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Characterization of Xenorhabdus isolates from La Rioja ( Northern Spain) and virulence with and without their symbiotic entomopathogenic nematodes (Nematoda: Steinernematidae) Inra
Campos-Herrera, R.; Tailliez, P.; Pages, S.; Ginibre, N.; Gutiérrez, C.; Boemare, N..
Eighteen Xenorhabdus isolates associated with Spanish entomopathogenic nematodes of the genus Steinernema were characterized using a polyphasic approach including phenotypic and molecular methods. Two isolates were classified as Xenorhabdus nematophila and were associated with Steinernema carpocapsae. Sixteen isolates were classified as Xenorhabdus bovienii, of which fifteen were associated with Steinernema feltiae and one with Steinernema kraussei. Two X. bovienii Phase II were also isolated, one instable phase isolated from S. feltiae strain Rioja and one stable phase from S. feltiae strain BZ. Four representative bacterial isolates were chosen to study their pathogenicity against Spodoptera littoralis with and without the presence of their nematode...
Tipo: Journal Article Palavras-chave: ENTOMOPATHOGENIC BACTERIA AND NEMATODE; PATHOGENICITY; SPODOPTERA LITTORALIS; STEINERNEMA; XENORHABDUS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20108be8d96&uri=/notices/prodinra1/2010/10/
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Interspecific competition between entomopathogenic nematodes (Steinernema) is modified by their bacterial symbionts (Xenorhabdus) Inra
Sicard, M.; Hinsinger, J.; Le Brun, N.; Pages, S.; Boemare, N.; Moulia, C..
Background: Symbioses between invertebrates and prokaryotes are biological systems of particular interest in order to study the evolution of mutualism. The symbioses between the entomopathogenic nematodes Steinernema and their bacterial symbiont Xenorhabdus are very tractable model systems. Previous studies demonstrated (i) a highly specialized relationship between each strain of nematodes and its naturally associated bacterial strain and (ii) that mutualism plays a role in several important life history traits of each partner such as access to insect host resources, dispersal and protection against various biotic and abiotic factors. The goal of the present study was to address the question of the impact of Xenorhabdus symbionts on the progression and...
Tipo: Journal Article Palavras-chave: XENORHABDUS; STEINERNEMA; ENTOMOPATHOGENIC NEMATODE; HOST-SYMBIONT SPECIFICITY; MOLECULAR PHYLOGENY; SYMBIOSIS; DESCRIPTION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200877ef46a8&uri=/notices/prodinra1/2010/10/
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Isolation and identification of entomopathogenic nematodes and their symbiotic bacteria from Herault and Gard (Southern France) Inra
Emelianoff, V.; Le Brun, N.; Pages, S.; Stock, P.; Tailliez, P.; Moulia, C.; Sicard, M..
Isolation and identification of native nematode-bacterial associations in the field are necessary for successful control of endemic pests in a particular location. No study has yet been undertaken to recover and identify EPN in metropolitan France. In the present paper, we provide results of a survey of EPN and their symbiotic bacteria conducted in Herault and Gard regions in Southern France. Molecular characterization of isolated nematodes depicted three different Steinernema species and one Heterorhabditis species, H. bacteriophora. Steinernema species recovered were identified as: S. feltiae and S. affine and an undescribed species. Xenorhabdus symbionts were identified as X. bovienii for both S. feltiae and S. affine. Phylogenetic analysis placed the...
Tipo: Journal Article Palavras-chave: ENTOMOPATHOGENIC NEMATODE; STEINERNEMA; HETEROHABDITIS; PHOTORHABDUS; XENORHABDUS; HOST-SYMBIONT SPECIFICITY; MOLECULAR PHYLOGENY; SYMBIOSIS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20085b9dadd7&uri=/notices/prodinra1/2009/03/
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Manifold aspects of specificity in a nematode–bacterium mutualism Inra
Chapuis, E.; Emelianoff, V.; Paulmier, V.; Le Brun, N.; Pages, S.; Sicard, M.; Ferdy, J.B..
Coevolution in mutualistic symbiosis can yield, because the interacting partners share common interests, to coadaptation: hosts perform better when associated with symbionts of their own locality than with others coming from more distant places. However, as the two partners of a symbiosis might also experience conflicts over part of their life cycle, coadaptation might not occur for all life-history traits. We investigated this issue in symbiotic systems where nematodes (Steinernema) and bacteria (Xenorhabdus) reproduce in insects they have both contributed to kill. Newborn infective juveniles (IJs) that carry bacteria in their intestine then disperse from the insect cadaver in search of a new host to infect. We ran experiments where nematodes coinfect...
