Download or read book Evaluation of Maize Zea Mays L Inbred Lines by Their Three Way Cross Hybrid Performance written by GANGASHETTI M. G and published by . This book was released on 1996 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book GGE Biplot Analysis written by Weikai Yan and published by CRC Press. This book was released on 2002-08-28 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research data is expensive and precious, yet it is seldom fully utilized due to our ability of comprehension. Graphical display is desirable, if not absolutely necessary, for fully understanding large data sets with complex interconnectedness and interactions. The newly developed GGE biplot methodology is a superior approach to the graphical analys
Download or read book Heterosis of Maize Zea Mays L Inbred Lines written by Shushay Welderufael Abrha and published by LAP Lambert Academic Publishing. This book was released on 2014-04 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses on heterosis of 48 genotypes produced from crossing of 24 elite maize inbred lines with two testers and four standard checks in line x tester mating method and the genotypes were evaluated in 6x9 alpha lattice design replicated twice. Nine potential hybrids with grain yield above 9505.9 kg/ha have been identified either for release as hybrids or for further use in maize breeding program.
Download or read book Performance of Multiple eared Inbred Lines in Three way Hybrids written by Farrell Mull Bagshaw and published by . This book was released on 1959 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantitative Genetics in Maize Breeding written by Arnel R. Hallauer and published by Springer Science & Business Media. This book was released on 2010-09-28 with total page 669 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize is used in an endless list of products that are directly or indirectly related to human nutrition and food security. Maize is grown in producer farms, farmers depend on genetically improved cultivars, and maize breeders develop improved maize cultivars for farmers. Nikolai I. Vavilov defined plant breeding as plant evolution directed by man. Among crops, maize is one of the most successful examples for breeder-directed evolution. Maize is a cross-pollinated species with unique and separate male and female organs allowing techniques from both self and cross-pollinated crops to be utilized. As a consequence, a diverse set of breeding methods can be utilized for the development of various maize cultivar types for all economic conditions (e.g., improved populations, inbred lines, and their hybrids for different types of markets). Maize breeding is the science of maize cultivar development. Public investment in maize breeding from 1865 to 1996 was $3 billion (Crosbie et al., 2004) and the return on investment was $260 billion as a consequence of applied maize breeding, even without full understanding of the genetic basis of heterosis. The principles of quantitative genetics have been successfully applied by maize breeders worldwide to adapt and improve germplasm sources of cultivars for very simple traits (e.g. maize flowering) and very complex ones (e.g., grain yield). For instance, genomic efforts have isolated early-maturing genes and QTL for potential MAS but very simple and low cost phenotypic efforts have caused significant and fast genetic progress across genotypes moving elite tropical and late temperate maize northward with minimal investment. Quantitative genetics has allowed the integration of pre-breeding with cultivar development by characterizing populations genetically, adapting them to places never thought of (e.g., tropical to short-seasons), improving them by all sorts of intra- and inter-population recurrent selection methods, extracting lines with more probability of success, and exploiting inbreeding and heterosis. Quantitative genetics in maize breeding has improved the odds of developing outstanding maize cultivars from genetically broad based improved populations such as B73. The inbred-hybrid concept in maize was a public sector invention 100 years ago and it is still considered one of the greatest achievements in plant breeding. Maize hybrids grown by farmers today are still produced following this methodology and there is still no limit to genetic improvement when most genes are targeted in the breeding process. Heterotic effects are unique for each hybrid and exotic genetic materials (e.g., tropical, early maturing) carry useful alleles for complex traits not present in the B73 genome just sequenced while increasing the genetic diversity of U.S. hybrids. Breeding programs based on classical quantitative genetics and selection methods will be the basis for proving theoretical approaches on breeding plans based on molecular markers. Mating designs still offer large sample sizes when compared to QTL approaches and there is still a need to successful integration of these methods. There is a need to increase the genetic diversity of maize hybrids available in the market (e.g., there is a need to increase the number of early maturing testers in the northern U.S.). Public programs can still develop new and genetically diverse products not available in industry. However, public U.S. maize breeding programs have either been discontinued or are eroding because of decreasing state and federal funding toward basic science. Future significant genetic gains in maize are dependent on the incorporation of useful and unique genetic diversity not available in industry (e.g., NDSU EarlyGEM lines). The integration of pre-breeding methods with cultivar development should enhance future breeding efforts to maintain active public breeding programs not only adapting and improving genetically broad-based germplasm but also developing unique products and training the next generation of maize breeders producing research dissertations directly linked to breeding programs. This is especially important in areas where commercial hybrids are not locally bred. More than ever public and private institutions are encouraged to cooperate in order to share breeding rights, research goals, winter nurseries, managed stress environments, and latest technology for the benefit of producing the best possible hybrids for farmers with the least cost. We have the opportunity to link both classical and modern technology for the benefit of breeding in close cooperation with industry without the need for investing in academic labs and time (e.g., industry labs take a week vs months/years in academic labs for the same work). This volume, as part of the Handbook of Plant Breeding series, aims to increase awareness of the relative value and impact of maize breeding for food, feed, and fuel security. Without breeding programs continuously developing improved germplasm, no technology can develop improved cultivars. Quantitative Genetics in Maize Breeding presents principles and data that can be applied