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Full-Text Articles in Plant Sciences
Field Evaluation Of Tobacco Engineered For High Leaf-Oil Accumulation, James Perry
Field Evaluation Of Tobacco Engineered For High Leaf-Oil Accumulation, James Perry
Theses and Dissertations--Plant and Soil Sciences
The biofuel market is dominated by ethanol and biodiesel derived from cellulosic and lipid-based biomass crops. This is largely due to the relatively low costs and reliability of production. At present, production of non-food plant-derived oils for biofuel production in the U.S. is minimal. A research team from the Commonwealth Scientific and Industrial Research Organization (CSIRO), an independent Australian federal government research institution, has developed an efficient transgenic system to engineer oil production in tobacco leaves. This novel system is comprised of multiple transgenes that direct the endogenous metabolic flux of oil precursors towards triacylglycerol (TAG) production. Additional genes were …
Chemical Topping Burley Tobacco, Mitchell D. Richmond
Chemical Topping Burley Tobacco, Mitchell D. Richmond
Theses and Dissertations--Plant and Soil Sciences
The act of topping tobacco (Nicotiana tabacum L.) involves the removal of the terminal bud or inflorescence of the tobacco plant. This practice ordinarily is accomplished by manually removing the top of each tobacco plant in an entire field which is labor intensive and costly. Chemical topping utilizes sucker control products to inhibit the terminal bud and axillary bud growth without manually removing the top of the tobacco plant. There were several research objectives in order to determine the utility of a chemical topping system: 1) determine if burley tobacco could be chemically topped with currently registered suckercide products …
Using Exogenous Hormone Application To Suppress Axillary Shoot Development In Tobacco, W. Jesse Carmack
Using Exogenous Hormone Application To Suppress Axillary Shoot Development In Tobacco, W. Jesse Carmack
Theses and Dissertations--Plant and Soil Sciences
The variability in the number of basal axillary shoots (ground suckers) among all tobacco (Nicotiana tabacum L.) varieties, has increased since the hydroponic transplant production system became the standard. The larger root ball of hydroponically produced transplants compared to traditionally produced transplants potentially generates a difference in the ratio of auxin (inhibits axillary shoot formation) to cytokinin (promotes lateral branching), that induces basal axillary shoot development. Starting in 2014, studies were conducted to investigate whether the addition of synthetic auxins or cytokinins to hydroponic transplant production could prevent ground sucker formation. Different tobacco cultivars, with high or low ground sucker …
Field Evaluation Of Burley Lines Containing Alleles Minimizing Nicotine To Nornicotine Conversion, Cameron G. Shelton
Field Evaluation Of Burley Lines Containing Alleles Minimizing Nicotine To Nornicotine Conversion, Cameron G. Shelton
Theses and Dissertations--Plant and Soil Sciences
CYP82e4, CYP82e5, and CYP82e10 mutant alleles that minimize the conversion of nicotine to nornicotine have been introgressed into numerous existing low converting (LC) burley varieties and parental lines developed by the Kentucky-Tennessee tobacco breeding program. A backcross breeding protocol was utilized, with the objective being the creation of "e3" varieties that differed from their LC counterparts only for nornicotine and nitroso-nornicotine content. Field studies were conducted in Kentucky and Tennessee during the 2013 growing season, with 17 prospective parental lines and 20 prospective commercial varieties grown and compared to their original counterparts. Most of the e3 lines were not morphologically …
Soil Management And Nitrogen Dynamics In Burley Tobacco Rotations, Congming Zou
Soil Management And Nitrogen Dynamics In Burley Tobacco Rotations, Congming Zou
Theses and Dissertations--Plant and Soil Sciences
Agronomic practices, including tillage, crop rotation and N fertilization, have been developed to efficiently manage soil N dynamics and crop N nutrition. These practices can affect soil organic carbon (SOC) and soil total nitrogen (STN) sequestration, and consequently influence soil nitrogen mineralization (SNM) and crop N nutrition. However, little research has been systematically and simultaneously conducted to examine the effect of agronomic management on (1) SOC and STN stocks; (2) SNM; and (3) crop N nutrition. Burley tobacco (Nicotiana tobacum L.) is a N demanding crop and subject to inefficiency in N fertilization. Moreover, conservation tillage and rotation have been …