Identification of an
            <i>rsh</i>
            Gene from a
            <i>Novosphingobium</i>
            sp. Necessary for Quorum-Sensing Signal Accumulation

Gan, Han Ming; Buckley, Lawrence J.; Szegedi, E.; Hudson, André O.; Savka, Michael A.

doi:10.1128/jb.01692-08

Cited by 27 publications

(38 citation statements)

References 60 publications

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“…Neighboring nonpathogenic bacteria that reside within the same tumor may provide a secondary source of AHL to modulate the virulence of plant pathogens. For example, coinhabitants of the genus Novosphingobium utilize a ppGpp-dependent pathway to produce AHL, which affects neighboring plant pathogens (69).…”

Section: Plant Pathogens and Symbiontsmentioning

confidence: 99%

ppGpp Conjures Bacterial Virulence

Dalebroux

Svensson

Gaynor

et al. 2010

Microbiol Mol Biol Rev

333

364

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SUMMARY Like for all microbes, the goal of every pathogen is to survive and replicate. However, to overcome the formidable defenses of their hosts, pathogens are also endowed with traits commonly associated with virulence, such as surface attachment, cell or tissue invasion, and transmission. Numerous pathogens couple their specific virulence pathways with more general adaptations, like stress resistance, by integrating dedicated regulators with global signaling networks. In particular, many of nature's most dreaded bacteria rely on nucleotide alarmones to cue metabolic disturbances and coordinate survival and virulence programs. Here we discuss how components of the stringent response contribute to the virulence of a wide variety of pathogenic bacteria.

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Section: Plant Pathogens and Symbiontsmentioning

confidence: 99%

ppGpp Conjures Bacterial Virulence

Dalebroux

Svensson

Gaynor

et al. 2010

Microbiol Mol Biol Rev

333

364

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“…There are many techniques to clean up PAH-contaminated soils, but they are very expensive and disturb the environment if they need a transfer of pollutants to another site for treatment (Gan et al, 2009). Interestingly, the emerging, low-cost, and environment-friendly green technology phytoremediation is beginning to be used for the decontamination of soils, waters, and sediments (Vangronsveld et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

The halophytic model plant Thellungiella salsuginea exhibited increased tolerance to phenanthrene-induced stress in comparison with the glycophitic one Arabidopsis thaliana: Application for phytoremediation

Shiri

Rabhi

Abdelly

et al. 2015

Ecological Engineering

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Polycyclic aromatic hydrocarbons constitute a large family of organic environmental pollutants. Hence, a particular attention has been attributed to all approaches involved in the reduction of their contamination in water and natural ecosystems. Plant tolerance, absorption, accumulation, and likely biodegradation of these pollutants, known as phytoremediation, have emerged as an efficient technique to remediate environments contaminated with polycyclic aromatic hydrocarbons. The present work was aimed to compare the tolerance to phenanthrene (a polycyclic aromatic hydrocarbon) in the two model plants: Arabidopsis thaliana (glycophyte) and Thellungiella salsuginea (halophyte). Our study showed that the development of these two species was reduced under phenanthrene stress, the effect being more pronounced in Arabidopsis thaliana than in Thellungiella salsuginea. In parallel, results from the intrinsic quantum yield of photosystem II and chlorophyll concentrations were concomitant with those of growth and phenotypic changes, and confirmed the higher tolerance of Thellungiella salsuginea compared to that of Arabidopsis thaliana. The intrinsic quantum yield of photosystem II was drastically decreased in the glycophyte, which indicates a marked disturbance in photosystem II performance. This induced a severe oxidative stress as shown by the utilization of specific reactive oxygen species probes. In parallel, the activities of glutathione reductase, gaiacol peroxidase, and superoxide dismutase were increased by 95, 73, and 36%, respectively, which indicates a marked phenanthrene-induced oxidative stress. In Thellungiella salsuginea, photosystem II performance was not significantly affected. This species showed less accumulated reactive oxygen species than Arabidopsis thaliana. Its enzymatic antioxidant system showed few changes as superoxide dismutase was the only enzyme whose activity was enhanced (+34%). A 3 much higher capacity of recovery was also noticed in this halophyte as compared to the glycophyte. Indeed, it seems that Thellungiella salsuginea accumulated phenanthrene in stomata, which suggests its possible volatilization. All these data, taken together, add new insight to the mechanisms involved in halophytic plant tolerance to abiotic stresses and their potential use in phytoremediation. Graphical abstract Phenanthrene Glycophytic

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“…Novosphingobium sp. strain Rr 2-17 was shown to produce N-acyl homoserine lactones (AHLs) that can activate the TraR receptor protein implicated in the quorum-sensing regulation of pTi replication and conjugation in plant tumors and thus potentially influence virulence in Agrobacterium tumefaciens and Agrobacterium vitis, the causal agent of crown gall disease for dicotyledonous and grapevine plants, respectively (3,6). In this study, the genome sequence of Novosphingobium sp.…”

mentioning

confidence: 99%