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Identification Of Quantitative Trait Loci In Crosses Of Elite Inbred Lines Of Maize Using Isozyme Loci
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Book Synopsis Identification of Quantitative Trait Loci in Crosses of Elite Inbred Lines of Maize Using Isozyme Loci by : Brenda Sue Bateman
Download or read book Identification of Quantitative Trait Loci in Crosses of Elite Inbred Lines of Maize Using Isozyme Loci written by Brenda Sue Bateman and published by . This book was released on 1988 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of Quantitative Trait Loci in Crosses of Elite Inbred Linea of Maize Using Isoxyme Loci by : Brenda Sue Bateman
Download or read book Identification of Quantitative Trait Loci in Crosses of Elite Inbred Linea of Maize Using Isoxyme Loci written by Brenda Sue Bateman and published by . This book was released on 1988 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genetic Analysis of Quantitative Trait Loci with Inbred and Hybrid Progeny of Maize by : David Frederick Austin
Download or read book Genetic Analysis of Quantitative Trait Loci with Inbred and Hybrid Progeny of Maize written by David Frederick Austin and published by . This book was released on 1997 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first objective of this study was to compare quantitative trait loci (QTL) detection in two climatically diverse environments in a population of F6:-- lines of an elite maize (Zea mays L.) single-cross. The second objective was to detect QTL for general (GCA) and specific (SCA) combining ability effects in hybrid progeny of F2:3 and F6: lines from the same population. Evaluations of both inbred per se and hybrid progeny from the same population enabled comparisons between QTL controlling the two progeny types. The results from the F6:-- inbred progeny evaluations suggest that QTL detection can be greatly affected by environmental conditions with only 17% (grain yield traits) and 35% (morphological traits) of the QTL detected among the stress and nonstress environments being detected in both environments. The mean environment was effective in detecting 68% (morphological traits) and 54% (grain yield traits) of the QTL detected in either of the individual environments.
Book Synopsis Quantitative Trait Loci by : Nicola J. Camp
Download or read book Quantitative Trait Loci written by Nicola J. Camp and published by Springer Science & Business Media. This book was released on 2008-02-03 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Quantitative Trait Loci: Methods and Protocols, a panel of highly experienced statistical geneticists demonstrate in a step-by-step fashion how to successfully analyze quantitative trait data using a variety of methods and software for the detection and fine mapping of quantitative trait loci (QTL). Writing for the nonmathematician, these experts guide the investigator from the design stage of a project onwards, providing detailed explanations of how best to proceed with each specific analysis, to find and use appropriate software, and to interpret results. Worked examples, citations to key papers, and variations in method ease the way to understanding and successful studies. Among the cutting-edge techniques presented are QTDT methods, variance components methods, and the Markov Chain Monte Carlo method for joint linkage and segregation analysis.
Book Synopsis Identification of Quantitative Trait Loci (QTL) for Gray Leaf Spot Resistance, Maturity, and Grain Yield in a Semi-tropical Recombinant Inbred Population of Maize by :
Download or read book Identification of Quantitative Trait Loci (QTL) for Gray Leaf Spot Resistance, Maturity, and Grain Yield in a Semi-tropical Recombinant Inbred Population of Maize written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Identification of QTL can aide in future breeding objectives by allowing breeders either to improve a line through targeted introgressions or assist in forward breeding strategies. Such analyses may be particularly helpful in integrating exotic germplasm into a breeding program. The percentage of tropical maize germplasm grown in U.S. farmers' fields is almost nonexistent. Tropical germplasm in maize (Zea mays L.) is a valuable resource to decrease the dependence upon a limited genetic base currently used to produce commercial hybrids, extend selection limits for grain yield, and to provide an insurance function against emerging biotic and abiotic stresses. Results of research presented in this dissertation support these recommendations. Experiments were conducted to evaluate 143 S4:5 recombinant inbred lines (RILs) resulting from a cross between NC300, an all-tropical, temperate adapted line, and B104, a stiff stalk line. The 143 RILs were topcrossed to the Lancaster tester FR615xFR697 and randomly subdivided into two sets. The two sets were evaluated for resistance to GLS disease and yielding ability in three and eight North Carolina environments, respectively. Spatial trends were examined in the GLS trials. Significant (P d".01) trend effects were fitted in five of the six set-by-environment combinations, which led to improved analyses within and across environments for both sets. Ninety-three and eighty-two percent of the RILs in topcrosses (RILT) were significantly (P = 0.05) more resistant to GLS when compared to the mean of the commercial checks for set 1 and 2, respectively. Twenty-one RILs from both sets did not differ significantly (P = 0.05) for grain yield when compared to the mean of the commercial checks. RIL 2070 yielded significantly (P = 0.05) higher when compared to one commercial check, HC33. TR7322. RIL 1991 was rated the most resistant entry in set 1 and also did not differ from the mean of the commercial checks for grain yield. The RILs we.
