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Moretti LG, Crusciol CAC, Leite MFA, Momesso L, Bossolani JW, Costa OYA, Hungria M, Kuramae EE. Diverse bacterial consortia: key drivers of rhizosoil fertility modulating microbiome functions, plant physiology, nutrition, and soybean grain yield. ENVIRONMENTAL MICROBIOME 2024; 19:50. [PMID: 39030648 PMCID: PMC11264919 DOI: 10.1186/s40793-024-00595-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 07/08/2024] [Indexed: 07/21/2024]
Abstract
Soybean cultivation in tropical regions relies on symbioses with nitrogen-fixing Bradyrhizobium and plant growth-promoting bacteria (PGPBs), reducing environmental impacts of N fertilizers and pesticides. We evaluate the effects of soybean inoculation with different bacterial consortia combined with PGPBs or microbial secondary metabolites (MSMs) on rhizosoil chemistry, plant physiology, plant nutrition, grain yield, and rhizosphere microbial functions under field conditions over three growing seasons with four treatments: standard inoculation of Bradyrhizobium japonicum and Bradyrhizobium diazoefficiens consortium (SI); SI plus foliar spraying with Bacillus subtilis (SI + Bs); SI plus foliar spraying with Azospirillum brasilense (SI + Az); and SI plus seed application of MSMs enriched in lipo-chitooligosaccharides extracted from B. diazoefficiens and Rhizobium tropici (SI + MSM). Rhizosphere microbial composition, diversity, and function was assessed by metagenomics. The relationships between rhizosoil chemistry, plant nutrition, grain yield, and the abundance of microbial taxa and functions were determined by generalized joint attribute modeling. The bacterial consortia had the most significant impact on rhizosphere soil fertility, which in turn affected the bacterial community, plant physiology, nutrient availability, and production. Cluster analysis identified microbial groups and functions correlated with shifts in rhizosoil chemistry and plant nutrition. Bacterial consortia positively modulated specific genera and functional pathways involved in biosynthesis of plant secondary metabolites, amino acids, lipopolysaccharides, photosynthesis, bacterial secretion systems, and sulfur metabolism. The effects of the bacterial consortia on the soybean holobiont, particularly the rhizomicrobiome and rhizosoil fertility, highlight the importance of selecting appropriate consortia for desired outcomes. These findings have implications for microbial-based agricultural practices that enhance crop productivity, quality, and sustainability.
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Affiliation(s)
- Luiz Gustavo Moretti
- College of Agricultural Sciences, Department of Crop Science, São Paulo State University (UNESP), Botucatu, São Paulo, 18610-034, Brazil
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, 6708 PB, The Netherlands
| | - Carlos Alexandre Costa Crusciol
- College of Agricultural Sciences, Department of Crop Science, São Paulo State University (UNESP), Botucatu, São Paulo, 18610-034, Brazil
| | - Marcio Fernandes Alves Leite
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, 6708 PB, The Netherlands
| | - Letusa Momesso
- School of Agriculture, Federal University of Goiás (UFG), 74690-900, Goiânia, Goiás, Brazil
| | - João William Bossolani
- College of Agricultural Sciences, Department of Crop Science, São Paulo State University (UNESP), Botucatu, São Paulo, 18610-034, Brazil
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, 6708 PB, The Netherlands
| | - Ohana Yonara Assis Costa
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, 6708 PB, The Netherlands
| | - Mariangela Hungria
- Embrapa Soybean, Carlos João Strass Highway, Post Office Box 231, Londrina, Paraná, 86001-970, Brazil
| | - Eiko Eurya Kuramae
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, 6708 PB, The Netherlands.
- Institute of Environmental Biology, Ecology and Biodiversity, Utrecht University, Padualaan 8, Utrecht, 3584 CH, The Netherlands.
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Funnicelli MIG, de Carvalho LAL, Teheran-Sierra LG, Dibelli SC, Lemos EGDM, Pinheiro DG. Unveiling genomic features linked to traits of plant growth-promoting bacterial communities from sugarcane. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 947:174577. [PMID: 38981540 DOI: 10.1016/j.scitotenv.2024.174577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 07/04/2024] [Accepted: 07/05/2024] [Indexed: 07/11/2024]
Abstract
Microorganisms are ubiquitous, and those inhabiting plants have been the subject of several studies. Plant-associated bacteria exhibit various biological mechanisms that enable them to colonize host plants and, in some cases, enhance their fitness. In this study, we describe the genomic features predicted to be associated with plant growth-promoting traits in six bacterial communities isolated from sugarcane. The use of highly accurate single-molecule real-time sequencing technology for metagenomic samples from these bacterial communities allowed us to recover 17 genomes. The taxonomic assignments for the binned genomes were performed, revealing taxa distributed across three main phyla: Bacillota, Bacteroidota, and Pseudomonadota, with the latter being the most representative. Subsequently, we functionally annotated the metagenome-assembled genomes (MAGs) to characterize their metabolic pathways related to plant growth-promoting traits. Our study successfully identified the enrichment of important functions related to phosphate and potassium acquisition, modulation of phytohormones, and mechanisms for coping with abiotic stress. These findings could be linked to the robust colonization of these sugarcane endophytes.
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Affiliation(s)
- Michelli Inácio Gonçalves Funnicelli
- Laboratory of Bioinformatics, Department of Agricultural, Livestock and Environmental Biotechnology, São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil; Graduate Program in Agricultural and Livestock Microbiology, São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil
| | - Lucas Amoroso Lopes de Carvalho
- Laboratory of Bioinformatics, Department of Agricultural, Livestock and Environmental Biotechnology, São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil; Graduate Program in Agricultural and Livestock Microbiology, São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil
| | - Luis Guillermo Teheran-Sierra
- Agronomy Research Program, Colombian Oil Palm Research Center, Cenipalma, Calle 98 No. 70-91, Piso 14, Bogotá 111121, Colombia
| | - Sabrina Custodio Dibelli
- Laboratory of Bioinformatics, Department of Agricultural, Livestock and Environmental Biotechnology, São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil; Graduate Program in Agricultural and Livestock Microbiology, São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil
| | - Eliana Gertrudes de Macedo Lemos
- Graduate Program in Agricultural and Livestock Microbiology, São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil; Molecular Biology Laboratory, Institute for Research in Bioenergy (IPBEN), São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil
| | - Daniel Guariz Pinheiro
- Laboratory of Bioinformatics, Department of Agricultural, Livestock and Environmental Biotechnology, São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil; Graduate Program in Agricultural and Livestock Microbiology, São Paulo State University (UNESP), School of Agricultural and Veterinary Sciences, Jaboticabal, SP, Brazil.
