Oryza sativa rice plants contain molecules that activate different quorum-sensing N-acyl homoserine lactone biosensors and are sensitive to the specific AiiA lactonase

Degrassi, Giuliano; Devescovi, Giulia; Solis, Renando; Steindler, Laura; Venturi, Vittorio

doi:10.1111/j.1574-6968.2006.00624.x

Cited by 50 publications

(26 citation statements)

References 40 publications

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“…Both plants and algae have been shown to produce and secrete compounds that mimic quorum sensing components and inXuence bacterial gene expression Degrassi et al 2007). In addition, plants seem to be able to detect various AHLs at quite low concentrations (Mathesius et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Response of Arabidopsis thaliana to N-hexanoyl-dl-homoserine-lactone, a bacterial quorum sensing molecule produced in the rhizosphere

Rad

Klein

Dobrev

et al. 2008

Planta

205

177

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The bacterial quorum sensing signals N-acyl-L: -homoserine lactones enable bacterial cells to regulate gene expression depending on population density, in order to undertake collective actions such as the infection of host cells. Only little is known about the molecular ways of plants reacting to these bacterial signals. In this study we show that the contact of Arabidopsis thaliana roots with N-hexanoyl-DL: -homoserine-lactone (C6-HSL) resulted in distinct transcriptional changes in roots and shoots, respectively. Interestingly, unlike most other bacterial signals, C6-HSL influenced only a few defense-related transcripts. Instead, several genes associated with cell growth as well as genes regulated by growth hormones showed changes in their expression after C6-HSL treatment. C6-HSL did not induce plant systemic resistance against Pseudomonas syringae. The inoculation of roots with different types of AHLs led predominantly for short chain N-butyryl-DL: -homoserine lactone and C6-HSL to root elongation. Determination of plant hormone concentrations in root and shoot tissues supported alterations of auxin to cytokinin ratio. Finally, we provide evidence that Arabidopsis takes up bacterial C6-HSL and allows systemic distribution throughout the plant. In sum, the bacterial quorum sensing signal C6-HSL does induce transcriptional changes in Arabidopsis and may contribute to tuning plant growth to the microbial composition of the rhizosphere.

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Section: Discussionmentioning

confidence: 99%

Response of Arabidopsis thaliana to N-hexanoyl-dl-homoserine-lactone, a bacterial quorum sensing molecule produced in the rhizosphere

Rad

Klein

Dobrev

et al. 2008

Planta

205

177

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show abstract

“…The interference with bacterial signaling by excreting QS-mimic orinhibitory substances would have the advantage to disturb the coordination of the bacterial attackespecially in the case of pathogens. It has been indeed found in several plants, that QS-inhibitors are produced (Bauer and Mathesius 2004;Degrassi et al 2007;Hentzer et al 2002;Rasmussen et al 2005;Teplitski et al 2000). On the other hand, it was demonstrated that mostly leguminous plants are able to degrade bacterial N-acyl homoserine lactone (AHL) autoinducers by excreting lactonases or AHL-hydrolases (d' AngeloPicard et al 2005;Delalande et al 2005).…”

Section: Exudation Of Antimicrobialsmentioning

confidence: 99%

Plant-driven selection of microbes

Hartmann¹,

Schmid²,

Tuinen³

et al. 2008

Plant Soil

920

483

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The rhizodeposition of plants dramatically influence the surrounding soil and its microflora. Root exudates have pronounced selective and promoting effects on specific microbial populations which are able to respond with chemotaxis and fast growth responses, such that only a rather small subset of the whole soil microbial diversity is finally colonizing roots successfully. The exudates carbon compounds provide readily available nutrient and energy sources for heterotrophic organisms but also contribute e.g. complexing agents, such as carboxylates, phenols or siderophores for the mobilization and acquisition of rather insoluble minerals. Root exudation can also quite dramatically alter the pH-and redox-milieu in the rhizosphere. In addition, not only specific stimulatory compounds, but also antimicrobials have considerable discriminatory effect on the rhizosphere microflora. In the "biased rhizosphere" concept, specific root associated microbial populations are favored based on modification of the root exudation profile. Rhizosphere microbes may exert specific plant growth promoting or biocontrol effects, which could be of great advantage for the plant host. Since most of the plant roots have symbiotic fungi, either arbuscular or ectomycorrhizal fungi, the impact of plants towards the rhizosphere extends also to the mycorrhizosphere. The selective effect of the roots towards the selection of microbes also extends towards the root associated and symbiotic fungi. While microbes are known to colonize plant roots endophytically, also mycorrhiza are now known to harbor closely associated bacterial populations even within their hyphae.The general part of the manuscript is followed by the more detailed presentation of specific examples for the selection and interaction of roots and microbes, such as in the rhizosphere of strawberry, potato and oilseed rape, where the soil-borne plant pathogen Verticillium dahliae can cause high yield losses; the potential of biocontrol by specific constituents of the rhizosphere microbial community is demonstrated. Furthermore, plant cultivar specificity of microbial communities is described in different Plant Soil (2009) 321:235-257 potato lines including the case of transgenic lines. Finally, also the specific selective effect of different Medicago species on the selection of several arbuscular mycorrhizal taxa is presented.

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“…Several plant species secrete AHL mimics which can either stimulate or inhibit bacterial AHL QS systems (Bauer and Mathesius, 2004). Detection of AHL mimics have been reported in secretions of pea, rice, soyabean, tomato, crown vetch, M. truncatula, and from the unicellular algae Chlamydomonas reinhardtii (Degrassi et al, 2007;Gao et al, 2003;Teplitski et al, 2004;Teplitski et al, 2000). No evidence is currently available that these AHL mimics are interacting with QS systems in vivo; experiments in tomato with A. tumefaciens, in fact, have evidenced that these mimics cannot act as AHL agonists (Khan and Farrand, 2008).…”

Section: Plant Interkingdom Signaling With Bacterial Ahl Quorum Sensingmentioning

confidence: 99%

Future research trends in the major chemical language of bacteria

Venturi

Subramoni

2009

HFSP Journal

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Oryza sativa rice plants contain molecules that activate different quorum-sensing N-acyl homoserine lactone biosensors and are sensitive to the specific AiiA lactonase

Cited by 50 publications

References 40 publications

Response of Arabidopsis thaliana to N-hexanoyl-dl-homoserine-lactone, a bacterial quorum sensing molecule produced in the rhizosphere

Response of Arabidopsis thaliana to N-hexanoyl-dl-homoserine-lactone, a bacterial quorum sensing molecule produced in the rhizosphere

Plant-driven selection of microbes

Future research trends in the major chemical language of bacteria

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