Controle biológico da murcha do tomateiro causada por Ralstonia solanacearum e Fusarium oxysporum f. sp. lycopersici por rizobactérias

Rocha, Dediel Júnior A.; Moura, Andrea Bittencourt

doi:10.1590/s1982-56762013005000025

Cited by 19 publications

(13 citation statements)

References 22 publications

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“…Among the intracellular PGPR, the most studied are the rhizobium with leguminous plants symbiosis (Gray and Smith, 2005), and among the extracellular PGPR are the bacteria from the Bacillus and Pseudomonas genera (HarTEMAN et al, 2010;Rocha and Moura, 2013). There are, however, rhizobacteria that can stablish both in the interior and exterior of cells, belonging to both groups, that is, Burkholderia (Gray and Smith, 2005).…”

Section: Rhizobium As Plant Growth Promotersmentioning

confidence: 99%

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Potential use of rhizobium for vegetable crops growth promotion

Borges¹,

de²,

Muniz³

et al. 2019

Afr. J. Agric. Res.

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The system of vegetable crops production required large amounts of mineral fertilizers. One of the possible alternatives to assure the economic and environmental sustainability of this production system would be the use of promoting growth plant rhizobacteria (PGPR). However, care is needed to select a microorganism to be used in crops that are usually consumed raw, so human health is not at risk. It was important to search for PGPR, as rhizobium, that already were broadly used as inoculants for leguminous plants for several decades, without risks to human health. PGPR can promote growth and development of plants through direct and indirect mechanisms, by production and secretion of chemical substances in the rhizosphere. The direct mechanisms were involved with the uptake of nutrients by the plants (nitrogen, phosphorus and essential minerals) through phosphate solubilization, production of siderophores and growth regulators. The indirect mechanisms were involved with the decrease of inhibitory effects from various pathogenic agents related with biological pest control, thereby favoring plant growth. Nevertheless, due to its ability to promote beneficial effects to plants, effective bacterial colonization was extremely important. Some bacteria that colonized the rhizoplane may penetrate the plant roots and some strains may move to the aerial part, with decreased bacterial density, compared with colonizing populations in the rhizosphere or roots. It can be concluded that Rhizobia promotes plant growth using different mechanisms as biological nitrogen fixation and production of different plant growth regulators (e.g. auxins). Therefore, new studies with Rhizobia characterization and observation about its different mechanisms of promoting plant growth should be performed. Such information would be useful for the identification of plants with potential to increase agricultural production due to the benefits of using plant growth promoter's rhizobia.

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Section: Rhizobium As Plant Growth Promotersmentioning

confidence: 99%

“…Several species of Bacillus and Pseudomonas are used in biologic control, such as in tomato plants when inoculated with bacteria from these genera, which leads to a reduction of wither symptoms caused by Ralstonia solanacearum and Fusarium oxysporum f. sp. lycopersici (Rocha and Moura, 2013).…”

Section: Indirect Mechanismsmentioning

confidence: 99%

Potential use of rhizobium for vegetable crops growth promotion

Borges¹,

de²,

Muniz³

et al. 2019

Afr. J. Agric. Res.

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“…Studies on the suppression mechanism of the Bacillus agents indicated that the biocontrol effects of species primarily attribute to their production of various bioactive molecules [9]. Lipopeptide is one of the most important bioactive substances and exhibits excellent properties, such as broad-spectrum antibiotic activity, good stability, low toxicity, high biodegradability, and less prone to drug resistance [10].…”

Section: Introductionmentioning

confidence: 99%

Biocontrol of tomato bacterial wilt by a new strain Bacillus velezensis FJAT-46737 and its lipopeptides

