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Maroniche GA, Puente ML, García JE, Mongiardini E, Coniglio A, Nievas S, Labarthe MM, Wisniewski-Dyé F, Rodriguez Cáceres E, Díaz-Zorita M, Cassán F. Phenogenetic profile and agronomic contribution of Azospirillum argentinense Az39 T, a reference strain for the South American inoculant industry. Microbiol Res 2024; 283:127650. [PMID: 38452553 DOI: 10.1016/j.micres.2024.127650] [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: 12/15/2023] [Revised: 02/07/2024] [Accepted: 02/12/2024] [Indexed: 03/09/2024]
Abstract
Azospirillum sp. is a plant growth-promoting rhizobacteria largely recognized for its potential to increase the yield of different important crops. In this work, we present a thorough genomic and phenotypic analysis of A. argentinense Az39T to provide new insights into the beneficial mechanisms of this microorganism. Phenotypic analyses revealed the following in vitro abilities: growth at 20-38 °C (optimum, 28 °C), pH 6.0-8.0 (optimum, pH 6.8), and in the presence of 1% (w/v) NaCl; production of variable amounts of PHB as intracellular granules; nitrogen fixation under microaerophilic conditions; IAA synthesis in the presence of L-tryptophan. Through biochemical (API 20NE) and carbon utilization profiling (Biolog) assays, we proved that A. argentinense Az39T is able to use 15 substrates and metabolize 19 different carbon substrates. Lipid composition indicated a predominance of medium and long-chain saturated fatty acids. A total of 6 replicons classified as one main chromosome, three chromids, and two plasmids, according to their tRNA and core essential genes contents, were identified. Az39T genome includes genes associated with multiple plant growth-promoting (PGP) traits such as nitrogen fixation and production of auxins, cytokinin, abscisic acid, ethylene, and polyamines. In addition, Az39T genome harbor genetic elements associated with physiological features that facilitate its survival in the soil and competence for rhizospheric colonization; this includes motility, secretion system, and quorum sensing genetic determinants. A metadata analysis of Az39T agronomic performance in the pampas region, Argentina, demonstrated significant grain yield increases in wheat and maize, proving its potential to provide better growth conditions for dryland cereals. In conclusion, our data provide a detailed insight into the metabolic profile of A. argentinense Az39T, the strain most widely used to formulate non-legume inoculants in Argentina, and allow a better understanding of the mechanisms behind its field performance.
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Affiliation(s)
- G A Maroniche
- Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata (UNMdP), CONICET, Balcarce, Buenos Aires, Argentina
| | - M L Puente
- Instituto de Microbiología y Zoología Agrícola, Instituto Nacional de Tecnología Agropecuaria (INTA), Hurlingham, Buenos Aires, Argentina
| | - J E García
- Instituto de Microbiología y Zoología Agrícola, Instituto Nacional de Tecnología Agropecuaria (INTA), Hurlingham, Buenos Aires, Argentina
| | - E Mongiardini
- Instituto de Biotecnología y Biología Molecular, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CONICET, La Plata, Buenos Aires, Argentina
| | - A Coniglio
- Laboratorio de Fisiología Vegetal y de la Interacción Planta-Microorganismo, Instituto de Investigaciones Agrobiotecnológicas (INIAB-CONICET), Universidad Nacional de Río Cuarto (UNRC), Río Cuarto, Córdoba, Argentina
| | - S Nievas
- Laboratorio de Fisiología Vegetal y de la Interacción Planta-Microorganismo, Instituto de Investigaciones Agrobiotecnológicas (INIAB-CONICET), Universidad Nacional de Río Cuarto (UNRC), Río Cuarto, Córdoba, Argentina
| | - M M Labarthe
- Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata (UNMdP), CONICET, Balcarce, Buenos Aires, Argentina
| | - F Wisniewski-Dyé
- Universite Claude Bernard Lyon 1, Laboratoire d'Ecologie Microbienne, UMR CNRS 5557, UMR INRAE 1418, VetAgro Sup, Villeurbanne 69622, France
| | | | - M Díaz-Zorita
- Facultad de Agronomía, Universidad Nacional de La Pampa (UNLPam), CONICET, Santa Rosa, La Pampa, Argentina
| | - F Cassán
- Laboratorio de Fisiología Vegetal y de la Interacción Planta-Microorganismo, Instituto de Investigaciones Agrobiotecnológicas (INIAB-CONICET), Universidad Nacional de Río Cuarto (UNRC), Río Cuarto, Córdoba, Argentina.
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Hartmann A, Binder T, Rothballer M. Quorum sensing-related activities of beneficial and pathogenic bacteria have important implications for plant and human health. FEMS Microbiol Ecol 2024; 100:fiae076. [PMID: 38744663 PMCID: PMC11149725 DOI: 10.1093/femsec/fiae076] [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: 01/23/2024] [Revised: 03/28/2024] [Accepted: 05/13/2024] [Indexed: 05/16/2024] Open
Abstract
Eukaryotic organisms coevolved with microbes from the environment forming holobiotic meta-genomic units. Members of host-associated microbiomes have commensalic, beneficial/symbiotic, or pathogenic phenotypes. More than 100 years ago, Lorenz Hiltner, pioneer of soil microbiology, introduced the term 'Rhizosphere' to characterize the observation that a high density of saprophytic, beneficial, and pathogenic microbes are attracted by root exudates. The balance between these types of microbes decide about the health of the host. Nowadays we know, that for the interaction of microbes with all eukaryotic hosts similar principles and processes of cooperative and competitive functions are in action. Small diffusible molecules like (phyto)hormones, volatiles and quorum sensing signals are examples for mediators of interspecies and cross-kingdom interactions. Quorum sensing of bacteria is mediated by different autoinducible metabolites in a density-dependent manner. In this perspective publication, the role of QS-related activities for the health of hosts will be discussed focussing mostly on N-acyl-homoserine lactones (AHL). It is also considered that in some cases very close phylogenetic relations exist between plant beneficial and opportunistic human pathogenic bacteria. Based on a genome and system-targeted new understanding, sociomicrobiological solutions are possible for the biocontrol of diseases and the health improvement of eukaryotic hosts.
