Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Quantitative Trait Loci Mapping Of Rust Resistance And Agronomic Traits In The Doubled Haploid Spring Wheat Population Hyayt12 10 X Gp146
Download Quantitative Trait Loci Mapping Of Rust Resistance And Agronomic Traits In The Doubled Haploid Spring Wheat Population Hyayt12 10 X Gp146 full books in PDF, epub, and Kindle. Read online Quantitative Trait Loci Mapping Of Rust Resistance And Agronomic Traits In The Doubled Haploid Spring Wheat Population Hyayt12 10 X Gp146 ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Quantitative Trait Loci Mapping of Rust Resistance and Agronomic Traits in the Doubled Haploid Spring Wheat Population 'HYAYT12-10' × 'GP146' by : Izabela L. Ciechanowska
Download or read book Quantitative Trait Loci Mapping of Rust Resistance and Agronomic Traits in the Doubled Haploid Spring Wheat Population 'HYAYT12-10' × 'GP146' written by Izabela L. Ciechanowska and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marker-assisted selection requires the identification of molecular markers associated with major genes and quantitative trait loci (QTL) using linkage analysis. In this study, we used 167 doubled haploid (DH) lines derived from two unregistered spring wheat (Triticum aestivum L.) parental lines that belong to the Canada Western Special Purpose (CWSP) class to map QTLs associated with five traits using inclusive composite interval mapping (ICIM). Using ICIM, least square means phenotype data across 3-4 environments, and a genetic map of 2,676 SNPs out of the wheat 90K SNP array, we identified ten QTLs associated with maturity (4A and 5B), plant lodging (4B, 5A, 5D, and 7D), grain yield (2D), leaf rust (4A) and stem rust (1A and 2B). Each QTL individually accounted for 6.0-22.3% of the phenotypic variance and together accounted for 8.6-38.2% of each trait. QTLs identified for rusts using ICIM had a minor effect (6.0-9.0%) or a major effect (22.3%). Our major effect QTL at 22.3% was discovered on chromosome 2B and contributed to stem rust response. Its physical location has been associated with disease response in previous studies. Results from this study provide additional valuable information to wheat researchers, in particular that the area on chromosome 2B should be considered for future analyses.
Book Synopsis Genetic Mapping of Quantitative Trait Loci for Slow-rusting Traits in Wheat by : Yue Lu
Download or read book Genetic Mapping of Quantitative Trait Loci for Slow-rusting Traits in Wheat written by Yue Lu and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheat leaf rust, caused by Puccinia triticina, is an important fungal disease worldwide. Growing resistant cultivars is an effective practice to reduce the losses caused by the disease, and using slow-rusting resistance genes can improve the durability of rust resistance in the cultivars. CI13227 is a winter wheat line that shows a high level of slow-rusting resistance to leaf rust and has been studied extensively. In this research, two recombinant inbreed line (RIL) populations derived from CI13227 x Suwon (104 RILs) and CI13227 x Everest (184 RILs) and one doubled haploid (DH) population derived from CI13227 x Lakin with 181 lines were used to identify quantitative trait loci (QTLs) for slow leaf rusting resistance. Each population and its parents were evaluated for slow-rusting traits in two greenhouse experiments. A selected set of 384 simple sequence repeat markers (SSRs), single nucleotide polymorphism markers (SNPs) derived from genotyping-by-sequencing (GBS-SNPs) or 90K-SNP chip (90K-SNPs) were analyzed in the three populations. Six QTLs for slow-rusting resistance, QLr.hwwgru-2DS, QLr.hwwgru-7BL, QLr.hwwgru-7AL, QLr.hwwgru-3B_1, QLr.hwwgru-3B_2, and QLr.hwwgru-1D were detected in the three populations with three stable QTLs, QLr.hwwgru-2DS, QLr.hwwgru-7BL and QLr.hwwgru-7AL. These were detected and validated by Kompetitive Allele-Specific PCR (KASP) markers converted from GBS-SNPs and 90K-SNPs in at least two populations. Another three QTLs were detected only in a single population, and either showed a minor effect or came from the susceptible parents. The KASP markers tightly linked to QLr.hwwgru-2DS (IWB34642, IWB8545 and GBS_snpj2228), QLr.hwwgru-7BL (GBS_snp1637 and IWB24039) and QLr.hwwgru-7AL (IWB73053 and IWB42182) are ready to be used in marker-assisted selection (MAS) to transfer these QTLs into wheat varieties to improve slow-rusting resistance in wheat.