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Haimlich S, Fridman Y, Khandal H, Savaldi-Goldstein S, Levy A. Widespread horizontal gene transfer between plants and bacteria. ISME COMMUNICATIONS 2024; 4:ycae073. [PMID: 38808121 PMCID: PMC11131428 DOI: 10.1093/ismeco/ycae073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 05/09/2024] [Accepted: 05/12/2024] [Indexed: 05/30/2024]
Abstract
Plants host a large array of commensal bacteria that interact with the host. The growth of both bacteria and plants is often dependent on nutrients derived from the cognate partners, and the bacteria fine-tune host immunity against pathogens. This ancient interaction is common in all studied land plants and is critical for proper plant health and development. We hypothesized that the spatial vicinity and the long-term relationships between plants and their microbiota may promote cross-kingdom horizontal gene transfer (HGT), a phenomenon that is relatively rare in nature. To test this hypothesis, we analyzed the Arabidopsis thaliana genome and its extensively sequenced microbiome to detect events of horizontal transfer of full-length genes that transferred between plants and bacteria. Interestingly, we detected 75 unique genes that were horizontally transferred between plants and bacteria. Plants and bacteria exchange in both directions genes that are enriched in carbohydrate metabolism functions, and bacteria transferred to plants genes that are enriched in auxin biosynthesis genes. Next, we provided a proof of concept for the functional similarity between a horizontally transferred bacterial gene and its Arabidopsis homologue in planta. The Arabidopsis DET2 gene is essential for biosynthesis of the brassinosteroid phytohormones, and loss of function of the gene leads to dwarfism. We found that expression of the DET2 homologue from Leifsonia bacteria of the Actinobacteria phylum in the Arabidopsis det2 background complements the mutant and leads to normal plant growth. Together, these data suggest that cross-kingdom HGT events shape the metabolic capabilities and interactions between plants and bacteria.
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Affiliation(s)
- Shelly Haimlich
- The Department of Plant Pathology and Microbiology, Institute of Environmental Science, Robert H. Smith Faculty of Agriculture, Food, and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel
| | - Yulia Fridman
- Faculty of Biology, Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Hitaishi Khandal
- Faculty of Biology, Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | | | - Asaf Levy
- The Department of Plant Pathology and Microbiology, Institute of Environmental Science, Robert H. Smith Faculty of Agriculture, Food, and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel
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Wei W, Guan D, Ma M, Jiang X, Fan F, Meng F, Li L, Zhao B, Zhao Y, Cao F, Chen H, Li J. Long-term fertilization coupled with rhizobium inoculation promotes soybean yield and alters soil bacterial community composition. Front Microbiol 2023; 14:1161983. [PMID: 37275141 PMCID: PMC10232743 DOI: 10.3389/fmicb.2023.1161983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 04/12/2023] [Indexed: 06/07/2023] Open
Abstract
Microbial diversity is an important indicator of soil fertility and plays an indispensable role in farmland ecosystem sustainability. The short-term effects of fertilization and rhizobium inoculation on soil microbial diversity and community structure have been explored extensively; however, few studies have evaluated their long-term effects. Here, we applied quantitative polymerase chain reaction (qPCR) and amplicon sequencing to characterize the effect of 10-year fertilizer and rhizobium inoculation on bacterial communities in soybean bulk and rhizosphere soils at the flowering-podding and maturity stages. Four treatments were examined: non-fertilization control (CK), phosphorus and potassium fertilization (PK), nitrogen and PK fertilization (PK + N), and PK fertilization and Bradyrhizobium japonicum 5821 (PK + R). Long-term co-application of rhizobium and PK promoted soybean nodule dry weight by 33.94% compared with PK + N, and increased soybean yield by average of 32.25%, 5.90%, and 5.00% compared with CK, PK, and PK + N, respectively. The pH of PK + R was significantly higher than that of PK and PK + N at the flowering-podding stage. The bacterial abundance at the flowering-podding stage was positively correlated with soybean yield, but not at the maturity stage. The significant different class Gemmatimonadetes, and the genera Gemmatimonas, and Ellin6067 in soil at the flowering-podding stage were negatively correlated with soybean yield. However, the bacterial community at class and genus levels at maturity had no significant effect on soybean yield. The key bacterial communities that determine soybean yield were concentrated in the flowering-podding stage, not at maturity stage. Rhizosphere effect, growth period, and treatment synergies resulted in significant differences in soil bacterial community composition. Soil organic matter (OM), total nitrogen (TN), pH, and available phosphorus (AP) were the main variables affecting bacterial community structure. Overall, long-term co-application of rhizobium and fertilizer not only increased soybean yield, but also altered soil bacterial community structure through niche reconstruction and microbial interaction. Rhizobium inoculation plays key role in reducing nitrogen fertilizer application and promoting sustainable agriculture practices.
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Affiliation(s)
- Wanling Wei
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Dawei Guan
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Mingchao Ma
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products (Beijing), Ministry of Agriculture, Beijing, China
| | - Xin Jiang
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products (Beijing), Ministry of Agriculture, Beijing, China
| | - Fenliang Fan
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Fangang Meng
- Soybean Research Institute, Jilin Academy of Agricultural Sciences, Jilin, China
| | - Li Li
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products (Beijing), Ministry of Agriculture, Beijing, China
| | - Baisuo Zhao
- Laboratory of Quality & Safety Risk Assessment for Microbial Products (Beijing), Ministry of Agriculture, Beijing, China
| | - Yubin Zhao
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Fengming Cao
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products (Beijing), Ministry of Agriculture, Beijing, China
| | - Huijun Chen
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jun Li
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products (Beijing), Ministry of Agriculture, Beijing, China
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Silva AMM, Estrada-Bonilla GA, Lopes CM, Matteoli FP, Cotta SR, Feiler HP, Rodrigues YF, Cardoso EJBN. Does Organomineral Fertilizer Combined with Phosphate-Solubilizing Bacteria in Sugarcane Modulate Soil Microbial Community and Functions? MICROBIAL ECOLOGY 2022; 84:539-555. [PMID: 34498120 DOI: 10.1007/s00248-021-01855-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Abstract
Soil bacterial and fungal communities are suitable soil ecosystem health indicators due to their sensitivity to management practices and their role in soil ecosystem processes. Here, information on composition and functions of bacterial and fungal communities were evaluated at two phenological stages of sugarcane (six and twelve months, equivalent to the most intensive vegetative stage and to final maturation, respectively) when organomineral fertilizer, combined with phosphate-solubilizing bacteria (PSB), was added into the soil. Organic compost enriched with apatite (C + A) or phosphorite (C + P) and compost without phosphate enrichment (C) were used in the presence or absence of PSB. In addition, we used a control fertilized with soluble triple superphosphate. The differences were more related to the sampling period than to the type of organomineral fertilizer, being observed higher available phosphorus at six months than at twelve months. Only in the C treatment we observed the presence of Bacillaceae and Planococcaceae, while Pseudomonadaceae were only prevalent in inoculated C + A. As for fungi, the genera Chaetomium and Achroiostachys were only present in inoculated C + P, while the genus Naganishia was most evident in inoculated C + A and in uninoculated C + P. Soliccocozyma represented 75% of the total fungal abundance in uninoculated C while in inoculated C, it represented 45%. The bacterial community was more related to the degradation of easily decomposable organic compounds, while the fungal community was more related to degradation of complex organic compounds. Although the microbial community showed a resilient trait, subtle changes were detected in microbial community composition and function, and this may be related to the increase in yield observed.
