Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"crop physiology"”.
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Genomic and Physiological Approaches to Improve Drought Tolerance in Soybean
… stress is a major global constraint for crop production, and improving crop tolerance to drought is of critical importance. Direct selection of drought tolerance among genotypes for yield is limited because of low heritability, polygenic control, epistasis effects, and genotype by …
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Quantifying plant physiological responses to drought and high-temperature stress in the Midwest U.S.: Through scaling from proximal hyperspectral sensing to satellite monitoring
… in the world and quantifying and predicting its crop productivity is critical to achieve and maintain global food security. To quantify crop productivity reliably, understanding crop responses to climate variability is a prerequisite, but our current knowledge and capability are limited …
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Delayed phytotoxicity syndrome in Louisiana rice caused by the use of thiobencarb herbicide
Thiobencarb (TB), widely used for the control of broadleaf weeds, grasses, and sedges in rice fields, is considered safe for rice plants when used at recommended rates. TB's reductive dechlorination product, dechlorinated thiobencarb (DTB), is highly toxic to rice. TB is naturally transformed into …
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Integrated functional anlaysis of quorum-sensing in the rice pathogenic bacterium Burkholderia glumae
Quorum sensing (QS) is a cell-to-cell communication mechanism that allows bacterial cells to collectively behave like a multicellular organism. It regulates the expression of toxoflavin, one of the major virulence factors of the rice pathogen, Burkholderia glumae. The QS system of B. glumae is …
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Dynamics of the sweetpotato potyvirus aphid pathosystem in Louisiana
… Aphids were captured in fields during the entire crop cycle, and A. gossypii and Rhopalosiphum padi, were the most abundant species occurring throughout the growing season. Virus infection of sentinel plants occurred mainly during the months of June to August when virus titers were high in …
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Studies on rice transformation and the use of transformed plants [electronic resource]
This research was conducted to enhance utilization of the Liberty herbicide resistance transgene in rice. Non-lethal methods to determine the sensitivity of transgenic rice plants to hygromycin B and Liberty were developed, tested and used in this research. Four homozygous transformed plants were …
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A novel system to study seed recalcitrance and dormancy - comparative proteomics between two Spartina species
Spartina alterniflora is a dominant salt marsh cordgrass along the U.S. Atlantic and Gulf coasts, and the species is widely used for wetland restoration in Louisiana. S. alterniflora seeds are shed dormant from the mother plant. However, long-term preservation of S. alterniflora seeds is …
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Persistent RNA Viruses of Common Bean (Phaseolus vulgaris): Distribution and Interaction with the Host and Acute Plant Viruses
… now is grown worldwide. As in the case of other crops, common bean can be infected with acute and persistent plant viruses. A modified dsRNA extraction method was developed and used in this study. The method was fast, economic, versatile, and required relatively small amounts of desiccated plant …
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Genetics and genomics studies of rice disease resistance and development of alternative disease management methods for bacterial panicle blight and sheath blight
Bacterial panicle blight (BPB) and sheath blight (SB), caused by the bacteria Burkholderia glumae and B. gladioli, and the fungus Rhizoctonia solani, respectively, are two major rice diseases in southern rice growing regions of US. No completely resistant rice cultivars have been identified for …
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Tissue culture and transformation of introducing genes useful for pest management in rice
Sheath blight (SB), caused by Rhizoctonia solani K¨¹hn, is a major rice disease internationally and in the southern rice area of the Unites States, including Louisiana. Breeders have incorporated partial resistance into commercial rice varieties to control the disease, but a higher level of …
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Molecular diversity and coat protein expression of Sweet potato leaf curl virus
Leaf curl virus diseases have been reported in sweetpotato throughout the world. One of the causal agents is Sweet potato leaf curl virus (SPLCV) which belongs to the genus Begomovirus (family Geminiviridae). In the United States, SPLCV has been found infecting an ornamental sweetpotato and several …
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Effects of Corn (Zea mays L.) Stover Removal and Leaching on Soil Test and Whole Plant K Levels in Corn and K Fertilization/High-Input Treatments on Soybean Using Site-Specific Management to Increase Soybean (Glycine max) Production in South Dakota
<p>Potassium is important for crop production. Corn stover removal has the potential to reduce exchangeable and soluble soil potassium (K+) needed for optimal plant growth in addition to grain yield. An experiment was conducted in Aurora, SD, USA, to observe the effects of corn stover removal on …
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Enhancing photosynthetic capacity and energy conversion in wheat
Wheat is one of the major grain crops worldwide and provides approximately 20% of the total caloric and protein input for the world’s population. An increase in crop yields is required to meet the demands of the increasing world population in a challenging scenario of less predictable climatic …
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Remote sensing-based assessment of Gross Primary Production (GPP) in agricultural ecosystems
… of total carbon assimilated by the planted crops and the driver of useful biomass production. To assess the GPP of croplands, this study combines information from flux determinations with eddy covariance (EC) methodology, process-based modeling of carbon gain, and satellite remotely-sensed …
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An efficient process to designing robotic end effectors for high value crops: Application on robotic apple fruitlet thinning
High value crops continue to rely extensively on manual labour for labour intensive and expensive tasks like harvesting and thinning. Robotics is increasingly being investigated as a solution to combat labour shortages which threaten the sustainability and growth of the horticultural sector. …
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Three essays on rural development
… The last chapter builds a bridge between the crop physiology literature and the econometric estimation of the effects of climate change on agriculture. We build a simplified agronomic model that links changes in temperature and precipitation to the productivity of coffee. The insights from …
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Deficit Irrigation Strategies on young orange trees (cv Tarocco Sciara)
… irrigation, supplying 50-100% IR, depending on crop phenological phases and (iv) Surface drip irrigation, supplying 100% IR. The IR was calculated using the Penman-Monteith approach, by assuming a crop coefficient of 0.45, and correction coefficients accounting for the localized irrigation. On …
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Effect of temperature and daylength on the phenological development of oats (Avena sativa L.)
… anthesis and grain-filling which contribute to crop yield and quality. The objective of the research presented in this thesis was to investigate the influence of temperature and daylength on the phenological development of oats. The study was based on two approaches. The first was the …