Book Synopsis Characterization of Stripe Rust Resistance and Yield-related Traits in an 'Overley' X 'Overland' Population by : Wardah K. Mustahsan
Download or read book Characterization of Stripe Rust Resistance and Yield-related Traits in an 'Overley' X 'Overland' Population written by Wardah K. Mustahsan and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheat is a vital cereal crop, providing 20 % of the daily nutritional requirements for consumers worldwide. Although there has been a substantial increase in production and yield gains, food demands will still be on the rise in future decades, and wheat yields must continue to increase rapidly to meet these demands. Grain yield can be inhibited by biotic factors (pathogens), which require the development of resistant varieties against pathogens. Stripe (yellow) rust produces massive yield losses in wheat production, and ample resistance against stripe rust is achieved by pyramiding multiple resistant genes together. Yield also can be improved by characterizing the underlying mechanisms that define yield and yield-related traits. We used breeding technology tools to dissect the genetic architecture of yield-related traits, yield, and stripe rust resistance to identify genomic regions that can improve these traits in wheat germplasm and broaden the genetic resources available for breeders to develop robust breeding germplasm that can improve the profitability and resilience of wheat production. Stripe (yellow) rust, caused by Puccinia striiformis (Pst), is a devastating disease of wheat worldwide. In commercial production, stripe rust reduces forage yield, grain yield and grain quality. Yield losses caused by stripe rust range from 10% to 70%. This study was conducted using two different wheat reference genomes (IWGSC v2.1('Chinese Spring') and 'Jagger') to identify quantitative trait loci (QTL) associated with adult plant field resistance to stripe rust in the hard winter wheat RIL population, 'Overley' x 'Overland' to provide breeders with identified genomic regions associated with quantitative field resistance. Our QTL analysis identified genomic regions on 2AS (2N[superscript v]S translocation), 2BS, 2BL, and 2DL using two different mapping methods (Inclusive Composite Interval Mapping and Multi-Environmental Trial Analysis) that were associated with stripe rust resistance for both infection type and severity using genetic maps from both genomes. There were no meaningful differences in interpreting the data from the two maps. Overley contributed the resistance alleles at the 2AS and 2BL QTLs. Overland contributed the resistance alleles at the 2BS and 2DL QTLs. The 2DL QTL (QYr.hwwg-2D) will be further refined due its environmental stability for resistance. We designed PCR-based SNP marker assays to efficiently identify these genomic regions in breeding populations. Yield improvement can be facilitated by a deeper understanding of the underlying infrastructure of components that determine grain yield. We performed a QTL analysis on the population Overley x Overland, to identify genomic regions in our population can explain the variation in yield and its components in field trials using the two different reference maps. We identified major QTLs in both reference maps for yield (3BL), single kernel weight (4AL), plant height (6AS), grains per spike (4AL), thousand grain weight (4AL), and physiological maturity (2BS). The Jagger map identified more QTLs (40 QTLs) than the IWGSCv2.1 map (30 QTLs). The future direction of these studies will be marker development to utilize these QTLs in yield-improvement breeding programs.
