Download or read book Inheritance of Cold Tolerance in Maize Zea Mays L written by Melvin Vern Splitter and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on the Genetics and Breeding of Maize Zea Mays L for Cold Tolerance and Early Maturity written by Obaid Tahir Hassan and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Screening and Breeding for Cold Tolerance in Maize Zea Mays L written by Robert S. Zemetra and published by . This book was released on 1983 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Analyses of Internode Elongation and Cold Stress Tolerance in Maize written by Luis Mariano Avila Bolivar and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Modulation of internode elongation can impact maize (Zea mays L.) yield. In maize, plant height is often positively correlated with grain and biomass yields. Conversely, semi dwarf varieties have been used to achieve higher grain yields in wheat and sorghum by preventing lodging and by allocating more resources to grain filling instead of vegetative tissues. Tolerance to suboptimal temperatures is also a sought after trait in maize, as it would make possible to expand the cultivated areas to higher latitudes and allow for early planting, resulting in a longer growing season and higher yields. In this thesis I apply the tools and resources available since the publication of the first maize genome draft to investigate internode elongation and cold tolerance in maize. Using a forward genetics approach I identified GRMZM2G366698 (an inositol polyphosphate 5- phosphatase) as the gene affected by the mutation in brevis plant1 (bv1), a semi dwarf mutant of maize first reported in the 1930's. Further characterization of bv1 and a study of the RNA transcript abundance differences between bv1 and wild type maize plants suggest that auxin mediated inositol polyphosphate and/or phosphoinositide signalling are implicated in maize stem elongation. I used RNA-Seq to investigate the transcriptional response of seedlings of cold tolerant CG60 and cold sensitive CG102 maize inbreds during cold stress and recovery after the cold stress. I found that the cold treatment caused changes in the expression of more than 40% of the genes expressed in leaves, with repression of genes involved in photosynthesis, and induction of genes involved in transcription regulation and protein phosphorylation. Transcript abundances observed 24 hours after returning to optimal growing temperature identified genes that could be involved in acclimation to cold or whose expression has been disrupted by the stress.
Download or read book Inheritance of Cold Tolerance in Maize Zea Mays L written by Melvin Vern Splitter and published by . This book was released on 1972 with total page 588 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 A Study of the Physiology and Inheritance of Drought Tolerance in Maize Zea Mays L written by Pek Ean Goh and published by . This book was released on 1973 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Identification of Quantitative Trait Loci Associated with Cold Tolerance in Maize Zea Mays L written by Choosak Jompuk and published by . This book was released on 2004 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Inheritance of Some Drought Adaptive Traits in Maize Zea Mays L written by Robert Gouantoueu Guei and published by . This book was released on 1991 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Maize Its Biology written by Jeff L. Bennetzen and published by Springer Science & Business Media. This book was released on 2008-12-25 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Maize: Its Biology centers on the past, present and future of maize as a model for plant science research and crop improvement. The book includes brief, focused chapters from the foremost maize experts and features a succinct collection of informative images representing the maize germplasm collection.
Download or read book The Maize Genome written by Jeffrey Bennetzen and published by Springer. This book was released on 2018-11-24 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses advances in our understanding of the structure and function of the maize genome since publication of the original B73 reference genome in 2009, and the progress in translating this knowledge into basic biology and trait improvement. Maize is an extremely important crop, providing a large proportion of the world’s human caloric intake and animal feed, and serving as a model species for basic and applied research. The exceptionally high level of genetic diversity within maize presents opportunities and challenges in all aspects of maize genetics, from sequencing and genotyping to linking genotypes to phenotypes. Topics covered in this timely book range from (i) genome sequencing and genotyping techniques, (ii) genome features such as centromeres and epigenetic regulation, (iii) tools and resources available for trait genomics, to (iv) applications of allele mining and genomics-assisted breeding. This book is a valuable resource for researchers and students interested in maize genetics and genomics.
Download or read book Evaluation of Chilling Temperatures Affecting Respiration and Net Photosynthetic Rates in Selected Inbred Maize Zea Mays L Genotypes written by Jon Anthony Musgrave and published by . This book was released on 1999 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chilling air and soil temperatures greatly impact the germination ability of early planted crop species. Breeding maize (Zea mays L.) inbreds to be more tolerant of chilling conditions may improve seedling growth in stressful northern latitude seedbeds, decrease exposure to water stress, maximize available photon flux density (PFD), and create higher potential yields. An emphasis on cold-tolerance by maize breeders may have resulted in a substantial shift downward in the baseline temperature for maize germination and plant development. The focus of this research was to examine the respiration and net photosynthetic responses of eight inbred maize genotypes representing a range in field vigor while grown at or subjected to 6°, 8°, 10°, 12°, and 25°C.
Download or read book Genetic Variability and the Inheritance of Aluminum Tolerance in Maize Zea Mays L written by R. Magnavaca and published by . This book was released on 1992 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
