نتایج جستجو برای: avirulent pathogens

تعداد نتایج: 71282  

Journal: :Science 2003
Peter H Thrall Jeremy J Burdon

In a wild plant-pathogen system, host resistance and pathogen virulence varied markedly among local populations. Broadly virulent pathogens occurred more frequently in highly resistant host populations, whereas avirulent pathogens dominated susceptible populations. Experimental inoculations indicated a negative trade-off between spore production and virulence. The nonrandom spatial distribution...

Journal: :Molecular microbiology 1997
T K McDaniel J B Kaper

Attaching and effacing (AE) bacteria are a diverse group of gastrointestinal pathogens, comprising members of four genera, that cause the intestinal epithelial microvilli to be replaced with raised clusters of filamentous actin that conform to the surface of attached bacteria. We have cloned a 35.4 kb 'pathogenicity island' from the prototype AE bacterium, enteropathogenic Escherichia coli, con...

Journal: :Epidemiology and infection 2002
P J White R A Norman P J Hudson

A number of pathogens cause chronic infection in survivors of acute disease and this is believed to be a common means of persistence, including for highly virulent agents. We present a model in which transmission from chronically infected hosts causes chronic infection in naive individuals, without causing acute disease--indeed 'protecting' against it. Thus the pathogen obtains the benefit of v...

2007
Javier Santander James Robeson

*Corresponding author Phage therapy has been used in the past as an alternative therapy against bacterial pathogens. However, phage-resistant bacterial strains can emerge. Some studies show that these phage-resistant strains are avirulent. In this study, we report that phage-resistant strains of Salmonella enterica serovar Enteritidis (hereafter S. Enteritidis) were avirulent in the Caenorhabdi...

Journal: :Journal of immunology 1999
C Capo F P Lindberg S Meconi Y Zaffran G Tardei E J Brown D Raoult J L Mege

Several intracellular pathogens exploit macrophages as a niche for survival and replication. The success of this strategy requires the subversion or the avoidance of microbicidal functions of macrophages. Coxiella burnetii, the agent of Q fever, is a strictly intracellular bacterium that multiplies in myeloid cells. The survival of C. burnetii may depend on the selective use of macrophage recep...

2002
Hui Cao Xinnian Dong

Systemic acquired resistance (SAR) is a general defense response in plants that is characterized by the expression of pathogenesis-related (PR) genes. SAR can be induced after a hypersensitive response to an avirulent pathogen or by treatment with either salicylic acid (SA) or 2,Cdichloroisonicotinic acid (INA). To dissect the signal transduction pathway of SAR, we isolated an Arabidopsis mutan...

Journal: :پژوهش های تولید گیاهی 0

plants showing root and crown rot were collected from 48 bean fields in the khuzestan and markazi provinces during 2005-2006. using specific primers (fsphr/fsphf) for these forma specialis, three isolates were identified as f.s. f.sp. phaseoli. conidial suspension of one of these isolates were irradiated (in a 60co- gamma cell with activity of 2500 curi and 0.38 grey per second dose rates) with...

Journal: :European journal of biochemistry 2003
Beatrice Belenghi Filippo Acconcia Maurizio Trovato Michele Perazzolli Alessio Bocedi Fabio Polticelli Paolo Ascenzi Massimo Delledonne

In plants, cysteine protease inhibitors are involved in the regulation of protein turnover and play an important role in resistance against insects and pathogens. AtCYS1 from Arabidopsis thaliana encodes a protein of 102 amino acids that contains the conserved motif of cysteine protease inhibitors belonging to the cystatin superfamily (Gln-Val-Val-Ala-Gly). Recombinant A. thaliana cystatin-1 (A...

2016
Jamshaid Hussain Jian Chen Vittoria Locato Wilma Sabetta Smrutisanjita Behera Sara Cimini Francesca Griggio Silvia Martínez-Jaime Alexander Graf Mabrouk Bouneb Raman Pachaiappan Paola Fincato Emanuela Blanco Alex Costa Laura De Gara Diana Bellin Maria Concetta de Pinto Elodie Vandelle

The infection of Arabidopsis thaliana plants with avirulent pathogens causes the accumulation of cGMP with a biphasic profile downstream of nitric oxide signalling. However, plant enzymes that modulate cGMP levels have yet to be identified, so we generated transgenic A. thaliana plants expressing the rat soluble guanylate cyclase (GC) to increase genetically the level of cGMP and to study the f...

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