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.
Results
Showing 1 to 20 of 26 for “"avirulence"”.
-
Residual gene resistance using the crown rust of oats pathosystem
… with a pathogen lacking the corresponding avirulence genes. Pyramiding resistance genes may produce durable, effective resistance against many pathogen races. This hypothesis was tested in three experiments using the crown rust of oats pathosystem.
-
Characterization of Hessian fly from Israel
… not deployed, and of the genetic inheritance of avirulence genes (Avr) in virulent Hf. This will allow advancement in the understanding of the Hf-wheat interaction that can be used to create more effective and long-lasting control of Hf in US. Samples of a dipteran pest of wheat from multiple …
-
Caractérisation moléculaire de la spécificité d'organe chez Phytophthora infestans, agent causal du middiou de la pomme de terre
… R, il est également qualifié de facteur d'avirulence (Avr). De plus en plus, les approches d'amélioration génétique tentent de tirer profit de ces facteurs d'avirulence afin d'accélérer l'identification de nouveaux cultivars résistants. Chez la pomme de terre (Solanum tuberosum), une …
-
Inheritance of virulence in the root rot pathogen Phytophthora sojae
… of soybean plants. The interaction of pathogen avirulence (Avr) and host resistance (R)-genes determine the disease outcome. The Avr3a mRNA transcript level is variable among P. sojae strains and determines virulence towards the R-gene Rps3a. To study the inheritance of virulence, genetic …
-
Maize R gene Rxo1 Confers Disease Resistance on Pepper and Nicotiana benthamiana
… localization of AvrRxo1 was required for its avirulence and virulence functions. In addition, the cytosol localization of Rxo1 was also necessary to confer disease resistance. The downstream signaling component NbNDR1 was demonstrated to be involved in Rxo1/AvrRxo1-mediated disease resistance. …
-
DISCOVERY AND FUNCTIONAL ANALYSES OF HESSIAN FLY EFFECTOR-ENCODING GENES
… resistance (R) proteins to perceive the insect avirulence effectors (Avr) and display defensive immune responses. This study is focused in the discovery and functional analyses of insect effector-encoding genes. Chapter one of this thesis offers an introduction about the molecular basis of …
-
REGULATION OF DEFENSE RESPONSES MEDIATED BY BON1 AND BAP2 IN ARABIDOPSIS THALIANA
… This is mediated by the recognition of specific avirulence (Avr) proteins from the pathogen by resistance (R) proteins in the plant. A member of the evolutionarily conserved copine family, BONZAI 1 (BON 1) is a key regulator of defense responses in A. thaliana. BON1 has been shown to negatively …
-
Approaches towards disease resistance to filamentous pathogens
… recognize pathogen effector proteins with avirulence activities, leading to a response known as effector-triggered immunity (ETI). R3a and I2 are orthologous NLRs from potato and tomato responding to effectors of P. infestans and the wilt fungus Fusarium oxysporum f. sp. lycopersici, …
-
The Genetic basis of resistance and susceptibility in the Albugo laibachii-Arabidopsis thaliana pathosystem
… method to identify Al effectors: clone “avirulence (Avr) genes”. These typically encode effectors that are recognized and trigger a strong response by the immune system of some host accessions. I identified and sequenced four Al isolates from field samples. Using differential phenotype …
-
Identification of new functional resistance genes against <i>P. infestans </i>in <i>Solanaceae</i> species
… in breeding programs and to identify the cognate avirulence gene, Avr-Ph3. In addition, the new probe library was assessed in silico to evaluate if it would have enabled the identification of Rpi-Ph3 and homologous sequences. The identification of Avr-Ph3 was established through a large effector …
-
Structural basis for interactions of the Phytophthora sojae RxLR effector Avh5 with phosphatidylinositol 3-phosphate and for host cell entry
… characterized the P. sojae effector, avirulence homolog-5 (Avh5). Using NMR spectroscopy, I demonstrate that Avh5 is helical in nature with a long N-terminal disordered region. Heteronuclear single quantum coherence titrations of Avh5 with the PtdIns(3)P head group, inositol …
-
ECOLOGICAL PERSPECTIVES ON HOST-PARASITE COEVOLUTION
… gene normally results in the matching parasite avirulence gene rapidly becoming locally extinct. Simple genetic models of GFG coevolution do not produce stable polymorphism. Various more complex models do but are difficult to analyse. Recent work has shown a factor common to stable models is …
-
Molecular basis of plant cell death suppression by the phytophthora infestans effector AVR3a
… the potato protein R3a can recognize AVR3a. The avirulence and suppression activities of this effector are conditioned by distinct amino acids but the precise series of events leading to ICD suppression by AVR3a, the nature of the INF1 receptor, and the composition of the receptor complex remain …
-
Characterisation of candidate effector proteins from barley pathogen <i>Rhynchosporium commune</i>
… gene sequence of Rc2 correlate with virulence/avirulence of the R. commune strains in the barley line SLB 10-009. Finally, targeted gene disruption was used as an approach to characterise RcCDI1, Rc2 and<br/>Rsu3_07158 candidate effectors.
-
Molecular Basis of Pathogenesis and Host Determination in Cercospora sojina: from Phenotypic to Genotypic Patterns
… differential infection responses (virulence or avirulence) on cultivars Blackhawk and Hood followed by mapping to the recently assembled C. sojina strain 2.2.3 reference genome. From the 18004 SNPs identified among the two subcollections, 75 SNPs showed an Fst> 0.2 and were localized within …
-
Transcriptomic studies of the early stages of potato infection by <i>Phytophthora infestans</i>
… was further supported by the co-expression of avirulence genes such as Avr2 and Avr3a. A set of 17 transcripts, including six cytoplasmic effectors (RxLR effectors), as well as a transcript encoding an apoplastic effector (glucanase inhibitor), was found to be infection-specific, supporting the …
-
Investigation of the recognition and host target of the Phytophthora infestans effector PiAVR2
… effector PiAVR2 and the means by which this avirulence protein is recognised by the potato resistance protein, R2. Prior to this PhD, forward genetic studies identified three RXLR effector encoding genes within the AVR2 locus. By use of transient co-expression with the resistance gene R2 it …
-
Rice Blast Disease in the U.S. and Africa: Determination of Pathogen Diversity and the Identification of Resistance Genes for Disease Management
… as well as determination of variation in the avirulence gene AVRPiz-t in isolates from Africa. Also, evaluation of blast resistance genes in the interspecific rice germplasm “New Rice for Africa” NERICA was done using F2 progeny of the cross of U.S. susceptible cultivar M204 and NERICA 12. The …
-
"Physiological and Molecular Analysis of Dnd ""Defense, No Death"" Mutants of Arabidopsis"
… HR when inoculated with P. syringae carrying the avirulence gene avrRpt2. The first objective of this study was to characterize the dnd2 mutants in relation to defense. Like the previously characterized dnd1 mutant plants, dnd2 mutants responded to avirulent pathogens by activating avr-dependent …
-
Exploring Genome Structure and Gene Regulation Related to Virulence in Fungal Phytopathogens Using Next Generation Sequencing Techniques
… large scale mutagenesis project to identify two avirulence genes in M. oryzae by generating random mutants, followed by a pathogenicity screen on rice cultivars containing the corresponding resistance genes. Although imperfections and challenges remain, this dissertation shows four successful NGS …
Page 1 of 2