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da Cunha ET, Pedrolo AM, Arisi ACM. Thermal and salt stress effects on the survival of plant growth-promoting bacteria Azospirillum brasilense in inoculants for maize cultivation. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2024; 104:5360-5367. [PMID: 38324183 DOI: 10.1002/jsfa.13366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 02/03/2024] [Accepted: 02/07/2024] [Indexed: 02/08/2024]
Abstract
BACKGROUND The plant growth-promoting bacteria (PGPB) Azospirillum brasilense is widely used as an inoculant for important grass crops, providing numerous benefits to the plants. However, one limitation to develop viable commercial inoculants is the control of PGPB survival, requiring strategies that guarantee their survival during handling and field application. The application of sublethal stress appears to be a promising strategy to increase bacterial cells tolerance to adverse environmental conditions since previous stress induces the activation of physiological protection in bacterial cell. In this work, we evaluated the effects of thermal and salt stresses on the survival of inoculant containing A. brasilense Ab-V5 and Ab-V6 strains and we monitored A. brasilense viability in inoculated maize roots after stress treatment of inoculant. RESULTS Thermal stress application (> 35 °C) in isolated cultures for both strains, as well as salt stress [sodium chloride (NaCl) concentrations > 0.3 mol L-1], resulted in growth rate decline. The A. brasilense enumeration in maize roots obtained by propidium monoazide quantitative polymerase chain reaction (PMA-qPCR), for inoculated maize seedlings grown in vitro for 7 days, showed that there is an increased number of viable cells after the salt stress treatment, indicating that A. brasilense Ab-V5 and Ab-V6 strains are able to adapt to salt stress (0.3 mol L-1 NaCl) growth conditions. CONCLUSION Azospirillum brasilense Ab-V5 and Ab-V6 strains had potential for osmoadaptation and salt stress, resulting in increased cell survival after inoculation in maize plants. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Elisandra Triches da Cunha
- CAL CCA UFSC, Food Science and Technology Department, Agrarian Science Center, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Ana Marina Pedrolo
- CAL CCA UFSC, Food Science and Technology Department, Agrarian Science Center, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Ana Carolina Maisonnave Arisi
- CAL CCA UFSC, Food Science and Technology Department, Agrarian Science Center, Federal University of Santa Catarina, Florianópolis, Brazil
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Quiroga S, Rosado-Porto D, Ratering S, Rekowski A, Schulz F, Krutych M, Zörb C, Schnell S. Long-term detection of Hartmannibacter diazotrophicus on winter wheat and spring barley roots under field conditions revealed positive correlations on yield parameters with the bacterium abundance. FEMS Microbiol Ecol 2024; 100:fiae023. [PMID: 38366928 PMCID: PMC10939331 DOI: 10.1093/femsec/fiae023] [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: 12/01/2023] [Revised: 02/09/2024] [Accepted: 02/15/2024] [Indexed: 02/19/2024] Open
Abstract
Monitoring of bioinoculants once released into the field remains largely unexplored; thus, more information is required about their survival and interactions after root colonization. Therefore, specific primers were used to perform a long-term tracking to elucidate the effect of Hartmannibacter diazotrophicus on wheat and barley production at two experimental organic agriculture field stations. Three factors were evaluated: organic fertilizer application (with and without), row spacing (15 and 50 cm), and bacterial inoculation (H. diazotrophicus and control without bacteria). Hartmannibacter diazotrophicus was detected by quantitative polymerase chain reaction on the roots (up to 5 × 105 copies g-1 dry weight) until advanced developmental stages under field conditions during two seasons, and mostly in one farm. Correlation analysis showed a significant effect of H. diazotrophicus copy numbers on the yield parameters straw yield (increase of 453 kg ha-1 in wheat compared to the mean) and crude grain protein concentration (increase of 0.30% in wheat and 0.80% in barley compared to the mean). Our findings showed an apparently constant presence of H. diazotrophicus on both wheat and barley roots until 273 and 119 days after seeding, respectively, and its addition and concentration in the roots are associated with higher yields in one crop.