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Affiliation(s)
- Antonio Marcos Miranda Silva
- "Luiz de Queiroz" College of Agriculture, University of São Paulo, Soil Science Department, Piracicaba, São Paulo, Brazil
| | - German A Estrada-Bonilla
- Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA) - C.I. Tibaitatá, Mosquera, Cundinamarca, Colombia.
| | - Cíntia Masuco Lopes
- "Luiz de Queiroz" College of Agriculture, University of São Paulo, Soil Science Department, Piracicaba, São Paulo, Brazil
| | - Filipe Pereira Matteoli
- "Luiz de Queiroz" College of Agriculture, University of São Paulo, Soil Science Department, Piracicaba, São Paulo, Brazil
| | - Simone Raposo Cotta
- Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, São Paulo, Brazil
| | - Henrique Petry Feiler
- "Luiz de Queiroz" College of Agriculture, University of São Paulo, Soil Science Department, Piracicaba, São Paulo, Brazil
| | - Yasmin Florentino Rodrigues
- "Luiz de Queiroz" College of Agriculture, University of São Paulo, Soil Science Department, Piracicaba, São Paulo, Brazil
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Jiménez-Mejía R, Medina-Estrada RI, Carballar-Hernández S, Orozco-Mosqueda MDC, Santoyo G, Loeza-Lara PD. Teamwork to Survive in Hostile Soils: Use of Plant Growth-Promoting Bacteria to Ameliorate Soil Salinity Stress in Crops. Microorganisms 2022; 10:150. [PMID: 35056599 PMCID: PMC8781547 DOI: 10.3390/microorganisms10010150] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/06/2022] [Accepted: 01/07/2022] [Indexed: 11/30/2022] Open
Abstract
Plants and their microbiomes, including plant growth-promoting bacteria (PGPB), can work as a team to reduce the adverse effects of different types of stress, including drought, heat, cold, and heavy metals stresses, as well as salinity in soils. These abiotic stresses are reviewed here, with an emphasis on salinity and its negative consequences on crops, due to their wide presence in cultivable soils around the world. Likewise, the factors that stimulate the salinity of soils and their impact on microbial diversity and plant physiology were also analyzed. In addition, the saline soils that exist in Mexico were analyzed as a case study. We also made some proposals for a more extensive use of bacterial bioinoculants in agriculture, particularly in developing countries. Finally, PGPB are highly relevant and extremely helpful in counteracting the toxic effects of soil salinity and improving crop growth and production; therefore, their use should be intensively promoted.
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Affiliation(s)
- Rafael Jiménez-Mejía
- Licenciatura en Genómica Alimentaria, Universidad de La Ciénega del Estado de Michoacán de Ocampo (UCEMICH), Sahuayo 59103, Mexico; (R.J.-M.); (R.I.M.-E.); (S.C.-H.)
| | - Ricardo I. Medina-Estrada
- Licenciatura en Genómica Alimentaria, Universidad de La Ciénega del Estado de Michoacán de Ocampo (UCEMICH), Sahuayo 59103, Mexico; (R.J.-M.); (R.I.M.-E.); (S.C.-H.)
| | - Santos Carballar-Hernández
- Licenciatura en Genómica Alimentaria, Universidad de La Ciénega del Estado de Michoacán de Ocampo (UCEMICH), Sahuayo 59103, Mexico; (R.J.-M.); (R.I.M.-E.); (S.C.-H.)
| | - Ma. del Carmen Orozco-Mosqueda
- Facultad de Agrobiología “Presidente Juárez”, Universidad Michoacana de San Nicolás de Hidalgo (UMSNH), Uruapan 60170, Mexico;
| | - Gustavo Santoyo
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo (UMSNH), Morelia 58030, Mexico;
| | - Pedro D. Loeza-Lara
- Licenciatura en Genómica Alimentaria, Universidad de La Ciénega del Estado de Michoacán de Ocampo (UCEMICH), Sahuayo 59103, Mexico; (R.J.-M.); (R.I.M.-E.); (S.C.-H.)
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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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Basit A, Shah ST, Ullah I, Muntha ST, Mohamed HI. Microbe-assisted phytoremediation of environmental pollutants and energy recycling in sustainable agriculture. Arch Microbiol 2021; 203:5859-5885. [PMID: 34545411 DOI: 10.1007/s00203-021-02576-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/25/2021] [Accepted: 09/12/2021] [Indexed: 01/17/2023]
Abstract
The perception of phytoremediation is efficiently utilized as an eco-friendly practice of green plants combating and cleaning up the stressed environment without harming it. The industrial revolution was followed by the green revolution which fulfilled the food demands of the growing population caused an increase in yield per unit area in crop production, but it also increased the use of synthetic fertilizers in agriculture. Globally, the intensive use of inorganic fertilizers in agriculture has led to serious health problems and irreversible environmental damage. Biofertilizers improve the growth of the plant and can be applied as an alternative to chemical/synthetic fertilizers. Cyanobacteria, bacteria, and fungi are known as some of the principal microbe groups used to produce biofertilizers that form symbiotic associations with plants. Microorganisms perform a key role in phosphate solubilization and mobilization, nitrogen fixation, nutrient management, biotic elicitors and probiotics, and pollution management (biodegradation agents), specifically bacteria which also help in atmospheric nitrogen fixation and are thus available for the growth of the plant. Management or biodegradation of hazardous chemical residues and heavy metals produced by a huge number of large-scale industries should be given primary importance to be transformed by various bacterial strains, fungi, algae. Currently, modern omics technologies such as metagenomic, transcriptomic, and proteomic are being used to develop strategies for studying the ecology of microorganisms, as well as their use in environmental monitoring and bioremediation. This review briefly discusses some of the major groups of microorganisms that can perform different functions responsible for plant health, crop production, phytoremediation and also focus on the omics techniques reportedly used in environmental monitoring to tackle the pollution load.
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Affiliation(s)
- Abdul Basit
- Department of Horticulture, Faculty of Crop Production, The University of Agriculture Peshawar, Peshawar, 25120, Pakistan
| | - Syed Tanveer Shah
- Department of Horticulture, Faculty of Crop Production, The University of Agriculture Peshawar, Peshawar, 25120, Pakistan
| | - Izhar Ullah
- Department of Horticulture, Faculty of Crop Production, The University of Agriculture Peshawar, Peshawar, 25120, Pakistan
| | - Sidra Tul Muntha
- Laboratory of Germplasm Innovation and Molecular Breeding, Institute of Vegetable Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Heba I Mohamed
- Department of Biological and Geological Sciences, Faculty of Education, Ain Shams University, Cairo, Egypt.
