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Évolution de la virulence de V. crassostreae en lien avec l’huître en tant qu’hôte et les phages en tant que prédateurs ArchiMer
Piel, Damien.
Understanding the ecological and evolutionary dynamics of infectious agents is important for diagnosing, predicting and preventing diseases in farmed and wild species. This project was aimed at studying the evolution of V. crassostreae virulence in relation to the oyster as a host and to the phages as predators. We identified the molecular mechanisms leading to the adaptation of vibrios to oysters. We demonstrated the emergence of virulent strains of V. crassostreae in the area impacted by the juvenile oyster mortality syndrome. The emergence of more virulent V. crassostreae strains is linked to the acquisition of a plasmid encoding a type 6 secretion system responsible for lethal activity towards oyster hemocytes. This project also provides knowledge on...
Tipo: Text Palavras-chave: Vibrio; Interactions hôte/parasite; Emergence de pathogènes; Bactériophages; V. crassostreae; Mécanismes moléculaires; Vibrio; Host/parasite interactions; Pathogen emergence; Bacteriophages.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00690/80203/83289.pdf
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The Urochloa foliar blight and collar rot pathogen Rhizoctonia solani AG-1 IA emerged in South America via a host shift from rice. Repositório Alice
MESA, E. C.; CERESINI, P. C.; MOLINA, L. M. R.; PEREIRA, D. A. S.; SCHURT, D. A.; VIEIRA JUNIOR, J. R.; POLONI, N. M.; MCDONALD, B. A..
The fungus Rhizoctonia solani anastomosis group (AG)-1 IA emerged in the early 1990s as an important pathogen causing foliar blight and collar rot on pastures of the genus Urochloa (signalgrass) in South America. We tested the hypothesis that this pathogen emerged following a host shift or jump as a result of geographical overlapping of host species. The genetic structure of host and regional populations of R. solani AG-1 IA infecting signalgrass, rice, and soybean in Colombia and Brazil was analyzed using nine microsatellite loci in 350 isolates to measure population differentiation and infer the pathogen reproductive system. Phylogeographical analyses based on the microsatellite loci and on three DNA sequence loci were used to infer historical migration...
Tipo: Artigo de periódico Palavras-chave: Pathogen emergence; Pathogen origins; Gene flow.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1041022
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