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Affiliation(s)
- Santiago Quiroga
- Institute of Applied Microbiology, IFZ, Justus-Liebig University Giessen, 35392 Giessen, Germany
| | - David Rosado-Porto
- Institute of Applied Microbiology, IFZ, Justus-Liebig University Giessen, 35392 Giessen, Germany
- Faculty of Basic and Biomedical Sciences, Simón Bolívar University, 080002 Barranquilla, Colombia
| | - Stefan Ratering
- Institute of Applied Microbiology, IFZ, Justus-Liebig University Giessen, 35392 Giessen, Germany
| | - Azin Rekowski
- Institute of Crop Science, Quality of Plant Products, 340e, University of Hohenheim, 70593 Stuttgart, Germany
| | - Franz Schulz
- Department of Agronomy and Plant Breeding II, Justus-Liebig University Giessen, 35394 Giessen, Germany
| | - Marina Krutych
- Institute of Applied Microbiology, IFZ, Justus-Liebig University Giessen, 35392 Giessen, Germany
| | - Christian Zörb
- Institute of Crop Science, Quality of Plant Products, 340e, University of Hohenheim, 70593 Stuttgart, Germany
| | - Sylvia Schnell
- Institute of Applied Microbiology, IFZ, Justus-Liebig University Giessen, 35392 Giessen, Germany
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Da Silva CGN, Monteiro EDC, Diniz PP, Terra LA, Schwab S, Reis VM, Simoes-Araujo JL, Urquiaga S. Designing and validation of specific primers for the quantitative detection of bacteria in sugarcane inoculant. Braz J Microbiol 2023; 54:2627-2640. [PMID: 37843794 PMCID: PMC10689644 DOI: 10.1007/s42770-023-01144-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Accepted: 10/02/2023] [Indexed: 10/17/2023] Open
Abstract
Endophytic diazotrophic plant growth-promoting bacteria Herbaspirillum rubrisubalbicans (HCC103), Herbaspirillum seropedicae (HRC54), Paraburkholderia tropica (Ppe8T), Gluconacetobacter diazotrophicus (Pal5T), and Nitrospirillum amazonense (CBAmC) have been used as inoculants for sugarcane. The genome sequences of these strains were used to design a set of specific primers for the real-time PCR (qPCR) assay. Primer specificity was confirmed by conventional PCR using the genomic DNAs of 25 related bacterial species and the five target strains. The qPCR assays were conducted using root and shoot samples from two sugarcane varieties (RB867515 and RB92579). These samples were collected both with and without inoculation, using the target strains specified in this study. The sugarcane plants were grown in a greenhouse, utilizing a substrate composed of sterile sand and vermiculite in a 2:1 ratio, for a duration of 55 days. The primers designed for this study successfully amplified target DNA fragments from each of the bacterial species, enabling their differentiation at the species level. The total bacterial population present in the sugarcane quantified using qPCR was on average 105.2 cells g-1 of fresh tissue. Across both evaluated varieties, it was observed that the population of inoculated bacteria tended to decrease over time and became more concentrated in the sugarcane roots compared to the aerial parts. The qPCR results suggest that both the host and the microbes influence the endophytic population and the bacterial number decreases with plant age.
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Affiliation(s)
- Cleudison Gabriel Nascimento Da Silva
- Instituto de Agronomia, Programa de Pós Graduação em Fitotecnia, Universidade Federal Rural Do Rio de Janeiro (UFRRJ), Km 07, BR 465, 23890-000, Seropédica, Rio de Janeiro, Brazil.