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Affiliation(s)
- Anton Hartmann
- Faculty of Biology, Microbe-Host Interactions, Ludwig-Maximilian-University Munich, Grosshaderner Str. 2, D-82152 Planegg/Martinsried, Germany
- Department of Environmental Sciences, Helmholtz Zentrum Munich, German Research Center for Health and Environment, Research Unit Microbe-Plant Interactions, Ingolstädter Landstr. 1, D-85762 Neuherberg, Germany
| | - Tatiana Binder
- Department of Environmental Sciences, Helmholtz Zentrum Munich, German Research Center for Health and Environment, Research Unit Microbe-Plant Interactions, Ingolstädter Landstr. 1, D-85762 Neuherberg, Germany
| | - Michael Rothballer
- Department of Environmental Sciences, Helmholtz Zentrum Munich, German Research Center for Health and Environment, Research Unit Microbe-Plant Interactions, Ingolstädter Landstr. 1, D-85762 Neuherberg, Germany
- Helmholtz Zentrum Munich, German Research Center for Health and Environment, Institute of Network Biology, Ingolstädter Landstr. 1 D-85762 Neuherberg, Germany
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Jalal A, Oliveira CEDS, Fernandes GC, da Silva EC, da Costa KN, de Souza JS, Leite GDS, Biagini ALC, Galindo FS, Teixeira Filho MCM. Integrated use of plant growth-promoting bacteria and nano-zinc foliar spray is a sustainable approach for wheat biofortification, yield, and zinc use efficiency. FRONTIERS IN PLANT SCIENCE 2023; 14:1146808. [PMID: 37223804 PMCID: PMC10200892 DOI: 10.3389/fpls.2023.1146808] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 04/19/2023] [Indexed: 05/25/2023]
Abstract
Introduction and aims The intensive cropping system and imbalance use of chemical fertilizers to pursue high grain production and feed the fast-growing global population has disturbed agricultural sustainability and nutritional security. Understanding micronutrient fertilizer management especially zinc (Zn) through foliar application is a crucial agronomic approach that could improve agronomic biofortification of staple grain crops. The use of plant growth-promoting bacteria (PGPBs) is considered as one of the sustainable and safe strategies that could improve nutrient acquisition and uptake in edible tissues of wheat to combat Zn malnutrition and hidden hunger in humans. Therefore, the objective of this study was to evaluate the best-performing PGPB inoculants in combination with nano-Zn foliar application on the growth, grain yield, and concentration of Zn in shoots and grains, Zn use efficiencies, and estimated Zn intake under wheat cultivation in the tropical savannah of Brazil. Methods The treatments consisted of four PGPB inoculations (without inoculation, Azospirillum brasilense, Bacillus subtilis, and Pseudomonas fluorescens, applied by seeds) and five Zn doses (0, 0.75, 1.5, 3, and 6 kg ha-1, applied from nano ZnO in two splits by leaf). Results Inoculation of B. subtilis and P. fluorescens in combination with 1.5 kg ha-1 foliar nano-Zn fertilization increased the concentration of Zn, nitrogen, and phosphorus in the shoot and grain of wheat in the 2019 and 2020 cropping seasons. Shoot dry matter was increased by 5.3% and 5.4% with the inoculation of P. fluorescens, which was statistically not different from the treatments with inoculation of B. subtilis as compared to control. The grain yield of wheat was increased with increasing nano-Zn foliar application up to 5 kg Zn ha-1 with the inoculation of A. brasilense in 2019, and foliar nano-Zn up to a dose of 1.5 kg ha-1 along with the inoculation of P. fluorescens in the 2020 cropping season. The zinc partitioning index was increased with increasing nano Zn application up to 3 kg ha-1 along with the inoculation of P. fluorescens. Zinc use efficiency and applied Zn recovery were improved at low doses of nano-Zn application in combination with the inoculation of A. brasilense, B. subtilis, and P. fluorescens, respectively, as compared to control. Discussion Therefore, inoculation with B. subtilis and P. fluorescens along with foliar nano-Zn application is considered a sustainable and environmentally safe strategy to increase nutrition, growth, productivity, and Zn biofortification of wheat in tropical savannah.
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Affiliation(s)
- Arshad Jalal
- Department of Rural Engineering, Plant Health and Soils, São Paulo State University (UNESP), Ilha Solteira, Brazil
| | | | - Guilherme Carlos Fernandes
- Department of Rural Engineering, Plant Health and Soils, São Paulo State University (UNESP), Ilha Solteira, Brazil
| | - Edson Cabral da Silva
- Department of Rural Engineering, Plant Health and Soils, São Paulo State University (UNESP), Ilha Solteira, Brazil
| | - Kaway Nunes da Costa
- Department of Rural Engineering, Plant Health and Soils, São Paulo State University (UNESP), Ilha Solteira, Brazil
| | - Jeferson Silva de Souza
- Department of Rural Engineering, Plant Health and Soils, São Paulo State University (UNESP), Ilha Solteira, Brazil
| | - Gabriel da Silva Leite
- Department of Rural Engineering, Plant Health and Soils, São Paulo State University (UNESP), Ilha Solteira, Brazil
| | | | - Fernando Shintate Galindo
- Faculty of Agricultural Sciences and Technology, Department of Plant Production, São Paulo State University (UNESP), Dracena, Brazil
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Jalal A, Oliveira CEDS, Bastos ADC, Fernandes GC, de Lima BH, Furlani Junior E, de Carvalho PHG, Galindo FS, Gato IMB, Teixeira Filho MCM. Nanozinc and plant growth-promoting bacteria improve biochemical and metabolic attributes of maize in tropical Cerrado. FRONTIERS IN PLANT SCIENCE 2023; 13:1046642. [PMID: 36714773 PMCID: PMC9878843 DOI: 10.3389/fpls.2022.1046642] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 12/05/2022] [Indexed: 05/10/2023]
Abstract
Introduction Plant growth-promoting bacteria (PGPBs) could be developed as a sustainable strategy to promote plant growth and yield to feed the ever-growing global population with nutritious food. Foliar application of nano-zinc oxide (ZnO) is an environmentally safe strategy that alleviates zinc (Zn) malnutrition by improving biochemical attributes and storage proteins of grain. Methods In this context, the current study aimed to investigate the combined effect of seed inoculation with PGPBs and foliar nano-ZnO application on the growth, biochemical attributes, nutrient metabolism, and yield of maize in the tropical savannah of Brazil. The treatments consisted of four PGPB inoculations [i.e., without inoculation, Azospirillum brasilense (A. brasilense), Bacillus subtilis (B. subtilis), Pseudomonas fluorescens (P. fluorescens), which was applied on the seeds] and two doses of Zn (i.e., 0 and 3 kg ha-1, applied from nano-ZnO in two splits on the leaf). Results Inoculation of B. subtilis with foliar ZnO application increased shoot dry matter (7.3 and 9.8%) and grain yield (17.1 and 16.7%) in 2019-20 and 2020-2021 