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 29 for “"R-genes"”.
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Understanding Plant Pathosystems in Wild Relatives of Cultivated Crop Plants
… is not only defeating current resistance genes (R genes) but chemical controls as well. Phytophthora sojae (P. sojae), the causal agent of Phytophthora root and stem rot disease, reduces soybean harvests worldwide. We developed an approach to screen for new R genes that recognize core …
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Selection for Run1-Ren1 Dihybrid Grapevines Using Microsatellite Markers
… of Ren1 and Run1 powdery mildew resistance (R) genes were tracked in a grapevine hybrid family using flanking microsatellite markers. Segregation of the powdery mildew resistance phenotype was evaluated under in vitro and greenhouse conditions independently of the genotype data. Combined …
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Tetracycline resistance and its dissemination in the Bacteroides group
… new class of ribosome protection Tc$\sp{\rm r}$ genes which was designated TetQ, because it has a deduced amino acid sequence that is 40% identical to TetM or TetO (which are $>$75% identical). A deep evolutionary relationship was found to exist between the ribosome protection Tc$\sp{\rm r}$ …
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Molecular Analysis of Oomycete Pathogens to Identify and Translate Novel Resistance Mechanisms to Crops
… potential new and durable resistance (R) genes against P. sojae in soybean germplasm. We developed a system to screen soybean germplasm for genes that recognize core Phytophthora sojae RXLR effectors that are conserved within the pathogen species and essential for virulence. R genes that …
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Using Synthetic Gene Clusters to Model Resistance Gene Evolution by Meiotic Recombination in Arabidopsis thaliana
… of constitutively expressed resistance (R) genes. R genes recognize pathogen gene products as signals of invasion. We are interested in how plants evolve R genes to keep pace with rapidly evolving pathogen populations. The mechanisms that drive the evolution of new R genes are poorly …
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A Comprehensive Analysis of Rust Disease Resistance in the Bioenergy Plant Switchgrass (Panicum virgatum L.)
… loci (QTLs) and major plant disease resistance genes (R) in switchgrass breeding programs could offer broad spectrum and durable disease resistance in commercial switchgrass cultivars. 'Alamo', a lowland cultivar, is generally resistant to switchgrass rust whereas 'Dacotah', an upland cultivar, …
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Identification, Validation, and Mapping of Phytophthora sojae and Soybean Mosaic Virus Resistance Genes in Soybean
… with core effectors to identify resistance genes (R-genes) that will be durable under field conditions. Four segregating populations and two recombinant inbred line (RIL) populations have been screened with core effectors. Effector-based screening methods were combined with pathogen-based …
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Toward the understanding of TIR-NB-LRR–mediated immunity; study of the AvrRps4 recognition model in Arabidopsis
… In Arabidopsis, two TIR-NB-LRR encoding R genes, RRS1 and RPS4, are in a head-to-head arrangement on chromosome 5. They interact to confer recognition to AvrRps4 and (with the right allele of RRS1) PopP2, two bacterial effectors, from Pseudomonas syringae and Ralstonia solanacearum …
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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
… 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 U.S. isolates were in three vegetative compatibility groups (VCGs), whereas isolates …
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Characterization of Hessian fly from Israel
… of effector proteins, of virulence to Hf R genes when resistant wheat cultivars are 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 …
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Investigating R gene evolution by meiotic recombination using synthetic gene clusters in Arabidopsis
… This results in the formation of chimeric genes that may impart a novel function. However, the frequency and functional consequences of these unequal cross-over events are poorly characterized. Plant disease resistance genes (R genes) genes are frequently organized as gene clusters. In this …
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Inheritance of virulence in the root rot pathogen Phytophthora sojae
… 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 crosses and self-fertilizations were performed. …
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Cucurbit Downy Mildew (Pseudoperonospora cubensis): Cucumber Resistance
… conducted, comparing the relative expression of genes encoding a basic PR-1 protein, a cytosolic ascorbate peroxidase protein and three resistance (R) gene proteins, in nineteen cultivars. All of the selected genes were analyzed using real-time PCR. The relative expression levels of the R-genes …
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Dissecting Transcriptional Regulation of Rpp8 in Arabidopsis thaliana
… upregulation during pathogen or SA treatment. R genes may be induced as part of global defense responses, which could prime the host for more effective pathogen recognition.
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Identifying loci conferring quantitative disease resistance in sorghum and maize against fungal foliar pathogens
… as guardees/decoys with pathogen Avr proteins. R genes are generally race specific. Quantitative disease resistance (QDR) is genetically complex with a partial phenotype conferred by multiple small effect genes. In some instances genes and loci associated with QDR confer broad spectrum resistance …
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Genic copy number variation associated with abiotic/biotic stress among a set of progenitors of contemporary maize germplasm
… specifically characterize variation occurring in genes associated with abiotic/biotic stress tolerance. To facilitate SV discovery those read sequences not aligning to B73 reference genome were first assembled and then bioinformatically characterized. This resulted in the discovery of 37 putative …
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Gene expression and signaling in Rxo1 governed innate immunity in cereals
… andropogonis (Ba) carrying the effector genes avrRxo1 or avrRba1 respectively. Interestingly, when expressed as a transgene in rice, Rxo1 also confers a strong and rapid HR to Xoc strains harboring the avrRxo1 type III effector gene. To gain insights into the Rxo1 signaling network, we …
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The Efficacy of Allopurinol in Suppressing Hypersensitive-like Symptoms in Wheat (Triticum aestivum L.) and in Suppressing Sunflower Rust (Puccinia helianthi) Symptoms
… (<em>Puccinia helianthi</em>) can overcome R-genes in sunflower (<em>Helianthus annuus</em> L.) resulting in significant yield losses. Allopurinol has effectively reduced rust-disease symptoms in other crops but has not been applied in to sunflower. Different concentrations of allopurinol were …
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Suppression and triggering of Arabidopsis immunity by Albugo species
… isolate Nc14 (AlNc14) genome reveals 13032 genes encoded in a ~37 Mb genome. We analyze the effector complement of AlNc14 and find known effector classes but also classes unique to A. laibachii. Experiments reveal that CHXCs are a novel class of effectors that suppress host defense. We …
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Molecular Basis of Pathogenesis and Host Determination in Cercospora sojina: from Phenotypic to Genotypic Patterns
… to overcome resistance conveyed by single R-genes (resistance genes) of soybeans, followed by the emergence of new physiological races. Although understanding population genomics and the virulence gene inventories in fungal plant pathogens is extremely important to improve disease control …
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