| | - Edevaldo de Castro Monteiro
- Instituto de Agronomia, Programa de Pós Graduação em Agronomia - Ciência Do Solo, UFRRJ, Km 07, BR 465, 23890-000, Seropédica, Rio de Janeiro, Brazil
| | - Priscila Pereira Diniz
- Instituto de Agronomia, Programa de Pós Graduação em Agronomia - Ciência Do Solo, UFRRJ, Km 07, BR 465, 23890-000, Seropédica, Rio de Janeiro, Brazil
| | - Leonardo Araujo Terra
- Instituto de Agronomia, Programa de Pós Graduação em Ciência, Tecnologia e Inovação Agropecuária, UFRRJ, Km 07, BR 465, 23890-000, Seropédica, Rio de Janeiro, Brazil
| | - Stefan Schwab
- Embrapa Agrobiologia, Km 07, BR 465, 23891-000, Seropédica, Rio de Janeiro, Brazil
| | | | | | - Segundo Urquiaga
- Embrapa Agrobiologia, Km 07, BR 465, 23891-000, Seropédica, Rio de Janeiro, Brazil
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Espindula E, Sperb ER, Moz B, Pankievicz VCS, Tuleski TR, Tadra-Sfeir MZ, Bonato P, Scheid C, Merib J, de Souza EM, Passaglia LMP. Effects on gene expression during maize-Azospirillum interaction in the presence of a plant-specific inhibitor of indole-3-acetic acid production. Genet Mol Biol 2023; 46:e20230100. [PMID: 37725833 PMCID: PMC10510588 DOI: 10.1590/1678-4685-gmb-2023-0100] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Accepted: 06/27/2023] [Indexed: 09/21/2023] Open
Abstract
Amongst the sustainable alternatives to increase maize production is the use of plant growth-promoting bacteria (PGPB). Azospirillum brasilense is one of the most well-known PGPB being able to fix nitrogen and produce phytohormones, especially indole-3-acetic acid - IAA. This work investigated if there is any contribution of the bacterium to the plant's IAA levels, and how it affects the plant. To inhibit plant IAA production, yucasin, an inhibitor of the TAM/YUC pathway, was applied. Plantlets' IAA concentration was evaluated through HPLC and dual RNA-Seq was used to analyze gene expression. Statistical differences between the group treated with yucasin and the other groups showed that A. brasilense inoculation was able to prevent the phenotype caused by yucasin concerning the number of lateral roots. Genes involved in the auxin and ABA response pathways, auxin efflux transport, and the cell cycle were regulated by the presence of the bacterium, yucasin, or both. Genes involved in the response to biotic/abiotic stress, plant disease resistance, and a D-type cellulose synthase changed their expression pattern among two sets of comparisons in which A. brasilense acted as treatment. The results suggest that A. brasilense interferes with the expression of many maize genes through an IAA-independent pathway.
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Affiliation(s)
- Eliandro Espindula
- Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de
Biociências, Departamento de Genética, Programa de Pós-Graduação em Genética e
Biologia Molecular, Porto Alegre, RS, Brazil
| | - Edilena Reis Sperb
- Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de
Biociências, Departamento de Genética, Programa de Pós-Graduação em Genética e
Biologia Molecular, Porto Alegre, RS, Brazil
| | - Brenda Moz
- Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de
Biociências, Departamento de Genética, Programa de Pós-Graduação em Genética e
Biologia Molecular, Porto Alegre, RS, Brazil
| | - Vânia Carla Silva Pankievicz
- Universidade Federal do Paraná (UFPR), Centro Politécnico,
Departamento de Bioquímica e Biologia Molecular, Curitiba, PR, Brazil
| | - Thalita Regina Tuleski
- Universidade Federal do Paraná (UFPR), Centro Politécnico,
Departamento de Bioquímica e Biologia Molecular, Curitiba, PR, Brazil
| | - Michelle Zibetti Tadra-Sfeir
- Universidade Federal do Paraná (UFPR), Centro Politécnico,
Departamento de Bioquímica e Biologia Molecular, Curitiba, PR, Brazil
