic nor mutagenic, thus showing it to be biosafe. Thus, the study suggests that endophytes from this miracle plant could be potential source for the production of broad-spectrum antimicrobial compound/s.
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Affiliation(s)
- Daljit Singh Arora
- Microbial Technology Laboratory, Department of Microbiology, Guru Nanak Dev University, Amritsar, 143005, India.
| | - Navdeep Kaur
- Microbial Technology Laboratory, Department of Microbiology, Guru Nanak Dev University, Amritsar, 143005, India
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