Book Synopsis QTL Mapping of Stem Rust Resistance Loci in Durum Wheat Populations by : Shitaye Homma Megerssa
Download or read book QTL Mapping of Stem Rust Resistance Loci in Durum Wheat Populations written by Shitaye Homma Megerssa and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stem rust caused by Puccinia graminis f. sp. tritici Eriks. & Henn is the most destructive disease of durum and common wheat. The main focus of this study is to identify loci associated with stem rust resistance in durum wheat using association mapping and linkage mapping. A panel of 283 lines and 224 recombinant inbred lines (RILs) from a cross between 'Reichenbachii' and 'DAKIYE' developed by the durum wheat breeding program of the International Maize and Wheat Improvement Center (CIMMYT) were used for the study. The panel was evaluated against races TTKSK, TKTTF, JRCQC and TTRTF at the seedling stage and TKTTF and JRCQC in the field in Ethiopia from 2018 to 2019 for two seasons. The same panel was evaluated against bulk of multiple stem rust races prevalent in Ethiopia and Kenya from 2018 to 2019 in five environments. Genome-wide association study (GWAS) was conducted using 26,439 single nucleotide polymorphism (SNP) markers for seedling response (280 lines) and field response (283 lines) to stem rust. The RILs along with the two parents were evaluated for response to bulk of multiple stem rust races in Ethiopia and Kenya for two seasons from 2019 to 2020. Linkage analyses were conducted using 843 SNP markers for 175 lines. For GWAS of seedling response, a mixed linear model (MLM) identified 17 quantitative trait loci (QTL) of which eight were putatively novel while FarmCPU identified 20 QTL and 12 were likely novel. For field resistance to races TKTTF and JRCQC, MLM detected 19 QTL of which 12 were likely novel while FarmCPU detected 16 QTL and seven were putatively novel. For resistance to multiple Pgt races in East Africa, 160 significant marker-trait associations (MTAs) grouped into 42 QTL were identified using MLM and FarmCPU and 21 QTL were likely novel. From previously reported Sr genes, the regions of Sr7a, Sr8a, Sr8155B1, Sr11, Sr12, alleles of Sr13, Sr17, Sr22/Sr25, and Sr49 were identified. For the biparental population, composite interval mapping (CIM) identified three QTL on chromosomes 3B (QSr.cnl-3B), 4B (QSr.cnl-4B) and 7B (QSr.cnl-7B). These three QTL contributed by the resistant parent explained 4.7% to 15.3% of the phenotypic variation and all match previously reported loci. Lines with multiple-race stem rust resistance can be used as parents in durum wheat resistance breeding to stem rust and markers identified in the GWAS can be used in marker-assisted selection (MAS) once validated in a different population. Further study on the validation of allele specific markers and allelism tests in the Sr13 region of chromosome 6A is needed. Future evaluation of large numbers of durum wheat lines and searching for durable adult plant resistance gene is crucial in resistance breeding of durum wheat.
Book Synopsis QTL Analysis of End-use Quality and Stripe Rust Resistance Traits in a Double Haploid Soft White Wheat Population by : Carmen Johanne Barkley
Download or read book QTL Analysis of End-use Quality and Stripe Rust Resistance Traits in a Double Haploid Soft White Wheat Population written by Carmen Johanne Barkley and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheat (Triticum spp.) is a crop of major economic and dietary importance. In the Pacific Northwest region of the United States, soft white wheat is the primary class of wheat grown and is an important export product for the region. Soft white wheat flour is especially important in producing products such as cookies, crackers, pancakes, noodles and pastry products. The goal of this project was to map quantitative trait loci (QTL) for end-use quality and stripe rust (Puccinia striiformis f. sp. tritici) resistance in a double haploid mapping population derived from a cross between a soft white winter club wheat, ‘Cara’, and a soft white winter lax wheat, ‘Xerpha’. The mapping population of 126 individuals was grown across 12 environments from 2013 to 2017 and rated for stripe rust resistance. In a separate experiment, it was grown in 16 different locations from 2013 to 2016 and phenotyped for 16 end-use quality traits. A linkage map of 23 linkage groups was constructed for the population using 1282 genotyping-by-sequencing (GBS) and KASP markers. QTL analysis revealed 35 significant QTL for stripe rust resistance. Two of the most interesting markers in the stripe rust resistance analysis were IWB38687 and A2927, which were each associated with three separate QTL. Analysis of the end-use quality trait data identified 22 significant QTL. Some of the most significant QTL identified for end-use quality traits had LOD scores well over five and explained over 15% of the variance in the trait they were associated with. Some of the markers identified in this study could be good targets for marker assisted selection in PNW wheat breeding programs, especially because the parents of our mapping population are commonly used in breeding programs in the PNW.