| | - Paloma Bonato
- Universidade Federal do Paraná (UFPR), Centro Politécnico,
Departamento de Bioquímica e Biologia Molecular, Curitiba, PR, Brazil
| | - Camila Scheid
- Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA),
Programa de Pós-Graduação em Biociências, Porto Alegre, RS, Brazil
| | - Josias Merib
- Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA),
Departamento de Farmacociências, Programa de Pós-Graduação em Biociências, Porto
Alegre, Brazil
| | - Emanuel Maltempi de Souza
- Universidade Federal do Paraná (UFPR), Centro Politécnico,
Departamento de Bioquímica e Biologia Molecular, Curitiba, PR, Brazil
| | - Luciane Maria Pereira Passaglia
- Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de
Biociências, Departamento de Genética, Programa de Pós-Graduação em Genética e
Biologia Molecular, Porto Alegre, RS, Brazil
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da Cunha ET, Pedrolo AM, Bueno JCF, Pereira TP, Soares CRFS, Arisi ACM. Inoculation of Herbaspirillum seropedicae strain SmR1 increases biomass in maize roots DKB 390 variety in the early stages of plant development. Arch Microbiol 2022; 204:373. [PMID: 35672591 DOI: 10.1007/s00203-022-02986-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 05/11/2022] [Accepted: 05/12/2022] [Indexed: 11/26/2022]
Abstract
Herbaspirillum seropedicae is a plant growth-promoting bacteria isolated from diverse plant species. In this work, the main objective was to investigate the efficiency of H. seropedicae strain SmR1 in colonizing and increasing maize growth (DKB 390 variety) in the early stages of development under greenhouse conditions. Inoculation with H. seropedicae resulted in 19.43 % (regarding High and Low N controls) and 10.51% (regarding Low N control) in mean of increase of root biomass, for 1st and 2nd greenhouse experiments, respectively, mainly in the initial stages of plant development, at 21 days after emergence (DAE). Quantification of H. seropedicae in roots and leaves was performed by quantitative PCR. H. seropedicae was detected only in maize inoculated roots by qPCR, and a slight decrease in DNA copy number g-1 of fresh root weight was observed from 7 to 21 DAE, suggesting that there was initial effective colonization on maize plants. H. seropedicae strain SmR1 efficiently increased maize root biomass exhibiting its potential to be used as inoculant in agricultures systems.
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Affiliation(s)
- Elisandra Triches da Cunha
- Food Science and Technology Department, CAL CCA UFSC, Federal University of Santa Catarina, Rod Admar Gonzaga, 1346, Florianópolis, SC, 88034-001, Brazil
| | - Ana Marina Pedrolo
- Food Science and Technology Department, CAL CCA UFSC, Federal University of Santa Catarina, Rod Admar Gonzaga, 1346, Florianópolis, SC, 88034-001, Brazil
| | - Jessica Cavalheiro Ferreira Bueno
- Food Science and Technology Department, CAL CCA UFSC, Federal University of Santa Catarina, Rod Admar Gonzaga, 1346, Florianópolis, SC, 88034-001, Brazil
| | - Tomás Pelizzaro Pereira
- Food Science and Technology Department, CAL CCA UFSC, Federal University of Santa Catarina, Rod Admar Gonzaga, 1346, Florianópolis, SC, 88034-001, Brazil
- Public Policy Coordination Department, EPAGRI, Santa Catarina Agricultural Research and Rural Extension Company, Rio do Sul, SC, Brazil
| | - Cláudio Roberto Fônseca Sousa Soares
- Microbiology, Immunology and Parasitology Department, MIP CCB UFSC, Federal University of Santa Catarina, Av Prof Henrique da Silva Fontes, 2754, Florianópolis, SC, 88040-900, Brazil
| | - Ana Carolina Maisonnave Arisi
- Food Science and Technology Department, CAL CCA UFSC, Federal University of Santa Catarina, Rod Admar Gonzaga, 1346, Florianópolis, SC, 88034-001, Brazil.