crop seasons respectively. Inoculation with A. brasilense increased 100-grains weight by 9.5% in both crop seasons. Shoot Zn accumulation was improved by 30 and 51% with inoculation of P. fluorescens in 2019-20 and 2020-2021 crop seasons. Whereas grain Zn accumulation was improved by 49 and 50.7% with inoculation of B. subtilis and P. fluorescens respectively. In addition, biochemical attributes (chlorophyll a, b and total, carotenoids, total soluble sugar and amino acids) were improved with inoculation of B. subtilis along with foliar nano ZnO application as compared to other treatments. Co-application of P. fluorescens with foliar ZnO improved concentration of grains albumin (20 and 13%) and globulin (39 and 30%). Also, co-application of B. subtilis and foliar ZnO improved concentration of grains glutelin (8.8 and 8.7%) and prolamin (15 and 21%) in first and second seasons. Discussion Therefore, inoculation of B. subtilis and P. fluorescens with foliar nano-ZnO application is considered a sustainable and environmentally safe strategy for improving the biochemical, metabolic, nutritional, and productivity attributes of maize in tropical Savannah regions.
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Affiliation(s)
- Arshad Jalal
- Department of Plant Protection, Rural Engineering and Soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, Brazil
| | | | - Andréa de Castro Bastos
- Department of Plant Protection, Rural Engineering and Soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, Brazil
| | - Guilherme Carlos Fernandes
- Department of Plant Protection, Rural Engineering and Soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, Brazil
| | - Bruno Horschut de Lima
- Department of Plant Protection, Rural Engineering and Soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, Brazil
| | - Enes Furlani Junior
- Department of Plant Science, Food Technology and Socio-Economics, São Paulo State University (UNESP), Ilha Solteira, Brazil
| | | | | | - Isabela Martins Bueno Gato
- Department of Plant Protection, Rural Engineering and Soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, Brazil
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Microbiome of Nodules and Roots of Soybean and Common Bean: Searching for Differences Associated with Contrasting Performances in Symbiotic Nitrogen Fixation. Int J Mol Sci 2022; 23:ijms231912035. [PMID: 36233333 PMCID: PMC9570480 DOI: 10.3390/ijms231912035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 09/27/2022] [Accepted: 10/07/2022] [Indexed: 01/10/2023] Open
Abstract
Biological nitrogen fixation (BNF) is a key process for the N input in agriculture, with outstanding economic and environmental benefits from the replacement of chemical fertilizers. However, not all symbioses are equally effective in fixing N2, and a major example relies on the high contribution associated with the soybean (Glycine max), contrasting with the low rates reported with the common bean (Phaseolus vulgaris) crop worldwide. Understanding these differences represents a major challenge that can help to design strategies to increase the contribution of BNF, and next-generation sequencing (NGS) analyses of the nodule and root microbiomes may bring new insights to explain differential symbiotic performances. In this study, three treatments evaluated in non-sterile soil conditions were investigated in both legumes: (i) non-inoculated control; (ii) inoculated with host-compatible rhizobia; and (iii) co-inoculated with host-compatible rhizobia and Azospirillum brasilense. In the more efficient and specific symbiosis with soybean, Bradyrhizobium presented a high abundance in nodules, with further increases with inoculation. Contrarily, the abundance of the main Rhizobium symbiont was lower in common bean nodules and did not increase with inoculation, which may explain the often-reported lack of response of this legume to inoculation with elite strains. Co-inoculation with Azospirillum decreased the abundance of the host-compatible rhizobia in nodules, probably because of competitiveness among the species at the rhizosphere, but increased in root microbiomes. The results showed that several other bacteria compose the nodule microbiomes of both legumes, including nitrogen-fixing, growth-promoters, and biocontrol agents, whose contribution to plant growth deserves further investigation. Several genera of bacteria were detected in root microbiomes, and this microbial community might contribute to plant growth through a variety of microbial processes. However, massive inoculation with elite strains should be better investigated, as it may affect the root microbiome, verified by both relative abundance and diversity indices, that might impact the contribution of microbial processes to plant growth.
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Galindo FS, Brito VB, Teixeira Filho MCM. Assessing nutritional status and development of Pereskia aculeata Mill. affected by inoculation of Azospirillum brasilense combined with nitrogen rates. JOURNAL OF PLANT NUTRITION 2021. [DOI: 10.1080/01904167.2021.2014880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Fernando Shintate Galindo
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, São Paulo, Brazil
| | - Vanessa Biazotto Brito
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, São Paulo, Brazil
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Bomfim CA, Coelho LGF, do Vale HMM, de Carvalho Mendes I, Megías M, Ollero FJ, dos Reis Junior FB. Brief history of biofertilizers in Brazil: from conventional approaches to new biotechnological solutions. Braz J Microbiol 2021; 52:2215-2232. [PMID: 34590295 PMCID: PMC8578473 DOI: 10.1007/s42770-021-00618-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 09/20/2021] [Indexed: 10/20/2022] Open
Abstract
Brazil has a long history of research with rhizobia and plant growth-promoting rhizobacteria (PGPR). Currently, the use of bio-based products in Brazil, containing microorganisms that are effective in promoting plant growth through various mechanisms, is already a consolidated reality for the cultivation of several crops of agricultural interest. This is due to the excellent results obtained over many years of research, which contributed to reinforce the use of rhizobia and PGPR by farmers. The high quality of the products offered, containing elite strains, allows the reduction and prevention in the use of mineral fertilization, contributing to low-cost and sustainable agriculture. Currently, research has turned its efforts in the search for new products that further increase the efficiency of those already available on the market and for new formulations or inoculation strategies that contribute to greater productivity and efficiency of these products. In this review, the history of biological products for main crops of agricultural interest and the new biotechnologies and research available in the agricultural market are discussed.