Book Synopsis Identification of Quantitative Trait Loci and Molecular Markers for Disease, Insent and Agronomic Traits in Spring Wheat (Triticum Aestivum L.) by : Arron Hyrum Carter
Download or read book Identification of Quantitative Trait Loci and Molecular Markers for Disease, Insent and Agronomic Traits in Spring Wheat (Triticum Aestivum L.) written by Arron Hyrum Carter and published by . This book was released on 2009 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Validation of Quantitative Trait Loci for Morphological and Agronomic Traits in Spring Wheat by : Stella Salvo
Download or read book Validation of Quantitative Trait Loci for Morphological and Agronomic Traits in Spring Wheat written by Stella Salvo and published by . This book was released on 2004 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantitative Trait Locus Mapping of Agronomic, Physiological, and End-use Quality Traits of Common Wheat (T. Aestivum) by : Junli Zhang (Doctoral student)
Download or read book Quantitative Trait Locus Mapping of Agronomic, Physiological, and End-use Quality Traits of Common Wheat (T. Aestivum) written by Junli Zhang (Doctoral student) and published by . This book was released on 2013 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Grain yield (GY) is always the first priority in wheat (Triticum aestivum L.) breeding; however, progress in improvement of this trait is hampered due to quantitative inheritance, low heritability, and confounding environmental effects. Thanks to the advancements of high throughput genotyping and phenotyping technologies, both molecular markers and physiological traits are now promising indirect selection tools in breeding for this trait and other traits. Besides grain yield, grain quality is another important respect in wheat breeding, and one of the quality traits is the Hagberg falling number (FN), which is commonly used in grain grading. The FN test has a genetic component but is also strongly influenced by environmental conditions during the reproductive growth stage, including excessive moisture, extreme temperature, and biotic and abiotic stresses. The objective of the current studies was to identify potential genomic regions and molecular markers that influence GY, three important physiological traits (canopy temperature, CT; chlorophyll content index, CCI; flag leaf senescence, FLS) that could impact grain yield during heat and moisture stress, and FN by QTL mapping approaches. A winter wheat population of 159 recombinant inbred lines (RILs) from the cross of ID0444 and Rio Blanco were used to map QTL for GY, CT, CCI and FLS, and a total of 110 hard white spring (HWS) wheat accessions from the National Small Grain Collection (NSGC) were used in genome-wide association mapping of FN. GY was evaluated under three field conditions, rainfed, terminal drought (water stress applied after anthesis), and fully irrigated, with a total of six location-year environments. QTL mapping was conducted for main effect (G) of GY, and the genotype x environment interaction (GEI) effect of GY. A total of 17 QTL were associated with G and 13 QTL associated with GEI, and nine of 13 QTL for GEI were mapped in the flanking chromosomal regions of QTL for GEI. One QTL, Q.Gy.ui-1B.2 found on chromosome 1B, was associated with GY in all six individual environments. Significant QTL x environment interaction (QEI), QTL x QTL interaction (QQI) and QTL x QTL x environment (QQEI) were also identified. The present study showed that the QEI and QQI were as important as the QTL main effect of GY, and they should be taken into consideration in future QTL studies and marker-assisted selection (MAS). The three physiological traits, CT, CCI and FLS, which have been reported to be closely related to grain yield of wheat in diverse environments, were evaluated in two terminal drought and one rainfed environments in southeastern Idaho. Correlation results showed that CT and FLS were highly correlated with GY but the relationship between CCI and GY varied among the three environments. FLS was closely related to heading date (HD) and its effect on grain yield might be determined by HD in the RIL population used in the study. Stepwise multiple regression showed that CT and FLS could predict grain yield effectively and could be used as indirect selection criteria in wheat breeding. A total of 27 main effect QTL (M-QTL) were identified on 12 chromosomes, explaining 5 to 14% of phenotypic variation. Seven epistatic QTL (E-QTL) were identified for FLS and CCI and these could explain 9-25% of the phenotypic variation, but most of them did not have a main effect. Most of the QTL were reported for the first time. FN tests were conducted using grain flour samples from the 110 HWS wheat accessions grown in five environments. A total of 1,740 SNP markers were used to detect SNP-FN associations using both general linear model (GLM) and mixed linear model (MLM). A total of 13 QTL located in nine chromosomal regions were identified in both GLM and MLM approaches. These new QTL have the potential to increase the selection efficiency for wheat breeding, and can be further explored to identify candidate genes.
