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 “"NPQ"”.
-
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, …
-
The Evolution of Photosystem II Subunit S across the Green Lineage
… 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 is the Photosystem II subunit …
-
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 …
-
OPTIMIZING PHOTOSYNTHESIS IN BARLEY TO INCREASE BIOMASS AND GRAIN YIELD
… 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 indotta in orzo, un’importante …
-
Fluorescence Studies of Photosystem II Fluorescence Quenching During Desiccation
… hydrated conditions nonphotochemical quenching (NPQ) mechanisms are able to safely dissipate excess excitation energy as heat, but mechanisms of NPQ associated with desiccation tolerance are still largely unclear. In the lichen Parmelia sulcata, photosystem protection has been associated with an …
-
Physiological effects of BA and ABA on caixin seedlings
… 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 seedlings showed lowered Fv/Fm decrease and smaller NPQ increase, suggesting that ABA partially alleviated effects of heat …
-
Ion Transport in Chloroplasts with Role in Regulation of Photosynthesis
… that activates photoprotective mechanisms (NPQ) (Paper I). In Paper II, an Arabidopsis mutant named pam71 is found disturbed in photosystem II efficiency and the adjustment of PMF, due to altered Ca2+ homeostasis in the chloroplast. In Paper III, it is shown that the thylakoid phosphate …
-
Trocas gasosas e fluorescência da clorofila “a” em genótipos de cana-de-açúcar infestados por cigarrinha-das-raízes Mahanarva fimbriolata
… os rendimentos quânticos do FSII, [Y(II)], [Y(NPQ)] e [Y(NO)]. Para o genótipo SP81-3250, houve reduções significativas em todos os parâmetros de trocas gasosa e nos parâmetros de fluorescência. O rendimento do FSII [Y(II)] foi reduzido e o Y(NPQ) foi incrementado, sugerindo que o genótipo …
-
The Ancestry and Function of Cytochrome c6A
… established a link between cytochrome c6A and NPQ. As cytochrome c6A is believed to be located in the thylakoid lumen, and initial NPQ is triggered by a change in luminal pH, circular dichroism was used to determine changes in secondary structure of purified cytochrome c6A over a pH range of …
-
Growth, photophysiology and photosynthesis of two marine diatoms grown under predictable intra-diel light fluctuations
… 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 50% and 62% of those in SQ …
-
Regulation of the chloroplast light harvesting antenna by plastoquinone redox: Modulation of chlorophyll metabolism and thylakoid complex organization
… importance of a conformational state at PSII to NPQ. To investigate photosystem organization in response to irradiance stress the effect of high light on thylakoid complexes was scrutinized by native green gel electrophoresis. The formation of a novel high molecular weight complex in response to …
-
Photoprotection and chloroplast regulation in the green algae Chlamydomonas reinhardtii
… 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, qT) and inactivation of PSII …
-
The function of plant chloroplast redox systems in adaptation to light
… como la disipación de energía en forma de calor (NPQ, “non-photochemical quenching”), evitando una excesiva producción de ROS perjudicial para la planta (Muller et al., 2001; Szabo et al., 2005), proceso que podría tener un control redox mediado por Trxs. El objetivo central de este trabajo ha …
-
Aclimatação da maquinaria fotossintética do cafeeiro cultivado em diferentes níveis de luz e de disponibilidade hídrica
… O coeficiente de extinção não-fotoquímico (NPQ) não variou em resposta ao DH moderado, porém, sob DH severo, observaram-se reduções em NPQ. As plantas sob sombreamento mais intenso (70%), de modo geral, apresentaram maiores valores de concentrações de clorofilas (Cl) totais e da razão Cl a/b …
-
Exploring the Function of Cytochrome c6A
… of PSII was lower without c6A, and elevated NPQ levels suggested increased stress levels in the absence of c6A. These insights explain the observed growth penalty which could be caused by the altered light harvesting balance, leading to a more reduced PQ pool, and ultimately increased damage …
-
Extent and factors influencing research utilization among critical care nurses
… form of the Nursing Practice Questionnaire (NPQ) developed by Brett (1987) made specific to critical care. Questions following each nursing practice were designed to determine the nurse's stage in the innovation-decision process. The Research Factor Questionnaire (RFQ) was designed to elicit …
-
Optimizing electrogenic activity from photosynthetic bacteria in bioelectrochemical systems
… 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 quantifying the efficiency of …
-
Unraveling the gene regulators and molecular mechanisms underlying the elevated CO2 response in C3 plants
… accelerates non-photochemical quenching (NPQ) relaxation—was evaluated under ambient and elevated CO2 concentrations. Transcriptomic analysis revealed genotype-specific hormonal and stress responses, suggesting that AtVPZ expression alters growth and stress tolerance of the transgenic line …
-
Funciones del cloruro en la asimilación de nitrato y en la fotoquímica vegetal
… ?pH, induciendo el quenching no fotoquímico (NPQ), mecanismo que protege frente al exceso de energía lumínica y reduce el riesgo de fotodaño. Esta acidificación del lumen tilacoidal contribuyó a una mayor disipación de energía en forma de calor. A pesar de la reducción en Y[II], el tratamiento …
-
Ultraviolet radiation and aquatic bryophytes: physiological damage and protection mechanisms under laboratory and field conditions
… fluorescencia de clorofilas (Fv/Fm, ¿PSII, ETR, NPQ, y Performance Index), CAUV solubles e insolubles (tanto globalmente como individualmente), y daño al ADN (cantidad de dímeros de timina). 3) Aplicando distintas condiciones experimentales: suplemento de UV-B en el laboratorio vs. niveles …
Page 1 of 2