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Bandeira JB, Rodrigues JN, de Oliveira RS, Pinto IO, Chagas-Júnior AF, Nascimento VL, Sarmento MI, de Moraes CB, Sarmento RA. Endophytic colonization of five Trichoderma species and their effects on growth of a Eucalyptus hybrid. Braz J Microbiol 2023; 54:3113-3125. [PMID: 37661212 PMCID: PMC10689710 DOI: 10.1007/s42770-023-01112-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 08/22/2023] [Indexed: 09/05/2023] Open
Abstract
The study aimed to evaluate the effectiveness of endophytic colonization via leaf and root inoculation of five Trichoderma species in a Eucalyptus hybrid, as well as the effects of inoculation on plant growth. The experimental design was completely randomized in a 6 × 2 factorial scheme. Plant growth was evaluated during the experimental period at three different times: 20 days after inoculation (d.a.i), 40 d.a.i., and 60 d.a.i. A statistical difference was observed between the inoculation methods during each period and between the Trichoderma species. Plants inoculated with T. asperellum showed the greatest growth among the treatments. Root-inoculated plants produced the greatest growth response. This showed that the presence of Trichoderma in the roots assisted in nutrient assimilation, promoted greater plant growth, when compared with leaf-inoculated plants. Evaluation of the effectiveness of endophytic colonization was performed at each sampling period by collecting leaf samples, and at 60 d.a.i., by collecting leaf, stem, and root samples. T. longibrachiatum and T. harzianum were isolated from leaves at 20 d.a.i., with an increase in the number of colonized plants throughout the evaluation of leaf-inoculated plants. In root-inoculated plants, treatment with T. longibrachiatum, T. harzianum, and T. asperellum presented the highest endophytic colonization in the stem and root samples (at 60 d.a.i.).
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Affiliation(s)
- Jéssica Bezerra Bandeira
- Programa de Pós-Graduação em Ciências Florestais e Ambientais, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil
| | - Jovielly Neves Rodrigues
- Programa de Pós-Graduação em Ciências Florestais e Ambientais, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil
| | - Rodrigo Silva de Oliveira
- Programa de Pós-Graduação em Produção Vegetal, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil
| | - Ismael Oliveira Pinto
- Programa de Pós-Graduação em Produção Vegetal, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil
- Setor de Agricultura, Instituto Federal do Tocantins (IFTO)-Campus Avançado Formoso do Araguaia, Formoso do Araguaia, TO, 77470-000, Brazil
| | - Aloísio Freitas Chagas-Júnior
- Programa de Pós-Graduação em Ciências Florestais e Ambientais, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil
- Programa de Pós-Graduação em Produção Vegetal, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil
| | - Vitor L Nascimento
- Setor de Fisiologia Vegetal-Departamento de Biologia, Universidade Federal de Lavras (UFLA), Lavras, MG, 37200-900, Brazil
| | - Maíra Ignacio Sarmento
- Programa de Pós-Graduação em Ciências Florestais e Ambientais, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil
| | - Cristiano Bueno de Moraes
- Programa de Pós-Graduação em Ciências Florestais e Ambientais, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil
| | - Renato Almeida Sarmento
- Programa de Pós-Graduação em Ciências Florestais e Ambientais, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil.
- Programa de Pós-Graduação em Produção Vegetal, Universidade Federal do Tocantins (UFT)-Campus Gurupi, Gurupi, TO, 77402-970, Brazil.
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Dos-Santos CM, Nascimento WBA, do Nascimento BP, Schwab S, Baldani JI, Vidal MS. Temporal assessment of root and shoot colonization of elephant grass (Pennisetum purpureum Schum.) host seedlings by Gluconacetobacter diazotrophicus strain LP343. Microbiol Res 2020; 244:126651. [PMID: 33383369 DOI: 10.1016/j.micres.2020.126651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 10/09/2020] [Accepted: 11/13/2020] [Indexed: 11/18/2022]
Abstract
Gluconacetobacter diazotrophicus is a species of great agronomic potential due to its growth-promotion traits. Its colonization process in different plants has been reported. However, there have been no studies regarding its structural colonization in elephant grass. This is a fast-growing C4-Poaceae plant, and its application in Brazil is mainly aimed at feeding dairy cattle, due to its high nutritional value. Also, in the last decade, this grass has been applied in the production of biofuels. The present study aimed to monitor the colonization process of strain LP343 of G. diazotrophicus inoculated in elephant grass seedlings of PCEA genotype, by using a mCherry-tagged bacterium. Samples of roots and shoots collected at different periods were visualized by confocal laser-scanning microscopy. The colony-counting assay was used to compare the number of cells recovered in different niches and a qPCR was performed for the quantification of endophytic cells in root and shoot tissues. Results suggested that the strain LP343 quickly recognized the PCEA roots as host, attached to the elephant grass roots at 6 h, and 7 days after inoculation were able to colonize the xylem vessels of roots and shoots of elephant grass. This study advances our knowledge about the colonization process of G. diazotrophicus species in elephant grass, contributing to future studies involving the plant-bacteria interaction cultivated under gnotobiotic conditions.