Book Synopsis Quantitative Trait Loci for Agronomic and Quality Traits in Two Advanced Backcross Populations of Winter Wheat by : Antje Kunert
Download or read book Quantitative Trait Loci for Agronomic and Quality Traits in Two Advanced Backcross Populations of Winter Wheat written by Antje Kunert and published by . This book was released on 2007 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mapping Quantitative Trait Loci for Fusarium Head Blight Resistance in the U.S. Winter Wheat by : Abdulrahman Hashimi
Download or read book Mapping Quantitative Trait Loci for Fusarium Head Blight Resistance in the U.S. Winter Wheat written by Abdulrahman Hashimi and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fusarium head blight (FHB) is one of the devastating wheat diseases worldwide. It reduces not only yield, but also grain quality due to mycotoxins produced by the pathogen Fusarium graminearum. To identify consistent quantitative trait loci (QTLs) for FHB resistance in two US winter wheat 'CI13227' and 'Lyman', we genotyped a double haploid (DH) population from '' x 'CI13227' X 'Lakin' using Illumina wheat 90K single nucleotide polymorphism (SNP) chips and two recombinant inbred line (RIL) populations from 'Lyman'x 'Overley' and 'Lyman'x 'CI13227' using genotyping-by-sequencing (GBS) and evaluated the three populations for FHB type II resistance in greenhouse and field experiments. QTL mapping identified four QTLs on chromosomes 4BS, 5AL, 2DS and 7A in the 'CI13227' x 'Lakin' population, which explained 8-17% of the phenotypic variation in different experiments. The QTL on 4BS from CI13227 showed the largest effect among QTLs detected in the 'CI13227' x 'Lakin' population and were consistently detected in three experiments. 'CI13227' contributed the resistance alleles at QTLs on 2DS and 7A, whereas 'Lakin' contributed the resistance allele at 5AL QTL. The 7A QTL was detected in only one experiment. The QTLs on the chromosomes 4B and 2D showed a high correlation with plant height, suggesting a linked genes or pleiotropic effect of these QTLs. In the 'Lyman'/'Overley' population, six QTLs were located on the chromosomes 1A, 2A, 3A, 1B, 2B and 4B, and explained 5.5 -21% of the phenotypic variations for type II resistance. The QTL on 3A from 'Lyman' showed the largest effects and detected in two greenhouses experiments. Significant correlation was not detected between the PSS and plant height in this population. In the 'Lyman'/'CI13227' population, four QTLs were detected with two QTLs on chromosomes 1A and 7A from 'CI13227' and chromosomes 2B and 3A from 'Lyman' and QTLs on 7A from 'CI13227' and 2B and 3A from 'Lyman' confirmed the results from the previous two populations. Markers for the repeatable QTLs were converted into Kompetitive allele specific PCR (KASP) markers for marker-assisted breeding to pyramid these QTLs in U.S. winter wheat.
