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 24 for “"non-photochemical quenching"”.
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Multi-omic profiling of NPQ improved nicotiana tabacum lines under uniform light conditions
Non-photochemical quenching (NPQ) is an essential process protecting plants from oxidative damage under high light conditions. During the transition from light to shade, photosynthesis is briefly limited based on the rate of NPQ relaxation. Increasing expression of NPQ mediating proteins (VDE, ZEP, …
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Acclimation of marine macrophytes (Saccharina latissima and Zostera marina) to water flow
… in low-flow grown S. latissima increased non-photochemical quenching, thus reducing photodamage when photosynthesis was limited by DIC uptake. Water flow also affected root length in Z. marina but root length and below ground biomass were also significantly affected by sediment type, an …
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From the ice to the open ocean : threats to phytoplankton productivity in the Antarctic marine ecosystem from a changing climate
… and strong irradiance-dependent induction of non-photochemical quenching that was independent of protein resynthesis (Publication IV). The remaining chapters investigated photoprotective strategies and photosynthetic plasticity of phytoplankton under nutrient limitation. Nitrogen depletion in …
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Physiological effects of BA and ABA on caixin seedlings
… of chlorophylls and carotenoids, and photochemical quenching of BA-grown seedlings were higher than control- and ABA-grown seedlings. Non-photochemical quenching (NPQ) of ABA-grown seedlings was higher than control- and BA-grown seedlings. Heat-stressed (45 °C, 15 min) ABA-grown …
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Excitation evolution and self-regulation ability of photosynthetic light-harvesting systems /
… conditions. These mechanisms, known as non-photochemical quenching, allow plants to efficiently function at both low and high illumination levels. Based on the known molecular structure of the major light-harvesting complexes (LHCII), the efficiency of different carotenoid pigments in …
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Sužadinimo evoliucija ir savireguliacijos geba fotosintetinėse šviesą surenkančiose sistemose /
… conditions. These mechanisms, known as non-photochemical quenching, allow plants to efficiently function at both low and high illumination levels. Based on the known molecular structure of the major light-harvesting complexes (LHCII), the efficiency of different carotenoid pigments in …
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Variations in modelled and measured hyperspectral remote sensing reflectance
… irradiances allowed the onset of adaptive non-photochemical quenching to be monitored in situ.
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Growth, photophysiology and photosynthesis of two marine diatoms grown under predictable intra-diel light fluctuations
… transport rates (ETR) and the capacity for non-photochemical quenching (NPQ) all increased from SI to HF cultures. In both species increasing light fluctuation amplitude reduced growth rate. This reduction was greater for T. pseudonana than P. tricornutum. In HF cultures growth rates were …
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Light energy management in peach: utilization, photoprotection , photodamage and recovery. Maximizing light absorption in orchard is not always the best solution
… machine able to dissipate the energy excess quenching heat (Non Photochemical Quenching), moving electrons (water-water cycle , cyclic transport around PSI, glutathione-ascorbate cycle and photorespiration) and scavenging the generated reactive species. The price plants must pay for this …
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OPTIMIZING PHOTOSYNTHESIS IN BARLEY TO INCREASE BIOMASS AND GRAIN YIELD
… attivazione e disattivazione delle cinetiche del Non-photochemical quenching (NPQ), il componente più rapido della fotoprotezione, migliora la risposta alle fluttuazioni luminose, riducendo così le perdite energetiche. Con questo lavoro di tesi, è stata esplorata la variabilità genetica …
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Photoprotection and chloroplast regulation in the green algae Chlamydomonas reinhardtii
… light harvesting, are collectively measured as non-photochemical quenching (NPQ) of chlorophyll fluorescence. The major components of NPQ are thermal dissipation of excess light energy (excitation dependent quenching, qE), the migration of antenna complexes from PSII to PSI (state transitions, …
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Potential Impacts of Climate Change on Photochemistry of <i>Zostera Marina</i> L.
… the long-term impacts of ocean acidification on photochemical control mechanisms that promote photosynthesis while simultaneously protecting eelgrass from photodamage. Eelgrass were grown in controlled outdoor aquarium tanks at different aqueous CO<sub>2</sub> concentrations ranging from ~50 to …
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Hydrogen peroxide from photosynthesis: Theory and experiments linking elevated atmospheric CO2 with C3 plant chemical defense
… holds that elevated CO2 relaxes the induction of non-photochemical quenching during exposure to excess light, causing more excess excitation energy to enter the photosynthetic electron transport chain than under ambient CO2. In principle, this excess of energy would have nowhere to go except …
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Variability of phytoplankton production rates in the Atlantic Ocean as observed using the Fast Repetition Rate Fluorometer
… changes in PSII pigments indicating non-photochemical quenching of excess solar energy as part of a diel rhythm in cellular constituents. A novel calculation for the number of <i>in situ</i> PSII reaction centres (n<sub>PSII</sub>), based on FRRF measurements, is described and tested …
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Fluorescence lifetime-resolved imaging microscopy studies: quantitative image analysis, spectral-FLIM, and photosynthesis
… the Chl a signals undergoing two different non-photochemical quenching pathways, energy-dependent quenching and state transitions. Spectral-FLIM measurements of avocado leaves (Persea americana Mill.) during the slow phase of Chl a fluorescence transient were also carried out. The data show …
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Optimizing electrogenic activity from photosynthetic bacteria in bioelectrochemical systems
… efficiency to EET in Synechocystis. Non-photochemical quenching (NPQ) was investigated as a limiting factor in biophotovoltaic efficiency and was found to be reduced in the PBS antenna-truncated mutants. Fluorescence and electrochemical data were combined to develop a framework for …
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Unraveling the gene regulators and molecular mechanisms underlying the elevated CO2 response in C3 plants
… efficiency can be improved by accelerating nonphotochemical quenching under fluctuating light conditions. In Chapter 4, the transcriptional response of a transgenic soybean line expressing the AtVPZ cassette—which accelerates non-photochemical quenching (NPQ) relaxation—was evaluated under …
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Characterising natural genetic variation in dynamic photosynthesis and photoprotection in sorghum
Non-photochemical quenching (NPQ) photoprotective processes are key for protecting photosynthetic machinery from excess light energy. Improving the regulation of NPQ in leaves during dynamic light conditions has been identified as a potential route toward increasing photosynthetic efficiency in the …
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A METE mutant of Chlamydomonas reinhardtii provides new perspectives on the evolution of vitamin B12 auxotrophy
… the observation that there was no induction of non-photochemical quenching, unlike under nitrogen deprivation. The metabolite S-adenosyl homocysteine, a potent inhibitor of methylation, increased substantially during B12 deprivation, as did the transcripts for several enzymes of one-carbon …
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The Evolution of Photosystem II Subunit S across the Green Lineage
… as fluorescence or be dissipated as heat (non-photochemical quenching, NPQ). When light levels are too high, NPQ is an important protective process that prevents damage to membranes and proteins in the chloroplast. In vascular plants, the major trigger of fast-inducing energy-dependent NPQ …
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