Download or read book Comparative Assessment of Commercial Grain Yield and Seed Production Potential of Single Cross Hybrids SCH and Modified Single Cross Hybrids MSCH in Maize Zea Mays L written by Thottempudi Kavya and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multi Location Evaluation of Agronomic Traits in Maize Hybrids written by Michael Cody McKee and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize (Zea mays L.) is one of the main crops grown in the United States. Genetic improvement over the last century has seen a shift from using open-pollinated varieties to single cross hybrids. This has resulted in major grain yield gains and improved management methodologies. However, there is still concern about reduced genetic diversity in elite corn germplasm and the potential effects this could have on future maize productivity in the presence of numerous abiotic and biotic pressures. One solution to this issue is the incorporation of exotic germplasm into existing maize improvement programs. This exotic material must be evaluated and characterized because too much or poorly matched exotic material can lead to reduced productivity. The use of multiple environments representative to the target improvement area is the best way to determine the true potential of certain material. The objectives of this research were to: i) estimate the responses of hybrids to aflatoxin and their agronomic performance across a range of environments under inoculation with Aspergillus flavus; ii) identify the hybrids within each group that exhibit the lowest levels of contamination; iii) analyze the relationship between agronomic performance and aflatoxin accumulation; and iv) determine how Genotype x Environment interactions affect these traits. Agronomic data was collected in ten Texas environments in 2005 for hybrids created from yellow, white, and Quality Protein Maize material that was crossed with one of two elite temperate inbred testers, LH195 or LH210. Response to aflatoxin was measured in eight of these environments. U.S. commercial hybrids were used as checks. Significant differences between hybrids were observed at different environments for different traits. Overall the experimental hybrids had lower aflatoxin accumulation than the commercial checks. They also yielded lower and had lower test weights and 1000 kernel weights. However, there were some hybrids that were competitive with the commercial checks for these agronomic traits. The incorporation of this material into established U.S. lines could be beneficial with regards to aflatoxin accumulation and kernel quality, which could ultimately translate to higher yields and crop quality. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148414
Download or read book Comparison of the Performance of Reciprocal Test crosses Between Inbred Lines and a Single cross Hybrid in Maize written by J. C. Wells and published by . This book was released on 1950 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation on Seed Production Technology for Single Cross Maize Hybrids Zea Mays L NAH 2049 and NAH 1137 written by M.S. Shashibhaskar and published by . This book was released on 2015 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genotype X Environment Interaction Yield Stability and Adaption Responses of 25 Single cross Maize Zea Mays L Hybrids Grown in Michigan written by Kingstone Mashingaidze and published by . This book was released on 1987 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Conventional Modified Single Seed Descent and Doubled Haploid Breeding Methods for Maize Inbred Line Development Using GEM Breeding Crosses written by McDonald Bright Jumbo and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Choice of germplasm combined with use of efficient breeding methods and careful evaluation are essential tools for maize inbred line and hybrid development. Breeding crosses from the G ermplasm E nhancement of M aize (GEM) project (www.public.iastate.edu/~usda-gem) between exotic accessions and elite Corn Belt inbreds provide a unique opportunity for broadening US Corn Belt Maize germplasm by selecting exotic alleles in an elite genetic background. Progress in GEM could be enhanced by identifying more efficient procedures for both developing inbreds and determining which of the several hundred GEM breeding crosses have the most potential for future improvement and gene discovery. The primary research objective was to compare four breeding methods for their effectiveness and efficiency for developing superior maize inbred lines and hybrids from GEM breeding crosses. In addition, the study also aimed at identifying breeding methods that could be useful for prioritizing GEM breeding crosses for further line development and trait identification. Furthermore, breeding methods were compared to determine the effectiveness of mass selection for producing more adapted genotypes from GEM breeding crosses. Four breeding methods; Conventional GEM (CG), Conventional Mass (CM), Modified Single Seed Descent (MSSD) and Doubled Haploid (DH) were compared using three GEM breeding crosses ANTIG01:N16DE4, AR16035:S0209, and DKXL212:S0943b. Results showed that more DH lines were recovered from the non-stiff stalk than from the stiff stalk breeding crosses in the DH method due to differences in chromosome doubling rather than the induction phase. Field observations showed more uniformity in the MSSD S 2 lines derived from the Stiff Stalk than the non-Stiff Stalk (ANTIG01:N16DE4) breeding cross. The testcross evaluations generally showed no method effects between breeding methods, but method effects were present in the per se agronomic evaluations. The MSSD and CM methods had a higher proportion of top five lines in the second year testcross evaluations (about one third each) based on both yield and yield/moisture performance compared to the CG and DH methods. Hybrids from MSSD lines tended to have higher grain moisture than hybrids from the CG, CM and DH methods, but MSSD hybrids with high yield/moisture could be selected. The MSSD method may be an effective and efficient alternative to both pedigree and DH methods for developing high performing lines from the GEM breeding crosses.
