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Win KT, Tanaka F, Minamisawa K, Imaizumi-Anraku H. Growth and Yield Dynamics in Three Japanese Soybean Cultivars with Plant Growth-Promoting Pseudomonas spp. and Bradyrhizobium ottawaense Co-Inoculation. Microorganisms 2024; 12:1478. [PMID: 39065246 PMCID: PMC11279163 DOI: 10.3390/microorganisms12071478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Revised: 06/27/2024] [Accepted: 07/16/2024] [Indexed: 07/28/2024] Open
Abstract
Co-inoculation of soybeans with Bradyrhizobium and plant growth-promoting bacteria has displayed promise for enhancing plant growth, but concrete evidence of its impact on soybean yields is limited. Therefore, this study assessed the comparative efficacy of two 1-aminocyclopropane-1-carboxylate deaminase-producing Pseudomonas species (OFT2 and OFT5) co-inoculated with Bradyrhizobium ottawaense (SG09) on the growth, physiology, nodulation efficiency, and grain yield of three major Japanese soybean cultivars: Enrei, Fukuyutaka, and Satonohohoemi. The experiments were conducted in a warehouse under natural light conditions. The treatments included the inoculation of SG09, SG09 + OFT2, and SG09 + OFT5. Compared with Bradyrhizobium inoculation alone, co-inoculation led to significant improvements in nodulation efficiency, growth, and physiological performance in the Enrei and Fukuyutaka cultivars, but not in the Satonohohoemi cultivar. Furthermore, co-inoculation significantly boosted the total nitrogen content and ion uptake in the shoots, ultimately leading to a remarkable improvement in the grain yield in the Enrei and Fukuyutaka cultivars. These findings contribute to clarifying the interplay among Bradyrhizobium, Pseudomonas, and the plant host cultivar. Notably, Bradyrhizobium-Pseudomonas co-inoculation represents a potentially effective biofertilization strategy for soybean production, highlighting promising avenues for sustainable agricultural practices.
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Affiliation(s)
- Khin Thuzar Win
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba 305-8604, Ibaraki, Japan
| | - Fukuyo Tanaka
- Research Center for Advanced Analysis, National Agriculture and Food Research Organization (NARO), Tsukuba 305-8604, Ibaraki, Japan;
| | - Kiwamu Minamisawa
- Graduate School of Life Sciences, Tohoku University, Sendai 980-8577, Miyagi, Japan;
| | - Haruko Imaizumi-Anraku
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba 305-8604, Ibaraki, Japan
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Bromfield ESP, Cloutier S. Bradyrhizobium ontarionense sp. nov., a novel bacterial symbiont isolated from Aeschynomene indica (Indian jointvetch), harbours photosynthesis, nitrogen fixation and nitrous oxide (N 2O) reductase genes. Antonie Van Leeuwenhoek 2024; 117:69. [PMID: 38647727 PMCID: PMC11035471 DOI: 10.1007/s10482-024-01940-6] [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: 11/22/2023] [Accepted: 02/02/2024] [Indexed: 04/25/2024]
Abstract
A novel bacterial symbiont, strain A19T, was previously isolated from a root-nodule of Aeschynomene indica and assigned to a new lineage in the photosynthetic clade of the genus Bradyrhizobium. Here data are presented for the detailed genomic and taxonomic analyses of novel strain A19T. Emphasis is placed on the analysis of genes of practical or ecological significance (photosynthesis, nitrous oxide reductase and nitrogen fixation genes). Phylogenomic analysis of whole genome sequences as well as 50 single-copy core gene sequences placed A19T in a highly supported lineage distinct from described Bradyrhizobium species with B. oligotrophicum as the closest relative. The digital DNA-DNA hybridization and average nucleotide identity values for A19T in pair-wise comparisons with close relatives were far lower than the respective threshold values of 70% and ~ 96% for definition of species boundaries. The complete genome of A19T consists of a single 8.44 Mbp chromosome and contains a photosynthesis gene cluster, nitrogen-fixation genes and genes encoding a complete denitrifying enzyme system including nitrous oxide reductase implicated in the reduction of N2O, a potent greenhouse gas, to inert dinitrogen. Nodulation and type III secretion system genes, needed for nodulation by most rhizobia, were not detected. Data for multiple phenotypic tests complemented the sequence-based analyses. Strain A19T elicits nitrogen-fixing nodules on stems and roots of A. indica plants but not on soybeans or Macroptilium atropurpureum. Based on the data presented, a new species named Bradyrhizobium ontarionense sp. nov. is proposed with strain A19T (= LMG 32638T = HAMBI 3761T) as the type strain.
