Microbial siderophores: a mini review

Saha, Ratul; Saha, Nayan Ranjan; Donofrio, Robert; Bestervelt, Lorelle L.

doi:10.1002/jobm.201100552

Cited by 349 publications

(255 citation statements)

References 214 publications

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“…One of the best-studied aspects of the interaction between plant and rhizosphere microorganisms is their ability to induce positive effects on plant growth by enhancing the uptake of nutrients [27]. In general, the bacterial strain assayed in the present study did not prove to affect the root uptake of mineral macro-elements (N, P, K).…”

Section: Discussioncontrasting

confidence: 48%

“…In general, the bacterial strain assayed in the present study did not prove to affect the root uptake of mineral macro-elements (N, P, K). On the contrary, a considerable improvement in iron (Fe) content was recorded in both rootstocks treated with A. brasilense Sp245, confirming the ability of rhizobacteria to increase the mobility of Fe by releasing chelating compounds known as siderophores [27]. Iron is a critical element for plant development, since it is involved in many biochemical processes and, often, due to the low solubility of the natural Fe sources in soil, plants suffer from Fe deficiency, especially when grown on calcareous soils.…”

Section: Discussionmentioning

confidence: 85%

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Effectiveness of Azospirillum brasilense Sp245 on young plants of Vitis vinifera L.

et al. 2017

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Information about the influence of the plant growth promoting rhizobacteria Azospirillum brasilense Sp245 on the development of grapevine plants could be promoted to enhance sustainable agricultural practices for globally important fruit crops such as grapes. Thus, this study was initiated to evaluate the potential influence of A. brasilense Sp245 on two separate experimental trials, A) potted young grape plants: cv. 'Colorino' grafted onto two rootstocks 420A and 157/11 which received a fixed volume of inoculum at different times of vegetative cycle; B) hardwood cuttings from rootstock mother-plants of 420A and 775P inoculated during the phase of hydration, before bench-grafting in a specialized nursery. Overall, our results revealed that A. brasilense Sp245 has considerable potential to enhance the root apparatus and vegetative development in grapevines. Potted plants inoculated with A. brasilense Sp245 showed an improved development. Repeated supply was revealed to be more effective, inducing a greater accumulation of dry mass. Interesting findings were obtained in nursery experiments resulting from a considerable enhancement of the final quality of roots. The stimulating effect of A. brasilense Sp245 on vegetative development of rootstocks and vines may indeed improve sustainability in viticulture, through the promotion of healthy growth and a reduced dependence on fertilizers and other chemicals

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Section: Discussioncontrasting

confidence: 48%

Section: Discussionmentioning

confidence: 85%

Effectiveness of Azospirillum brasilense Sp245 on young plants of Vitis vinifera L.

et al. 2017

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“…Aerobactin is expressed during the GP (Karunker et al, 2013): as oxidizing conditions prevail in the periplasm (Depuydt et al, 2009), soluble ferrous iron (the redox state of iron in the cytoplasm; Saha et al, 2012) from the prey may become oxidized and thus unavailable to the predator. Aerobactin could then sequester ferric ion and deliver it (Saha et al, 2012) to the growing predatory cell. Although B. bacteriovorus HD100 lacks an identified aerobactin receptor, it possesses six TonB-dependent receptor genes, two of which are putative siderophore receptors expressed during GP.…”

