Your browser does not support JavaScript!

Home    Collections    Type of Work    Post-graduate theses  

Post-graduate theses

Current Record: 4967 of 6472

Back to Results Previous page
Next page
Add to Basket
[Add to Basket]
Identifier uch.biology.msc//2004sarris
Title Απομόνωση και βιολογικός χαρακτηρισμός, γονιδίων φυλετικής εξειδίκευσης από φυτοπαθογόνα βακτήρια του γένους Pseudomonas
Creator Sarris, Panayotis F
Abstract hrp genes control the ability of phytopathogenic bacteria to cause disease and to elicit hypersensitive reactions on resistant plants. Genetic and biochemical studies have demonstrated that Hrp proteins are components of type III secretion systems, regulatory proteins, proteinaceous elicitors of the hypersensitive reaction, and enzymes needed for synthesis of periplasmic glucans. Significantly, type III secretion systems are involved in the secretion of pathogenicity proteins in bacterial pathogens of animals. The transcriptional activation of a number of bacterial avirulence (avr) genes is controlled by Hrp regulatory proteins, and recent experimental evidence suggests that Avr proteins may be transported via Hrp secretion systems. It has also been hypothesized that pathogenicity and/or virulence gene products exit bacterial phytopathogens via Hrp pathways. Thus, hrp genes may be one of the most important groups of genes found in phytopathogenic bacteria in relationship to pathogenicity and host range. According to "gene-for-gene" theory, concerning interactions between plants and their pathogens, incompatibility (no disease) requires a dominant or semidominant resistance (R) gene in the plant, and the corresponding avirulence (avr) gene/protein in the pathogen. Many plant/pathogen interactions are of this type. R genes are presumed to (a) enable plants to detect avr-gene-specified pathogen molecules, (b) initiate signal transduction to activate defenses, and (c) have the capacity to evolve new R gene specificities rapidly. Isolation of R genes has revealed four main classes of R gene sequences whose products appear to activate a similar range of defense mechanisms. In this study, the functional specialization of racial specialization genes concerning the plant pathogenic bacterium Pseudomonas syringae pv. Tomato DC3000 was studied. The whole project was based on the detection of the avirulence phenotype in genetically characterized varieties of bean. The latter show known gene-to-gene reactions with the homologous avr genes from pathogenic in bean bacterium Pseudomonas syringae pv. phaseolicola
Issue date 2004-11-01
Date available 2004-12-15
Collection   School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/f/0/6/metadata-dlib-2004sarris.tkl Bookmark and Share
Views 267

Digital Documents
No preview available

Download document
View document
Views : 7