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Affiliation(s)
- Eden S P Bromfield
- Agriculture and Agri-Food Canada, 960 Carling Ave., Ottawa, K1A 0C6, Canada.
| | - Sylvie Cloutier
- Agriculture and Agri-Food Canada, 960 Carling Ave., Ottawa, K1A 0C6, Canada
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Scott A, Topp E, Revellin C, Hartmann A, Fruci M. Complete genome sequence of Bradyrhizobium ottawaense strain MIAE 01942 isolated from soybean nodules grown in antibiotic-amended soil. Microbiol Resour Announc 2024; 13:e0000424. [PMID: 38501779 PMCID: PMC11008171 DOI: 10.1128/mra.00004-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 03/08/2024] [Indexed: 03/20/2024] Open
Abstract
Bradyrhizobium ottawaense MIAE 01942 is a symbiotic nitrogen-fixing bacterium isolated from the root nodules of soybeans grown in agricultural soils amended with veterinary antibiotics. The genome consists of a single 8.45 Mb circular chromosome that harbors genes involved in nitrogen fixation, denitrification, and antibiotic and metal resistance.
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Affiliation(s)
- Andrew Scott
- Agriculture and Agri-Food Canada, London Research and Development Centre, London, Ontario, Canada
| | - Edward Topp
- Agroécologie Research Unit, INRAE, Université de Bourgogne, Dijon, France
- Department of Biology, University of Western Ontario, London, Ontario, Canada
| | - Cécile Revellin
- Agroécologie Research Unit, INRAE, Université de Bourgogne, Dijon, France
| | - Alain Hartmann
- Agroécologie Research Unit, INRAE, Université de Bourgogne, Dijon, France
| | - Michael Fruci
- Agriculture and Agri-Food Canada, London Research and Development Centre, London, Ontario, Canada
- Department of Microbiology and Immunology, University of Western Ontario, London, Ontario, Canada
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Shaaban M. Microbial pathways of nitrous oxide emissions and mitigation approaches in drylands. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 354:120393. [PMID: 38364533 DOI: 10.1016/j.jenvman.2024.120393] [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: 11/10/2023] [Revised: 01/07/2024] [Accepted: 02/11/2024] [Indexed: 02/18/2024]
Abstract
Drylands refer to water scarcity and low nutrient levels, and their plant and biocrust distribution is highly diverse, making the microbial processes that shape dryland functionality particularly unique compared to other ecosystems. Drylands are constraint for sustainable agriculture and risk for food security, and expected to increase over time. Nitrous oxide (N2O), a potent greenhouse gas with ozone reduction potential, is significantly influenced by microbial communities in drylands. However, our understanding of the biological mechanisms and processes behind N2O emissions in these areas is limited, despite the fact that they highly account for total gaseous nitrogen (N) emissions on Earth. This review aims to illustrate the important biological pathways and microbial players that regulate N2O emissions in drylands, and explores how these pathways might be influenced by global changes for example N deposition, extreme weather events, and climate warming. Additionally, we propose a theoretical framework for manipulating the dryland microbial community to effectively reduce N2O emissions using evolving techniques that offer inordinate specificity and efficacy. By combining expertise from different disciplines, these exertions will facilitate the advancement of innovative and environmentally friendly microbiome-based solutions for future climate change vindication approaches.
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Affiliation(s)
- Muhammad Shaaban
- College of Agriculture, Henan University of Science and Technology, Luoyang, China.