Book Synopsis Marker-Qtl Associations: Comparisons of Genetic Background Effects in Maize by :
Download or read book Marker-Qtl Associations: Comparisons of Genetic Background Effects in Maize written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of Major Quantitative Trait Loci for Grain Quality Traits in Tropical Maize Recombinant Inbred Lines by : Haci-Murat Arpat
Download or read book Identification of Major Quantitative Trait Loci for Grain Quality Traits in Tropical Maize Recombinant Inbred Lines written by Haci-Murat Arpat and published by . This book was released on 1996 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identifying Quantitative Trait Loci in Experimental Crosses by : Karl William Broman
Download or read book Identifying Quantitative Trait Loci in Experimental Crosses written by Karl William Broman and published by . This book was released on 1997 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantitative Trait Loci Analysis in Animals by : Joel Ira Weller
Download or read book Quantitative Trait Loci Analysis in Animals written by Joel Ira Weller and published by CABI. This book was released on 2009 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantitative Trait Loci (QTL) is a topic of major agricultural significance for efficient livestock production. This book covers various statistical methods that have been used or proposed for detection and analysis of QTL and marker-and gene-assisted selection in animal genetics and breeding.
Book Synopsis Quantitative Trait Loci Analysis to Identify Modifiers Genes of the Gene Opaque2 in Maize Endosperm by : Libardo Andres Gutierrez Rojas
Download or read book Quantitative Trait Loci Analysis to Identify Modifiers Genes of the Gene Opaque2 in Maize Endosperm written by Libardo Andres Gutierrez Rojas and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The protein quality of maize can be improved by replacing normal Opaque2 alleles with non-functional recessive alleles opaque2 (o2). The allele o2 produces a severe phenotype with soft endosperm enhancing its protein quality but decreasing its agronomical value. Plant breeders have restored a desirable ratio of hard to soft endosperm in o2 germplasm known as Quality Protein Maize (QPM). Neither the mechanism nor the genetic components by which the modification of the endosperm in QPM lines occurs are well understood. To increase the understanding of the genetics of endosperm modification, a population of 146 recombinant inbred lines derived from a cross between the o2 inbred line B73o2 and the QPM inbred line CML161 was evaluated in two Texas locations from 2004 to 2006. Four traits related to endosperm texture were measured and showed significant effect of the inbred lines, high heritability estimates and high genetic correlations. Relative content of the essential amino acids lysine, tryptophan and methionine were measured and showed significant effects of the lines and considerable high genetic correlations and heritabilities. Negative correlation was observed between endosperm texture traits and amino acid content. Quantitative trait loci (QTL) were mapped for traits related to the modification of endosperm texture and the content of lysine, tryptophan and methionine. QTLs clusters for endosperm texture traits were detected on chromosomes 3, 5, 6 and 8 explaining 62-68% of the variation. QTLs clusters for amino acid contents were located on chromosomes 7 and 8 that explained up to 39% of the observed variation. The product of the O2 gene is a transcription factor that affects the expression of a number of endosperm genes. A group of 29 endosperm genes associated with the O2 activity were evaluated in developing endosperm of the recombinant inbred lines. Genomic regions controlling gene transcript abundance in developing endosperm were identified by expression QTL mapping. Evidence is presented of QTL hot spots that segregate in association with endosperm texture modification or amino acid contents and are associated with the regulation of the expression of a group of endosperm genes.
Book Synopsis Identification of Alleles from Exotic Maize for Maize Improvement Using Advanced Backcross QTL Analysis by : Huver Posada-Suarez
Download or read book Identification of Alleles from Exotic Maize for Maize Improvement Using Advanced Backcross QTL Analysis written by Huver Posada-Suarez and published by . This book was released on 2000 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of Quantitative Trait Loci Im Maize by : Michael Richard Kerns
Download or read book Identification of Quantitative Trait Loci Im Maize written by Michael Richard Kerns and published by . This book was released on 1998 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biochemical Aspects of Crop Improvement by : K. R. Khanna
Download or read book Biochemical Aspects of Crop Improvement written by K. R. Khanna and published by CRC Press. This book was released on 1990-12-19 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive review at the biochemical and molecular level of the processes and techniques that contribute to crop improvement. General topics include a historical perspective of the advancements in crop improvement; cultivar systematics and biochemical and molecular markers in crop improvement programs; the genetics of physiological and biochemical processes affecting crop yield; the genetics of photosynthesis, chloroplast, relevant enzymes, and mutations; osmoregulation/adjustment and the production of protective compounds in relation to drought tolerance; and the biochemistry of disease resistance, including elicitors, defense response genes, their role in the production of phytoalexins and other strategies against pathogens. Other topics include quality breeding (e.g., molecular gene structure, changing individual amino acids, enhancing nutritive value of proteins) and biotechnology/genetic engineering. Geneticists, biochemists, botanists, agricultural specialists and others involved in crop improvement and breeding should consider this volume essential reading.