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Affiliation(s)
- Catharine Abreu Bomfim
- Embrapa Cerrados, Planaltina, Distrito Federal Brazil
- Microbial Biology, University of Brasilia, Brasilia, Distrito Federal Brazil
| | - Lucas Gabriel Ferreira Coelho
- Embrapa Cerrados, Planaltina, Distrito Federal Brazil
- Microbial Biology, University of Brasilia, Brasilia, Distrito Federal Brazil
| | | | | | - Manuel Megías
- Department of Microbiology, Faculty of Biology, Universidad de Sevilla, Sevilla, Spain
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Importance of N-Acyl-Homoserine Lactone-Based Quorum Sensing and Quorum Quenching in Pathogen Control and Plant Growth Promotion. Pathogens 2021; 10:pathogens10121561. [PMID: 34959516 PMCID: PMC8706166 DOI: 10.3390/pathogens10121561] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/22/2021] [Accepted: 11/25/2021] [Indexed: 11/17/2022] Open
Abstract
The biological control of plant pathogens is linked to the composition and activity of the plant microbiome. Plant-associated microbiomes co-evolved with land plants, leading to plant holobionts with plant-beneficial microbes but also with plant pathogens. A diverse range of plant-beneficial microbes assists plants to reach their optimal development and growth under both abiotic and biotic stress conditions. Communication within the plant holobiont plays an important role, and besides plant hormonal interactions, quorum-sensing signalling of plant-associated microbes plays a central role. Quorum-sensing (QS) autoinducers, such as N-acyl-homoserine lactones (AHL) of Gram-negative bacteria, cause a pronounced interkingdom signalling effect on plants, provoking priming processes of pathogen defence and insect pest control. However, plant pathogenic bacteria also use QS signalling to optimise their virulence; these QS activities can be controlled by quorum quenching (QQ) and quorum-sensing inhibition (QSI) approaches by accompanying microbes and also by plants. Plant growth-promoting bacteria (PGPB) have also been shown to demonstrate QQ activity. In addition, some PGPB only harbour genes for AHL receptors, so-called luxR-solo genes, which can contribute to plant growth promotion and biological control. The presence of autoinducer solo receptors may reflect ongoing microevolution processes in microbe–plant interactions. Different aspects of QS systems in bacteria–plant interactions of plant-beneficial and pathogenic bacteria will be discussed, and practical applications of bacteria with AHL-producing or -quenching activity; QS signal molecules stimulating pathogen control and plant growth promotion will also be presented.
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Galindo FS, Pagliari PH, Buzetti S, Rodrigues WL, Fernandes GC, Biagini ALC, Tavanti RFR, Teixeira Filho MCM. Nutrient availability affected by silicate and
Azospirillum brasilense
application in corn–wheat rotation. AGRONOMY JOURNAL 2021. [DOI: 10.1002/agj2.20802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
| | - Paulo Humberto Pagliari
- Dep. of Soil, Water, and Climate Univ. of Minnesota, Southwest Research and Outreach Center Lamberton MN USA
| | - Salatiér Buzetti
- Dep. of Plant Health, Rural Engineering, and Soils São Paulo State Univ. Ilha Solteira São Paulo Brazil
| | - Willian Lima Rodrigues
- Dep. of Plant Health, Rural Engineering, and Soils São Paulo State Univ. Ilha Solteira São Paulo Brazil
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Galindo FS, Pagliari PH, Buzetti S, Rodrigues WL, Fernandes GC, Biagini ALC, Marega EMR, Tavanti RFR, Jalal A, Teixeira Filho MCM. Corn shoot and grain nutrient uptake affected by silicon application combined with Azospirillum brasilense inoculation and nitrogen rates. JOURNAL OF PLANT NUTRITION 2021. [DOI: 10.1080/01904167.2021.1943436] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Fernando Shintate Galindo
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, Brazil
| | - Paulo Humberto Pagliari
- Department of Soil, Water, and Climate, University of Minnesota, Southwest Research and Outreach Center, Lamberton, MN, USA
| | - Salatiér Buzetti
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, Brazil
| | - Willian Lima Rodrigues
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, Brazil
| | - Guilherme Carlos Fernandes
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, Brazil
| | | | - Evelyn Maria Rocha Marega
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, Brazil
| | | | - Arshad Jalal
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, Brazil
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Galindo FS, Bellotte JLM, Santini JMK, Buzetti S, Rosa PAL, Jalal A, Teixeira Filho MCM. Zinc use efficiency of maize-wheat cropping after inoculation with Azospirillum brasilense. NUTRIENT CYCLING IN AGROECOSYSTEMS 2021. [DOI: 10.1007/s10705-021-10149-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Pankievicz VCS, do Amaral FP, Ané JM, Stacey G. Diazotrophic Bacteria and Their Mechanisms to Interact and Benefit Cereals. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2021; 34:491-498. [PMID: 33543986 DOI: 10.1094/mpmi-11-20-0316-fi] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Plant-growth-promoting bacteria (PGPB) stimulate plant growth through diverse mechanisms. In addition to biological nitrogen fixation, diazotrophic PGPB can improve nutrient uptake efficiency from the soil, produce and release phytohormones to the host, and confer resistance against pathogens. The genetic determinants that drive the success of biological nitrogen fixation in nonlegume plants are understudied. These determinants include recognition and signaling pathways, bacterial colonization, and genotype specificity between host and bacteria. This review presents recent discoveries of how nitrogen-fixing PGPB interact with cereals and promote plant growth. We suggest adopting an experimental model system, such as the Setaria-diazotrophic bacteria association, as a reliable way to better understand the associated mechanisms and, ultimately, increase the use of PGPB inoculants for sustainable agriculture.[Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
| | - Fernanda Plucani do Amaral
- Divisions of Plant Sciences and Biochemistry, C. S. Bond Life Science Center, University of Missouri, Columbia, MO, U.S.A
| | - Jean-Michel Ané
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, U.S.A
| | - Gary Stacey
- Divisions of Plant Sciences and Biochemistry, C. S. Bond Life Science Center, University of Missouri, Columbia, MO, U.S.A
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The Challenge of Combining High Yields with Environmentally Friendly Bioproducts: A Review on the Compatibility of Pesticides with Microbial Inoculants. AGRONOMY-BASEL 2021. [DOI: 10.3390/agronomy11050870] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Inoculants or biofertilizers aiming to partially or fully replace chemical fertilizers are becoming increasingly important in agriculture, as there is a global perception of the need to increase sustainability. In this review, we discuss some important results of inoculation of a variety of crops with rhizobia and other plant growth-promoting bacteria (PGPB). Important improvements in the quality of the inoculants and on the release of new strains and formulations have been achieved. However, agriculture will continue to demand chemical pesticides, and their low compatibility with inoculants, especially when applied to seeds, represents a major limitation to the success of inoculation. The differences in the compatibility between pesticides and inoculants depend on their active principle, formulation, time of application, and period of contact with living microorganisms; however, in general they have a high impact on cell survival and metabolism, affecting the microbial contribution to plant growth. New strategies to solve the incompatibility between pesticides and inoculants are needed, as those that have been proposed to date are still very modest in terms of demand.
