Download or read book Fine Mapping of a Stripe Rust Resistance Gene Transferred from Triticum Monococcum L Into Hexaploid Wheat Triticum Aestivum L written by Simarjit Kaur and published by . This book was released on 2008 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alien Introgression in Wheat written by Márta Molnár-Láng and published by Springer. This book was released on 2015-11-20 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of the latest advancements in the field of alien introgression in wheat. The discovery and wide application of molecular genetic techniques including molecular markers, in situ hybridization, and genomics has led to a surge in interspecific and intergeneric hybridization in recent decades. The work begins with the taxonomy of cereals, especially of those species which are potential gene sources for wheat improvement. The text then goes on to cover the origin of wheat, breeding in connection with alien introgressions, and the problems of producing intergeneric hybrids and backcross derivatives. These problems can include crossability, sterility, and unequal chromosome transmission. The work then covers alien introgressions according to the related species used, as well as new results in the field of genomics of wild wheat relatives and introgressions.
Download or read book Precise Mapping of Hessian Fly and Stripe Rust Resistance Loci in Pacific Northwest Wheat Germplasm Triticum Aestivum L written by Esra Alwan and published by . This book was released on 2019 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hessian fly and stripe rust are major pests of spring wheat in the Pacific Northwest and cultivar resistance is a primary breeding goal. Hessian fly (HF) infestations continue to cause significant yield losses in spring wheat in the Pacific Northwest. In wheat, resistance to Hessian fly is usually controlled in a gene for gene manner, similar to other pathosystems. Hessian fly resistance genes in wheat have been failing as a result to the rapid evolutionary pace of the insect. Stripe rust (denoted by Yr) is a destructive foliar disease of wheat casing damage on an annual basis. Most of the Yr named resistance genes have been overcome as a result of the continuing emergence of new virulence races. Genetic resistance remains the most effective and economical approach to minimize yield losses and respond to pathogen evolution. A doubled haploid (DH) mapping population was generated from a cross between two elite spring wheat lines; 'WA8076', and 'HT080158LU'. The DH population was genotyped with 90K SNP markers using the Illumina Infinium platform. Phenotypic assessment was carried out on the DH population for both Hessian fly and stripe rust response. The genotyping efforts resulted in a total 15,236 polymorphic SNP markers used to establish a high-density genetic map. A single Hessian fly resistance gene (HFR) derived from 'WA8076' was detected on the distal region of chromosome 6BS, flanked by two SNP markers IWB71431 and IWB61175 at a distance of 2.6 cM. In addition, a total of 13 genes/QTL were found to be associated with stripe rust resistance. The adapted superior lines with Yr resistance will be directly incorporated in subsequent breeding efforts as a durable source of resistance. The closely linked SNP markers to the resistance loci, identified in this study, will provide an effective tool to accurately identify, select, and integrate the HF and Yr resistance genes into existing wheat cultivars. The highly dense SNP-based genetic map provides useful information for fine mapping and finding candidate genes underlying QTLs as well as marker-assisted breeding. Furthermore, a genome-wide association study (GWAS) we performed for both seedling and adult plant response in a diverse population of winter wheat germplasm. The population was genotyped with the 90K iSelect wheat single nucleotide polymorphism (SNP) array. Our GWAS study identified a total of 26 loci, comprising a range of existing and novel loci associated with stripe rust resistance. Resistance loci in the winter wheat germplasm can be exploited in the development of broadly-effective disease-resistant commercial wheat cultivars.