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Affiliation(s)
- Carlos M Dos-Santos
- Embrapa Agrobiologia, Rodovia BR 465, km 7, CEP 23891-000, Seropédica, RJ, Brazil
| | - Wiglison B A Nascimento
- Embrapa Agrobiologia, Rodovia BR 465, km 7, CEP 23891-000, Seropédica, RJ, Brazil; Instituto de Agronomia, Departamento de Agronomia, Universidade Federal Rural do Rio de Janeiro, Rodovia BR 465, km 7, CEP 23897-000, Seropédica, RJ, Brazil
| | - Bruna P do Nascimento
- Embrapa Agrobiologia, Rodovia BR 465, km 7, CEP 23891-000, Seropédica, RJ, Brazil; Instituto de Tecnologia, Departamento de Química, Universidade Federal Rural do Rio de Janeiro, Rodovia BR 465, km 7, CEP 23897-000, Seropédica, RJ, Brazil
| | - Stefan Schwab
- Embrapa Agrobiologia, Rodovia BR 465, km 7, CEP 23891-000, Seropédica, RJ, Brazil
| | - José I Baldani
- Embrapa Agrobiologia, Rodovia BR 465, km 7, CEP 23891-000, Seropédica, RJ, Brazil
| | - Marcia S Vidal
- Embrapa Agrobiologia, Rodovia BR 465, km 7, CEP 23891-000, Seropédica, RJ, Brazil.
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Proença DN, Schwab S, Vidal MS, Baldani JI, Xavier GR, Morais PV. The nematicide Serratia plymuthica M24T3 colonizes Arabidopsis thaliana, stimulates plant growth, and presents plant beneficial potential. Braz J Microbiol 2019; 50:777-89. [PMID: 31177380 DOI: 10.1007/s42770-019-00098-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 05/27/2019] [Indexed: 01/28/2023] Open
Abstract
Nine bacterial strains were previously isolated in association with pinewood nematode (PWN) from wilted pine trees. They proved to be nematicidal in vitro, and one of the highest activities, with potential to control PWN, was showed by Serratia sp. M24T3. Its ecology in association with plants remains unclear. This study aimed to evaluate the ability of strain M24T3 to colonize the internal tissues of the model plant Arabidopsis thaliana using confocal microscopy. Plant growth-promoting bacteria (PGPB) functional traits were tested and retrieved in the genome of strain M24T3. In greenhouse conditions, the bacterial effects of all nematicidal strains were also evaluated, co-inoculated or not with Bradyrhizobium sp. 3267, on Vigna unguiculata fitness. Inoculation of strain M24T3 increased the number of A. thaliana lateral roots and the confocal analysis confirmed effective bacterial colonization in the plant. Strain M24T3 showed cellulolytic activity, siderophores production, phosphate and zinc solubilization ability, and indole acetic acid production independent of supplementation with L-tryptophan. In the genome of strain M24T3, genes involved in the interaction with the plants such as 1-aminocyclopropane-1-carboxylate (ACC) deaminase, chitinolytic activity, and quorum sensing were also detected. The genomic organization showed ACC deaminase and its leucine-responsive transcriptional regulator, and the activity of ACC deaminase was 594.6 nmol α-ketobutyrate μg protein-1 μl-1. Strain M24T3 in co-inoculation with Bradyrhizobium sp. 3267 promoted the growth of V. unguiculata. In conclusion, this study demonstrated the ability of strain M24T3 to colonize other plants besides pine trees as an endophyte and displays PGPB traits that probably increased plant tolerance to stresses.