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Hartmann A, Klink S, Rothballer M. Plant Growth Promotion and Induction of Systemic Tolerance to Drought and Salt Stress of Plants by Quorum Sensing Auto-Inducers of the N-acyl-homoserine Lactone Type: Recent Developments. FRONTIERS IN PLANT SCIENCE 2021; 12:683546. [PMID: 34135932 PMCID: PMC8200625 DOI: 10.3389/fpls.2021.683546] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 05/06/2021] [Indexed: 05/12/2023]
Affiliation(s)
- Anton Hartmann
- Microbe-Host Interactions, Faculty of Biology, Ludwig-Maximilians-Universität München, Planegg, Germany
- *Correspondence: Anton Hartmann,
| | - Sophia Klink
- Institute of Network Biology, Helmholtz Zentrum München, Neuherberg, Germany
| | - Michael Rothballer
- Institute of Network Biology, Helmholtz Zentrum München, Neuherberg, Germany
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Investigation of Azospirillum brasilense Inoculation and Silicon Application on Corn Yield Responses. JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION 2020. [DOI: 10.1007/s42729-020-00306-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Galindo FS, Buzetti S, Rodrigues WL, Boleta EHM, Silva VM, Tavanti RFR, Fernandes GC, Biagini ALC, Rosa PAL, Teixeira Filho MCM. Inoculation of Azospirillum brasilense associated with silicon as a liming source to improve nitrogen fertilization in wheat crops. Sci Rep 2020; 10:6160. [PMID: 32273589 PMCID: PMC7145820 DOI: 10.1038/s41598-020-63095-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 03/24/2020] [Indexed: 02/05/2023] Open
Abstract
This research was developed to investigate whether inoculation with Azospirillum brasilense in combination with silicon (Si) can enhance N use efficiency (NUE) in wheat and to evaluate and correlate nutritional and productive components and wheat grain yield. The study was carried out on a Rhodic Hapludox under a no-till system with a completely randomized block design with four replications in a 2 × 2 × 5 factorial scheme: two liming sources (with Ca and Mg silicate as the Si source and limestone); two inoculations (control - without inoculation and seed inoculation with A. brasilense) and five side-dress N rates (0, 50, 100, 150 and 200 kg ha-1). The results of this study showed positive improvements in wheat growth production parameters, NUE and grain yield as a function of inoculation associated with N rates. Inoculation can complement and optimize N fertilization, even with high N application rates. The potential benefits of Si use were less evident; however, the use of Si can favour N absorption, even when associated with A. brasilense. Therefore, studies conducted under tropical conditions with Ca and Mg silicate are necessary to better understand the role of Si applied alone or in combination with growth-promoting bacteria such as A. brasilense.
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Affiliation(s)
- Fernando Shintate Galindo
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil
| | - Salatiér Buzetti
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil
| | - Willian Lima Rodrigues
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil
| | - Eduardo Henrique Marcandalli Boleta
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil
| | - Vinicius Martins Silva
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil
| | - Renan Francisco Rimoldi Tavanti
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil
| | - Guilherme Carlos Fernandes
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil
| | - Antônio Leonardo Campos Biagini
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil
| | - Poliana Aparecida Leonel Rosa
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil
| | - Marcelo Carvalho Minhoto Teixeira Filho
- São Paulo State University (UNESP), College of Engineering of Ilha Solteira, Department of Plant Health, Rural Engineering, and Soils, P.O. BOX 15385-000, Av. Brasil Sul, 830 - Centro, Ilha Solteira, state of São Paulo, Brazil.
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Galindo FS, Pagliari PH, Buzetti S, Rodrigues WL, Santini JMK, Boleta EHM, Rosa PAL, Rodrigues Nogueira TA, Lazarini E, Filho MCMT. Can silicon applied to correct soil acidity in combination with Azospirillum brasilense inoculation improve nitrogen use efficiency in maize? PLoS One 2020; 15:e0230954. [PMID: 32267854 PMCID: PMC7141695 DOI: 10.1371/journal.pone.0230954] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 03/12/2020] [Indexed: 02/05/2023] Open
Abstract
Alternative management practices are needed to minimize the need for chemical fertilizer use in non-leguminous cropping systems. The use of biological agents that can fix atmospheric N has shown potential to improve nutrient availability in grass crops. This research was developed to investigate if inoculation with Azospirillum brasilense in combination with silicon (Si) can enhance N use efficiency (NUE) in maize. The study was set up in a Rhodic Hapludox under a no-till system, in a completely randomized block design with four replicates. Treatments were tested in a full factorial design and included: i) five side dress N rates (0 to 200 kg ha-1); ii) two liming sources (Ca and Mg silicate and dolomitic limestone); and iii) with and without seed inoculation with A. brasilense. Inoculation with A. brasilense was found to increase grain yield by 15% when N was omitted and up to 10% when N was applied. Inoculation also increased N accumulation in plant tissue. Inoculation and limestone application were found to increase leaf chlorophyll index, number of grains per ear, harvest index, and NUE. Inoculation increased harvest index and NUE by 9.5 and 19.3%, respectively, compared with non-inoculated plots. Silicon application increased leaf chlorophyll index and N-leaf concentration. The combination of Si and inoculation provided greater Si-shoot accumulation. This study showed positive improvements in maize growth production parameters as a result of inoculation, but the potential benefits of Si use were less evident. Further research should be conducted under growing conditions that provide some level of biotic or abiotic stress to study the true potential of Si application.