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Ali SS, Kornaros M, Manni A, Al-Tohamy R, El-Shanshoury AERR, Matter IM, Elsamahy T, Sobhy M, Sun J. Advances in microorganisms-based biofertilizers: Major mechanisms and applications. BIOFERTILIZERS 2021:371-385. [DOI: 10.1016/b978-0-12-821667-5.00023-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Lebrazi S, Niehaus K, Bednarz H, Fadil M, Chraibi M, Fikri-Benbrahim K. Screening and optimization of indole-3-acetic acid production and phosphate solubilization by rhizobacterial strains isolated from Acacia cyanophylla root nodules and their effects on its plant growth. J Genet Eng Biotechnol 2020; 18:71. [PMID: 33175273 PMCID: PMC7658270 DOI: 10.1186/s43141-020-00090-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 11/02/2020] [Indexed: 11/18/2022]
Abstract
Background Plant growth-promoting rhizobacteria (PGPR) are known to improve plant growth and are used as biofertilizers, thanks to their numerous benefits to agriculture such as phosphorus solubilization and phytohormone production. In this paper, four rhizospheric bacteria (Phyllobacterium sp., Bacillus sp., Agrobacterium sp., and Rhizobium sp.) isolated from surface-sterilized root nodules of Acacia cyanophylla were tested for their ability to solubilize inorganic phosphate and to produce indole-3-acetic acid (IAA) under laboratory conditions. Then, the best IAA producer (Rhizobium sp.) was selected to test optimized conditions for IAA production. Finally, the effect of the four strains on plant growth for A. cyanophylla was evaluated in vivo. Results The results showed that the totality of the tested isolates had solubilized inorganic phosphate (P) in both NBRIP (National Botanical Research Institute Phosphate) and PVK (Pikovskaya) media. Bacillus sp. was a high P-solubilizer and showed maximum solubilization in PVK (519 μg ml-1) and NBRIP (782 μg ml-1). The optimization of maximum phosphate solubilization was done using different sources of carbon (1%) and nitrogen (0.1%). Glucose and ammonium sulfate were selected to be the best carbon and nitrogen source for phosphate solubilization by all tested strains, except for Phyllobacterium sp., which recorded the highest phosphate solubilization with ammonium nitrate. The IAA production by the tested strains indicated that Rhizobium sp. produced the highest amount of IAA (90.21 μg ml-1) in culture media supplemented with L-tryptophan. The best production was observed with L-Trp concentration of 0.2% (116.42 μg ml-1) and at an initial pH of 9 (116.07 μg ml-1). The effect of NaCl on IAA production was tested at concentrations of 0 to 5% and the maximum production of 89.43 μg ml-1 was found at 2% NaCl. The extraction of crude IAA from this strain was done and purity was confirmed with Thin Layer Chromatography (TLC) analysis. A specific spot from the extracted IAA production was found to correspond with a standard spot of IAA with the same Rf value. Finally, the tested PGPR demonstrated growth stimulatory effects on Acacia cyanophylla seedlings in vivo, with a great increase of shoots’ and roots’ dry weights, and shoot length compared to control. The rhizobacterial isolates were identified by 16S rDNA sequence analysis as Agrobacterium sp. NA11001, Phyllobacterium sp. C65, Bacillus sp. CS14, and Rhizobium sp. V3E1. Conclusion This study highlights the importance of the use of phosphate solubilizing and IAA producer microorganisms as biofertilizers to increase crop yields. The studied strains showed a significant phosphate solubilization potential and IAA production. The use of selected strains as inoculants would be interesting, in particular with a view of promoting sustainable agriculture. However, further studies to verify the efficacy of the best isolates in situ is certainly required.
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Affiliation(s)
- Sara Lebrazi
- Laboratory of Microbial Biotechnology, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, P.O. Box 2202, Fez, Morocco.
| | - Karsten Niehaus
- Proteome and Metabolome Research, Faculty of Biology Center for Biotechnology (CeBiTec), Bielefeld, Germany
| | - Hanna Bednarz
- Proteome and Metabolome Research, Faculty of Biology Center for Biotechnology (CeBiTec), Bielefeld, Germany
| | - Mouhcine Fadil
- Physico-Chemical Laboratory of Inorganic and Organic Materials, Materials Science Center (MSC), Ecole Normale Supérieure, Mohammed V University in Rabat, Rabat, Morocco
| | - Marwa Chraibi
- Laboratory of Microbial Biotechnology, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, P.O. Box 2202, Fez, Morocco
| | - Kawtar Fikri-Benbrahim
- Laboratory of Microbial Biotechnology, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, P.O. Box 2202, Fez, Morocco
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Chen H, Zhao S, Zhao J, Zhang K, Jiang J, Guan Z, Chen S, Chen F, Fang W. Deep tillage combined with biofertilizer following soil fumigation improved chrysanthemum growth by regulating the soil microbiome. Microbiologyopen 2020; 9:e1045. [PMID: 32323930 PMCID: PMC7349168 DOI: 10.1002/mbo3.1045] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 03/23/2020] [Accepted: 03/28/2020] [Indexed: 12/21/2022] Open
Abstract
Sustained monoculture often leads to the inhibition of plant growth, the decrease of the soil microbial diversity, and changes in soil microbial community composition, particularly to the accumulation of soil‐borne pathogens. In this study, we conducted field experiments to investigate the practical effects of tilling the soil down to a depth of 40 cm (40dp) in combination with dazomet (D) soil fumigation and/or the application of a bio‐organic fertilizer (B) on chrysanthemum growth, with a focus on the potential mechanisms underlying the responses of the soil microbiome. The growth indices of chrysanthemum were significantly (p < .05) increased in the DB + 40dp treatment compared to that in other treatments. The weighted and unweighted UniFrac distances in the principal coordinate analysis (PCoA) revealed that soil bacterial and fungal community compositions were separated according to the treatments. The abundance of genera potentially expressing growth promotion, such as Pseudomonas and Bacillus, was increased in the DB + 40dp treatment. In addition, the combined DB + 40dp treatment enhanced the activities of catalase, urease, sucrase, and β‐d‐glucosidase, and significantly increased the levels of available nitrogen, phosphorus, and potassium in the soil. The redundancy analysis (RDA) implied that the composition of the microbiome was correlated to soil enzymatic activities and soil potassium availability in the rhizosphere soil of chrysanthemum plants. Our findings suggest that the DB + 40dp treatment is a better strategy for improving chrysanthemum growth and regulating the rhizosphere microbiome in monoculture soils than the methods presently employed by commercial chrysanthemum producers.
