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Villafañe DL, Maldonado RA, Bianchi JS, Kurth D, Gramajo H, Chiesa MA, Rodríguez E. Streptomyces N2A, an endophytic actinobacteria that promotes soybean growth and increases yield and seed quality under field conditions. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2024; 343:112073. [PMID: 38522657 DOI: 10.1016/j.plantsci.2024.112073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 02/20/2024] [Accepted: 03/18/2024] [Indexed: 03/26/2024]
Abstract
Sustainable agriculture based on the use of soil-beneficial microbes such as plant growth-promoting rhizobacteria (PGPR) and biocontrol agents (BCA) is gaining great consideration to reduce the use of agrochemicals for crop production. With this aim, in this study, a total of 78 actinobacteria were isolated from the rhizosphere and endosphere of soybean roots. Based on in vitro compatibility with Bradyrhizobium japonicum, the ability to produce phytohormones, siderophores, exo-enzymes, antifungal compounds and phosphate solubilization (PGPR traits), two endophytic strains, named N2A and N9, were selected to evaluate their effects on plant growth and development at greenhouse and field conditions. Greenhouse trials showed significantly promoted seedling emergence compared to control and the conventional fungicide treatment. Analysis of growth and development associated parameters at reproductive stages and maturity at greenhouse, but also and most importantly, in field experiments showed significant improvements. Plant biomass, node number, pod number, and consequently yield, were higher in plants previously treated with N2A and co-inoculated with B. japonicum compared to the conventional seed treatment. Furthermore, a significant increase in health status and vigor was observed for seeds harvested from the N2A-treated plants in relation to seeds obtained from the conventional treatment. Thus, we demonstrated that Streptomyces sp. N2A can replace traditional chemical fungicides to protect the seed during germination, allowing good implantation, but also, stimulating the growth and development of soybean crop increasing yield and seed quality at field conditions. Altogether, this supports the potential use of Streptomyces N2A as a PGPR for soybean crop production more efficiently and sustainably.
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Affiliation(s)
- David L Villafañe
- Departamento de Microbiología, Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina
| | - Rodrigo A Maldonado
- Laboratorio de EcoFisiología Vegetal (LEFIVE), Instituto de Investigaciones en Ciencias Agrarias de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IICAR-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Rosario (UNR), Parque Villarino S/N, Zavalla 2125, Santa Fe, Argentina
| | - Julieta S Bianchi
- Laboratorio de EcoFisiología Vegetal (LEFIVE), Instituto de Investigaciones en Ciencias Agrarias de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IICAR-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Rosario (UNR), Parque Villarino S/N, Zavalla 2125, Santa Fe, Argentina
| | - Daniel Kurth
- Laboratorio de Investigaciones Microbiológicas de Lagunas Andinas (LIMLA), Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Tucumán, Argentina
| | - Hugo Gramajo
- Departamento de Microbiología, Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina
| | - María Amalia Chiesa
- Laboratorio de EcoFisiología Vegetal (LEFIVE), Instituto de Investigaciones en Ciencias Agrarias de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IICAR-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Rosario (UNR), Parque Villarino S/N, Zavalla 2125, Santa Fe, Argentina.
| | - Eduardo Rodríguez
- Departamento de Microbiología, Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina.
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Wang Y, Dong W, Chu L, Zhao H, He L, Sheng X. A combination of proteomics, genetics, and physiology provides insights into the acid-tolerance phenotype of Pseudomonas pergaminensis F77. Microbiol Res 2024; 278:127545. [PMID: 37952350 DOI: 10.1016/j.micres.2023.127545] [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: 09/13/2023] [Revised: 10/29/2023] [Accepted: 11/04/2023] [Indexed: 11/14/2023]
Abstract
Acid tolerance is crucial for the effective and persistent mineral weathering by acid-producing bacteria. Here, the molecular basis of the acid tolerance of mineral-weathering Pseudomonas pergaminensis F77 was identified using proteomics analysis of the strain under acid stress. Then, the acid tolerance of strain F77 and its mutants with deletion of the acid tolerance-related genes orf03767, mcp, resR, nueR, yegD, and fxsA, which are involved in the two-component systems, DNA repair, nucleotide binding, and membrane parts, were compared. Finally, the acid tolerance-related physiological mechanisms of strain F77 and its mutants F77ΔnueR and F77ΔresR under acidic conditions were characterized. The significantly upregulated proteins in the acid-adapted and acid-challenged strain F77 included the proteins involved in metabolic pathways associated with ATPase, membrane components, organic acid transmembrane transporters, response to stimulus, nucleotide binding, ABC transporters, and two-component systems. The cell numbers decreased by 24-100% at pH ≤ 4.50, while the membrane fluidity increased by 22-61% at pH ≤ 5.50 for the mutants F77ΔnueR and F77ΔresR, compared with that of strain F77. The intracellular H+-ATPase activities decreased by 29-33% for the mutant F77ΔnueR at pH ≤ 4.50% and 33-79% for the mutant F77ΔresR at all tested pHs (pH ≤ 7.00); meanwhile, the ratios of intracellular NAD+/NADH decreased by 71-91% for the mutant F77ΔresR at all tested pHs (pH ≤ 7.00), compared with that of strain F77. Furthermore, the intracellular putrescine concentrations were reduced by 40-70% for the mutant F77ΔresR at all tested pHs (pH ≤ 7.00) compared with that of strain F77. Our findings suggested that multiple proteins and metabolic pathways were associated with bacterial acid tolerance and revealed that nueR and resR were involved in acid tolerance based on their modulation of multiple acid tolerance-related physiological functions in strain F77.
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Affiliation(s)
- Yuanli Wang
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China; College of Biological and Food Engineering, Anhui Polytechnic University, Wuhu, China
| | - Wen Dong
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Lingfeng Chu
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Hui Zhao
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Linyan He
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China.
| | - Xiafang Sheng
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China.
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Shade A. Microbiome rescue: directing resilience of environmental microbial communities. Curr Opin Microbiol 2023; 72:102263. [PMID: 36657335 DOI: 10.1016/j.mib.2022.102263] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 11/30/2022] [Accepted: 12/18/2022] [Indexed: 01/18/2023]
Abstract
Earth's climate crisis threatens to disrupt ecosystem services and destabilize food security. Microbiome management will be a crucial component of a comprehensive strategy to maintain stable microbinal functions for ecosystems and plants in the face of climate change. Microbiome rescue is the directed, community-level recovery of microbial populations and functions lost after an environmental disturbance. Microbiome rescue aims to propel a resilience trajectory for community functions. Rescue can be achieved via demographic, functional, adaptive, or evolutionary recovery of disturbance-sensitive populations. Various ecological mechanisms support rescue, including dispersal, reactivation from dormancy, functional redundancy, plasticity, and diversification, and these mechanisms can interact. Notably, controlling microbial reactivation from dormancy is a potentially fruitful but underexplored target for rescue.
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Affiliation(s)
- Ashley Shade
- Univ Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, École Centrale de Lyon, Ampère, UMR5005, 69134 Ecully cedex, France; Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI 48824, USA; The Plant Resilience Institute, Michigan State University, East Lansing, MI 48824, USA; Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, USA; Program in Ecology, Evolution, and Behavior, Michigan State University, East Lansing, MI 48824, USA; The Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI 48824, USA.
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