Section: Discussionmentioning

confidence: 99%

In and out: an analysis of epibiotic vs periplasmic bacterial predators

et al. 2013

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Bdellovibrio and like organisms (BALO) are obligate predators of Gram-negative bacteria, belonging to the a-and d-proteobacteria. BALO prey using either a periplasmic or an epibiotic predatory strategy, but the genetic background underlying these phenotypes is not known. Here we compare the epibiotic Bdellovibrio exovorus and Micavibrio aeruginosavorus to the periplasmic B. bacteriovorus and Bacteriovorax marinus. Electron microscopy showed that M. aeruginosavorus, but not B. exovorus, can attach to prey cells in a non-polar manner through its longitudinal side. Both these predators were resistant to a surprisingly high number of antibiotic compounds, possibly via 26 and 19 antibiotic-resistance genes, respectively, most of them encoding efflux pumps. Comparative genomic analysis of all the BALOs revealed that epibiotic predators have a much smaller genome (ca. 2.5 Mbp) than the periplasmic predators (ca. 3.5 Mbp). Additionally, periplasmic predators have, on average, 888 more proteins, at least 60% more peptidases, and one more rRNA operon. Fifteen and 219 protein families were specific to the epibiotic and the periplasmic predators, respectively, the latter clearly forming the core of the periplasmic 'predatome', which is upregulated during the growth phase. Metabolic deficiencies of epibiotic genomes include the synthesis of inosine, riboflavin, vitamin B6 and the siderophore aerobactin. The phylogeny of the epibiotic predators suggests that they evolved by convergent evolution, with M. aeruginosavorus originating from a non-predatory ancestor while B. exovorus evolved from periplasmic predators by gene loss.

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“…These antioxidants are likely to compete with acteoside in several reactions, resulting in preservation of more acteoside in solution. The acteoside protective effects may also be enhanced by uptake of transition metals for growth from the medium by the fungi, or chelation by siderophores (Saha et al, 2012). Intensive respiration leading to relative depletion of oxygen while the fungi are growing can also enhance this effect.…”

Section: 4mentioning

confidence: 99%

Filamentous fungi from Plantago lanceolata L. leaves: Contribution to the pattern and stability of bioactive metabolites

et al. 2013

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The aim of this study was to test contribution of plant-associated microorganism (PAMs) to metabolite stability/instability in a medicinal plant matrix.Therefore, PAM strains were isolated and identified based on relevant DNA sequences from Plantago lanceolata leaves. Sterile water extracts of P. lanceolata were incubated with the isolated strains and antioxidants (ascorbic acid (AA), and EDTA) for 15 days, and changes in the concentrations of chief bioactive constituents (aucubin, catalpol, acteoside (= verbascoside)) were quantified by capillary electrophoresis. Phenolic breakdown-products were identified by GC-MS.PAMs were identified from the genera Epicoccum, Bipolaris, Cladosporium, Leptosphaerulina, Aspergillus, Eurotium and Penicillium (pathongens, endophytes, and other species). Some fungi caused significant decomposition of the chief constituents (p < 0.001). Surprisingly, some strains inhibited breakdown of acteoside (p < 0.001). Meanwhile, concentration of several phenolic acids increased in fungi-infested extracts (p<0.001). Gentisic acid, 4-hydroxyphenyl acetic acid, 4-hydroxybenzoic acid and hydroxytyrosol were only present when the extract was infested with a PAM. The products are powerful antioxidants and chelators. Concentrations of phenolic acids influenced acteoside stability significantly (p < 0.01), as shown by basic data-mining techniques. AA and EDTA also significantly inhibited acteoside breakdown in sterile model solutions (p < 0.05).Our results suggest, that the phenolic acid mixture (produced during the fungal proliferation) protected acteoside from breakdown, possibly via its antioxidant activity and metal complexing ability.It was shown, that PAMs can increase or decrease the stability of chief metabolites in herbal matrices, and can significantly alter the chemical pattern of the plant matrix. 2 KeywordsPlantago lanceolata L., ribwort plantain, endophyte, plant-associated microorganism, metabolite stability, phenolic acids, acteoside 3

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Microbial siderophores: a mini review

Cited by 349 publications

References 214 publications

Effectiveness of Azospirillum brasilense Sp245 on young plants of Vitis vinifera L.

Effectiveness of Azospirillum brasilense Sp245 on young plants of Vitis vinifera L.

In and out: an analysis of epibiotic vs periplasmic bacterial predators

Filamentous fungi from Plantago lanceolata L. leaves: Contribution to the pattern and stability of bioactive metabolites

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