Book Synopsis QTL Mapping of Stripe Rust Resistance and End-use Quality in Winter Wheat (Triticum Aestivum L.) by : Emily Frances Klarquist
Download or read book QTL Mapping of Stripe Rust Resistance and End-use Quality in Winter Wheat (Triticum Aestivum L.) written by Emily Frances Klarquist and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Molecular Characterization of Durable Yellow and Leaf Rust Resistance in Two Wheat Populations by : Bhoja Basnet
Download or read book Molecular Characterization of Durable Yellow and Leaf Rust Resistance in Two Wheat Populations written by Bhoja Basnet and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheat (Triticum aestivum L.) is one of the most important food crops, comprising the largest source of daily calorie and protein intake of human beings worldwide. Among the several diseases of wheat, Yellow Rust (YR; caused by Puccinia striiformis Westend. f. sp. tritici) and Leaf Rust (LR; caused by Puccinia triticina Erikss. & Henn.) have always been major production constraints since the domestication of wheat. For the last few decades, scientists have invested large efforts to identify, characterize and utilize Adult Plant Resistance (APR), a.k.a. slow rusting resistance, in wheat germplasm to promote durability of resistance against rust. The objectives of this study were to 1) understand the genetics of APR to YR and/or LR present in two potential wheat lines 'Quaiu 3' and 'TAM 111', and 2) map the putative Quantitative Trait Loci (QTL) associated with YR and LR resistance using DNA-based molecular markers. Two Recombinant Inbred Line (RIL) populations were subjected to YR and LR disease evaluation experiments in multiple years and locations. Visual evaluation of Disease severity (DS) and Infection Type (IT) score in both RIL populations showed that APR to YR and LR were highly heritable quantitative traits with significant correlation among experiments. In spring wheat population, composite interval mapping consistently detected four and three large effect QTL for YR and LR resistance, respectively. Among those QTLs, 1B, 3B and 1D QTL were found to be associated with previously characterized genes Lr46/Yr29, Sr2/Yr30 and Lr42, respectively. However, QTLs QYr.tam-3D and QYr.tam-2D were potentially novel. The largest YR QTL QYr.tam-2D was located on long arm of chromosome 2D explaining about 48 to 61% of the total phenotypic variation. Similarly, in winter wheat population, apart from three environment-specific QTL on chromosomes 1A, 2A and 7D, the QTL on chromosome 2B (QYr.tam-2B) was found to express consistently in multiple environments explaining about 23 to 63% of total phenotypic variation. This study has further elucidated the inheritance mechanism of APR to YR and LR present in two different wheat lines, Quaiu 3 and TAM 111, and resulted in the successful mapping and characterization of the genetic loci associated with corresponding disease resistance traits. These findings should be very useful to isolate the novel APR genes and/or directly use in wheat breeding programs to enhance durable rust resistance in diverse wheat germplasm and cultivars in the future.
Book Synopsis Quantitative Trait Loci and Genomewide Association Mapping in Western Canadian Spring Wheat (Triticum Aestivum L.) by : Hua Chen
Download or read book Quantitative Trait Loci and Genomewide Association Mapping in Western Canadian Spring Wheat (Triticum Aestivum L.) written by Hua Chen and published by . This book was released on 2016 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Early maturity, grain yield and grain protein content are some of the important traits in western Canadian wheat breeding programs. A series of experiments were conducted to explore the genetic basis of days to heading, and maturity, plant height, grain protein, grain yield and related traits. In a spring wheat population of 187 recombinant inbred lines genotyped with 341 Diversity Array Technology (DArT) polymorphic markers, a total of 21 quantitative trait loci (QTLs) were identified for all phenotypic traits recorded, except plant height and grain protein content. Two earliness per se QTLs were mapped on chromosomes 1A (QEps.dms-1A) and 4A (QEps.dms-4A) in all three growing seasons, contributing 15-27% and 8-10%, respectively, to the total genetic variation in days to maturity. The two earliness QTLs and Vrn-B1 exhibited additive interaction. In the same population, lines carrying the resistant allele of Lr34/Yr18 were taller, matured earlier, yielded less grain with lower test weights than lines without Lr34/Yr18. Lines with Lr34/Yr18 also