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Affiliation(s)
- Fernando Shintate Galindo
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, São Paulo, Brazil
| | - Paulo Humberto Pagliari
- Department of Soil, Water, and Climate, University of Minnesota, Southwest Research and Outreach Center, Lamberton, Minnesota, United States of America
| | - Salatiér Buzetti
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, São Paulo, Brazil
| | - Willian Lima Rodrigues
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, São Paulo, Brazil
| | | | | | - Poliana Aparecida Leonel Rosa
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, São Paulo, Brazil
| | | | - Edson Lazarini
- Department of Plant Health, Rural Engineering, and Soils, São Paulo State University, Ilha Solteira, São Paulo, Brazil
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Method for Recovering and Counting Viable Cells from Maize Seeds Inoculated with Azospirillum brasilense. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2020. [DOI: 10.22207/jpam.14.1.21] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Can NBPT urease inhibitor in combination with Azospirillum brasilense inoculation improve wheat development? NUTRIENT CYCLING IN AGROECOSYSTEMS 2020. [DOI: 10.1007/s10705-020-10061-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Assessing Forms of Application of Azospirillum brasilense Associated with Silicon Use on Wheat. AGRONOMY 2019. [DOI: 10.3390/agronomy9110678] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The use of biological techniques such as plant growth-promoting bacteria (PGPB) can represent a sustainable alternative for cereal growth in tropical areas. Research showing the potential for management practices which optimize PGPB inoculation is of utmost importance. This research was developed to investigate the potential use of Azospirillum brasilense in wheat cropping systems, as well as to assess the potential synergistic interactions between the beneficial use of silicon (Si), principally under abiotic and biotic conditions, and A. brasilense forms of application and how they impact crop development and wheat yield. The study was set up in a Rhodic Hapludox under a no-till system. The experimental design was a completely randomized block design with four replicates arranged in a factorial scheme with four inoculation forms (control, seed, groove, and leaf) and two soil acidity corrective sources (Ca and Mg silicate as Si source and dolomitic limestone). Seed inoculation was more effective in promoting wheat growth and development, with higher yield, showing an increase of 26.7% in wheat grain yield. Calcium and magnesium silicate application associated with foliar inoculation and without A. brasilense inoculation can increase wheat grain yield.
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Hartmann A, Fischer D, Kinzel L, Chowdhury SP, Hofmann A, Baldani JI, Rothballer M. Assessment of the structural and functional diversities of plant microbiota: Achievements and challenges - A review. J Adv Res 2019; 19:3-13. [PMID: 31341665 PMCID: PMC6629839 DOI: 10.1016/j.jare.2019.04.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 04/23/2019] [Accepted: 04/24/2019] [Indexed: 12/28/2022] Open
Abstract
Analyses of the spatial localization and the functions of bacteria in host plant habitats through in situ identification by immunological and molecular genetic techniques combined with high resolving microscopic tools and 3D-image analysis contributed substantially to a better understanding of the functional interplay of the microbiota in plants. Among the molecular genetic methods, 16S-rRNA genes were of central importance to reconstruct the phylogeny of newly isolated bacteria and to localize them in situ. However, they usually do not allow resolution for phylogenetic affiliations below genus level. Especially, the separation of opportunistic human pathogens from plant beneficial strains, currently allocated to the same species, needs genome-based resolving techniques. Whole bacterial genome sequences allow to discriminate phylogenetically closely related strains. In addition, complete genome sequences enable strain-specific monitoring for biotechnologically relevant strains. In this mini-review we present high resolving approaches for analysis of the composition and key functions of plant microbiota, focusing on interactions of diazotrophic plant growth promoting bacteria, like Azospirillum brasilense, with non-legume host plants. Combining high resolving microscopic analyses with specific immunological detection methods and molecular genetic tools, including especially transcriptome analyses of both the bacterial and plant partners, enables new insights into key traits of beneficial bacteria-plant interactions in holobiontic systems.