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Affiliation(s)
- Huijie Chen
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, College of Horticulture, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China
| | - Shuang Zhao
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, College of Horticulture, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China
| | - Jiamiao Zhao
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, College of Horticulture, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China
| | - Kaikai Zhang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, College of Horticulture, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China
| | - Jing Jiang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, College of Horticulture, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China
| | - Zhiyong Guan
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, College of Horticulture, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China
| | - Sumei Chen
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, College of Horticulture, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China
| | - Fadi Chen
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, College of Horticulture, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China
| | - Weimin Fang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, College of Horticulture, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing, China
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12
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Galindo FS, Filho MCMT, Buzetti S, Rodrigues WL, Fernandes GC, Boleta EHM, Neto MB, Pereira MRDA, Rosa PAL, Pereira ÍT, Gaspareto RN. Influence of Azospirillum brasilense associated with silicon and nitrogen fertilization on macronutrient contents in corn. OPEN AGRICULTURE 2020. [DOI: 10.1515/opag-2020-0013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Abstract
Information regarding the interaction between biological nitrogen fixation (BNF) with Azospirillum brasilense inoculation and the use of silicon (Si) is needed. Silicon exerts numerous benefits on grasses, especially when the plants are subjected to biotic and abiotic stresses, affecting plant nutrition. The aim of this research was to determine if there is a synergistic effect between the inoculation with A. brasilense and Si use, on macro-nutrient content in corn shoot and root. The field trial was performed in Selvíria, Brazil, on a Typic Rhodic Hapludox soil under no-till system. The experimental design was a completely randomized block design with four replicates arranged in a 2 × 5 × 2 triple factorial arrangement, consisting of two soil acidity corrective sources (dolomitic limestone and Ca and Mg silicate as sources of Si); five N doses (0, 50, 100, 150 and 200 kg ha-1 applied in topdressing); with and without seed inoculation with A. brasilense. The inoculation favored N concentration in shoots and increased the N and S concentration even when associated to high N rates in topdressing. The Si as Ca and Mg silicate associated with the increment of N rates does not promote an increase in the macronutrients uptake. Although it did not favor the N use, the Si also did not negatively affect the benefits of the A. brasilense.
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Affiliation(s)
- Fernando Shintate Galindo
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Marcelo Carvalho Minhoto Teixeira Filho
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Salatiér Buzetti
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Willian Lima Rodrigues
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Guilherme Carlos Fernandes
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Eduardo Henrique Marcandalli Boleta
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Maurício Barco Neto
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Maikon Richer de Azambuja Pereira
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Poliana Aparecida Leonel Rosa
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Íngrid Torres Pereira
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
| | - Rafaela Neris Gaspareto
- Department of Plant Health, Rural Engineering, and Soils, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista “Júlio de Mesquita Filho” , Ilha Solteira , Sao Paulo State, Zip Code 15385-000 , Brazil
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13
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Galindo FS, Teixeira Filho MCM, Buzetti S, Rodrigues WL, Boleta EHM, Fernandes GC. Silicon as an acidity corrective associated with Azospirillum brasilense to improve nitrogen management and wheat profitability. SEMINA-CIENCIAS AGRARIAS 2020. [DOI: 10.5433/1679-0359.2020v41n2p447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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14
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Galindo FS, Teixeira Filho MCM, Buzetti S, Santini JMK, Montanari R, Freitas LA, Rodrigues WL. Micronutrient Accumulation with Azospirillum Brasilense Associated with Nitrogen Fertilization Management in Wheat. COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS 2019. [DOI: 10.1080/00103624.2019.1667369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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 (DEFERS), São Paulo State University (UNESP), Ilha Solteira, SP, Brazil
| | | | - Salatiér Buzetti
- Department of plant health, rural engineering, and soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, SP, Brazil
| | - José Mateus Kondo Santini
- Department of plant health, rural engineering, and soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, SP, Brazil
| | - Rafael Montanari
- Department of plant health, rural engineering, and soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, SP, Brazil
| | - Leandro Alves Freitas
- Department of plant health, rural engineering, and soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, SP, Brazil
| | - Willian Lima Rodrigues
- Department of plant health, rural engineering, and soils (DEFERS), São Paulo State University (UNESP), Ilha Solteira, SP, Brazil
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15
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Galindo FS, Teixeira Filho MCM, Buzetti S, Pagliari PH, Santini JMK, Alves CJ, Megda MM, Nogueira TAR, Andreotti M, Arf O. Maize Yield Response to Nitrogen Rates and Sources Associated with
Azospirillum brasilense. AGRONOMY JOURNAL 2019. [DOI: 10.2134/agronj2018.07.0481] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Fernando S. Galindo
- Dep. of Plant Protection, Rural Engineering and Soils São Paulo State Univ. Ilha Solteira SP 15.385‐000 Brazil
| | | | - Salatiér Buzetti
- Dep. of Plant Protection, Rural Engineering and Soils São Paulo State Univ. Ilha Solteira SP 15.385‐000 Brazil
| | - Paulo H. Pagliari
- Dep. of Soil, Water, and Climate Univ. of Minnesota, Southwest Research and Outreach Center Lamberton MN 56152
| | - José M. K. Santini
- Dep. of Plant Protection, Rural Engineering and Soils São Paulo State Univ. Ilha Solteira SP 15.385‐000 Brazil
| | | | - Marcio M. Megda
- Montes Claros State Univ. College of Janaúba Janaúba MG Brazil
| | - Thiago A. R. Nogueira
- Dep. of Plant Protection, Rural Engineering and Soils São Paulo State Univ. Ilha Solteira SP 15.385‐000 Brazil
| | - Marcelo Andreotti
- Dep. of Plant Protection, Rural Engineering and Soils São Paulo State Univ. Ilha Solteira SP 15.385‐000 Brazil
| | - Orivaldo Arf
- Dep. of Plant Science, Food Technology and Social Economy São Paulo State Univ. Ilha Solteira SP Brazil
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Gómez-Godínez LJ, Fernandez-Valverde SL, Martinez Romero JC, Martínez-Romero E. Metatranscriptomics and nitrogen fixation from the rhizoplane of maize plantlets inoculated with a group of PGPRs. Syst Appl Microbiol 2019; 42:517-525. [DOI: 10.1016/j.syapm.2019.05.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 05/16/2019] [Accepted: 05/17/2019] [Indexed: 10/26/2022]
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17
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Galindo FS, Teixeira Filho MCM, Buzetti S, Rodrigues WL, Santini JMK, Alves CJ. Nitrogen fertilisation efficiency and wheat grain yield affected by nitrogen doses and sources associated with Azospirillum brasilense. ACTA AGRICULTURAE SCANDINAVICA SECTION B-SOIL AND PLANT SCIENCE 2019. [DOI: 10.1080/09064710.2019.1628293] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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, College of Engineering, São Paulo State University (UNESP), Ilha Solteira-SP, Brazil
| | | | - Salatiér Buzetti
- Department of Plant Health, Rural Engineering, and Soils, College of Engineering, São Paulo State University (UNESP), Ilha Solteira-SP, Brazil
| | - Willian Lima Rodrigues
- Department of Plant Health, Rural Engineering, and Soils, College of Engineering, São Paulo State University (UNESP), Ilha Solteira-SP, Brazil
| | - José Mateus Kondo Santini
- Department of Plant Health, Rural Engineering, and Soils, College of Engineering, São Paulo State University (UNESP), Ilha Solteira-SP, Brazil
| | - Cleiton José Alves
- Department of Crop Science, College of Agricultural Science, São Paulo State University (UNESP), Botucatu-SP, Brazil
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Compant S, Samad A, Faist H, Sessitsch A. A review on the plant microbiome: Ecology, functions, and emerging trends in microbial application. J Adv Res 2019; 19:29-37. [PMID: 31341667 PMCID: PMC6630030 DOI: 10.1016/j.jare.2019.03.004] [Citation(s) in RCA: 470] [Impact Index Per Article: 94.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 03/13/2019] [Accepted: 03/13/2019] [Indexed: 01/06/2023] Open
Abstract
Microbiota are important for plant growth, health and stress resilience. Inoculation with key microbiota members can improve plant traits. Tailored selection and delivery of microbial strains or consortia is required. Microbiome improvement may be achieved by appropriate agro-management practices. Plant breeding for improved interaction with microbiota will be of benefit.