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Bamisile BS, Dash CK, Akutse KS, Keppanan R, Afolabi OG, Hussain M, Qasim M, Wang L. Prospects of endophytic fungal entomopathogens as biocontrol and plant growth promoting agents: An insight on how artificial inoculation methods affect endophytic colonization of host plants. Microbiol Res 2018; 217:34-50. [PMID: 30384907 DOI: 10.1016/j.micres.2018.08.016] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 08/29/2018] [Accepted: 08/30/2018] [Indexed: 11/26/2022]
Abstract
Entomopathogenic fungi (EPF) can be established as endophytes in the host plants to offer a long-term preventive measure for pests and diseases. This practice serves as a better alternative to the common practice of periodic direct application of EPF on plants or the target pests as a short-term defense strategy against pests and diseases. These fungal endophytes, aside from their role in pests and diseases prevention, also act as plant growth promoters. Several fungal endophytes have been associated with improvement in plant height, dry and wet weight and other growth parameters. However, many limiting factors have been identified as mitigating the successful colonization of the host plants by EPF. The inoculation methods used have been identified as one, but sadly, this has received little or less attention. Some previous studies carried out comparison between various artificial inoculation methods; foliar application, seedling dipping, soil drenching, seed inoculation, direct injection and others. In separate studies, some authors had suggested different application methods that are best suitable for certain fungal entomopathogens. For instance, leaf inoculation with conidial suspensions was suggested to be the best inoculation method for Beauveria bassiana in sorghum, stem injection was suggested as the most suitable for coffee, while, root dipping method proved the most successful for B. bassiana colonization of tomato plants for the management of Helicoverpa armigera. Here, we discussed entomopathogenic fungal endophytes as bio-control agents, plant growth promoters and highlighted the effect of various artificial inoculation methods on their endophytic colonization of the host plants.
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Affiliation(s)
- Bamisope Steve Bamisile
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Plant Protection College, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Key Laboratory of Integrated Pest Management for Fujian and Taiwan Crops, Ministry of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Chandra Kanta Dash
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Plant Protection College, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Key Laboratory of Integrated Pest Management for Fujian and Taiwan Crops, Ministry of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Faculty of Agriculture, Sylhet Agricultural University, Sylhet 3100, Bangladesh
| | - Komivi Senyo Akutse
- International Centre of Insect Physiology and Ecology, P.O. Box 30772-00100, Nairobi, Kenya
| | - Ravindran Keppanan
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Plant Protection College, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Key Laboratory of Integrated Pest Management for Fujian and Taiwan Crops, Ministry of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Oluwatoyin Grace Afolabi
- Center for Molecular Cell and Systems Biology, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Mubasher Hussain
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Plant Protection College, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Key Laboratory of Integrated Pest Management for Fujian and Taiwan Crops, Ministry of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China; College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Muhammad Qasim
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Plant Protection College, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Key Laboratory of Integrated Pest Management for Fujian and Taiwan Crops, Ministry of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Liande Wang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Plant Protection College, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Key Laboratory of Integrated Pest Management for Fujian and Taiwan Crops, Ministry of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
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War Nongkhlaw FM, Joshi S. Microscopic study on colonization and antimicrobial property of endophytic bacteria associated with ethnomedicinal plants of Meghalaya. J Microsc Ultrastruct 2018; 5:132-139. [PMID: 30023247 PMCID: PMC6025718 DOI: 10.1016/j.jmau.2016.09.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 08/22/2016] [Accepted: 09/17/2016] [Indexed: 11/19/2022] Open
Abstract
Microscopic visualization using transmission electron microscopy (TEM) can provide a better understanding of endophytic colonization within ethnomedicinal plants. Bacterial endophytes were found attached to the host cell wall colonizing the aerenchyma and intercellular spaces of the epidermis and outer cortex except the vascular system. Colonization was non-uniform as single cells, doublets or in the form of microcolonies. Analysis of in vivo antibacterial action of the methanolic extracts of the isolated endophytic bacteria against Gram-positive, Streptococcus pyogenes MTCC 1925 and Gram-negative, Salmonella enterica ser. paratyphi MTCC735 pathogens has revealed the morphological damages in the tested pathogens respectively, under scanning electron microscopy (SEM). Detached cell wall and cell burst were observed in Streptococcus pyogenes where as, cell blisters were shown in Salmonella enterica ser. paratyphi. The study on bacterial endophyte colonization process is important to better predict how endophytes interact with their host and establish themselves in the plant environment by procuring biocontrol activity.