exhibited lower leaf and stripe rust infection than lines with the susceptible allele. The failure to combine Lr34/Yr18 with high yield, protein, and SDS sedimentation suggested single seed descent or doubled haploid populations for the combined selection of multiple quantitatively inherited traits, and simply one molecular marker, would require population sizes in excess of at least 500 to have any possibility of selection success. Genetic diversity analysis for earliness related and plant height reducing genes in 82 spring wheat cultivars registered in western Canada through eight diagnostic DNA markers suggested breeding efforts in western Canada have resulted in the incorporation of vernalization and photoperiod insensitive and height reducing genes in modern cultivars to promote early maturity, to make use of off-season nurseries in other parts of the world and to improve lodging tolerance. Using genome-wide association mapping (GWAS). we identified a total of 152 significant marker-trait associations; however, there were only 18 genomic regions that consisted of clusters of 3 to 20 significant single nucleotide polymorphisms (SNPs) across 12 chromosomes, including two regions each for grain yield, test weight and protein content, six regions for plant height and six other coincident regions that were associated with two or three traits. The genomic region associated with plant height on chromosome 4B showed high linkage disequilibrium (r2 > 0.80) with the semi-dwarfing gene Rht-B1. Results of these studies suggest that besides the widely used semi-dwarf and early maturity related genes, there is a wide spectrum of loci available that could be used for modulating plant height, days to maturity, grain yield and grain protein content in western Canadian wheat germplasm.
Book Synopsis Quantitative Trait Locus Evaluation for Agronomic and Morphological Traits in a Spring Wheat Population by : Joshua Donald Butler
Download or read book Quantitative Trait Locus Evaluation for Agronomic and Morphological Traits in a Spring Wheat Population written by Joshua Donald Butler and published by . This book was released on 2002 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inheritance and Quantitative Trait Loci Analysis of Leaf Rust Resistance in Wheat by : Julia Xiuling Zhang
Download or read book Inheritance and Quantitative Trait Loci Analysis of Leaf Rust Resistance in Wheat written by Julia Xiuling Zhang and published by . This book was released on 2007 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mapping Quantitative Trait Loci for Agronomic and Quality Factors in Wheat by :
Download or read book Mapping Quantitative Trait Loci for Agronomic and Quality Factors in Wheat written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impact of the D Genome and Quantitative Trait Loci on Quantitative Traits in a Spring Bread Wheat by Spring Durum Wheat Cross by : Jay Robert Kalous
Download or read book Impact of the D Genome and Quantitative Trait Loci on Quantitative Traits in a Spring Bread Wheat by Spring Durum Wheat Cross written by Jay Robert Kalous and published by . This book was released on 2014 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Desirable agronomic traits are similar for common hexaploid (6X) bread wheat (Triticum aestivum, 2n = 6x = 42, genome, AABBDD) and tetraploid (4X) durum wheat (T. turgidum durum, 2n = 4x = 28, genome, AABB). However, bread and durum wheat are genetically isolated from each other due to an unequal number of genomes that cause sterility when crossed. Previous work allowed identification of a 6X and 4X parent that when crossed resulted in a large number of recombinant progeny at both ploidy levels. In this study, interspecific recombinant inbred line populations at both 4X and 6X ploidy with 88 and 117 individuals, respectively, were developed from a cross between Choteau spring wheat (6X) and Mountrail durum wheat (4X). Lines within each population contained a mixture of alleles from each parent for loci in the A and B genomes. The presence of the D genome in the 6X population resulted in increased yield, tiller number, and seed size. The D genome also resulted in a decrease in stem solidness, lower test weight and fewer seed per spike. Similar results were found with a second RIL population containing 152 lines from 18 additional 6X by 4X crosses. Several additional QTL for agronomic and quality traits were identified in both the 4X and 6X populations. Positive durum alleles increasing kernel weight in hexaploids, on chromosomes 3B and 7A may be useful for introgression by bread wheat breeders.
