Littérature scientifique sur le sujet « Xanthomonas campestris – Dissertation universitaire »
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Thèses sur le sujet "Xanthomonas campestris – Dissertation universitaire"
Garin, Tiffany. « Impact des compétitions inter-microbiennes médiées par le Système de Sécrétion de Type VI (T6SS) sur la dynamique de transmission du microbiote des graines aux plantules ». Electronic Thesis or Diss., Angers, 2024. https://dune.univ-angers.fr/documents/dune18434.
Texte intégralSeeds represent the initial inoculum source for plant microbiota. During germination, the release of exudates near the seeds triggers intense microbial competitions, which play a pivotal role in the assembly of the plant microbiota. This thesis work aims to explore the role of interference competition mediated by the Type VI secretion system (T6SS). The T6SS of a strain of Stenotrophomonas rhizophila, a bacterium efficiently transmitted to seedlings, was used as a study model. This T6SS inhibits the growth of many bacterial species in vitro, including the phytopathogenic strain Xanthomonas campestris pv. campestris 8004 (Xcc8004). This inhibition of bacterial growth is correlated with the phylogenetic and metabolic proximity between S. rhizophila and the tested bacterial species. The antimicrobial activity of S. rhizophila T6SS limits the transmission of Xcc8004 from radish seed to seedling under gnotobiotic conditions. Its activity also influences the dynamics of bacterial community assembly during the seed-to-seedling transition in non sterile soil. The composition of the co-inoculated microbial consortium on the seed affects the competitive advantage conferred by the T6SS to S. rhizophila. Therefore, T6SS-mediated interference competition plays a significant role in the assembly dynamics of the plant microbiota, and the inoculation of bacterial consortia composed of T6SS-carrying bacteria appears as a potential solution for reducing the transmission of phytopathogenic agents to seedlings
Hausner, Jens [Verfasser], D. [Akademischer Betreuer] Büttner, R. B. [Akademischer Betreuer] Klösgen et M. [Akademischer Betreuer] Göttfert. « Funktionsanalyse von Komponenten des Typ III-Sekretionssystems aus Xanthomonas campestris pv. vesicatoria : [kumulative Dissertation] / Jens Hausner. Betreuer : D. Büttner ; R. B. Klösgen ; M. Göttfert ». Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1066238448/34.
Texte intégralSchulze, Sebastian [Verfasser], U. [Akademischer Betreuer] Bonas, D. [Akademischer Betreuer] Scheel et M. [Akademischer Betreuer] Göttfert. « Molekulare und funktionelle Charakterisierung der Typ III-Effektoren XopB, XopL und XopS aus Xanthomonas campestris pv. vesicatoria : [kumulative Dissertation] / Sebastian Schulze. Betreuer : U. Bonas ; D. Scheel ; M. Göttfert ». Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2013. http://d-nb.info/1043196846/34.
Texte intégralSchmidtke, Cornelius [Verfasser], U. [Akademischer Betreuer] Bonas, G. [Akademischer Betreuer] Sawers et W. [Akademischer Betreuer] Hess. « Identifizierung neuer nicht-kodierender RNAs in Xanthomonas campestris pv. vesicatoria und funktionelle Charakterisierung der regulatorischen RNA sX13 : [kumulative Dissertation] / Cornelius Schmidtke. Betreuer : U. Bonas ; G. Sawers ; W. Hess ». Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1052221238/34.
Texte intégralMerda, Déborah. « Histoire évolutive de Xanthomonas arboricola, espèce bactérienne composée de souches pathogènes et commensales ». Thesis, Angers, 2016. http://www.theses.fr/2016ANGE0028/document.
Texte intégralDeciphering the evolutionary history of bacterial populations associated to plants is necessary to understand diseaseemergence in agroecosystems. The aim of this study is to unveil the evolutionary events responsible for pathogeniclineages or pathovar emergences in Xanthomonas arboricola. This species is composed of both plant pathogenic andcommensal strains Population genetics analyses and gain and loss inferences of virulence factors showed that X. arboricola exhibits an epidemic population structure, within which epidemic clones emerged from a recombinogenic background population following virulence factor acquisition. Population genomics and inference of divergence scenarii between epidemic clones and the network of recombinant strains showed persistence of homologous recombination along divergence of these two groups, with an asymmetric gene flux from pathogenic strains to commensal ones. Finally, evolutionary history of the type three secretion system (T3SS), the main virulence factor in Xanthomonas genus, was studied at genus scale and showed that T3SS was ancestrally acquired and lost in commensal strains. Altogether these analyses allowed us to show that the common ancestor of X.arboricola had virulence factors, and that within commensal strains, some lost these virulence factors whereas others kept the ancestral repertoire. These latter strains have a similar repertoire to that of some pathogenic strains, and could represent a risk for new disease emergence. Functional genomics could allow us to validate these hypotheses