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 20 of 76 for “"Elevated CO2"”.
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Regulatory mechanisms underlying C3 carbon and nitrogen metabolism under elevated CO2
Rising atmospheric CO2 concentration will affect species-specific responses to carbon (C) gain in plants, in turn impacting plant productivity in natural and agro-ecosystems in the future. Several interacting environmental and genetic factors affect species-specific response to C gain under …
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Unraveling the gene regulators and molecular mechanisms underlying the elevated CO2 response in C3 plants
Rising atmospheric carbon dioxide ([CO2]) concentrations, a major driver of climate change, also present a unique opportunity to enhance crop productivity, particularly in C3 plants. However, the extent of this CO2 fertilization effect is modulated by complex interactions with nutrient …
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The effects of elevated CO2 and ocean acidification on the production of marine biogenic trace gases
… investigate the relationship between increasing pCO2, decreasing pH and changes in volatile dimethylsulphide (DMS) and halocarbon concentrations, through 70,000 litre, high pCO2 mesocosm experiments and laboratory culture studies. DMS is a climatically important trace gas produced by marine algae: …
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Will Nitrogen fixers benefit from rising Atmospheric CO2? The response of Podalyria Sericea to elevated CO2
… and ecosystems to rising levels of atmospheric CO2, the response of individual plants under natural conditions needs to be determined. Podalyria sericea, a fynbos legume, was grown in a greenhouse under ambient (35 Pa) and elevated (70 Pa) CO2 partial pressure for 18 months. Growth, leaf 615N …
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The role of environment, sink capacity, and carbon translocation in determining C3 plant responses to elevated [CO2]
Over the past century, CO2 concentration ([CO2]) in the atmosphere has been steadily increasing, leading to global climate change. Elevated [CO2] increases yield, biomass, and photosynthesis in most C3 plants, but the degree to which elevated [CO2] stimulates crop yields can depend upon climatic …
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Effect of O3 fumigation on photosynthesis and growth of quinoa and its interaction with drought and elevated CO2
… and agriculture. The effects of water stress and elevated levels of O3 and CO2 were investigated on Chenopodium quinoa Willd. The physiological response of quinoa was evaluated by subjecting quinoa to severe drought (10% field capacity), moderate drought (20% field capacity), watered (75% field …
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Impacts of heat waves on food quantity and quality of soy bean/corn in the Midwest at ambient and elevated [CO2]
… Heat wave treatments were replicated at ambient CO2¬ concentrations (400 ppm, aCO2) and concentrations projected for the year 2050 (600 ppm, eCO¬2). This experiment aimed to discover whether or not eCO¬2 and heat wave treatments would interact synergistically to improve seed quality and quantity. …
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Impacts of climate change on herbivore induced plant signaling and defenses
The accumulation of CO2 and O3 in the troposphere alters phytochemistry which in turn influences the interactions between plants and insects. To examine the effect of elevated atmospheric CO2 and O3 concentrations on plant-insect interaction, I measured changes in transcription using microarray …
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Interactive effects of elevated carbon dioxide concentration and water availability on field-grown soybean (Glycine max)
The concentration of carbon dioxide ([CO2]) in the atmosphere is predicted to reach 730 – 1020 parts per million (ppm) by 2100, and the risk of drought is predicted to increase. Elevated atmospheric [CO2] directly affects C3 plants by reducing stomatal conductance (gs) and increasing photosynthetic …
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Direct and Indirect Effects of Elevated Carbon Dioxide and Ozone on the Canopy of a Soybean Agroecosystem
It is unknown how rising atmospheric CO2 and O3 will directly and indirectly alter canopy structure and scale to affect ecosystems. I determined how leaf area index (LAI) was directly affected by elevated [CO 2] and [O3]. By increasing photosynthetic efficiency, elevated [CO2] may increase maximum …
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Growth of Understory Saplings in a Forest Exposed to Elevated Carbon Dioxide
… will likely be affected by rising atmospheric CO2. The growth response of different tree species varies and depends upon characteristics that enable response to CO2 concentration. The relationship between the sources (e.g., leaves) and sinks (e.g., new, developing leaves and roots) has been …
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Intraspecific, Interspecific, and Seasonal Variation in Acclimation of Photosynthesis to Rising Atmospheric Carbon Dioxide Concentration
… influence acclimation of photosynthesis to elevated [CO2]. Variation in acclimation was addressed using meta-analytical techniques and three open-air CO 2 experiments: a Free Air CO2 Enrichment (FACE) experiment with Glycine max (SoyFACE); a FACE experiment with Lolium perenne, a temperate …
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Hydrogen peroxide from photosynthesis: Theory and experiments linking elevated atmospheric CO2 with C3 plant chemical defense
Elevated atmospheric CO2 alters C3 plant chemical defense for reasons that remain unclear. To explain the influence of elevated CO2 on plant chemical defense, this dissertation proposes, then tests, the hypotheses that: 1. C3 plant chloroplasts exert control over chemical defense against biotic …
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Indirect Effects of Elevated Carbon Dioxide on Members of Three Herbivorous Feeding Guilds on Soybean, Glycine Max
P. japonica prefers damaged leaves grown under elevated CO2 over damaged leaves grown under ambient CO2, which may be the result of increased complexity in volatile compounds in leaves grown under elevated CO2. Increased amounts of flavonols and decreased amounts of isoflavonoids in leaves grown …
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Elevated Atmospheric Carbon Dioxide and Ozone Concentrations Alter Leaf Area Index Through Changes in Leaf Production and Expansion
This research has shown that although elevated [CO2] increased LAI in aspen and soybean, the mechanisms for the change differed between the species. Leaf number was increased by elevated [CO2] in aspen, whereas individual leaf size was increased in soybean. Aspen and soybean had similar responses …
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Soybean Responses to Atmospheric Increases in Carbon Dioxide and Ozone
Atmospheric concentration of carbon dioxide (CO2) has been increasing steadily since the industrial revolution and is expected to double by the middle of this century. Ozone (O3), a secondary air pollutant, has become an issue in the last decades for its damaging effects on humans as well on …
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Impacts of global warming and rising atmospheric CO2 concentrations on physiology, development and productivity of Midwestern crops
… greenhouse gases in the atmosphere, particularly CO2, drives increases in the global surface temperatures and is already impacting life on Earth. The impact of these changes on agro-ecosystem is particularly important as we rely on agriculture for food, fiber, and renewable energy, the demand for …
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Interactive effects of elevated carbon dioxide concentration with nutrient availability and leaf development on plant carbon metabolism
… balance between photosynthetic carbon dioxide (CO2) assimilation and respiratory CO2 release influence plant growth, crop yields, and the ability of terrestrial ecosystems to offset ~2-3 Gt CO2 yr -1 of anthropogenic emissions. Rising atmospheric CO2 concentration ([CO2]) this century will …
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The Evolutionary Ecology of Arabidopsis Thaliana: Genotypic Diversity, Herbivory, and Elevated Carbon Dioxide
In this study, I evaluated the impact of elevated CO2 and insect herbivory on the genotypic response of Arabidopsis thaliana . I performed greenhouse and field experiments to examine plant ecological traits related to life history, fitness, and resistance and their variation under different abiotic …
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