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Vazquez A, Zawoznik M, Benavides MP, Groppa MD. Azospirillum brasilense Az39 restricts cadmium entrance into wheat plants and mitigates cadmium stress. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2021; 312:111056. [PMID: 34620450 DOI: 10.1016/j.plantsci.2021.111056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 09/08/2021] [Accepted: 09/10/2021] [Indexed: 06/13/2023]
Abstract
In this work, we tested if inoculation with the plant growth-promoting rhizobacteria Azospirillum brasilense strain Az39 alleviates Cd2+ stress in wheat seedlings grown under controlled conditions. Growth, total N, N-related metabolites/enzymes, and oxidative stress parameters were measured. Additionally, the usefulness of a real-time PCR protocol to screen the preferred colonization site of the introduced microorganism was evaluated. Inoculated plants demonstrated mitigation of cadmium-induced adverse effects on plant growth and less reactive oxygen species accumulation in their roots by the end of the experiment, 28 days after sowing. Cd addition resulted in lower NO3- content in the leaves and higher NO3- content in the roots, and a significant rise in NH4+ concentration in both organs in uninoculated plants; in inoculated plants, NH4+ content in the roots did not vary. A. brasilense Az39 enhanced NO levels in wheat root tips, and more adventitious roots and root hairs were observed in inoculated plants. Despite having a more developed root system, inoculated plants showed lower Cd levels in their roots compared to non-inoculated plants. Inoculation with this PGPR favored ion homeostasis in the roots of metal-exposed plants, decreasing Cd/Fe ratio. We corroborated A. brasilense Az39 preference for wheat exorhizosphere using a real-time PCR-based method targeting the nifA gene.
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Affiliation(s)
- Analía Vazquez
- Instituto de Química y Fisicoquímica Biológicas Dr. Alejandro Paladini (IQUIFIB), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Myriam Zawoznik
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Biológica, Buenos Aires, Argentina
| | - María Patricia Benavides
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Química y Fisicoquímica Biológicas Dr. Alejandro Paladini (IQUIFIB), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina
| | - María Daniela Groppa
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Química y Fisicoquímica Biológicas Dr. Alejandro Paladini (IQUIFIB), Facultad de Farmacia y Bioquímica, Buenos Aires, Argentina.
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Espindula E, Sperb ER, Bach E, Passaglia LMP. The combined analysis as the best strategy for Dual RNA-Seq mapping. Genet Mol Biol 2020; 42:e20190215. [PMID: 32442239 PMCID: PMC7249662 DOI: 10.1590/1678-4685-gmb-2019-0215] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 11/26/2019] [Indexed: 01/01/2023] Open
Abstract
In Dual RNA-Seq experiments the simultaneous extraction of RNA and analysis of gene expression data from both interacting organisms could be a challenge. One alternative is separating the reads during in silico data analysis. There are two main mapping methods used: sequential and combined. Here we present a combined approach in which the libraries were aligned to a concatenated genome to sort the reads before mapping them to the respective annotated genomes. A comparison of this method with the sequential analysis was performed. Two RNA-Seq libraries available in public databases consisting of a eukaryotic (Zea mays) and a prokaryotic (Herbaspirillum seropediceae) organisms were mixed to simulate a Dual RNA-Seq experiment. Libraries from real Dual RNA-Seq experiments were also used. The sequential analysis consistently attributed more reads to the first reference genome used in the analysis (due to cross-mapping) than the combined approach. More importantly, the combined analysis resulted in lower numbers of cross-mapped reads. Our results highlight the necessity of combining the reference genomes to sort reads previously to the counting step to avoid losing information in Dual RNA-Seq experiments. Since most studies first map the RNA-Seq libraries to the eukaryotic genome, much prokaryotic information has probably been lost.