Chen

Wang

Liu

et al. 2019

Preprint

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Background There is an urgent need to discover alternative antimicrobial agents to control bacterial wilt. The objectives of this study were to report a new lipopeptide-producding biocontrol strain FJAT-46737 and its lipopeptides, and to investigate their antagonistic effects.Results Based on the whole genome sequence analysis, the new strain FJAT-46737 was finally identified as Bacillus velezensis and seven gene clusters that responsible for synthesis of bioactive secondary metabolite in the FJAT-46737 were predicted. Antimicrobial results demonstrated that FJAT-46737 exhibited broad-spectrum antimicrobial activities in vitro against bacteria and fungi. The pot experiments showed that the tomato bacterial wilt control efficiencies of the whole cultures, the 2-fold diluted supernatants and the crude lipopeptide of FJAT-46737 were 66.2%, 82.0%, and 96.2%, respectively. The above results suggested that one of the antagonistic mechanisms of FJAT-46737 was secretion of lipopeptides that consisted of iturins, fengycins and surfactins. The crude lipopeptides had significant antagonistic activities on several pathogen in a dosage-dependent manner, and the fengycins confirmed to play a major role in antibacterial abilities in vitro of the lipopeptides against Ralstonia solanacearum . Furthermore, it was found that the rich organic nitrogen sources (expecially yeast extracts) in the media were benificial for FJAT-46737 to produce fengycin and surfactin. The secretion of these two lipopeptides were also adjusted by the culture temperature: the content of the fengycins decreased by 96.6% and that of the surfactins ascended by 59.9% from 20 o C to 40 o C. And 20 o C~25 o C is the suitable temperature for FJAT-46737 to produce lipopeptide.Conclusions The B. velezensis strain FJAT-46737 and its lipopeptides would used as new sources of potential biocontrol agents against plant pathogens, especially the bacterial wilt pathogen R. solanacearum .

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“…Studies on the biocontrol mechanisms of Bacillus agents indicated that the biocontrol effects of certain species are primarily associated with their production of various bioactive molecules [9].…”

mentioning

confidence: 99%

Biocontrol of tomato bacterial wilt by the new strain Bacillus velezensis FJAT-46737 and its lipopeptides

Chen

Wang²,

Liu

et al. 2020

Preprint

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Background: There is an urgent need to discover alternative Bacillus biocontrol agents to control bacterial wilt. This study reports on a new lipopeptide-producing biocontrol strain FJAT-46737 and explores its lipopeptidic compounds, and this study investigates the antagonistic effects of these compounds.Results: Based on a whole genome sequence analysis, the new strain FJAT-46737 was identified as Bacillus velezensis, and seven gene clusters responsible for the synthesis of bioactive secondary metabolites in FJAT-46737 were predicted. The antimicrobial results demonstrated that FJAT-46737 exhibited broad-spectrum antimicrobial activities in vitro against three bacteria and three fungi. Pot experiments showed that the control efficiencies for tomato bacterial wilt of the whole cultures, the 2-fold diluted supernatants and the crude lipopeptide of FJAT-46737 were 66.2%, 82.0%, and 96.2%, respectively. The above results suggested that one of the antagonistic mechanisms of FJAT-46737 was the secretion of lipopeptides consisting of iturins, fengycins and surfactins. The crude lipopeptides had significant antagonistic activities against several pathogens (including Ralstonia solanacearum, Escherichia coli and Fusarium oxysporum) and fengycins were the major antibacterial components of the lipopeptides against R. solanacearum in vitro. Furthermore, the rich organic nitrogen sources (especially yeast extracts) in the media promoted the production of fengycin and surfactin by FJAT-46737. The secretion of these two lipopeptides was related to temperature fluctuations, with the fengycin content decreasing by 96.6% and the surfactins content increasing by 59.9% from 20 oC to 40 oC. The optimal temperature for lipopeptide production by FJAT-46737 varied between 20 oC and 25oC. Conclusions: The B. velezensis strain FJAT-46737 and its secreted lipopeptides could be used as new sources of potential biocontrol agents against several plant pathogens, and especially the bacterial wilt pathogen R. solanacearum.

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Controle biológico da murcha do tomateiro causada por Ralstonia solanacearum e Fusarium oxysporum f. sp. lycopersici por rizobactérias

Cited by 19 publications

References 22 publications

Potential use of rhizobium for vegetable crops growth promotion

Potential use of rhizobium for vegetable crops growth promotion

Biocontrol of tomato bacterial wilt by a new strain Bacillus velezensis FJAT-46737 and its lipopeptides

Biocontrol of tomato bacterial wilt by the new strain Bacillus velezensis FJAT-46737 and its lipopeptides

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