to maximize genetic improvement of germplasm and develop superior genotypes in different crops. The topics included should be of interest of graduate students and breeders conducting research not only on breeding and selection methods but also developing pure lines and hybrid cultivars in crop species. This volume is a unique and permanent contribution to breeders, geneticists, students, policy makers, and land-grant institutions still promoting quality research in applied plant breeding as opposed to promoting grant monies and indirect costs at any short-term cost. The book is dedicated to those who envision the development of the next generation of cultivars with less need of water and inputs, with better nutrition; and with higher percentages of exotic germplasm as well as those that pursue independent research goals before searching for funding. Scientists are encouraged to use all possible breeding methodologies available (e.g., transgenics, classical breeding, MAS, and all possible combinations could be used with specific sound long and short-term goals on mind) once germplasm is chosen making wise decisions with proven and scientifically sound technologies for assisting current breeding efforts depending on the particular trait under selection. Arnel R. Hallauer is C. F. Curtiss Distinguished Professor in Agriculture (Emeritus) at Iowa State University (ISU). Dr. Hallauer has led maize-breeding research for mid-season maturity at ISU since 1958. His work has had a worldwide impact on plant-breeding programs, industry, and students and was named a member of the National Academy of Sciences. Hallauer is a native of Kansas, USA. José B. Miranda Filho is full-professor in the Department of Genetics, Escola Superior de Agricultura Luiz de Queiroz - University of São Paulo located at Piracicaba, Brazil. His research interests have emphasized development of quantitative genetic theory and its application to maize breeding. Miranda Filho is native of Pirassununga, São Paulo, Brazil. M.J. Carena is professor of plant sciences at North Dakota State University (NDSU). Dr. Carena has led maize-breeding research for short-season maturity at NDSU since 1999. This program is currently one the of the few public U.S. programs left integrating pre-breeding with cultivar development and training in applied maize breeding. He teaches Quantitative Genetics and Crop Breeding Techniques at NDSU. Carena is a native of Buenos Aires, Argentina. http://www.ag.ndsu.nodak.edu/plantsci/faculty/Carena.htm
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 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 Comparisons Among Five Different Testers for the Evaluation of Unselected Lines of Maize Zea Mays L written by Eleuterio Lopez-Perez and published by . This book was released on 1979 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Choice of the appropriate tester for the evaluation of corn inbred lines is of major concern among corn breeders. Hence, comparisons among different testers are needed to determine their effectiveness in selecting inbred lines and in population improvement programs. Also, it is to determine whether to test the lines of corn early or late during the inbreeding process. Knowledge of the relationships between the mean yield of the lines per se and their testcrosses also is important. My objectives were to: 1) determine if there were significant differnces among S1 testcrosses, among S8 testcrosses, and between S1 versus S8 testcrosses, 2) compare the genetic variation among the different sets of testcrosses, 3) determine the relationships of inbred line performance among the different types of testers, and 4) compare the relation of testcross performance to line per se performance. Highly significant differences among the S1 and among the S8 testcorsses were found for all the traits. No significant differences, however, were detected between the S1 versus the S8 testcrosses for most of the traits. Genetic variance among the different S1 line and S8 line testcrosses was as theoretically expected for the related testers. That is, greater testcross genetic variance with the low yielding tester than the high yielding tester at both the S1 and S8 levels. S1 line testcrosses made with an unrelated high yielding tester, however, had the greatest genetic variance. Use of an unrelated high yielding inbred line was, (...).
Download or read book Combining Ability Among and Within Early Medium and Late Maturity Classes of Maize Zea Mays L Inbred Lines written by Mohamed Barre Ahmed and published by . This book was released on 1993 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on the Combining Ability Gene Action and Performance of Inbred Lines in Single Three Way and Double Cross Combinations in Maize Zea Mays L written by M. I. Handoo and published by . This book was released on 1965 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Developing Drought and Low N tolerant Maize written by G. O. Edmeades and published by CIMMYT. This book was released on 1996 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Incidence and intensity of drought and low N stresss in the tropics; Case studies strategies for crop production under drought and low n stresses in the tropics; Stress physology and identification of secondary traits; Physiology of low nitrogen stress; Breeding for tolerance to drought and low n stresses; General breeding strategies for stress tolerance; Progress in breeding drought tolerance; Progress in breeding low nitrogen tolerance; Experimental design and software.
Download or read book Tropical Maize written by R. L. Paliwal and published by Fao. This book was released on 2000 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize is an important crop and the demand for as both food and animal feed is expected to grow by 235 million tonnes between now and 2030. In many countries it will be difficult to increase the area under cultivation, so gains will have to come from increased productivity and intensification of the cropping system. This book looks at all aspects of tropical maize production from physiology, growing environments, pest and diseases, plant breeding and crop management and it is a substantial information resource necessary for the development of the crop.
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 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 Evaluation of Second Cycle Inbred Lines of Maize written by Rama Dayal Singh and published by . This book was released on 1956 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Three Methods of Inbred Line Development in Two Maize Populations written by Gbadebo Olaoye and published by . This book was released on 1990 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Use of Two Single Cross Testers in Evaluating the Inbred Lines of Maize Zea Mays L written by D.K. Nanda and published by . This book was released on 1960 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