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Affiliation(s)
- Eliandro Espindula
- Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de Biociências, Departamento de Genética, Porto Alegre, RS, Brazil
| | - Edilena Reis Sperb
- Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de Biociências, Departamento de Genética, Porto Alegre, RS, Brazil
| | - Evelise Bach
- Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de Biociências, Departamento de Genética, Porto Alegre, RS, Brazil
| | - Luciane Maria Pereira Passaglia
- Universidade Federal do Rio Grande do Sul (UFRGS), Instituto de Biociências, Departamento de Genética, Porto Alegre, RS, Brazil
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8
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Azospirillum brasilense viable cells enumeration using propidium monoazide-quantitative PCR. Arch Microbiol 2020; 202:1653-1662. [DOI: 10.1007/s00203-020-01877-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 01/23/2020] [Accepted: 04/01/2020] [Indexed: 01/05/2023]
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Malinich EA, Bauer CE. The plant growth promoting bacterium Azospirillum brasilense is vertically transmitted in Phaseolus vulgaris (common bean). Symbiosis 2018. [DOI: 10.1007/s13199-018-0539-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Quambusch M, Winkelmann T. Bacterial Endophytes in Plant Tissue Culture: Mode of Action, Detection, and Control. Methods Mol Biol 2018; 1815:69-88. [PMID: 29981114 DOI: 10.1007/978-1-4939-8594-4_4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Endophytic bacteria have been increasingly in the focus of research projects during the last decade. This has changed the view on bacteria in plant tissue culture and led to the differentiation between artificially introduced contaminations and naturally occurring endophytes with neutral, negative, or positive impact on the plant propagation process. This review chapter gives an overview on recent findings about the impact that bacteria have on the plant physiology in general and during micropropagation. Additionally, methods for the detection and identification of bacteria in plant tissue are described and, finally, suggestions of how to deal with bacterial endophytes in in vitro culture are given.
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Affiliation(s)
- Mona Quambusch
- Abteilung Waldgenressourcen, Nordwestdeutsche Forstliche Versuchsanstalt, Hann. Münden, Germany.
| | - Traud Winkelmann
- Institut für Gartenbauliche Produktionssysteme, Leibniz Universität Hannover, Hannover, Germany
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Brusamarello-Santos LC, Gilard F, Brulé L, Quilleré I, Gourion B, Ratet P, Maltempi de Souza E, Lea PJ, Hirel B. Metabolic profiling of two maize (Zea mays L.) inbred lines inoculated with the nitrogen fixing plant-interacting bacteria Herbaspirillum seropedicae and Azospirillum brasilense. PLoS One 2017; 12:e0174576. [PMID: 28362815 PMCID: PMC5375134 DOI: 10.1371/journal.pone.0174576] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 03/10/2017] [Indexed: 11/19/2022] Open
Abstract
Maize roots can be colonized by free-living atmospheric nitrogen (N2)-fixing bacteria (diazotrophs). However, the agronomic potential of non-symbiotic N2-fixation in such an economically important species as maize, has still not been fully exploited. A preliminary approach to improve our understanding of the mechanisms controlling the establishment of such N2-fixing associations has been developed, using two maize inbred lines exhibiting different physiological characteristics. The bacterial-plant interaction has been characterized by means of a metabolomic approach. Two established model strains of Nif+ diazotrophic bacteria, Herbaspirillum seropedicae and Azospirillum brasilense and their Nif- couterparts defficient in nitrogenase activity, were used to evaluate the impact of the bacterial inoculation and of N2 fixation on the root and leaf metabolic profiles. The two N2-fixing bacteria have been used to inoculate two genetically distant maize lines (FV252 and FV2), already characterized for their contrasting physiological properties. Using a well-controlled gnotobiotic experimental system that allows inoculation of maize plants with the two diazotrophs in a N-free medium, we demonstrated that both maize lines were efficiently colonized by the two bacterial species. We also showed that in the early stages of plant development, both bacterial strains were able to reduce acetylene, suggesting that they contain functional nitrogenase activity and are able to efficiently fix atmospheric N2 (Fix+). The metabolomic approach allowed the identification of metabolites in the two maize lines that were representative of the N2 fixing plant-bacterial interaction, these included mannitol and to a lesser extend trehalose and isocitrate. Whilst other metabolites such as asparagine, although only exhibiting a small increase in maize roots following bacterial infection, were specific for the two Fix+ bacterial strains, in comparison to their Fix- counterparts. Moreover, a number of metabolites exhibited a maize-genotype specific pattern of accumulation, suggesting that the highly diverse maize genetic resources could be further exploited in terms of beneficial plant-bacterial interactions for optimizing maize growth, with reduced N fertilization inputs.
