Diversity and Importance of Diazotrophic Bacteria to Agricultural Sustainability in the Tropics

Kaschuk, Glaciela; Hungría, Mariangela

doi:10.1007/978-3-319-55804-2_12

Cited by 18 publications

(9 citation statements)

References 129 publications

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“…), and symbiotic bacteria (e.g., Bradyrhizobium spp. ; Kaschuk and Hungria, 2017 ). In legumes, such as soybeans, symbiotic associations are established by the formation of root nodules, which are specialized root structures that harbor N 2 -fixing microbes.…”

Section: Example Success Storiesmentioning

confidence: 99%

Microbiome Research as an Effective Driver of Success Stories in Agrifood Systems – A Selection of Case Studies

et al. 2022

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Increasing knowledge of the microbiome has led to significant advancements in the agrifood system. Case studies based on microbiome applications have been reported worldwide and, in this review, we have selected 14 success stories that showcase the importance of microbiome research in advancing the agrifood system. The selected case studies describe products, methodologies, applications, tools, and processes that created an economic and societal impact. Additionally, they cover a broad range of fields within the agrifood chain: the management of diseases and putative pathogens; the use of microorganism as soil fertilizers and plant strengtheners; the investigation of the microbial dynamics occurring during food fermentation; the presence of microorganisms and/or genes associated with hazards for animal and human health (e.g., mycotoxins, spoilage agents, or pathogens) in feeds, foods, and their processing environments; applications to improve HACCP systems; and the identification of novel probiotics and prebiotics to improve the animal gut microbiome or to prevent chronic non-communicable diseases in humans (e.g., obesity complications). The microbiomes of soil, plants, and animals are pivotal for ensuring human and environmental health and this review highlights the impact that microbiome applications have with this regard.

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Section: Example Success Storiesmentioning

confidence: 99%

Microbiome Research as an Effective Driver of Success Stories in Agrifood Systems – A Selection of Case Studies

et al. 2022

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“…If legumes preferred specific strains, that is, the ones with higher rates of BNF, then inoculation would be overpowering. But, due to legume promiscuity and the higher competitiveness of native strains in relation to exotic strains, seedling inoculation would be advantageous because it places the rhizobia cells next to the developing rooting system at an early stage [63,69]. Studies of rhizobial diversity in nodules of black wattle planted in Australia and South Africa have identified strains belonging to species Bradyrhizobium japonicum, B. elkanii, Rhizobium leguminosarum, and R. tropici [70].…”

Section: Strengths Weaknesses Threats and Opportunitiesmentioning

confidence: 99%

“…Studies of rhizobial diversity in nodules of black wattle planted in Australia and South Africa have identified strains belonging to species Bradyrhizobium japonicum, B. elkanii, Rhizobium leguminosarum, and R. tropici [70]. But, the genus Bradyrhizobium is considered to be the dominant symbiotic rhizobia in black wattle nodules [17,40,69,[71][72][73]. To date, the genus Bradyrhizobium represented 97% of the strains isolated from black wattle growing in Australia [72], 100% of the strains isolated from nodules of commercial black wattle plantations in Brazil [17], and 100% of strains isolated from nodules growing in alien and native forests in Algeria [40].…”

Section: Strengths Weaknesses Threats and Opportunitiesmentioning

confidence: 99%

Rhizobial inoculation in black wattle plantation (Acacia mearnsii De Wild.) in production systems of southern Brazil

et al. 2019

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Black wattle (Acacia mearnsii De Wild.) is a tree legume native to southeast Australia, but present in all continents. Today it covers about 142,400 ha in Brazil, with plantations concentrated in the southern region of the country. Black wattle may form nodules and establish rhizobial symbiosis capable of fixing N 2 , but rhizobial inoculation is not done in commercial plantations. About 40 kg ha −1 of urea is applied during seedling transplantation. In this review, evidences by which rhizobial inoculation affects monoculture, mixed cultivation, and agroforestry black wattle production systems were searched in literature. Previous measurements in cultivated forests have indicated that biological nitrogen fixation in black wattle may provide up to 200 kg of N ha −1 year −1 to the soil. Therefore, rhizobia inoculation may bring several opportunities to improve black wattle production systems. Black wattle is not a very selective partner in the rhizobial symbiosis, but the genus Bradyrhizobium dominates the rhizobial diversity of black wattle nodules. Investigation on rhizobial diversity in soils where the crop is cultivated may represent an opportunity to find more effective rhizobia strains for inoculants. The successful history of biological nitrogen fixation in grain legumes must inspire the history of tree legumes. Microbiology applied to forestry must overcome challenges on the lack of trained professionals and the development of new application technologies.

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“…In this context, it is necessary to produce more food but also to search for production strategies resulting in minimum environmental impact. The inoculation of crops with plant growth-promoting bacteria (PGPB), especially those that can contribute to the reduction of chemical fertilizers usage, attends to these concepts of agricultural sustainability [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Compatibility of Azospirillum brasilense with Pesticides Used for Treatment of Maize Seeds

Santos

Rondina

Nogueira

et al. 2020

International Journal of Microbiology

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Seed treatment with chemical pesticides is commonly used as an initial plant protection procedure against pests and diseases. However, the use of such chemicals may impair the survival and performance of beneficial microorganisms introduced via inoculants, such as the plant growth-promoting bacterium Azospirillum brasilense. We assessed the compatibility between the most common pesticide used in Brazil for the treatment of maize seeds, composed of two fungicides, and one insecticide, with the commercial strains Ab-V5 and Ab-V6 of A. brasilense, and evaluated the impacts on initial plant development. The toxicity of the pesticide to A. brasilense was confirmed, with an increase in cell mortality after only 24 hours of exposure in vitro. Seed germination and seedling growth were not affected neither by the A. brasilense nor by the pesticide. However, under greenhouse conditions, the pesticide affected root volume and dry weight and root-hair incidence, but the toxicity was alleviated by the inoculation with A. brasilense for the root volume and root-hair incidence parameters. In maize seeds inoculated with A. brasilense, the pesticide negatively affected the number of branches, root-hair incidence, and root-hair length. Therefore, new inoculant formulations with cell protectors and the development of compatible pesticides should be searched to guarantee the benefits of inoculation with plant growth-promoting bacteria.

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Diversity and Importance of Diazotrophic Bacteria to Agricultural Sustainability in the Tropics

Cited by 18 publications

References 129 publications

Microbiome Research as an Effective Driver of Success Stories in Agrifood Systems – A Selection of Case Studies

Microbiome Research as an Effective Driver of Success Stories in Agrifood Systems – A Selection of Case Studies

Rhizobial inoculation in black wattle plantation (Acacia mearnsii De Wild.) in production systems of southern Brazil

Compatibility of Azospirillum brasilense with Pesticides Used for Treatment of Maize Seeds

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