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Hara S, Kakizaki K, Bamba M, Itakura M, Sugawara M, Suzuki A, Sasaki Y, Takeda M, Tago K, Ohbayashi T, Aono T, Aoyagi LN, Shimada H, Shingubara R, Masuda S, Shibata A, Shirasu K, Wagai R, Akiyama H, Sato S, Minamisawa K. Does Rhizobial Inoculation Change the Microbial Community in Field Soils? A Comparison with Agricultural Land-use Changes. Microbes Environ 2024; 39:ME24006. [PMID: 39261062 PMCID: PMC11427313 DOI: 10.1264/jsme2.me24006] [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: 02/02/2024] [Accepted: 06/07/2024] [Indexed: 09/13/2024] Open
Abstract
Although microbial inoculation may be effective for sustainable crop production, detrimental aspects have been argued because of the potential of inoculated microorganisms to behave as invaders and negatively affect the microbial ecosystem. We herein compared the impact of rhizobial inoculation on the soil bacterial community with that of agricultural land-use changes using a 16S rRNA amplicon ana-lysis. Soybean plants were cultivated with and without five types of bradyrhizobial inoculants (Bradyrhizobium diazoefficiens or Bradyrhizobium ottawaense) in experimental fields of Andosol, and the high nodule occupancy (35-72%) of bradyrhizobial inoculants was confirmed by nosZ PCR. However, bradyrhizobial inoculants did not significantly affect Shannon's diversity index (α-diversity) or shifts (β-diversity) in the bacterial community in the soils. Moreover, the soil bacterial community was significantly affected by land-use types (conventional cropping, organic cropping, and original forest), where β-diversity correlated with soil chemical properties (pH, carbon, and nitrogen contents). Therefore, the effects of bradyrhizobial inoculation on bacterial communities in bulk soil were minor, regardless of high nodule occupancy. We also observed a correlation between the relative abundance of bacterial classes (Alphaproteobacteria, Gammaproteobacteria, and Gemmatimonadetes) and land-use types or soil chemical properties. The impact of microbial inoculation on soil microbial ecosystems has been exami-ned to a limited extent, such as rhizosphere communities and viability. In the present study, we found that bacterial community shifts in soil were more strongly affected by land usage than by rhizobial inoculation. Therefore, the results obtained herein highlight the importance of assessing microbial inoculants in consideration of the entire land management system.
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Affiliation(s)
- Shintaro Hara
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Kaori Kakizaki
- Graduate School of Life Sciences, Tohoku University, Sendai, 980–8577, Japan
| | - Masaru Bamba
- Graduate School of Life Sciences, Tohoku University, Sendai, 980–8577, Japan
| | - Manabu Itakura
- Graduate School of Life Sciences, Tohoku University, Sendai, 980–8577, Japan
| | - Masayuki Sugawara
- Department of Life and Food Sciences, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, 080–8555, Japan
| | - Atsuo Suzuki
- Graduate School of Life Sciences, Tohoku University, Sendai, 980–8577, Japan
| | - Yuma Sasaki
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Masanori Takeda
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Kanako Tago
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Tsubasa Ohbayashi
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Toshihiro Aono
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Luciano Nobuhiro Aoyagi
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Hiroaki Shimada
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
- Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, 080–8555, Japan
| | - Ryo Shingubara
- Research Center for Advanced Analysis (NAAC), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Sachiko Masuda
- RIKEN Center for Sustainable Resource Science, Yokohama, 230–0045, Japan
| | - Arisa Shibata
- RIKEN Center for Sustainable Resource Science, Yokohama, 230–0045, Japan
| | - Ken Shirasu
- RIKEN Center for Sustainable Resource Science, Yokohama, 230–0045, Japan
| | - Rota Wagai
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Hiroko Akiyama
- Institute for Agro-Environmental Sciences (NIAES), National Agriculture and Food Research Organization (NARO), Tsukuba, 305–8604, Japan
| | - Shusei Sato
- Graduate School of Life Sciences, Tohoku University, Sendai, 980–8577, Japan
| | - Kiwamu Minamisawa
- Graduate School of Life Sciences, Tohoku University, Sendai, 980–8577, Japan
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