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Affiliation(s)
- Fenella Mary War Nongkhlaw
- Microbiology Laboratory, Department of Biotechnology Bioinformatics, North-Eastern Hill University, Shillong, India
| | - S.R. Joshi
- Microbiology Laboratory, Department of Biotechnology Bioinformatics, North-Eastern Hill University, Shillong, India
- Corresponding author at: Microbiology Laboratory, Department of Biotechnology & Bioinformatics, North-Eastern Hill University, Shillong, 93022, India. E-mail address: (S.R. Joshi)
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Patel JK, Madaan S, Archana G. Antibiotic producing endophytic Streptomyces spp. colonize above-ground plant parts and promote shoot growth in multiple healthy and pathogen-challenged cereal crops. Microbiol Res 2018; 215:36-45. [PMID: 30172307 DOI: 10.1016/j.micres.2018.06.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Revised: 04/24/2018] [Accepted: 06/02/2018] [Indexed: 11/16/2022]
Abstract
The Streptomyces spp. used in this work were previously isolated as diazotrophic endophytes from sorghum stems. Here, we characterized the Streptomyces spp. for their colonization ability, plant growth promotion and protection against fungal disease in three cereals. In vitro analysis by dual culture study showed inhibitory effect on the rice pathogen Magnaporthe oryzae B157 along with inhibition of the ubiquitous phytopathogen Rhizoctonia solani by the Streptomyces spp. used in this study. The active compounds responsible for phytopathogen inhibition were extracted with ethyl acetate and tested positive against the fungal pathogens. GC-MS based identification of the active compounds responsible for fungal pathogen inhibition showed them to be 2-(chloromethyl)-2-cyclopropyloxirane, 2, 4- ditert-butylphenol and 1-ethylthio-3-methyl-1, 3-butadiene in extracts of culture supernatants from the three different strains respectively. EGFP tagged Streptomyces strains showed profuse colonization in roots as well as aerial parts of cereal plants. Direct inhibitory action against M. oryzae B157 and R. solani correlated with the observation that upon fungal pathogen challenge, the bacterized rice, sorghum and wheat plants showed significantly good plant growth, particularly in aerial parts as compared to unbacterized controls. In addition, benefit was seen in inoculated healthy plants in terms of increase in wet weight of roots and shoots as compared to the uninoculated controls. The mechanism of biocontrol also involved induction of plant defense response as evidenced by the upregulation of PR10a, NPR1, PAL and LOX2 in Streptomyces colonized plants.
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Affiliation(s)
- Janki K Patel
- Department of Microbiology and Biotechnology Center, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, Gujarat, India
| | - Sheeba Madaan
- Department of Microbiology and Biotechnology Center, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, Gujarat, India
| | - G Archana
- Department of Microbiology and Biotechnology Center, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, Gujarat, India.
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Singh G, Singh N, Marwaha TS. Crop genotype and a novel symbiotic fungus influences the root endophytic colonization potential of plant growth promoting rhizobacteria. Physiol Mol Biol Plants 2009; 15:87-92. [PMID: 23572916 PMCID: PMC3550376 DOI: 10.1007/s12298-009-0009-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Effect of plant genotype on the root endophytic colonization ability of a plant growth promoting rhizobacteria (PGPR), Pseudomonas striata was undertaken in this study. Use of a lac-Z tagged P. striata strain showed that, it can exist as an endophyte and the plant genotype determines the performance of the inoculated PGPR. The cultivars of Zea mays L. (maize) and Vigna radiata L. (mung bean) tested showed differential affinity to the PGPR (P. striata) as reflected by a significant variation in the root endophytic colonization ability of P. striata. Coinoculation with a novel symbiotic fungus Piriformospora indica was found to stimulate endophytic colonization of P. striata in both maize and mungbean. The root exudates of maize and mungbean cultivars showed variations in the total sugar and amino acid contents. However, no consistent relationship was recorded between the concentrations of these metabolites and endophytic colonization of the added PGPR.
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Affiliation(s)
- Geeta Singh
- />Division of Microbiology, Indian Agricultural Research Institute, New Delhi, 110012 India
| | - N. Singh
- />National Bureau of Plant Genetic Resources, New Delhi, 110012 India
| | - T. S. Marwaha
- />Division of Microbiology, Indian Agricultural Research Institute, New Delhi, 110012 India
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