Download or read book A Genetic Study of Cold Tolerance and Related Traits in an Unselected and a Selected Maize Population written by Kent R. Keim and published by . This book was released on 1979 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report of Annual Corn and Sorghum Research Conference written by and published by . This book was released on 1987 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies of Cold Tolerance in Maize written by Michael Allen Chapman and published by . This book was released on 1984 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Changes in Physiological Traits Associated with Five Cycles of S1 Recurrent Selection in Two Maize Populations written by Bernard James Hable and published by . This book was released on 1985 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Five cycles of S1 recurrent selection for cold tolerance were conducted at Iowa State University in maize population BS13(SCT) and BSSS2(SCT). Previous studies have indicated that improvement in cold tolerance had been realized in these programs and that a correlated improvement in grain yield had taken place. The objective of this study were: 1) to examine the change in ontogenetic development correlated with changes in cold tolerance, 2) to evaluate changes in physiological traits and yield components associated with the previously observed correlated improvements in grain yield, and 3) to relate changes in means to changes in allelic frequencies and genetic drift. The CO, C5, and C0 c C5 intrapopulation cross of both BS13(SCT) and BSSS2(SCT), and the CO xCO and C5 x C5 interpopulation crosses were evaluated in five environments over three years. All experiments were planted in five environments over three years. All experiments were planted after 20 April in central Iowa. To assess the correlated changes, the C0 and C% cycle means were compared and a model proposed by Smith (1979a) was utilized to estimate correlated changes in gene frequency and changes in gne frequency due to restricted population size. The recurrent selection programs for cold tolerance resulted in earlier flowering in both of the population evaluated in this study. The C5 cycels of both BS13(SCT) and BSSS2(SCT) silked in at least 40 fewer growing degree days (GDD) than the CO cycles, and estimated, correlacted for genetic drift, (...).

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 850 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 1991 with total page 898 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 Genetic Variability for Cold Tolerance in a Maize Zea Mays L Population written by Robin K. Duffy Cowen and published by . This book was released on 1985 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1994 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Plant Physiology Vol 8 written by A. Hemantaranjan and published by Scientific Publishers. This book was released on 2006-07-01 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: The publication of Volume 8 of the International Treatise Series on Advances in Plant Physiology has been feasible - exclusively and unquestionably due to commendable contributions from World Scientists of distinction in explicit fields. within eight years, the treatise series has been instituted in the spirits and compassion of illustrious readers all through the world. The proficient International and National Co-ordinators have all along unified their views for the expediency of readers assisting them to speed up important research work in the field of Plant and Crop Physiology, Biochemistry & Plant Molecular Biology. in spite of handiness of quick accessibility of vast literature from internet, this treatise series in the field of life sciences has been realized over and above to be like a true guide, friend and philosopher, everlastingly enlightening the most hidden perceptible nerves of an individual worker, which is beyond the competence of mere web services. The volume 8 is absolutely another one of its kinds for incorporation of most timely and important worthy reviews of diverse objectives contributed by forty four well-informed, admirable and documented scientists/ stalwarts, of which twenty three participated from abroad. The original writing coming in bounteous journals of international repute covering new technologies and tools in plant science research have been pulled together in affirmative, prolific and supportive manner by specialists all over the globe. In this volume efforts have been made to fetch together twenty one indispensable review articles, duly evaluated by the respective Consulting Editors of international stature from India, U.K., U.S.A., Argentina, Australia, France, Germany, Japan, Spain, Portugal, Israel, and Morocco and rationally distributed in eight sections. Indeed, the treatise is wealth for interdisciplinary exchange of information. Apart from fulfilling need of this kind of exclusive edition in different volumes for research teams in Molecular Plant Physiology and Biochemistry in traditional and agricultural universities, institutes and research laboratories throughout the world, it would be extremely a constructive book and a voluminous reference material for acquiring advanced knowledge by post-graduate and Ph.D. scholars in response to the innovative courses in Plant Physiology, Plant Biochemistry, Plant Molecular Biology, Plant Biotechnology, Environmental Sciences, Plant Pathology, Microbiology, Soil Science & Agricultural Chemistry, Agronomy, Horticulture, and Botany.

Download or read book Agronomy News written by and published by . This book was released on 1995 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sept.-Oct. issue includes list of theses and dissertations for U.S. and Canadian graduate degrees granted in crop science, soil science, and agronomic science during the previous academic year.

