Changes in root morphological traits in soybean co-inoculated with Bradyrhizobium spp. and Azospirillum brasilense or treated with A. brasilense exudates

Rondina, Artur Berbel Lirio; Sanzovo, Alisson Wilson dos Santos; Guimarães, Gabriel Silva; Wendling, Jhonatan Rafael; Nogueira, Marco Antônio; Hungría, Mariangela

doi:10.1007/s00374-020-01453-0

Cited by 71 publications

(56 citation statements)

References 55 publications

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“…Recently, the impact of inoculation with A. brasilense has also been described by Rondina et al [ 37 ] who studied the morphology of soybean roots inoculated with different treatments and observed that inoculation with Bradyrhizobium spp. together with A. brasilense (Ab-V5 and Ab-V6) increased specific root length, root-hair length, and the number of root branches compared to the single inoculation with Bradyrhizobium spp.…”

Section: Resultsmentioning

confidence: 77%

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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Section: Resultsmentioning

confidence: 77%

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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“…In addition, the main published studies in Brazil were recently compiled by Santos et al ( 2021 ), and as an example, the studies of Ferri et al ( 2017 ) and Galindo et al ( 2018 ) indicated increases in grain yield due to the co-inoculation of 20.3 and 11.2%, respectively, compared to the inoculation exclusively with Bradyrhizobium . In the co-inoculation, although there may be a contribution from A. brasilense via biological nitrogen fixation, the benefits provided by strains Ab-V5 and Ab-V6 have been mainly attributed to the production of phytohormones, resulting in expressive increases in several root parameters (Fukami et al 2018b ; Rondina et al 2020 ). Root growth increases also favor the uptake of fertilizers (Galindo et al 2021 ).…”

Section: Discussionmentioning

confidence: 99%

Combining microorganisms in inoculants is agronomically important but industrially challenging: case study of a composite inoculant containing Bradyrhizobium and Azospirillum for the soybean crop

2021

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The increasing global perception of the importance of microbial inoculants to promote productivity and sustainability in agriculture prompts the adoption of bio-inputs by the farmers. The utilization of selected elite strains of nitrogen-fixing and other plant-growth promoting microorganisms in single inoculants creates a promising market for composite inoculants. However, combining microorganisms with different physiological and nutritional needs requires biotechnological development. We report the development of a composite inoculant containing Bradyrhizobium diazoefficiens and Azospirillum brasilense for the soybean crop. Evaluation of use of carbon sources indicates differences between the microbial species, with Bradyrhizobium growing better with mannitol and glycerol, and Azospirillum with malic acid and maleic acid, allowing the design of a formulation for co-culture. Species also differ in their growth rates, and the best performance of both microorganisms occurred when Azospirillum was inoculated on the third day of growth of Bradyrhizobium. The composite inoculant developed was evaluated in five field trials performed in Brazil, including areas without and with naturalized populations of Bradyrhizobium. The composite inoculant resulted in symbiotic performance comparable to the application of the two microorganisms separately. In comparison to the single inoculation with Bradyrhizobium, co-inoculation resulted in average increases of 14.7% in grain yield and 16.4% in total N accumulated in the grains. The performance of the composite inoculant was similar or greater than that of the non-inoculated control receiving a high dose of N-fertilizer, indicating the importance of the development and validation of inoculants carrying multiple beneficial microorganisms.

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“…Similarly, inoculation of rice endophyte Phomopsisliquidambari B3 signi cantly enhanced auxin, CK, and ethylene level in rice under varying N levels (Li et al, 2018). Additionally, Azospirillum brasilense has nitrite reductase activity and produces NO during root colonization which is involved in auxin signalling pathway to regulate the development of LR (Rondina et al, 2020).…”

Section: Auxin and Cytokininmentioning

confidence: 99%

Controlling The Root System Architecture In Rice: Impact of Genes, Phytohormones And Root Microbiota

Verma

Pandey

2021

Preprint

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BackgroundIn order to feed expanding population, new crop varieties were generated which significantly contribute to world food security. However, the growth of these improved plants varieties relied primarily on synthetic fertilizers, which negatively affect the environment as well as human health. Plants adapt to adverse environmental changes by adopting root systems through architectural changes at the root-type and tissue-specific changes and nutrient uptake efficiency. ScopePlants adapt and operate distinct pathways at various stages of development in order to optimally establish their root systems, such as change in the expression profile of genes, changes in phytohormone level and microbiome induced Root System Architecture (RSA) modification. Many scientific studies have been carried out to understand plant response to microbial colonization and how microbes involved in RSA improvement through phytohormone level and transcriptomic changes.ConclusionIn this review, we spotlight the impact of genes, phytohormones and root microbiota on RSA and provide specific, critical new insights that have been resulted from recent studies on rice root as a model. First, we discuss new insights into the genetic regulation of RSA. Next, hormonal regulation of root architecture and the impact of phytohormones in crown root and root branching is discussed. Finally, we discussed the impact of root microbiota in RSA modification and summarized the current knowledge about the biochemical and central molecular mechanisms involved.

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Changes in root morphological traits in soybean co-inoculated with Bradyrhizobium spp. and Azospirillum brasilense or treated with A. brasilense exudates

Cited by 71 publications

References 55 publications

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

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

Combining microorganisms in inoculants is agronomically important but industrially challenging: case study of a composite inoculant containing Bradyrhizobium and Azospirillum for the soybean crop

Controlling The Root System Architecture In Rice: Impact of Genes, Phytohormones And Root Microbiota

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