Plants have evolved with a plethora of microorganisms having important roles for plant growth and health. A considerable amount of information is now available on the structure and dynamics of plant microbiota as well as on the functional capacities of isolated community members. Due to the interesting functional potential of plant microbiota as well as due to current challenges in crop production there is an urgent need to bring microbial innovations into practice. Different approaches for microbiome improvement exist. On the one hand microbial strains or strain combinations can be applied, however, field success is often variable and improvement is urgently required. Smart, knowledge-driven selection of microorganisms is needed as well as the use of suitable delivery approaches and formulations. On the other hand, farming practices or the plant genotype can influence plant microbiota and thus functioning. Therefore, selection of appropriate farming practices and plant breeding leading to improved plant-microbiome interactions are avenues to increase the benefit of plant microbiota. In conclusion, different avenues making use of a new generation of inoculants as well as the application of microbiome-based agro-management practices and improved plant lines could lead to a better use of the plant microbiome. This paper reviews the importance and functionalities of the bacterial plant microbiome and discusses challenges and concepts in regard to the application of plant-associated bacteria.
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Affiliation(s)
- Stéphane Compant
- AIT Austrian Institute of Technology GmbH, Center for Health & Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria
| | - Abdul Samad
- AIT Austrian Institute of Technology GmbH, Center for Health & Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria
| | - Hanna Faist
- AIT Austrian Institute of Technology GmbH, Center for Health & Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria
| | - Angela Sessitsch
- AIT Austrian Institute of Technology GmbH, Center for Health & Bioresources, Bioresources Unit, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria
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Souza EMD, Galindo FS, Teixeira Filho MCM, Silva PRTD, Santos ACD, Fernandes GC. Does the nitrogen application associated with Azospirillum brasilense inoculation influence corn nutrition and yield? REVISTA BRASILEIRA DE ENGENHARIA AGRICOLA E AMBIENTAL 2019. [DOI: 10.1590/1807-1929/agriambi.v23n1p53-59] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
ABSTRACT The aim of this study was to investigate the synergistic effect between inoculation with Azospirillum brasilense and nitrogen application, thus enabling a higher efficiency of nitrogen fertilization, as evaluated by nutritional value, components production, and grain yield of irrigated corn. The experiment was conducted in Selvíria, MS, Brazil, under a no-till system, on an Oxisol in the Brazilian Cerrado. The experiment was set up in a randomized block design with four replications, in a 4 × 2 factorial arrangement: four patterns of nitrogen application [application of 30 kg ha-1 of N at sowing and 150 kg ha-1 as cover (30 + 150); 30 kg ha-1 of N at sowing, split into two applications of 75 kg ha-1 as cover (30 + 75 + 75); 180 kg ha-1 of N at sowing (180); and 150 kg ha-1 of N at sowing and 30 kg ha-1 as cover (150 + 30)]; with and without inoculation of the seeds with A. brasilense. The application of 30 kg ha-1 of N at sowing and a single application of 150 kg ha-1 or two applications of 75 kg ha-1 in topdressing, inoculated with Azospirillum brasilense provided better nutrition and development, with a positive reflection on irrigated corn grain yield in the Brazilian Cerrado.
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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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Shintate Galindo F, Teixeira Filho MCM, Buzetti S, Rodrigues WL, Fernandes GC, Marcandalli Boleta EH, Barco Neto M, Campos Biagini AL, Bianchi Baratella E, Silva de Souza J. Nitrogen rates associated with the inoculation of Azospirillum brasilense and application of Si: Effects on micronutrients and silicon concentration in irrigated corn. OPEN AGRICULTURE 2018. [DOI: 10.1515/opag-2018-0056] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Abstract
The aim of this study was to analyze whether there are differences between the inoculation with Azospirillum brasilense and the silicon application, thus enabling a higher efficiency of nitrogen fertilization, evaluating micronutrients and silicon concentration in shoots and roots of irrigated corn (Zea mays). The experiment was conducted in Selviria, Brazil, under a no-till system, on a Typic Rhodic Hapludox. The experiment was set up as a randomized block design with four replications, in a 2 × 5 × 2 factorial arrangement consisting of two soil corrective sources (dolomitic limestone and Ca and Mg silicate as source of Si); five N rates (0, 50, 100, 150 and 200 kg ha-1); with and without inoculation with A. brasilense. N rates increased B, Cu and Fe concentrations in shoots and B, Cu, Fe, Mn, Zn and Si in roots. Inoculation provided greater concentrations of B and Fe in shoots, and B in roots. Although inoculation with A. brasilense favored micronutrient uptake, it negatively affected Si concentration in shoots in 2015/16 crop. The use of Si in the form of Ca and Mg silicate promotes an increase in Mn, Si and Zn uptake in shoots and Mn and Si concentration in roots.
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Preininger C, Sauer U, Bejarano A, Berninger T. Concepts and applications of foliar spray for microbial inoculants. Appl Microbiol Biotechnol 2018; 102:7265-7282. [PMID: 29961100 DOI: 10.1007/s00253-018-9173-4] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 06/12/2018] [Accepted: 06/13/2018] [Indexed: 11/27/2022]
Abstract
Damages of the (agro)ecosystem by extensive use of chemical fertilizers and pesticides, the global dying of bee populations possibly linked to pesticide spraying, and stricter regulations for pesticide use together with successful use of microbials in IPM programs are pushing on the development and commercialization of new microbial products and a large and growing biostimulants and biocontrol market. This review focuses on microbial inoculants including bacteria, fungi, and viruses used as biostimulant or biocontrol agent for foliar application and covers all important steps from inoculant development to successful field application. Topics presented comprise typical spraying equipment including the importance of the spraying process and relating effects, furthermore formulation development including classification and adjuvants, and thirdly regulatory aspects as currently applied or under discussion. Microbial inoculants for foliar spray reported in scientific literature are summarized and contrasted with selected commercial products. Special attention is given to factors most important in microbial spray: (a) type of active ingredient (bacteria, fungi, viruses), (b) mode of action (ingestion, contact, competition), (c) interaction with the plant leaf surface, (d) droplet size in terms of microbe concentration and leaf coverage, and (e) environmental conditions during spraying. Finally, we want to emphasize that timely administration is of utmost importance for successful spraying and maximum efficacy. This might be supported by weather stations and disease/pest models as an important step towards precision farming.