Download or read book The Identification and Use of Isozyme Marker Loci in Selection for Cold Tolerance in Maize Zea Mays L written by Robert A. Guse and published by . This book was released on 1987 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Variation for Chilling Stress and Spectral Reflectance in Short Season Maize written by Wisam Obeidat and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing early season cold tolerance of maize (Zea mays L.) has the potential to lengthen its growing season and enhance yields. We evaluated cold tolerance across 44 inbred and 102 hybrid genotypes in field and controlled environment experiments. Cold tolerance was quantified as the proportion of dry weight (PDW) of plants subjected to cold temperatures or planted early, relative to dry weight of plants grown in control temperatures or planted late. Also, leaf reflectance spectroscopy was used as an alternate indicator of cold stress response. In field experiments, significant effects of genotype, planting date, environment and their interactions were detected for PDW; the mean dry weight per plant for the early planting was considerably lower than for the late planting in five field environments. Cold stress exposure resulted in higher leaf reflectance in the 500 ̶ 680 nm region and lower reflectance between 758 ̶ 1000 nm. We identified novel reflectance predictors, both normalized difference indices and specific wavelengths of first derivative reflectance spectra, that correlated with PDW. In some cases the strongest correlations were found when reflectance data came from unstressed plants. Multiple regression models combining first derivative reflectance at multiple wavelengths, measured on plants not exposed to cold stress, provided the best correlation with PDW; however in general these models were unique to an experiment. Genetic control and heritability of plant dry weight and leaf spectral reflectance under control and early planting conditions was investigated in the field using a North Carolina Design II mating experiment. Consistent general combining ability estimates from early and late planting indicated that additive and dominant gene effects explained hybrid biomass variation across both planting dates. A number of spectral traits were heritable, but parental contributions to hybrid values were moderate. In conclusion, we find that parents explain at most moderate levels of hybrid spectral reflectance variation, across all spectral analysis tools. Thus, selection of traits such as hybrid biomass using spectral reflectance will be inefficient. Nonetheless, we find spectral reflectances stably distinguish maize genotypes within a population irrespective of temperature treatments, so selecting inbred lines using spectral reflectance may advance breeding efforts.

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 Inheritance and Improvement of Cold Tolerance Traits in Maize written by Richard L. McConnell and published by . This book was released on 1978 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Progress from Selection for Cold tolerance in Two Adapted Maize Populations written by Abdurahman Ali Bakri and published by . This book was released on 1974 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissection of the Genetic Architecture of Domestication Traits in Maize and Its Ancestor Teosinte written by Chin Jian Yang and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Domestication provides an excellent model for understanding the evolution of quantitative traits due to strong morphological divergence that is often accompanied by profound genetics divergence between the domesticate and its ancestor. Here, we are interested in using maize domestication as a model for understanding genetic changes that distinguish maize from its ancestor teosinte. Beginning at a single gene level, we identified a gene called ZmYAB2.1 through quantitative trait locus (QTL) fine-mapping. ZmYAB2.1 was selected for lower expression in maize which led to shorter ear internode length and more compact grains on an ear for improving harvestability. Further characterization of ZmYAB2.1 revealed that this gene acts in a background dependent manner. Subsequently, we expanded our approach to multiple genes level by mapping QTLs for sexual conversion of the terminal lateral inflorescence in maize. We identified three QTLs (STAM1.1, STAM1.2 and STAM2.1) that are responsible for the sexual conversion and other related domestication traits. Additionally, we also narrowed STAM2.1 down to a 600 kb region with two candidate genes. As our perspective moved from a single gene to a network of multiple genes, we were keen on understanding the genetic changes during domestication on a broader scale. We sampled 18 traits in two large populations of teosinte and maize landrace for estimating additive and dominance genetic variances, genetic-by-environment variances, genetic correlations and genetic covariances. While we observed variable divergence among the 18 domestication traits, we identified a consistent pattern of reduced genetics variability in reproduction-related traits. We inferred weak selection intensities across all domestication traits and moderate genetic constraint during early domestication. We showed that selection for more grains along a single row on an ear would lead to the largest evolutionary gain in all domestication traits with minimal constraint. Overall, our approaches in studying maize domestication offer several different perspectives on the evolution of a major crop from a wild plant.

Download or read book Screening for Low Temperature Stress Tolerance in Maize written by Shelly Nicole Shurney and published by . This book was released on 2003 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize (Zea mays L.), is considered by many to be one of the most meaningful crops grown in the USA and in many countries around the world. Despite its sub-tropical origins, maize endures many unfavorable conditions effecting growth and development. With a wide genetic background, many desirable cold tolerant traits in maize have been identified, but there are still many more to be discovered. The method of identifying these various mechanisms and traits of cold tolerance is the purpose of my study. Three maize inbred (A619, B73, CO255) lines that all have illustrated various genetic differences were used to determine: electrical conductivity, percent potassium leakage as a result of membrane permeability and dry weight accumulation. Seedlings were grown at 22/24°C until the 4th leaf stage at which time they were transferred to the experimental treatment regime of 8/6°C for 48 hours and 9 hours. After stress treatments regime plants were returned to the control temperature of 22/24°C to recovery until the 5th leaf stage. There were significant differences found among all growth parameters tested. Inbred line B73 was found to have the highest percentage of electrical conductivity when tested at 48 hours of 8/6°C. B73 was also recorded to have the highest amount of potassium leached as a result of treatment regime. When comparing the amount of dry weight accumulation CO255 was the largest of the three inbred lines tested. But when dry weight was compared before and after treatment B73 had the largest amount of growth after recovery from the treatment regime. This suggests that though CO255 was the largest of all the inbred lines tested, B73 had a greater amount of dry weight accumulation after or during recovery. The evaluation of these inbred lines did not allow a definite evaluation of the whole genetic background of the experimental lines tested, but chilling did induce the seedlings to respond in such a way that desirable characteristics could be identified.