Download or read book Fine Mapping and Transfer of Leaf Rust Resistance Genes from Triticum Monococcuum to Cultivated Wheat written by Meenu Ghai and published by . This book was released on 2004 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Discovery Validation and Fine Mapping of Stripe Rust Resistance QTL in a Hexaploid Wheat Mapping Population written by Iago Zebediah Lowe and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The bane of wheat-based agricultural societies for millennia, the rust diseases continue to pose the single largest biotic threat to global wheat production despite more than a century of systematic scientific work on this important pathosystem. Recent breaches of numerous widely deployed sources of resistance have brought the wheat rusts once more to the center of global agricultural concerns and urge us to consider how, aided by new tools in molecular genetics and genomics, we may one day develop truly durable strategies of resistance to these sophisticated and evolving pathogens. Chapter 1 provides an historical overview of wheat rust resistance and argues that a new conceptual framework, one prioritizing the functional classification of quantitative resistance genes, is needed if the objective of developing deployable strategies of durable rust resistance is to be met. Chapter 2 details the identification and validation of stripe rust resistance QTL segregating in a hexaploid wheat mapping population. By focusing on sources of partial resistance, phenotyping under pressure from a broadly-virulent pathogen population in the field, characterizing the mapping population over multiple seasons, and validating the discovered QTL in independent populations, this study models the approach to rust resistance QTL identification and validation outlined in the first chapter. Chapter 3 presents the reasons for prioritizing continued investment in Yr48, a non-major resistance gene identified in the described mapping population. This discussion is followed by further phenotypic characterization of Yr48 and dissection of its validated QTL region, work which sets the stage for the construction of a physical map of the Yr48 region and the positional cloning of this novel source of resistance. The final section of this dissertation outlines the likely future research activities motivated by the results presented in the previous chapters. While it may be several years before Yr48 is cloned, this dissertation provides a solid justification and foundation for that work. And through its eventual identification and functional characterization, Yr48 promises to advance our understanding of the mechanisms of quantitative resistance to wheat stripe rust and thereby facilitate the long-term goal of engineering strategies of durable resistance to this historic agricultural pathogen.
Download or read book Discovery and Fine Mapping of a Locus for Adult Plant Stripe Rust Resistance in Hexaploid Wheat written by Nicolas Cobo and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cereal rusts are among the most destructive plant diseases, and have affected human food supply for millennia. Wheat stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is currently the most important of the three wheat rusts in California. Since the year 2000, the appearance of newer, more virulent and aggressive Pst races with tolerance to high temperatures has been associated with devastating epidemics worldwide and prompted the search for new sources of Pst resistance. In Chapter 1, four Pst resistance QTL effective against the new Pst races were identified using recombinant inbred lines (RILs) developed from a cross between the Argentinean varieties Klein Proteo and Klein Chajá. These QTL showed additive effects and they confer adequate levels of field resistance when combined. However, only QYr.ucw-1BL showed effective adult-plant resistance (APR) during the six years it was tested (P
Download or read book Wheat Rusts written by RA McIntosh and published by CSIRO PUBLISHING. This book was released on 1995-01-01 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although stem rust has been controlled by means of resistant cultivars, leaf and stripe rust continue as problems for many growing areas of the world. Wheat Rusts: An Atlas of Resistance Genes has been prepared by specialists from one of the leading international laboratories, and illustrates with colour photographs typical resistance phenotypes associated with most known genes for resistance to the three rust diseases of wheat. Relevant details for each gene include chromosome location, aspects of genetics and pathogen variation, the effects of environment on expression, origin, availability in genetic and breeding stocks, and use in agriculture. This atlas includes an introduction to host:pathogen genetics, methodologies for wheat rust research and breeding for resistance.
Download or read book Stripe Rust written by Xianming Chen and published by Springer. This book was released on 2017-07-11 with total page 723 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively introduces stripe rust disease, its development and its integral control. Covering the biology, genetics, genome, and functional genomics of the pathogen, it also discusses host and non-host resistance, their interactions and the epidemiology of the disease. It is intended for scientists, postgraduates and undergraduate studying stripe rust, plant pathology, crop breeding, crop protection and agricultural science, but is also a valuable reference book for consultants and administrators in agricultural businesses and education.
Download or read book Transfer of Resistance to Leaf Rust and Stem Rust from Triticum Tauschii to Hexaploid Wheat Cytogenetic Mapping of the Genes Involved and Restriction Mapping of Ribosomal DNA in T Tauschii written by Robert Lorne Innes and published by . This book was released on 1992 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mapping High Temperature Adult Plant Resistance to Stripe Rust Puccinia Striiformis in Spring Wheat Triticum Aestivum and Characterization of Their Interaction on a Molecular Level written by Taras Nazarov and published by . This book was released on 2017 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here we report the discovery of precise molecular marker for HTAP resistance locus in wheat cultivar Louise. Using Louise x Penawawa mapping population, coupled with data from survey sequences of wheat genome, linkage mapping and synteny analysis, we developed expressed, cleaved amplified polymorphic sequence (CAPS) marker LPHTAP2B on the short arm of wheat chromosome 2B. It perfectly segregates with the resistant phenotype and explains 62% of phenotypic variance based on disease severity, and 58% based on infection type.