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Affiliation(s)
- Claudia Preininger
- Center for Health & Bioresources, AIT Austrian Institute of Technology GmbH, Konrad-Lorenz-Strasse 24, 3430, Tulln, Austria.
| | - Ursula Sauer
- Center for Health & Bioresources, AIT Austrian Institute of Technology GmbH, Konrad-Lorenz-Strasse 24, 3430, Tulln, Austria
| | - Ana Bejarano
- Center for Health & Bioresources, AIT Austrian Institute of Technology GmbH, Konrad-Lorenz-Strasse 24, 3430, Tulln, Austria
| | - Teresa Berninger
- Center for Health & Bioresources, AIT Austrian Institute of Technology GmbH, Konrad-Lorenz-Strasse 24, 3430, Tulln, Austria
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Multifunctional potential of endophytic and rhizospheric microbial isolates associated with Butia purpurascens roots for promoting plant growth. Antonie van Leeuwenhoek 2018; 111:2157-2174. [DOI: 10.1007/s10482-018-1108-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 05/24/2018] [Indexed: 01/29/2023]
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24
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Fukami J, Cerezini P, Hungria M. Azospirillum: benefits that go far beyond biological nitrogen fixation. AMB Express 2018; 8:73. [PMID: 29728787 PMCID: PMC5935603 DOI: 10.1186/s13568-018-0608-1] [Citation(s) in RCA: 116] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 04/30/2018] [Indexed: 12/25/2022] Open
Abstract
The genus Azospirillum comprises plant-growth-promoting bacteria (PGPB), which have been broadly studied. The benefits to plants by inoculation with Azospirillum have been primarily attributed to its capacity to fix atmospheric nitrogen, but also to its capacity to synthesize phytohormones, in particular indole-3-acetic acid. Recently, an increasing number of studies has attributed an important role of Azospirillum in conferring to plants tolerance of abiotic and biotic stresses, which may be mediated by phytohormones acting as signaling molecules. Tolerance of biotic stresses is controlled by mechanisms of induced systemic resistance, mediated by increased levels of phytohormones in the jasmonic acid/ethylene pathway, independent of salicylic acid (SA), whereas in the systemic acquired resistance-a mechanism previously studied with phytopathogens-it is controlled by intermediate levels of SA. Both mechanisms are related to the NPR1 protein, acting as a co-activator in the induction of defense genes. Azospirillum can also promote plant growth by mechanisms of tolerance of abiotic stresses, named as induced systemic tolerance, mediated by antioxidants, osmotic adjustment, production of phytohormones, and defense strategies such as the expression of pathogenesis-related genes. The study of the mechanisms triggered by Azospirillum in plants can help in the search for more-sustainable agricultural practices and possibly reveal the use of PGPB as a major strategy to mitigate the effects of biotic and abiotic stresses on agricultural productivity.
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Affiliation(s)
- Josiane Fukami
- Embrapa Soja, C.P. 231, Londrina, Paraná 86001-970 Brazil
- Department Biochemistry and Biotechnology, Universidade Estadual de Londrina, C.P. 60001, Londrina, Paraná 86051-990 Brazil
| | - Paula Cerezini
- Embrapa Soja, C.P. 231, Londrina, Paraná 86001-970 Brazil
| | - Mariangela Hungria
- Embrapa Soja, C.P. 231, Londrina, Paraná 86001-970 Brazil
- Department Biochemistry and Biotechnology, Universidade Estadual de Londrina, C.P. 60001, Londrina, Paraná 86051-990 Brazil
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Successful Formulation and Application of Plant Growth-Promoting Kosakonia radicincitans in Maize Cultivation. BIOMED RESEARCH INTERNATIONAL 2018; 2018:6439481. [PMID: 29789802 PMCID: PMC5896250 DOI: 10.1155/2018/6439481] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 01/29/2018] [Accepted: 02/18/2018] [Indexed: 12/21/2022]
Abstract
The global market for biosupplements is expected to grow by 14 percent between 2014 and 2019 as a consequence of the proven benefits of biosupplements on crop yields, soil fertility, and fertilizer efficiency. One important segment of biosupplements is plant growth-promoting bacteria (PGPB). Although many potential PGPB have been discovered, suitable biotechnological processing and shelf-life stability of the bacteria are challenges to overcome for their successful use as biosupplements. Here, the plant growth-promoting Gram-negative strain Kosakonia radicincitans DSM 16656T (family Enterobacteriaceae) was biotechnologically processed and applied in the field. Solid or liquid formulations of K. radicincitans were diluted in water and sprayed on young maize plants (Zea mays L.). Shelf-life stability tests of formulated bacteria were performed under 4°C and −20°C storage conditions. In parallel, the bacterial formulations were tested at three different farm level field plots characterized by different soil properties. Maize yield was recorded at harvest time, and both formulations increased maize yields in silage as well as grain maize, underlining their positive impact on different agricultural systems. Our results demonstrate that bacteria of the family Enterobacteriaceae, although incapable of forming spores, can be processed to successful biosupplements.
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Fukami J, Ollero FJ, Megías M, Hungria M. Phytohormones and induction of plant-stress tolerance and defense genes by seed and foliar inoculation with Azospirillum brasilense cells and metabolites promote maize growth. AMB Express 2017; 7:153. [PMID: 28724262 PMCID: PMC5514007 DOI: 10.1186/s13568-017-0453-7] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 07/11/2017] [Indexed: 11/29/2022] Open
Abstract
Azospirillum spp. are plant-growth-promoting bacteria used worldwide as inoculants for a variety of crops. Among the beneficial mechanisms associated with Azospirillum inoculation, emphasis has been given to the biological nitrogen fixation process and to the synthesis of phytohormones. In Brazil, the application of inoculants containing A. brasilense strains Ab-V5 and Ab-V6 to cereals is exponentially growing and in this study we investigated the effects of maize inoculation with these two strains applied on seeds or by leaf spray at the V2.5 stage growth—a strategy to relieve incompatibility with pesticides used for seed treatment. We also investigate the effects of spraying the metabolites of these two strains at V2.5. Maize growth was promoted by the inoculation of bacteria and their metabolites. When applied via foliar spray, although A. brasilense survival on leaves was confirmed by confocal microscopy and cell recovery, few cells were detected after 24 h, indicating that the effects of bacterial leaf spray might also be related to their metabolites. The major molecules detected in the supernatants of both strains were indole-3-acetic acid, indole-3-ethanol, indole-3-lactic acid and salicylic acid. RT-PCR of genes related to oxidative stress (APX1, APX2, CAT1, SOD2, SOD4) and plant defense (pathogenesis-related PR1, prp2 and prp4) was evaluated on maize leaves and roots. Differences were observed according to the gene, plant tissue, strain and method of application, but, in general, inoculation with Azospirillum resulted in up-regulation of oxidative stress genes in leaves and down-regulation in roots; contrarily, in general, PR genes were down-regulated in leaves and up-regulated in roots. Emphasis should be given to the application of metabolites, especially of Ab-V5 + Ab-V6 that in general resulted in the highest up-regulation of oxidative-stress and PR genes both in leaves and in roots. We hypothesize that the benefits of inoculation of Azospirillum on seeds or by leaf spray, as well as of leaf spraying of Azospirillum metabolites, are strongly correlated with the synthesis of phytohormones and by eliciting genes related to plant-stress tolerance and defense against pathogens.
