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 14 of 14 for “"photochemical efficiency"”.
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Influences of elevated atmospheric CO₂ and water stress on photosynthesis and fluorescence of loblolly pine, red maple, and sweetgum
… CO₂ showed signs of photosynthetic acclimation. Photochemical efficiency of PSII declined with water stress in loblolly pine. Red maple and sweetgum showed no relationship between photochemical efficiency of PSII and simulated drought. Growth in elevated C0₂ did not influence this response in …
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The Use of Plant Growth Regulators to Improve the Traffic Tolerance and Repair of Overseeded Bermudagrass
… tiller density, delay of senescence and enhanced photochemical efficiency. For these reasons, the application of cytokinin enhancing PGRs may have potential to increase bermudagrass traffic tolerance. Patriot's aggressive growth and excellent cold hardiness are predicted to result in better …
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The photoprotective role of thermonastic leaf movements in Rhododendron maximum: potential implications to early spring carbon gain
… leaves began to return to normal levels of photochemical efficiency and treatment leaves sustained low Fv/Fm. Net photosynthesis was lower for treatment leaves than reference leaves. This became most significant during the early spring, when maximum carbon gain is possible. Finally, gas …
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Study of Thermotolerance Mechanism in Gossypium Hirsutum Through Identification of Heat Stress Genes
… treatment. No obvious differences were found in photochemical efficiency of PSII in the four lines. However, heat susceptible cultivars show greater membrane leakage after heat treatment as compared to the heat tolerant lines. This work suggests that early induction of heat stress tolerance genes …
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Local Adaptation Signatures in Thermal Performance of the Temperate Coral Astrangia poculata
… (P), respiration (R), and symbiont photochemical efficiency (F<sub>v</sub>/F<sub>m</sub>) were measured. Thermal performance curves (TPCs) of respiration revealed differences consistent with local adaptation of the RI and VA populations to their natal thermal environments. RI corals …
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Investigating the photosynthesis of Symbiodinium in Caribbean gorgonian corals
… The four octocoral species exhibited similar photochemical efficiencies despite significant differences in Symbiodinium density, chlorophyll a per cell, light absorption by chlorophyll a, and rates of photosynthetic oxygen evolution. Differences in photosynthetic performance between octocoral …
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Impact of Air Quality on Lichen Net Carbon Uptake and Structural Organization With Attention to the Role of Photoinhibition
… same lichen species were used to measure Fv/Fm, photochemical efficiency of photosystem II, by exposing them to high light intensity in both dry and wet state. Lichens revealed higher net carbon uptake and higher pigment content at polluted sites in comparison to a clean site in summer although …
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Physiological and Environmental Basis of Turfgrass and Weed Response to Mesotrione Formulations
… phytotoxicity with a concomitant decrease in photochemical efficiency when mesotrione was applied to foliage of smooth crabgrass (Digitaria ischaemum (Schreb.) Schreb. ex Muhl.). Furthermore, white tissue was found predominately in the two youngest leaves when mesotrione was applied to soil, …
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Assessing the risk of ocean acidification for scleractinian corals on the Great Barrier Reef
… hypothesised to impact Symbiodinium uptake and photochemical efficiency. We utilised the iPAM to align the photochemistry in the juveniles with their visual bleaching response and Symbiodnium type, as assessed by denaturing gradient gel electrophoresis (DGGE) of the internal transcribed spacer …
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Effect of O3 fumigation on photosynthesis and growth of quinoa and its interaction with drought and elevated CO2
… treated plants exhibited a marked decrease in photochemical efficiency, active photosystem II (PSII) reaction centres per leaf cross section and increase in non-photochemical dissipation. Drought-induced plants had higher fluorescence intensity at the J-phase compared to the well-watered …
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Effect of Ozone on CO2 Assimilation and PSII Function in Plants with Contrasting Pollutant Sensitivities
… the photosystem. Reductions in apparent quantum efficiency, calculated from the assimilation-light curve, differed between cultivars. Bel-B showed an immediate depression of 14% compared to controls, whereas Bel-W3 showed a 27% decline. Electron transport rate (ETR), at saturating light …
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Development of a new hybrid photochemical/electrocatalytic water splitting reactor for hydrogen production: design, analysis and experiments
… reactants is a hybrid system which combines photochemical and electro-catalytic reactions. The originality of this research lies in the engineering development of a novel photo-catalytic water splitting reactor for sustainable hydrogen production, and verification of new methods to enhance …
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Thermo and drought tolerance markers and regulation of heat stress proteins for chickpea (Cicer arietinum L.; Fabaceae) production in NE South Africa
Chickpea (Cicer arietinum) is an important legume crop globally ranked third after dry bean (Phaseolus vulgaris) and field pea (Pisum sativum). It constitutes 20% of the total global pulse production and around 95% of its production and consumption takes place in developing countries. Major …
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The effect of environmental factors on the dynamics of bacterial populations associated with coral colonies and the implications for holobiont health
… tissues by 16S rRNA gene amplicon sequencing. Photochemical efficiency (FV/Fm) of symbiotic dinoflagellates within the corals declined above 31°C, suggesting that the corals were under thermal stress. Both the mucus and tissues of healthy A. muricata were dominated by γ-Proteobacteria, but …