Download or read book Improving Maize Inbred Line Selection to Develop High Yielding and Stable Single Cross Hybrids Using Plant Density as a Selection Criterion written by J. Arahon Hernandez-Guzman and published by . This book was released on 2007 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of First Generation Hybrids Upon Yields of Corn written by Lawrence Root Waldron and published by . This book was released on 1924 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Innovative Practices to Enhance Seed Yield and Quality of Single Cross Hybrid Maize Zea Mays L NAH 2049 Nithyashree written by D.B. Jithendra and published by . This book was released on 2012 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Single Cross Hybrid Seed Production Technology in Maize written by V. K. Yadav and published by . This book was released on 2011 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Resource Allocation and Genomic Prediction in Maize Zea Mays L Hybrid Breeding and a Genetic Analysis of Pericarp Pigmentation written by Dylan Schoemaker and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize (Zea mays L.) is a globally important crop species sold as a hybrid and is a model system for both genetics and plant breeding research. The maize breeding process involves identification of new inbred lines, followed by the identification and production of commercial hybrids from crosses of inbreds. Genomic selection and evaluation of hybrid phenotypes are important components of this process. In this dissertation, I use a large multi-environment trial dataset to explore the impact of resource allocation when developing genomic prediction models. Resource-efficient training sets can be developed using three to five environments and a single tester to predict both plant height and grain yield. A second study in my dissertation focused on prediction of hybrid combinations and the importance of general and specific combining ability in identifying new hybrids. The results demonstrated that hybrids with the greatest grain yield result from parents with a high general combining ability, but hybrids with the greatest performance may not have the largest specific combining ability deviation. Therefore, modeling only additive genetic relationships can lead to an accurate genomic prediction model during early-stage testing in a hybrid maize breeding program. The third study in my dissertation was a genetic analysis of pericarp pigmentation in progenies of commercial dent germplasm. Allelic variation at the well-studied pericarp color1 (P1) locus was significantly associated with pericarp pigmentation. The results from these projects provide novel insight into the design of hybrid breeding programs and the allocation of resources when implementing genomic selection. The research also provides candidate genes for geneticists or maize breeders to aid in the development of inbred lines with novel pericarp hues and elite agronomic characteristics.
Download or read book General and Specific Combining Ability of Eight Maize Inbred Lines Part I II Comparative Performance of Single Double and Synthetic Hybrids written by Devender Kumar Nanda and published by . This book was released on 1964 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stability Analysis of Single cross Hybrids of Maize Zea Mays L written by Jean Barbara Cormack and published by . This book was released on 1997 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Yield data from three experiments of maize single cross trials grown at 5 to 8 locations in 1994, 1995, and 1996 were analyzed for stability using regression methods. Only single crosses grown in all locations and years (environments) were included in the analyses. Effects for environments, genotypes, genotype x environment, heterogeneity of regression (slopes), and deviations from regression were tested for significance. Slopes and deviation from regression were calculated for each single cross and slopes were tested for equality to 0.0 and 1.0. Slopes sums of squares were subdivided into sums of squares due to concurrence and non-concurrence. Subsets of each experiment were also analyzed to examine whether stability changed in environments stratified by mean yield levels or by years. The analysis of one experiment revealed significant differences among single cross slopes and non-concurrence. The other two experiments were unusual in that the tests for heterogeneity of slopes were not significant.
Download or read book The Effect of Inbred Yield Component Modification on the Stability of Single Cross Maize Hybrids written by Ronald Scott Ferriss and published by . This book was released on 1978 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Argentine Maize Hybrids and Exotic X Temperate Testcrosses Across Environments written by Brett A. Ochs and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize (Zea mays L.) is grown in a wide range of environments and altitudes worldwide. Maize has transitioned from open pollinated varieties to single cross hybrids over the last century. While maize production and genetic gain has increased, genetic diversity among U.S. maize hybrids has narrowed. Problems, such as insect pressure, diseases, and mycotoxins, present obstacles for breeders. One approach is to use exotic germplasm in breeding programs to provide useful, novel alleles for productivity, grain quality, and disease resistance. Little exotic germplasm has been used, because of lack of agronomic adaptation and problems with lodging, earliness, and tall plants in more temperate areas. Using exotic elite materials and evaluating them in targeted regions might increase success. Objectives of this research were: to characterize and evaluate agronomic adaptation and performance of Argentine commercial hybrids in the U.S., to evaluate semi-exotic testcrosses developed from semi adapted 100% tropical lines and elite U.S. inbred LH195, and to estimate response to aflatoxin contamination of Argentine hybrids and semi-exotic testcrosses under inoculation with Aspergillus flavus. Agronomic data was collected during 2004 in eleven Texas environments for Argentine hybrids, and eight Texas environments for semi-exotic testcrosses. Response to aflatoxin was measured in three southern Texas environments. U.S. commercial hybrids were used as checks. Significant differences among hybrids were observed for most environments and traits. In general, Argentine hybrids yielded lower, had lower 1000 kernel weights, and greater test weights than U.S. hybrids. Hybrids AX889, AX882MG, and AX890MG were competitive with U.S. hybrids for grain yield and were stable across environments. Semi-exotic testcrosses had similar lodging and grain moisture percentages, heavier test weights and competitive grain yields compared with U.S. hybrids. Hybrid TX-LAMA2002-9-2-B/lH195 had the highest overall grain yield mean for semi-exotic testcrosses and yielded better than two U.S. hybrids. Argentine hybrids had lower aflatoxin concentration than U.S. hybrids; several hybrids had less than 50 ng g−1 aflatoxin. Semi-exotic testcrosses had reduced aflatoxin compared to U.S. hybrids, with several hybrids under 35 ng g−1. These elite, exotic materials show promise for breeding programs, with competitiveness for grain yield, kernel traits, and reduced aflatoxin levels.
Download or read book Single Cross Hybrid Maize Seed Production Technology written by Sain Dass and published by . This book was released on 2009 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wisconsin Corn Hybrids written by Norman Percy Neal and published by . This book was released on 1948 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