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27
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Berger B, Baldermann S, Ruppel S. The plant growth-promoting bacterium Kosakonia radicincitans improves fruit yield and quality of Solanum lycopersicum. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:4865-4871. [PMID: 28382622 DOI: 10.1002/jsfa.8357] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 03/30/2017] [Accepted: 04/01/2017] [Indexed: 05/25/2023]
Abstract
BACKGROUND Production and the quality of tomato fruits have a strong economic relevance. Microorganisms such as the plant growth-promoting bacterium (PGPB) Kosakonia radicincitans (DSM 16656) have been demonstrated to improve shoot and root growth of young tomato plants, but data on yield increase and fruit quality by K. radicincitans are lacking. RESULTS This study investigated how K. radicincitans affects tomato fruits. After inoculation of tomato seeds with K. radicincitans or a sodium chloride buffer control solution, stalk length, first flowering and the amount of ripened fruits produced by inoculated and non-inoculated plants were monitored over a period of 21 weeks. Inoculation of tomato seeds with K. radicincitans accelerated flowering and ripening of tomato fruits. Sugars, acidity, amino acids, volatile organic compounds and carotenoids in the fruits were also analyzed. CONCLUSION It was found that the PGPB K. radicincitans affected the amino acid, sugar and volatile composition of ripened fruits, contributing to a more pleasant-tasting fruit without forfeiting selected quality indicators. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Beatrice Berger
- Leibniz-Institute of Vegetable and Ornamental Crops e.V., Grossbeeren, Germany
| | - Susanne Baldermann
- Leibniz-Institute of Vegetable and Ornamental Crops e.V., Grossbeeren, Germany
- Institute of Nutritional Science, University of Potsdam, Nuthetal, Germany
| | - Silke Ruppel
- Leibniz-Institute of Vegetable and Ornamental Crops e.V., Grossbeeren, Germany
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28
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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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29
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Fukami J, Abrantes JLF, del Cerro P, Nogueira MA, Ollero FJ, Megías M, Hungria M. Revealing strategies of quorum sensing in Azospirillum brasilense strains Ab-V5 and Ab-V6. Arch Microbiol 2017; 200:47-56. [DOI: 10.1007/s00203-017-1422-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 07/21/2017] [Accepted: 07/30/2017] [Indexed: 11/24/2022]
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Baas P, Bell C, Mancini LM, Lee MN, Conant RT, Wallenstein MD. Phosphorus mobilizing consortium Mammoth P(™) enhances plant growth. PeerJ 2016; 4:e2121. [PMID: 27326379 PMCID: PMC4911952 DOI: 10.7717/peerj.2121] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 05/18/2016] [Indexed: 12/25/2022] Open
Abstract
Phosphorus (P) is a critical nutrient used to maximize plant growth and yield. Current agriculture management practices commonly experience low plant P use efficiency due to natural chemical sorption and transformations when P fertilizer is applied to soils. A perplexing challenge facing agriculture production is finding sustainable solutions to deliver P more efficiently to plants. Using prescribed applications of specific soil microbial assemblages to mobilize soil bound—P to improve crop nutrient uptake and productivity has rarely been employed. We investigated whether inoculation of soils with a bacterial consortium developed to mobilize soil P, named Mammoth PTM, could increase plant productivity. In turf, herbs, and fruits, the combination of conventional inorganic fertilizer combined with Mammoth PTM increased productivity up to twofold compared to the fertilizer treatments without the Mammoth PTM inoculant. Jalapeño plants were found to bloom more rapidly when treated with either Mammoth P. In wheat trials, we found that Mammoth PTM by itself was able to deliver yields equivalent to those achieved with conventional inorganic fertilizer applications and improved productivity more than another biostimulant product. Results from this study indicate the substantial potential of Mammoth PTM to enhance plant growth and crop productivity.
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Affiliation(s)
- Peter Baas
- Growcentia, Inc. , Fort Collins , CO , United States
| | - Colin Bell
- Growcentia, Inc. , Fort Collins , CO , United States
| | | | - Melanie N Lee
- Growcentia, Inc. , Fort Collins , CO , United States
| | - Richard T Conant
- Natural Resource Ecology Laboratory, Colorado State University , Fort Collins , CO , United States
| | - Matthew D Wallenstein
- Natural Resource Ecology Laboratory, Colorado State University , Fort Collins , CO , United States
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Marcelino PRF, Milani KML, Mali S, Santos OJAPD, de Oliveira ALM. Formulations of polymeric biodegradable low-cost foam by melt extrusion to deliver plant growth-promoting bacteria in agricultural systems. Appl Microbiol Biotechnol 2016; 100:7323-38. [DOI: 10.1007/s00253-016-7566-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 04/11/2016] [Accepted: 04/18/2016] [Indexed: 10/21/2022]
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32
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del Cerro P, Rolla-Santos AAP, Valderrama-Fernández R, Gil-Serrano A, Bellogín RA, Gomes DF, Pérez-Montaño F, Megías M, Hungría M, Ollero FJ. NrcR, a New Transcriptional Regulator of Rhizobium tropici CIAT 899 Involved in the Legume Root-Nodule Symbiosis. PLoS One 2016; 11:e0154029. [PMID: 27096734 PMCID: PMC4838322 DOI: 10.1371/journal.pone.0154029] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 04/07/2016] [Indexed: 11/19/2022] Open
Abstract
The establishment of nitrogen-fixing rhizobium-legume symbioses requires a highly complex cascade of events. In this molecular dialogue the bacterial NodD transcriptional regulators in conjunction with plant inducers, mostly flavonoids, are responsible for the biosynthesis and secretion of Nod factors which are key molecules for successful nodulation. Other transcriptional regulators related to the symbiotic process have been identified in rhizobial genomes, including negative regulators such as NolR. Rhizobium tropici CIAT 899 is an important symbiont of common bean (Phaseolus vulgaris L.), and its genome encompasses intriguing features such as five copies of nodD genes, as well as other possible transcriptional regulators including the NolR protein. Here we describe and characterize a new regulatory gene located in the non-symbiotic plasmid pRtrCIAT899c, that shows homology (46% identity) with the nolR gene located in the chromosome of CIAT 899. The mutation of this gene, named nrcR (nolR-like plasmid c Regulator), enhanced motility and exopolysaccharide production in comparison to the wild-type strain. Interestingly, the number and decoration of Nod Factors produced by this mutant were higher than those detected in the wild-type strain, especially under salinity stress. The nrcR mutant showed delayed nodulation and reduced competitiveness with P. vulgaris, and reduction in nodule number and shoot dry weight in both P. vulgaris and Leucaena leucocephala. Moreover, the mutant exhibited reduced capacity to induce the nodC gene in comparison to the wild-type CIAT 899. The finding of a new nod-gene regulator located in a non-symbiotic plasmid may reveal the existence of even more complex mechanisms of regulation of nodulation genes in R. tropici CIAT 899 that may be applicable to other rhizobial species.
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Affiliation(s)
- Pablo del Cerro
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla. Sevilla, Spain
| | | | | | - Antonio Gil-Serrano
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla. Sevilla, Spain
| | - Ramón A. Bellogín
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla. Sevilla, Spain
| | | | | | - Manuel Megías
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla. Sevilla, Spain
| | | | - Francisco Javier Ollero
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla. Sevilla, Spain
- * E-mail:
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