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Affiliation(s)
- Anton Hartmann
- Ludwig-Maximilians-Universität (LMU) München, Faculty of Biology, Host-Microbe interactions, Großhaderner Str. 2-4, D-82152 Martinsried, Germany
| | - Doreen Fischer
- Research Unit Comparative Microbiome Analysis, Helmholtz Zentrum München, German Research Center for Environmental Health, Ingolstaedter Landstr. 1, D-85764 Neuherberg, Munich, Germany
| | - Linda Kinzel
- Research Unit Microbe-Plant Interactions, Helmholtz Zentrum München, German Research Center for Environmental Health, Ingolstaedter Landstr. 1, D-85764 Neuherberg, Munich, Germany
| | - Soumitra Paul Chowdhury
- Institute of Network Biology, Helmholtz Zentrum München, German Research Center for Environmental Health, Ingolstaedter Landstr. 1, D-85764 Neuherberg, Munich, Germany
| | - Andreas Hofmann
- EMBRAPA-Agrobiologia, Br 465, Km 07, Seropédica–RJ–CEP 23891-000, Brazil
| | - Jose Ivo Baldani
- EMBRAPA-Agrobiologia, Br 465, Km 07, Seropédica–RJ–CEP 23891-000, Brazil
| | - Michael Rothballer
- Institute of Network Biology, Helmholtz Zentrum München, German Research Center for Environmental Health, Ingolstaedter Landstr. 1, D-85764 Neuherberg, Munich, Germany
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Gualpa J, Lopez G, Nievas S, Coniglio A, Halliday N, Cámara M, Cassán F. Azospirillum brasilense Az39, a model rhizobacterium with AHL quorum-quenching capacity. J Appl Microbiol 2019; 126:1850-1860. [PMID: 30924989 DOI: 10.1111/jam.14269] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 03/06/2019] [Accepted: 03/24/2019] [Indexed: 12/20/2022]
Abstract
AIMS The aim of this research was to analyse the quorum-sensing (QS) and quorum-quenching (QQ) mechanisms based on N-acyl-l-homoserine lactones (AHLs) in Azospirillum brasilense Az39, a strain with remarkable capacity to benefit a wide range of crops under agronomic conditions. METHODS AND RESULTS We performed an in silico and in vitro analysis of the quorum mechanisms in A. brasilense Az39. The results obtained in vitro using the reporter strains Chromobacterium violaceum and Agrobacterium tumefaciens and liquid chromatography coupled with mass-mass spectrometry analysis showed that although Az39 does not produce AHL molecules, it is capable of degrading them by at least two hypothetical enzymes identified by bioinformatics approach, associated with the bacterial cell. In Az39 cultures supplemented with 500 nmol l-1 of the C3 unsubstituted AHLs (C4, C6, C8, C10, C12, C14), AHL levels were lower than in noninoculated LB media controls. Similar results were observed upon the addition of AHLs with hydroxy (OH-) and keto (oxo-) substitutions in C3. These results not only demonstrate the ability of Az39 to degrade AHLs. They also show the wide spectrum of molecules that can be degraded by this bacterium. CONCLUSIONS Although A. brasilense Az39 is a silent bacterium unable to produce AHL signals, it is able to interrupt the communications between other bacteria and/or plants by a QQ activity. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first report confirming by unequivocal methodology the ability of A. brasilense, one of the most agriculturally used benefic bacteria around the world, to degrade AHLs by a QQ mechanism.
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Affiliation(s)
- J Gualpa
- Laboratorio de Fisiología Vegetal y de la Interacción Planta-Microorganismo, Universidad Nacional de Río Cuarto, Córdoba, Argentina
| | - G Lopez
- Laboratorio de Fisiología Vegetal y de la Interacción Planta-Microorganismo, Universidad Nacional de Río Cuarto, Córdoba, Argentina
| | - S Nievas
- Laboratorio de Fisiología Vegetal y de la Interacción Planta-Microorganismo, Universidad Nacional de Río Cuarto, Córdoba, Argentina
| | - A Coniglio
- Laboratorio de Fisiología Vegetal y de la Interacción Planta-Microorganismo, Universidad Nacional de Río Cuarto, Córdoba, Argentina
| | - N Halliday
- Centre for Biomolecular Sciences, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - M Cámara
- Centre for Biomolecular Sciences, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - F Cassán
- Laboratorio de Fisiología Vegetal y de la Interacción Planta-Microorganismo, Universidad Nacional de Río Cuarto, Córdoba, Argentina
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Polar flagellum of the alphaproteobacterium Azospirillum brasilense Sp245 plays a role in biofilm biomass accumulation and in biofilm maintenance under stationary and dynamic conditions. World J Microbiol Biotechnol 2019; 35:19. [PMID: 30656428 DOI: 10.1007/s11274-019-2594-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 01/11/2019] [Indexed: 10/27/2022]
Abstract
Bacteria Azospirillum brasilense may swim and swarm owing to the rotation of a constitutive polar flagellum (Fla) and inducible lateral flagella (Laf). They also construct sessile biofilms on various interfaces. As compared to the wild-type strain Sp245, the previously characterized Fla- Laf- flhB1 mutant Sp245.1063 accumulated less biomass in mature biofilms, which also were susceptible to the forces of hydrodynamic shear. In this study, we compared biofilms formed by strain Sp245 and its previously constructed derivatives on the interfaces between a minimal (malate-salt medium, or MSM) or rich (LB) liquid growth medium and a hydrophilic (glass) or hydrophobic (polystyrene) solid surface under static or dynamic conditions. In all experimental settings, the alterations in Sp245.1063's mature biofilm traits were partially (in MSM) or completely (in LB) rescued in the complemented mutant Sp245.1063 (pRK415-150177), which received the pRK415-borne coding sequence for the putative FlhB1 protein of the flagellar type III secretion system. Although Laf were not found in the biofilms of azospirilla, Fla was present on the biofilm cells of the complemented mutant Sp245.1063 (pRK415-150177) and other studied strains, which had normal flagellation on liquid and solid nutritional media. Accordingly, mature biofilms of these strains contained more biomass and were significantly more resistant to shaking at 140 rpm, as compared to the biofilms of the flagella-free mutant bacteria. These data proved that the polar flagellum of A. brasilense Sp245 plays a significant positive role in biofilm biomass increase and in biofilm stabilization.
