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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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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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The effect of Photorhabdus luminescens (Enterobacteriaceae) on the survival, development, reproduction and behaviour of Caenorhabditis elegans (Nematoda : Rhabditidae) Inra
Sicard, M.; Hering, S.; Schulte, R.; Gaudriault, S.; Schulenburg, H..
The free-living soil nematode Caenorhabditis elegans interacts with diverse microorganisms in its natural habitat. These microorganisms may serve as a food source or represent a harmful threat. As such, they constitute one of the most important ecological factors of the worm's natural environment. In this study, we examined the interaction between two natural isolates of C. elegans and three natural isolates of the entomopathogenic bacterium Photorhabdus luminescens. Two of the tested P. luminescens strains were clearly pathogenic. They consistently reduced the worm's developmental, survival and reproductive rate, most likely through the production of nematicidal compounds. The third natural isolate tested did not decrease worm fitness. These differences...
Tipo: Journal Article Palavras-chave: ENTOMOPATHOGENIC BACTERIUM; SOIL NEMATODE; STATISTICAL ANALYSIS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008ef5a0cc1&uri=/notices/prodinra1/2009/03/
Registros recuperados: 5
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