Tipo: Journal Article Palavras-chave: COADAPTATION; MUTUALISM; SPECIFICITY; STEINERNEMA; XENORHABDUS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011a41bb11e&uri=/notices/prodinra1/2011/05/
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Optical mapping as a routine tool for bacterial genome sequence finishing Inra
Latreille, P.; Norton, S.; Goldman, B.S.; Henkhaus, J.; Miller, N.; Barbazuk, B.; Bode, H.B.; Darby, C.; Du, Z.; Forst, S.; Gaudriault, S.; Goodner, B.; Goodrich-Blair, H.; Slater, S..
Background: In sequencing the genomes of two Xenorhabdus species, we encountered a large number of sequence repeats and assembly anomalies that stalled finishing efforts. This included a stretch of about 12 Kb that is over 99.9% identical between the plasmid and chromosome of X. nematophila.Results: Whole genome restriction maps of the sequenced strains were produced through optical mapping technology. These maps allowed rapid resolution of sequence assembly problems, permitted closing of the genome, and allowed correction of a large inversion in a genome assembly that we had considered finished.Conclusion: Our experience suggests that routine use of optical mapping in bacterial genome sequence finishing is warranted. When combined with data produced...
Tipo: Journal Article Palavras-chave: XENORHABDUS ; STEINERNEMA; SYMBIOTIC BACTERIA; OPTICAL MAPPING; ENTOMOPATHOGENIC NEMATODE; PHOTORHABDUS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010e8e83aa6&uri=/notices/prodinra1/2010/10/
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Stages of infection during the tripartite interaction between Xenorhabdus nematophila, its nematode vector, and insect hosts Inra
Sicard, M.; Brugirard-Ricaud, K.; Pages, S.; Lanois, A.; Boemare, N.; Brehélin, M.; Givaudan, A..
Bacteria of the genus Xenorhabdus are mutually associated with entomopathogenic nematodes of the genus Steinernema and are pathogenic to a broad spectrum of insects. The nematodes act as vectors, transmitting the bacteria to insect larvae, which die within a few days of infection. We characterized the early stages of bacterial infection in the insects by constructing a constitutive green fluorescent protein (GFP)-labeled Xenorhabdus nematophila strain. We injected the GFP-labeled bacteria into insects and monitored infection. We found that the bacteria had an extracellular life cycle in the hemolymph and rapidly colonized the anterior midgut region in Spodoptera littoralis larvae. Electron microscopy showed that the bacteria occupied the extracellular...
Tipo: Journal Article Palavras-chave: XENORHABDUS; ENTOMOPATHOGENIC NEMATODE; STEINERNEMA; GFP-LABELED; INTESTINAL VESICLE; SPODOPTERA.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008345034c5&uri=/notices/prodinra1/2009/03/
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Steinernema sichuanense n. sp (Rhabditida, Steinernematidae), a new species of entomopathogenic nematode from the province of Sichuan, east Tibetan Mts., China Inra
Mracek, Z.; Nguyen, K.B.; Tailliez, P.; Boemare, N.; Chen, S..
Steinernema sichuanense n. sp. is characterized by male, female and IJ. For male, the spicules are robust with prominent rostrum; gubernaculum has blunt anterior end; cuneus is arrow-shaped, pointed posteriorly. Second-generation male has a prominent mucron. For female, tail usually has one to four papillae-like projections on tail tip; post anal swelling is absent. For U, body length is about 7 10 gm; lateral field has six ridges; the formula of lateral field is 2, 5, 6, 4, 2 with two prominent submarginal ridges; tail usually has a dorsal depression. In Steinernema affine/intermedium group, the U of S. sichuanense n. sp. differs from S. affine by its absence of the internal tail spine; differs from Steinernema beddingi by its six ridges in lateral field...
Tipo: Journal Article Palavras-chave: DESCRIPTION; ENTOMOPATHOGENIC NEMATODE; INSECT PARASITE; MOLECULAR; NEW SPECIES; PHYLOGENETIC SYSTEMATIC; STEINERNEMA; XENORHABDUS; TAXONOMY.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008a03b64c&uri=/notices/prodinra1/2009/03/
Registros recuperados: 7
Primeira ... 1 ... Última
 

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