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Dos Santos Lima Fagotti D, Abrantes JLF, Cerezini P, Fukami J, Nogueira MA, Del Cerro P, Valderrama-Fernández R, Ollero FJ, Megías M, Hungria M. Quorum sensing communication: Bradyrhizobium-Azospirillum interaction via N-acyl-homoserine lactones in the promotion of soybean symbiosis. J Basic Microbiol 2019; 59:38-53. [PMID: 30320901 DOI: 10.1002/jobm.201800324] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 09/06/2018] [Accepted: 09/22/2018] [Indexed: 11/11/2022]
Abstract
Quorum-sensing (QS) mechanisms are important in intra- and inter-specific communication among bacteria. We investigated QS mechanisms in Bradyrhizobium japonicum strain CPAC 15 and Azospirillum brasilense strains Ab-V5 and Ab-V6, used in commercial co-inoculants for the soybean crop in Brazil. A transconjugant of CPAC 15-QS with partial inactivation of N-acyl-homoserine lactones (AHLs) was obtained and several parameters were evaluated; in vitro, CPAC 15 and the transconjugant differed in growth, but not in biofilm formation, and no differences were observed in the symbiotic performance in vivo. The genome of CPAC 15 carries functional luxI and luxR genes and low amounts of three AHL molecules were detected: 3-OH-C12-AHL, 3-OH-C14-AHL, and 3-oxo-C14-AHL. Multiple copies of luxR-like genes, but not of luxI are present in the genomes of Ab-V5 and Ab-V6, and differences in gene expression were observed when the strains were co-cultured with B. japonicum; we may infer that the luxR-genes of A. brasilense may perceive the AHL molecules of B. japonicum. Soybean symbiotic performance was improved especially by co-inoculation with Ab-V6, which, contrarily to Ab-V5, did not respond to the AHLs of CPAC 15. We concluded that A. brasilense Ab-V5, but not Ab-V6, responded to the QS signals of CPAC 15, and that the synergistic interaction may be credited, at least partially, to the QS interaction. In addition, we confirmed inter- and intra-species QS communication between B. japonicum and A. brasilense and, for Azospirillum, at the strain level, impacting several steps of the symbiosis, from cell growth to plant nodulation and growth.
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Affiliation(s)
- Dáfila Dos Santos Lima Fagotti
- Embrapa Soja, Londrina, Paraná, Brazil
- Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brasília, Distrito Federal, Brazil
| | - Julia Laura Fernandes Abrantes
- Embrapa Soja, Londrina, Paraná, Brazil
- Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brasília, Distrito Federal, Brazil
| | - Paula Cerezini
- Embrapa Soja, Londrina, Paraná, Brazil
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, SBN, Brasília, Distrito Federal, Brazil
| | - Josiane Fukami
- Embrapa Soja, Londrina, Paraná, Brazil
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, SBN, Brasília, Distrito Federal, Brazil
| | - Marco A Nogueira
- Embrapa Soja, Londrina, Paraná, Brazil
- Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brasília, Distrito Federal, Brazil
| | - Pablo Del Cerro
- Facultad de Biología, Departamento de Microbiología, Universidad de Sevilla, Sevilla, Spain
| | | | - Francisco J Ollero
- Facultad de Biología, Departamento de Microbiología, Universidad de Sevilla, Sevilla, Spain
| | - Manuel Megías
- Facultad de Biología, Departamento de Microbiología, Universidad de Sevilla, Sevilla, Spain
| | - Mariangela Hungria
- Embrapa Soja, Londrina, Paraná, Brazil
- Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brasília, Distrito Federal, Brazil
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Fukami J, Ollero FJ, de la Osa C, Valderrama-Fernández R, Nogueira MA, Megías M, Hungria M. Antioxidant activity and induction of mechanisms of resistance to stresses related to the inoculation with Azospirillum brasilense. Arch Microbiol 2018; 200:1191-1203. [PMID: 29881875 DOI: 10.1007/s00203-018-1535-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 02/02/2018] [Accepted: 05/29/2018] [Indexed: 12/18/2022]
Abstract
We investigated the effects of Azospirillum brasilense strains Ab-V5 and Ab-V6 in the induction of mechanisms of systemic acquired resistance (SAR) and induced system resistance (ISR) on maize (Zea mays L.) plants. Under normal growth conditions, the treatments consisted of the standard inoculation of cells at sowing, and leaf spray of cells or their metabolites at the V2.5 growth stage; under saline stress (170 mM NaCl), the treatment consisted of standard single and co-inoculation of A. brasilense and Rhizobium tropici. The main compounds in the Azospirillum metabolites were identified as indole-3-acetic acid (IAA) and salicylic acid (SA). Under normal conditions, A. brasilense cells applied at sowing or by leaf spray increased the activities of catalase (CAT), superoxide dismutase (SOD), and malondialdehyde (MDA) in leaves, and of ascorbate peroxidase (APX) in roots; however, interestingly, in general the highest activities were observed by leaf spray of metabolites. Under normal conditions, the highest levels of salicylic acid (SA) and jasmonic acid (JA) were achieved in leaves by leaf spray of metabolites, of SA in roots by leaf spray of cells, and of JA in roots by standard inoculation and leaf spray of metabolites. Under saline stress, plant protection occurred via SA and abscisic acid (ABA), but not JA. In general, inoculation resulted in further increases in SA in leaves and roots, and ABA in leaves. We hypothesize that A. brasilense confers protection to maize plants by simultaneous induction of JA and SA pathways, and, under saline stressing conditions, by SA and ABA pathways.
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Affiliation(s)
- Josiane Fukami
- Embrapa Soja, Cx. Postal 231, Londrina, Paraná, 86001-970, Brazil.,Department of Biochemistry and Biotechnology, Universidade Estadual de Londrina, C.P. 60001, Londrina, Paraná, 86051-990, Brazil
| | - Francisco Javier Ollero
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, C.P. 41012, Seville, Spain
| | - Clara de la Osa
- Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, C.P. 41012, Seville, Spain
| | - Rocio Valderrama-Fernández
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, C.P. 41012, Seville, Spain
| | | | - Manuel Megías
- Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, C.P. 41012, Seville, Spain
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Draft Genome Sequences of Azospirillum brasilense Strains Ab-V5 and Ab-V6, Commercially Used in Inoculants for Grasses and Legumes in Brazil. GENOME ANNOUNCEMENTS 2018; 6:6/20/e00393-18. [PMID: 29773623 PMCID: PMC5958245 DOI: 10.1128/genomea.00393-18] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Azospirillum brasilense strains Ab-V5 and Ab-V6 are largely used in commercial inoculants for grasses and legumes in Brazil. Their genomes were estimated at 6,934,595 and 7,197,196 bp, respectively, and encompass genes related to nitrogen fixation, synthesis of phytohormones, and environmental adaptation. Although the strains differ in phenotypic properties, their genomes are highly similar.
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Mariana SS, Mariangela H, Marco AN. Production of polyhydroxybutyrate (PHB) and biofilm by Azospirillum brasilense aiming at the development of liquid inoculants with high performance. ACTA ACUST UNITED AC 2017. [DOI: 10.5897/ajb2017.16162] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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