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.
Results
Showing 1 to 20 of 25 for “"co2 assimilation"”.
-
Effect of Ozone on CO2 Assimilation and PSII Function in Plants with Contrasting Pollutant Sensitivities
… concentrations (under field conditions) on net CO2 assimilation and PSII function in plants with different sensitivities to ozone. Two species of plants, tobacco (Nicotiana tabacum L.) and black cherry (Prunus serotina) were studied. Gas exchange analysis and chlorophyll fluorometry were …
-
The maximum quantum efficiency of CO2 assimilation declines with depth in the canopies of the C4 crops Miscanthus x giganteus and Zea mays
Leakage of CO2 from bundle sheath cells of C4 plants (φ) could limit their productivity. φ is thought to increase at low light in the C4 crop Miscanthus x giganteus (M. x giganteus) (Kromdijk et al., 2008). This should reduce photosynthetic light use efficiency (PLUE) in the lower canopy. Zea mays …
-
Capturing Photosynthetic Traits from the Progenitors of Wheat
… characteristics that facilitated the supply of CO2 to the sites of carboxylation, including high stomatal and mesophyll conductance. Progeny formed through tetraploid and hexaploid crossing carried introgressions from these T. dicoccoides and were screened in a subsequent field trial. Although …
-
Characterising four Cowpea (Vigna unguiculata (L.) Walp.) Mozambican landraces deposited in a seed bank for drought tolerance
… also maintained high rates of photosynthetic CO2 assimilation when exposed to drought and used better assimilated carbon to generate biomass than the other tested cowpea landraces. Protein and chlorophyll degradation was further less affected and had only a slight increase in proteolytic …
-
Strategies to improve C4 photosynthesis, water and resource-use efficiency under different atmospheres, temperatures, and light environments
… activity to improve C4 photosynthetic CO2 assimilation are examined. In Chapters 4-7, the relationship of C4 photosynthetic CO2 assimilation with water loss through transpiration is examined, along with how this tradeoff could be improved. Photosynthesis depends on a suite of …
-
Exploiting the Productivity of C4 Photosynthesis in Cool Temperate Climates: Mechanisms and Thresholds of Cold Tolerance in Miscanthus, Saccharum, and Spartina pectinata
… associated with chilling sensitivity of net CO2 assimilation rate. Next, a more detailed investigation comparing M. x giganteus with the most chilling sensitive Miscanthus hybrid reveals Rubisco is the predominant limitation on net CO2 assimilation rate at cooler temperatures. Finally, this …
-
Änderung der Glycindecarboxylase- und Serinhydroxymethyltransferase-Aktivität in Blättern:
… Kompartimentierung der photorespiratorischen CO2-Freisetzung aus Glycin in den Bündelscheidenzellen vermindert. Dieser CO2-Konzentrierungsmechanismus beruht auf der ausschließlichen Kompartimentierung der Glycindecarboxylase (GDC)-Aktivität in den Bündelscheidenzellen der Blätter. Die …
-
Intraspecific, Interspecific, and Seasonal Variation in Acclimation of Photosynthesis to Rising Atmospheric Carbon Dioxide Concentration
… 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 grassland …
-
Morphological and Physiological Studies of the Carbon Concentrating Mechanism in Chlamydomonas reinhardtii
… reinhardtii possesses a single-cell-based CO2-concentrating mechanism (CCM). The CCM is an important element of algal photosynthesis, metabolism, growth and biomass production, which works by increasing the concentration of inorganic carbon (Ci) in the pyrenoid, a dense RuBisCO-packed …
-
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 …
-
Heterogeneity of Leaf-Level Photosynthesis as Seen Through the Lens of Ozone, Soybean, and Chlorophyll Fluorescence Imaging
Leaf-level heterogeneity of photosynthetic CO2 assimilation occurs naturally in plants under stressed and non-stressed conditions and has been attributed in the past to stomatal heterogeneity. Variation in the biochemistry of mesophyll cells has been cited as another potential cause of …
-
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 …
-
Analysis of the Potential for Diazotrophic Endophytes to Increase Efficiency of Bioenergy Crop Production: Growth promotion effects of the endophytes isolated from Populus trichocarpa and Salix sitchensis
… however, consistently higher rates of net CO2 assimilation was observed as a result of cross species endophyte inoculations. Additionally, phenotypic plasticity in biomass allocation and branch production as a result of endophyte inoculations were observed and may be useful in bioenergy …
-
Evaluation of the photoprotective role of quercetin to selected light-adapted and shade-tolerant plant species
… at high light intensity is not due to high CO2 assimilation rate, but rather due to the production of photoprotective metabolites to conquer the light stress.
-
Cool Temperature Effects on Productivity and Photosynthesis of Two Biomass Fuel Species: Switchgrass (Panicum virgatum) and Miscanthus (Miscanthus x giganteus)
… both carboxylation efficiency and the ratio of CO2 assimilation to electron transport (Asat/Jmax). These results indicate that PPDK may pose a significant limitation to C4 photosynthesis in cool conditions and there is a possibility that cold season photosynthesis of switchgrass cv. Alamo could …
-
Sources and sinks of selected trace gases in the tropospheric boundary layer of the eastern United States
… pine forest grown under ambient and elevated CO2 were examined in the third study. Vegetative consumption dominated net ecosystem COS uptake (10 to 40 pmol m-2 s-1) under both CO2 regimes. Environmental controls over vegetation stomatal conductance and photosynthetic capacity were the major …
-
Improved Temperature Response Functions for Modeling Photosynthetic Carbon Assimilation in the Context of Rising Carbon Dioxide
… has been inability to predict accurately carbon assimilation over an ecologically significant range of temperatures. The previous parameters were based on in vitro measurements made over a limited temperature range and require several assumptions of in vivo conditions. Inaccuracies in the …
-
Untersuchungen zur genetischen Regulation der CO<sub>2</sub>-Assimilation in <i>Ralstonia</i> spp.
Die autotrophe CO2-Assimilation erfolgt in Ralstonia eutropha H16 und Ralstonia metallidurans CH34 über den des Calvin-Benson-Bassham (CBB) Cyclus. Die Expression der beiden hoch homologen cbb-Operone cbbc und cbbp in R. eutropha H16 wird in erster Linie durch den LysR-Typ-Transkriptionsregulator …
-
Stomatal sensitivity to photosynthetic and environmental signals in glycine max grown at elevated atmospheric concentrations of CO2 and O3
… atmospheric concentrations of carbon dioxide (CO2) and ozone (O3) will stimulate and impair, respectively, yield and productivity of both managed and natural ecosystems in the 21st century. The ease of diffusion of these gases, as well as water vapor, between the atmosphere and interior of …
-
Engineering a Reverse C4 Photosynthetic Pathway in C3 species Arabidopsis thaliana
… background with less RuBisCO showed lower CO2 assimilation. Genes for a reverse NAD-ME C4 pathway were assembled into two large multigene constructs containing 9 and 10 transcription units. Homozygous lines carrying each construct were obtained and showed overexpression of most transgenes. …
Page 1 of 2