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Affiliation(s)
- Liziane Cristina Brusamarello-Santos
- Department of Biochemistry and Molecular Biology, Federal University of Paraná, Centro Politécnico, Curutiba, Paraná, Brazil
- Institut Jean-Pierre Bourgin, Institut National de la Recherche Agronomique, Centre de Versailles-Grignon, Unité Mixte de Recherche 1318 INRA-Agro-ParisTech, Equipe de Recherche Labellisée 3559, Centre National de la Recherche Scientifique, Versailles, France
| | - Françoise Gilard
- Plateforme Métabolisme-Métabolome, Institute of Plant Sciences Paris-Saclay, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, Université Paris-Sud, Université Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay, France
| | - Lenaïg Brulé
- Institut Jean-Pierre Bourgin, Institut National de la Recherche Agronomique, Centre de Versailles-Grignon, Unité Mixte de Recherche 1318 INRA-Agro-ParisTech, Equipe de Recherche Labellisée 3559, Centre National de la Recherche Scientifique, Versailles, France
| | - Isabelle Quilleré
- Institut Jean-Pierre Bourgin, Institut National de la Recherche Agronomique, Centre de Versailles-Grignon, Unité Mixte de Recherche 1318 INRA-Agro-ParisTech, Equipe de Recherche Labellisée 3559, Centre National de la Recherche Scientifique, Versailles, France
| | - Benjamin Gourion
- Institute of Plant Sciences Paris-Saclay, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, Université Paris-Sud, Université Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay, France
| | - Pascal Ratet
- Institute of Plant Sciences Paris-Saclay, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, Université Paris-Sud, Université Evry, Université Paris-Diderot, Université Paris-Saclay, Orsay, France
| | - Emanuel Maltempi de Souza
- Department of Biochemistry and Molecular Biology, Federal University of Paraná, Centro Politécnico, Curutiba, Paraná, Brazil
| | - Peter J. Lea
- Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom
| | - Bertrand Hirel
- Institut Jean-Pierre Bourgin, Institut National de la Recherche Agronomique, Centre de Versailles-Grignon, Unité Mixte de Recherche 1318 INRA-Agro-ParisTech, Equipe de Recherche Labellisée 3559, Centre National de la Recherche Scientifique, Versailles, France
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Microscopic and proteomic analysis of Zea mays roots (P30F53 variety) inoculated with Azospirillum brasilense strain FP2. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/s12892-014-0061-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Real-time PCR quantification of the plant growth promoting bacteria Herbaspirillum seropedicae strain SmR1 in maize roots. Mol Biotechnol 2015; 56:660-70. [PMID: 24563376 DOI: 10.1007/s12033-014-9742-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The plant growth promoting bacteria Herbaspirillum seropedicae SmR1 is an endophytic diazotroph found in several economically important crops. Considering that methods to monitor the plant-bacteria interaction are required, our objective was to develop a real-time PCR method for quantification of PGPB H. seropedicae in the rhizosphere of maize seedlings. Primer pairs were designed, and their specificity was verified using DNA from 12 different bacterial species. Ten standard curves of qPCR assay using HERBAS1 primers and tenfold serial dilutions of H. seropedicae SmR1 DNA were performed, and PCR efficiency of 91 % and correlation coefficient of 0.99 were obtained. H. seropedicae SmR1 limit of detection was 10(1) copies (corresponding to 60.3 fg of bacterial DNA). qPCR assay using HERBAS1 was used to detect and quantify H. seropedicae strain SmR1 in inoculated maize roots, cultivated in vitro and in pots, harvested 1, 4, 7, and 10 days after inoculation. The estimated bacterial DNA copy number per gram of root was in the range 10(7)-10(9) for plants grown in vitro and it was around 10(6) for plants grown in pots. Primer pair HERBAS1 was able to quantify H. seropedicae SmR1, and this assay can be useful for monitoring plant-bacteria interaction.
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