Download or read book Plant Density Effects on Maize Synthetics Selected for Different Planting Rates and Agronomic Traits written by António André and published by . This book was released on 1996 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Artificial Selection and Planting Density on Performance Stability Across Environments and Yield Component Traits in Maize Zea Mays L written by Bridget McFarland (Ph.D.) and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plant breeders selectively breed plants to maximize productivity within the context of the target environment(s). These environments can be viewed as entire fields or regions with common features, such as weather or soil characteristics, or specific growing conditions unique to a single plant within a field. The objectives of this dissertation are: (1) assess the effects of selection and environment cues on plant performance and stability using maize hybrids derived from a common genetic background and (2) evaluate the effect of planting density on yield component traits in maize. Both of these studies utilize resources and datasets that are part of the Genomes To Fields (G2F) Initiative. Chapter One provides background on the history of maize and its importance, plant development and various abiotic influences on grain yield, and an overview of genotype-by-environment interaction (G × E) and stability. Chapter Two examines how breeding for productivity has influenced trait stability and which environmental variables are most influential in hybrid performance. Across a range of environments, we observed increased stability and improved performance in lines that had undergone multiple cycles of selection relative to unselected lines across most productivity traits (such as, stand count, flowering time, and grain yield), except stalk lodging. The environmental variables that were most influential on plant performance were those related to soil classification and day length. When comparing the environmental variables estimates across models, using genotype (G) and G × E variance in place of the raw phenotypic trait values generated environmental that were significantly correlated to the traditional stability environmental rankings. This suggests that environmental variance is not a good indicator of environment ranking, while G+ G×E better explains hybrid performance. In Chapter Three, an ever-increasing density (EID) plot design was used to evaluate the response of hybrids to increased planting densities using image-based phenotyping of grain yield components. This study used a set of three biparental populations sharing one parent in common, the others representing a highly selected, an almost complete unselected, and an intermediately selected parent. Kernel size traits were the most sensitive to increases in planting density and decreased significantly, while ear and cob width were the least sensitive and did not significantly change. The lines derived from the least selected parent produced the heaviest cobs and kernels, and largest kernel size, while the lines derived from the commercially relevant and highly selected parent produced the lightest cobs and smallest kernels. When connecting density traits data with production-level G2F data, ear height in the production-level environments was significantly correlated with ear height at two of the EID treatments. The known correlation between these two formats supports the continued use of the EID design to evaluate varying planting density effects. Overall, this work emphasizes the utility of dissecting environments at multiple levels to better understand the driving forces of plant performance and stability, and an alternative planting density scheme to understand the effects of variable planting density on yield component traits, and genetically dissect grain yield components for continued improvement.

Download or read book Masters Theses in the Pure and Applied Sciences Accepted by Colleges and Universities of the United States and Canada written by and published by . This book was released on 1996 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Masters Abstracts International written by and published by . This book was released on 1996 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Maydica written by and published by . This book was released on 2003 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Journal devoted to maize and allied species.

Download or read book Selection Procedures in the Development of Maize Inbred Lines and the Effects of Plant Densities on the Relationhips Between Inbred Traits and Hybrid Yields written by W.A. Russell and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research was to use five selection procedures to developed inbred lines of maize (Zea mays L.): (1) to compare the selected lines for performance per se and in testcrosses at various plant densities, thereby evaluating the selection procedures, and (2) to determine the effects of plant densities on the relationships among plant, ear, and grain traits of the inbred lines and between these traits and hybrid yield performance. The source populations was an Iowa Synthetic, BS1. Five groups of lines were obtained : Gropu 1, selected visually at a density of 59,000 plants/ha in rows spaced 102 cm; Group 2, selected visually and for one ear per plant at a density of 29,500 plants/ha in rows spaced 102 cm; Group 3, selected visually and for two ears per plant at a density of 29,500 plants/ha in rows spaced 102 cm; Group 4, selected visually at a density of 59,000 plants/ha in rows spaced 51 cm; Group 5, selected for testcross performance (double-cross tester) at 59,000 plants/ha in rows spaced 51 cm (...).

Download or read book Agrindex written by and published by . This book was released on 1993 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Agronomy Abstracts written by and published by . This book was released on 1995 with total page 1348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes abstracts of the annual meetings of the American Society of Agronomy; Soil Science Society of America; Crop Science Society of America ( - of its Agronomic Education Division).

Download or read book Drought Stress in Maize Zea mays L written by Muhammad Aslam and published by Springer. This book was released on 2015-11-20 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on early germination, one of maize germplasm most important strategies for adapting to drought-induced stress. Some genotypes have the ability to adapt by either reducing water losses or by increasing water uptake. Drought tolerance is also an adaptive strategy that enables crop plants to maintain their normal physiological processes and deliver higher economical yield despite drought stress. Several processes are involved in conferring drought tolerance in maize: the accumulation of osmolytes or antioxidants, plant growth regulators, stress proteins and water channel proteins, transcription factors and signal transduction pathways. Drought is one of the most detrimental forms of abiotic stress around the world and seriously limits the productivity of agricultural crops. Maize, one of the leading cereal crops in the world, is sensitive to drought stress. Maize harvests are affected by drought stress at different growth stages in different regions. Numerous events in the life of maize crops can be affected by drought stress: germination potential, seedling growth, seedling stand establishment, overall growth and development, pollen and silk development, anthesis silking interval, pollination, and embryo, endosperm and kernel development. Though every maize genotype has the ability to avoid or withstand drought stress, there is a concrete need to improve the level of adaptability to drought stress to address the global issue of food security. The most common biological strategies for improving drought stress resistance include screening available maize germplasm for drought tolerance, conventional breeding strategies, and marker-assisted and genomic-assisted breeding and development of transgenic maize. As a comprehensive understanding of the effects of drought stress, adaptive strategies and potential breeding tools is the prerequisite for any sound breeding plan, this brief addresses these aspects.

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1970 with total page 1208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biological Agricultural Index written by and published by . This book was released on 1997 with total page 2984 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index Agriculture written by and published by . This book was released on 1984 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 1086 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1973- include the following subject areas: Biological sciences, Agriculture, Chemistry, Environmental sciences, Health sciences, Engineering, Mathematics and statistics, Earth sciences, Physics, Education, Psychology, Sociology, Anthropology, History, Law & political science, Business & economics, Geography & regional planning, Language & literature, Fine arts, Library & information science, Mass communications, Music, Philosophy and Religion.

Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 1987-10 with total page 1238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Agronomy Journal written by and published by . This book was released on 1959 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: An international journal of agriculture and natural resource sciences.

Download or read book Cereal Grain Crops written by Neal C. Stoskopf and published by . This book was released on 1985 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cereal crops - the heart of world agriculture; Botany and physiology of cereal crops; Variability in cereal grains; Cereal crop yield - a systems approach; Cereal crop yield - improvement through genetics and plant breeding; Cereal crop yield - impact of environment; Production aspects: winter crops, hardiness and cold tolerance, summer fallow, soil salinity; Cereals as forages, livestock feeds, and in mixtures; Hybrids; Seed production and technology; Crop residues; Cereal crop quality; Cereal crop pests; International links to meet world food needs; Rice; Corn; Sorghum; Wheat; Rye; Triticale; Pearl millet; Barley and oat; Wild rice.