Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Pathotypes"”.
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Delineation of Aeromonas hydrophila Pathotypes by Dectection of Putative Virulence Factors using Polymerase Chain Reaction and Nematode Challenge Assay
… of humans and other vertebrates. To delineate pathotypes, the genomes of twenty-eight <em>Aeromonas </em>isolates<em> </em>were screened by PCR to determine the presence of virulence factors including: aerolysin (<em>aerA</em>)<em>, </em>cytotoxic enterotoxin (<em>act</em>), hemolysin …
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Caractérisation génotypique et phénotypique d’isolats de Xanthomonas hortorum pv. vitians causant la tache bactérienne de la laitue au Canada
… au Canada, d’identifier et de distinguer les pathotypes présents et enfin, de fournir des outils diagnostiques permettant la détection de ces pathotypes, à partir de cultures pures, en utilisant des techniques de qPCR. La réception hebdomadaire d’échantillons de laitues symptomatiques durant …
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Phytophthora Sojae Infecting Soybean: Pathotype Diversity, New Sources of Resistance and Interaction with the Soybean Cyst Nematode
… new sources of resistance to two virulence pathotypes of <em>P. sojae</em> in a recombinant inbred line (RILs) population derived from the cross between cultivated <em>Glycine max</em> (cv. Surge) and wild Glycine soja (PI 468916); and 3) to study the interaction between SCN and <em>P. …
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Comparative Whole-genome and Phenotype Analyses of Virulence Factors and Lethality in Nematode Challenge Assay among Aeromonas isolates
… survival, and supported the existence of pathotypes; however, no single common virulence factors was found to explain the difference between highly virulent strains and those significantly less virulent. The results indicated that 1) a primary virulence factor responsible for the high …
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Characterization of oomycete species causing soybean diseases in Illinois and management applications
… differentials with known Rps genes. Sixteen pathotypes were identified among the Ph. sojae isolates, and no pathotypes were identified for Ph. sansomeana. The aggressiveness and fungicide sensitivity of the isolates was also evaluated. Aggressiveness assays were performed in the greenhouse …
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An agent-based model to simulate virus-based biocontrol for the soybean cyst nematode, Heterodera glycines
… found to be dependent on virulence and fidelity. Pathotypes with high starting virulence resulted in premature peaked mortalities which suggested shorter lifetime transmission. Furthermore, virulence and fidelity were inversely related in pathotypes with the highest mortalities. Further, these …
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Characterization of diarrhoeagenic escherichia coli and human norovirus from daycare centres in the Vhembe Region of the Limpopo Province
… (13.6%); several bacterial co-infections among pathotypes were observed. Norovirus prevalence in this study, was detected in 5% of handwash samples of the children, 10% from handwash samples of the workers and 27% were stool specimens. All detected samples were co-infection between bacterial …
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Barley pathogens in Iceland: Identification, virulence and genetic structure of major barley pathogens in Iceland
… R. secalis isolates were grouped into eleven pathotypes and twenty P. teres isolates were grouped into nineteen pathotypes. None of the barley cultivars currently used in Iceland were resistant to a mixture of Icelandic P. teres isolates. These findings suggest that the Icelandic R. secalis …
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Assessment of microbial quality and safety of ground beef/product sold in differrent retailers around Thohoyandou Area, Vhembe District, Limpopo
… to determine different virulence genes and pathotypes. Hemolysin test was done in blood agar plates to identify virulence characteristics of E. coli isolates. Results: Out of 160 samples analyzed, E. coli was detected in 80 (50%), Staphylococcus spp. in 117 (73.12%), Salmonella in 60 …
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Fingerprinting and characterisation of Escherichia coli isolates using DNA arrays
… eight reference strains, including different pathotypes, 72 strains from the ECOR collection, and 49 clinical isolates. A wide range of E. coli pathogenicity markers was detected. The pathogenicity markers that were most common include chuA and iucC, which are both involved in iron metabolism. …
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Defining genomic drivers of evolution in the entomopathogenic Serratia spp. A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
… has been implicated in causing diverse disease pathotypes in grass grub larvae and larvae of other endemic scarabs (Pyronota spp.). As some isolates have a broader host range than S. entomophila, there is potential for S. proteamaculans to be a more suitable candidate for future biocontrol …
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Characterization of Flax Germplasm for Resistance to Fusarium Wilt Caused by Fusarium oxysporum f. sp. lini
… genes to develop flax cultivars resilient to Fol pathotypes.
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A genome-wide association study of resistance to the yellow rust pathogen (Puccinia striiformis f. sp. tritici) in elite UK wheat germplasm
… historical data focused on specific Pst pathotypes and de novo seedling tests identified markers linked to known racespecific Yr genes Yr6, Yr7, Yr9, Yr17 and Yr32. When evaluated against current Pst races in the field, 35% of the lines from the panel presented repeatedly a high level of …
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USE OF BIOCHAR, OBTAINED FROM THE VALORISATION OF AGRO-RESIDUAL BIOMASS, AS FUNCTIONAL FEED FOR MONOGASTRIC ANIMALS
… capacity against major Escherichia coli pathotypes, and prebiotic activity on Lactobacillus strains. To further explore possible mechanisms of action, gene expression analyses were performed using quantitative real-time PCR (qPCR), with a focus on quorum sensing pathways, particularly …
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Rice Blast Disease in the U.S. and Africa: Determination of Pathogen Diversity and the Identification of Resistance Genes for Disease Management
… each country. Among isolates from the U.S, four pathotypes were distinguished based on differentials with the CO39 genetic background whereas 10 were distinguished based on the differentials with the LTH background. The R gene Pi9 was the most effective against isolates from both Africa and the …
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Genetic diversity and pathogenicity of pea downy mildew (Peronospora viciae f. sp. pisi) in New Zealand : A thesis submitted in partial fulfilment of the requirements for the Degree of Master of Applied Science at Lincoln University
… towards cultivars. To date, there are 14 known pathotypes of Pvp throughout global pea growing regions but the New Zealand Pvp population has not been examined. This is the first study in New Zealand to assess the genetic diversity of Pvp. The results has indicated that the causal organism of …
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Intraspecific Variability within Globodera tabacum solanacearum and Selection for Virulence Against Flue-Cured Tobacco
… variation than that observed across different pathotypes of the closely related potato cyst nematode, Globodera pallida. This result suggests that the emergence of resistance-breaking biotypes is more likely than previous research suggests. If a new pathotype is reported, a RAPD marker …
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Limits of detection of Magnaporthe oryzae Triticum pathotype in wheat seed: implications for pathogen dissemination
… the Triticum pathotype from other M. oryzae pathotypes as well as demonstrated no interference from wheat seed DNA. This study provides evidence that to establish pathogen detection thresholds in plant seed, both disease incidence and severity must be evaluated to reduce the probabilities of …
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Epidemiología molecular en Escherichia coli procedente de fauna salvaje: resistencia antimicrobiana, virulencia y diversidad y diversidad genética
… potential wild reservoirs of zoonotic E. coli pathotypes. In the first and second chapters, population structure and antimicrobial resistance of E. coli from wildlife were investigated. A low to moderate frequency of antibiotic resistant strains was observed in mammals (11.1%), predominantly …