Book Synopsis Identification of Quantitative Trait Loci Associated with Flowering, Vegetative Traits and Photoperiod Response in Maize (Zea Mays L.) by : Rkia Moutiq
Download or read book Identification of Quantitative Trait Loci Associated with Flowering, Vegetative Traits and Photoperiod Response in Maize (Zea Mays L.) written by Rkia Moutiq and published by . This book was released on 2002 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: In general, maize, especially germplasm from the tropics and subtropics, is sensitive to photoperiod. This sensitivity hindered the exchange of germplasm between latitudes. To identify quantitative trait loci (QTL) associated with the response to photoperiod, a population of 236 F3 lines produced from a cross between a photoperiod-sensitive line CML9 and insensitive inbred A632Ht was used. These F3 lines were evaluated in three long and three short-day environments, in adjacent fields using artificial light, and in fields located in different latitudes, Mexico and Iowa. Days from sowing to anthesis (DTA), final leaf number (FLN) and plant height (PH) were measured. For each of these traits, photoperiod response (PPR) was estimated as the difference between the trait in long- and short-days divided by the trait in short-days. Composite interval mapping was used to detect QTL for each trait and comparison of locations of QTL detected in different daylengths for the same trait and for different traits were examined. A unique set of QTL was detected for each photoperiod and for each trait. One QTL for DTA, three QTL for FLN and four QTL for PH were detected in the same genetic regions in both daylengths. Five QTL for DTA, four QTL for FLN and three QTL for PH were detected only in long-day environments. Nine QTL for DTA, five QTL for FLN and three QTL for PH were detected only in short-day environments. QTL for photoperiod response were detected on four chromosomes for PPR[Subscript DTA], on three chromosomes for PPR[Subscript FLN] and on three chromosomes for PPR[Subscript PH]. Chromosomes 2, 3, 4, 5, 6, 8, 9, and 10 had a cluster of QTL for different traits. This might suggest a common initial mechanism with subsequent specific pathways that regulate different traits.
Book Synopsis Genetic Analysis of Quantitative Trait Loci with the Early Generations of an Elite, Single-cross Maize Population by : Dwi Asmono
Download or read book Genetic Analysis of Quantitative Trait Loci with the Early Generations of an Elite, Single-cross Maize Population written by Dwi Asmono and published by . This book was released on 1998 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evidence of consistent detection was observed at 27% (25 of 93) of the QTLS. For grain yield and yield components, seventy-one QTLs were detected across samples, only thirteen were common in both samples. Chromosome 6 was significantly associated with grain yield in both samples. The magnitudes of QTL effects were not always consistent when QTLs were detected in a region for both samples. Most QTLs detected in both samples had the same parental effects.
Book Synopsis Identification of Genomic Regions Controlling Maturity in Maize (Zea Mays L.) by : Tae San Kim
Download or read book Identification of Genomic Regions Controlling Maturity in Maize (Zea Mays L.) written by Tae San Kim and published by . This book was released on 1992 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mapping Quantitative Trait Loci for Maturity and Correlated Traits in Maize Using RFLP Markers by : Sidney Netto Parentoni
Download or read book Mapping Quantitative Trait Loci for Maturity and Correlated Traits in Maize Using RFLP Markers written by Sidney Netto Parentoni and published by . This book was released on 1993 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: RFLP markers were used to map quantitaive trait loci for maturity and correlated traits in maize. A linkage map was obtained forhe cross A662 x B73 using data from 63 RFLP markers. A total of 151 F3 lines form A662 X B73 were evaluated in per se and in testcrosses in three Minnesota location in 1992. MAPMAKER-QTL was used to analysis the F3 data an single factor ANOVA considering only the two homozygous parental marker classes was used for analyze the testcross data. Five unlinked chromosomal regions (chromosomes 1, 3, 5, 8 and 9) were shown to be associated with early maturity in this cross. A major maturity factor was identified on chromosome 8 close to the marker UMC12. This region was also strongly associated with node number. The maturity regions identified in general were also linked to plant height or to one of the plant height components, suggesting the possibility of pleiotropy. However, our data are not sufficient to distinguish between pleiotropy and tight linkage. Plant height is controlled by both node number and internode length and these last two traits are controlled by different chromosomal regions. No evident was found for marker class x location interaction. F3 per se evaluation and testcross results showed the same chromosomal regions as important in controlling maturity in the cross studied. Results from the F3 per se analysis agree with the conclusions from a previous study (Kim, 1992) using backcross derived lines from the cross A662 x B73.