Download or read book Genes for Host Resistance to Stripe Rust Puccinia Striiformis West in Spring Wheat Triticum Aestivum L written by Pamela Zwer and published by . This book was released on 1986 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Mapping of Stripe Rust Resistance and Freezing Tolerance in Winter Wheat Triticum Aestivum L written by Austin Joel Case and published by . This book was released on 2012 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization and Mapping of Four New Leaf Rust Resistance Genes Transferred to Common Wheat from Triticum Tauschii and T Monococcum written by Temam Hussien and published by . This book was released on 1996 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transfer of Rust Resistance Genes to Tetraploid and Hexaploid Wheat from Some Related Triticum Species microform written by Dapeng Bai and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1993 with total page 1688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Analysis of Leaf and Stripe Rust Resistance in the Spring Wheat Triticum Aestivum L Cross RL4452 AC Domain written by Kirby Nilsen and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tissue Culture and Genetic Transformation of Hexaploid Wheat for Stripe Rust Resistance written by Katrina G. Johnson and published by . This book was released on 2019 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheat stripe rust, caused by Puccinia striiformis f.sp tritici (Pst), can be a highly destructive disease, resulting in significant yield losses in the Pacific Northwest in epidemic years. Brundage, a top-quality, high-yielding, soft white winter wheat variety has been superseded in the last five years due to its susceptibility to the disease. Because of climate conditions in this region, infection by Pst is common. Therefore, introgression of one or more Pst resistance genes into regionally adapted genetic backgrounds is highly desirable. The goals of the present study were, firstly, to establish a tissue culture and genetic transformation system for two regionally adapted varieties: Brundage and UI Platinum. Secondly, to use genetic transformation to improve stripe rust resistance in Brundage. Six wheat varieties were initially tested for the tissue culture response of immature embryos in order to determine their regenerability into whole plants. The results indicated that there were two related groups in regard to regeneration; Fielder, Florida 303, and UI Platinum had similar but higher regeneration capacities than Florida 301, Florida 302, and Brundage. Fielder and UI Platinum are spring varieties, Florida 301 and 303 are facultative, and Florida 302 and Brundage are winter types. The shoot regeneration rate mean was highest for Fielder at 51.72% and lowest for Brundage at 9.90%. Five of aforementioned genotypes, excepting UI Platinum, were used in biolistic bombardment with the Yr28 gene, which is derived from Aegilops tauschii and confers all-stage resistance to stripe rust. There was no significant difference in the transformation rate of each genotype. The Fielder genotype had the highest mean transformation rate at 0.43% with a total of four transformed plants produced from 1,009 embryogenic calli, and Florida 301 had the lowest mean transformation rate at 0.13%, with one transformed plant produced from 952 embryogenic calli. However, the most successful replicate, KJ3, was completed with the Brundage genotype and had a transformation rate of 1.54% with three transformed plants produced from 195 embryogenic calli. Fifteen of the 33 replicates completed produced no plants whatsoever, and eight replicates produced plants, but those plants did not test positive for the for the Yr28 transgene. In total, 24 transformed plants were produced, 11 of which were from the Brundage genetic background, four from Fielder and Florida 302 respectively, three from Florida 301, and one from Florida 303. Ten of the T0 transformed plants showed distinctively resistant phenotypes, six of which were from the Brundage background. Lines carried to the T1 generation displayed genetic segregation for the Yr28 transgene. Some T1 plants were associated with stripe rust resistance. All wheat genotypes selected for transformation were confirmed to be susceptible to the currently prevalent Pst races. The insertion of Yr28, or other Pst-resistance genes, is highly desirable to impart disease resistance in wheat that is otherwise limited in this regard. The current study illustrated that unexploited genes from wild wheat relatives can be harnessed for wheat improvement.
