Plant-Associated Biofilms

Molina, María Antonia; Ramos, Juan-Luis; Espinosa‐Urgel, Manuel

doi:10.1023/b:resb.0000040458.35960.25

Cited by 31 publications

(14 citation statements)

References 55 publications

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“…However, the effects differ between strains because of diverse ecological habitats and genetic backgrounds. Additionally, GacS/ GacA and siderophores both have cross talk with many other pathways, such as quorum sensing (55,56), biofilm formation (57)(58)(59), and stress response (19,60,61). Further studies on the relationships among GacS/GacA, siderophores, and other factors in diverse strains will provide more insights into the strategies through which bacteria adapt to a changing environment.…”

Section: Discussionmentioning

confidence: 99%

The Two-Component Regulators GacS and GacA Positively Regulate a Nonfluorescent Siderophore through the Gac/Rsm Signaling Cascade in High-Siderophore-Yielding Pseudomonas sp. Strain HYS

Chen

Jiang

et al. 2014

J Bacteriol

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bSiderophores, which are produced to overcome iron deficiency, are believed to be closely related to the adaptability of bacteria. The high-siderophore-yielding Pseudomonas sp. strain HYS simultaneously secretes the fluorescent siderophore pyoverdine and another nonfluorescent siderophore that is a major contributor to the high siderophore yield. Transposon mutagenesis revealed siderophore-related genes, including the two-component regulators GacS/GacA and a special cluster containing four open reading frames (the nfs cluster). Deletion mutations of these genes abolished nonfluorescent-siderophore production, and expression of the nfs cluster depended on gacA, indicating that gacS-gacA may control the nonfluorescent siderophore through regulation of the nfs cluster. Furthermore, regulation of the nonfluorescent siderophore by GacS/GacA involved the Gac/Rsm pathway. In contrast, inactivation of GacS/GacA led to upregulation of the fluorescent pyoverdine. The two siderophores were secreted under different iron conditions, probably because of differential effects of GacS/GacA. The global GacS/GacA regulatory system may control iron uptake by modulating siderophore production and may enable bacteria to adapt to changing iron environments.

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Section: Discussionmentioning

confidence: 99%

The Two-Component Regulators GacS and GacA Positively Regulate a Nonfluorescent Siderophore through the Gac/Rsm Signaling Cascade in High-Siderophore-Yielding Pseudomonas sp. Strain HYS

Chen

Jiang

et al. 2014

J Bacteriol

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“…Since E is a monotone function, we deduce that {M ε } is also convergent almost everywhere. Also, (21), (27) Hence, for arbitrary δ > 0, we have…”

Section: Existencementioning

confidence: 99%

“…the directed movement of cells in response to chemical gradients. Other authors have pointed out that this might in particular be important for plant associated biofilms and the colonization of biotic surfaces, provided the environmental conditions are suitable [21]. However, the experimental evidence for the role of chemotaxis in biofilm formation seems meager, and several experimental studies remained inconclusive [17].…”

mentioning

confidence: 99%

Analysis of a degenerate biofilm model with a nutrient taxis term

Eberl

Efendiev

Wrzosek

et al. 2014

Discrete &Amp; Continuous Dynamical Systems - A

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We introduce and analyze a prototype model for chemotactic effects in biofilm formation. The model is a system of quasilinear parabolic equations into which two thresholds are built in. One occurs at zero cell density level, the second one is related to the maximal density which the cells cannot exceed. Accordingly, both diffusion and taxis terms have degenerate or singular parts. This model extends a previously introduced degenerate biofilm model by combining it with a chemotaxis equation. We give conditions for existence and uniqueness of weak solutions and illustrate the model behavior in numerical simulations.2010 Mathematics Subject Classification. Primary: 35K55, 35K65, 34B15; Secondary: 92C17, 92D25.

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“…The distinctiveness of the action of beneficial biofilms developed in vitro has already shown potential for bringing numerous favorable effects to microbial biotechnological applications (Seneviratne et al 2007). Furthermore, since biofilm formation is claimed to be intimately related to the mechanisms that determine colonization (Molina et al 2003), we studied the potential of selected components in influencing the colonization of B-30488 r in rhizosphere and in influencing chickpea growth in Cr(VI) stress environment. In the greenhouse experiment run for 30 days, Cr at 136 mg/kg significantly (P \ 0.05) decreased the overall plant growth parameters as compared to the control.…”

mentioning

confidence: 99%

Paenibacillus lentimorbus enhances growth of chickpea (Cicer arietinum L.) in chromium-amended soil

Khan

Mishra

Chauhan

et al. 2011

Antonie van Leeuwenhoek

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Chromium (Cr), with its great economic importance in industrial use, is a major metal pollutant of the environment. It affects soil microbial activity and soil fertility, resulting in losses in yield of plants.Paenibacillus lentimorbus B-30488 r (B-30488 r ) tolerated 200 lg ml -1 of Cr under in vitro conditions and produced the plant growth promoting substance indole acetic acid in the presence of Cr. Our in vitro study indicates enhancement in B-30488 r biofilm formation by sodium alginate (SA) and calcium chloride (CaCl 2 ) both in absence and presence of supplemented Cr(VI) as compared to unsupplemented control. The plant growth promoting effects caused by the B-30488 r biofilm in rhizosphere of chickpea under Cr(VI) stress suggests a phytoprotective role of B-30488 r biofilm. Our study reflects the multifarious role of strain B-30488 r and presents it as a potent plant growth promoting and bioremediation agent useful in Cr-contaminated rhizosphere soil, whereby the SA and CaCl 2 induced B-30488 r biofilm on plant root acts as a shield in preventing the direct access of toxic Cr to plant tissues, thus reducing its uptake in plants.

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Plant-Associated Biofilms

Cited by 31 publications

References 55 publications

The Two-Component Regulators GacS and GacA Positively Regulate a Nonfluorescent Siderophore through the Gac/Rsm Signaling Cascade in High-Siderophore-Yielding Pseudomonas sp. Strain HYS

The Two-Component Regulators GacS and GacA Positively Regulate a Nonfluorescent Siderophore through the Gac/Rsm Signaling Cascade in High-Siderophore-Yielding Pseudomonas sp. Strain HYS

Analysis of a degenerate biofilm model with a nutrient taxis term

Paenibacillus lentimorbus enhances growth of chickpea (Cicer arietinum L.) in chromium-amended soil

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