Ecological Significance of Siderophores in Soil

Bossier, Peter; Höfte, Monica; Verstraete, Willy

doi:10.1007/978-1-4684-5409-3_9

Cited by 73 publications

(25 citation statements)

References 72 publications

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“…This suggests that, in some environments where the two species are in similar (50). Siderophores are important for microbial growth in the soil and have been isolated directly from soil in several studies (4,32). In addition, P. aeruginosa siderophores have been isolated from the sputa of CF patients (16).…”

Section: Discussionmentioning

confidence: 99%

Burkholderia spp. Alter Pseudomonas aeruginosa Physiology through Iron Sequestration

Weaver

Kolter

2004

J Bacteriol

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Pseudomonas aeruginosa and members of the Burkholderia cepacia complex often coexist in both the soil and the lungs of cystic fibrosis patients. To gain an understanding of how these different species affect each other's physiology when coexisting, we performed a screen to identify P. aeruginosa genes that are induced in the presence of Burkholderia. A random gene fusion library was constructed in P. aeruginosa PA14 by using a transposon containing a promoterless lacZ gene. Fusion strains were screened for their ability to be induced in the presence of Burkholderia strains in a cross-streak assay. Three fusion strains were induced specifically by Burkholderia species; all three had transposon insertions in genes known to be iron regulated. One of these fusion strains, containing a transposon insertion in gene PA4467, was used to characterize the inducing activity from Burkholderia. Biochemical and genetic evidence demonstrate that ornibactin, a siderophore produced by nearly all B. cepacia strains, can induce P. aeruginosa PA4467. Significantly, PA4467 is induced early in coculture with an ornibactin-producing but not an ornibactin-deficient B. cepacia strain, indicating that ornibactin can be produced by B. cepacia and detected by P. aeruginosa when the two species coexist.

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Section: Discussionmentioning

confidence: 99%

Burkholderia spp. Alter Pseudomonas aeruginosa Physiology through Iron Sequestration

Weaver

Kolter

2004

J Bacteriol

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“…Successful bacterial pathogens are able to compete successfully for iron in the highly iron-stressed environment of the tissues and body fluids of the host (147). The ecological significance of siderophores in soils as important tools for iron acquisition by microorganisms and plants and their involvement in suppression of plant root pathogens have been established (12,88).…”

Section: Competition For Chemicals or Available Energymentioning

confidence: 99%

“…Siderophore production by fluorescent pseudomonads in soil is known to be influenced by a great variety of factors (12,88). Therefore, detection of in vitro production of siderophores does not necessarily mean that they are produced in significant amounts in vivo in order to have a significant biological control effect.…”

Section: Competition For Chemicals or Available Energymentioning

confidence: 99%

Probiotic Bacteria as Biological Control Agents in Aquaculture

Verschuere

Rombaut

Sorgeloos

et al. 2000

Microbiol Mol Biol Rev

1,823

1,325

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SUMMARY There is an urgent need in aquaculture to develop microbial control strategies, since disease outbreaks are recognized as important constraints to aquaculture production and trade and since the development of antibiotic resistance has become a matter of growing concern. One of the alternatives to antimicrobials in disease control could be the use of probiotic bacteria as microbial control agents. This review describes the state of the art of probiotic research in the culture of fish, crustaceans, mollusks, and live food, with an evaluation of the results obtained so far. A new definition of probiotics, also applicable to aquatic environments, is proposed, and a detailed description is given of their possible modes of action, i.e., production of compounds that are inhibitory toward pathogens, competition with harmful microorganisms for nutrients and energy, competition with deleterious species for adhesion sites, enhancement of the immune response of the animal, improvement of water quality, and interaction with phytoplankton. A rationale is proposed for the multistep and multidisciplinary process required for the development of effective and safe probiotics for commercial application in aquaculture. Finally, directions for further research are discussed.

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“…Despite the high diversity among siderophores, with more than 500 so far characterized (Boukhalfa and Crumbliss 2002), all of them form sixcoordinate octahedral complex with Fe(III) (Guerinot 1994). They are classified according to the functional groups acting as ligands: catecholates, hydroxamates, hydroxypyridonates, hydroxy-or amino-carboxylates (Bossier et al 1988;Winkelmann 1991Winkelmann , 2002Winkelmann , 2007, some siderophores include mixed functional compounds (Mossialos and Amoutzias 2007). The affinity for iron differ upon the type of siderophore and with K values ranging between 10 23 -10 25 for carboxylates, 10 29 -10 32 for trihydroxamates, and up to 10 52 for the catecholate siderophore, enterobactin (Drechsel and Jung 1998).…”

Section: Summary Of Our Knowledgementioning

confidence: 99%

Iron dynamics in the rhizosphere as a case study for analyzing interactions between soils, plants and microbes

et al. 2009

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International audienceIron is an essential element for plants and microbes. However, in most cultivated soils, the concentration of iron available for these living organisms is very low because its solubility is controlled by stable hydroxides, oxyhydroxides and oxides. In the rhizosphere, there is a high demand of iron because of the iron uptake by plants, and microorganisms which density and activity are promoted by the release of root exudates. Plants and microbes have evolved active strategies of iron uptake. Iron incorporation by these organisms lead to complex interactions ranging from competition to mutualism. These complex interactions are under the control of physico-chemical properties of the soils in which they occur, and reciprocally iron uptake strategies of plants and microbes impact these soil properties. These iron-mediated nteractions between soils, plants and microbes impact the plant growth and health and their analysis, together with that of the resulting iron dynamics, is of a major agronomic interest. Analysis of the complex interactions soils, plants and microbes represent also a unique opportunity to progress in our knowledge of the rhizosphere ecology. This progression requires merging complementary expertises and study strategies in soil science, plant biology and microbiology. This review provides information on (i) iron status in soil and rhizosphere, iron uptake by plants and microbes, and on (ii) the corresponding study strategies. Finally, illustrations of how integration of these approaches allows gaining knowledge in the complex interactions occurring in the rhizosphere are given

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Ecological Significance of Siderophores in Soil

Cited by 73 publications

References 72 publications

Burkholderia spp. Alter Pseudomonas aeruginosa Physiology through Iron Sequestration

Burkholderia spp. Alter Pseudomonas aeruginosa Physiology through Iron Sequestration

Probiotic Bacteria as Biological Control Agents in Aquaculture

Iron dynamics in the rhizosphere as a case study for analyzing interactions between soils, plants and microbes

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