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Showing 1 to 20 of 22 for “"Photosystem II (PSII)"”.
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Experimental and theoretical studies of the photosystem II reaction center: Implications for bicarbonate binding and function
… arginine residues in bicarbonate binding in the photosystem II (PSII) reaction center, arginines 257 and 269 of the D1 polypeptide (D1-R257 and D1-R269) near the putative bicarbonate binding sites, the non-heme iron and the Q$\sb{\rm B}$ binding niche, were mutated in a unicellular green alga …
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Effects of amino acid residue substitutions on bicarbonate function in the plastoquinone reductase in cyanobacteria
… Thus, this effect is present in all Photosystem II (PSII) reaction centers.
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High Light and Low Temperature Effect on D1 Synthesis and Turnover in the Chilling Sensitive Plant Lycopersicun Esculentum
… in de novo synthesis of D1, a component of photosystem II (PSII) reaction center which is known to be damaged by high light. The decrease in D1 synthesis was not due to changes in the steady state level of psbA, D1 message. An increase in psbA mRNA association with ribosomes along with …
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Action of Allelochemicals on Algal Growth and Photosystem Ii Efficiency
… was tested on unicellular algal growth and photosystem II (PSII) efficiency. Chlorella pyrenoidosa Chick and Selenastrum capricornutum Printz were the bioassay species. Fourteen of the 15 allelochemicals investigated resulted in a significant decrease in C. pyrenoidosa growth; 7 caused more …
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Utilising Chlorophyll Fluorescence to Assess the Variability of Phytoplankton Biomass and Productivity in the North-West European Shelf Seas
… rate fluorometry (FRRf) measurements of photosystem II (PSII) characteristics during a spring bloom were shown to change with hydrography and community composition. Thus, providing further support that the physiological state of PSII can be used as an indicator of bloom status and …
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Computational Insights Into The Oxygen Evolving Complex Of Photosystem ΙΙ
<p>The Oxygen Evolving Complex (OEC) of Photosystem II (PSII) is a unique Mn4O5Ca2+ cluster that catalyzes the photoactivated water splitting reaction. The OEC is a model system for bio-inspired artificial systems to use solar energy to pull electrons from water to produce fuel. The OEC goes …
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Multiple Herbicide Resistance in Waterhemp
… that plants were also resistant to atrazine, a photosystem II (PSII)-inhibiting herbicide. A waterhemp line selected for multiple herbicide resistance, designated R biotype, was compared in all experiments to a herbicide-susceptible (S) biotype in order to characterize resistance to ALS, PSII, …
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An Investigation of Plant Hypersensitive Response and Photosynthesis Inhibition on a Genomic and Physiological Scale
… global gene expression of plants treated with photosystem II (PSII) inhibiting herbicides, atrazine and bentazon, (2) examining protein expression of the PSII reaction center subunit D1 in leaves infected with the bacterial pathogen Pseudomonas syringae, (3) analyzing the effect of the PSII …
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The maximum quantum efficiency of CO2 assimilation declines with depth in the canopies of the C4 crops Miscanthus x giganteus and Zea mays
… addition, dark-adapted maximum quantum yield of photosystem II (PSII; ΦPSII, max), operating yields of CO2 assimilation (ΦCO2), and PSII photochemistry (ΦPSII) were determined. These allowed calculation and analysis of electron transport rate (J) and the proportion of maximal PSII capability used …
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Use of Protein Crosslinking and Tandem Mass Spectrometry to Study the PsbO, PsbP and PsbQ Extrinsic Proteins of Higher Plant Photosystem II
Photosystem II (PSII) is a light-driven, water plastoquinone oxidoreductase present in all oxygenic photosynthetic organisms. The oxygen evolution process is catalyzed by the Mn4CaO5 cluster and an ensemble of intrinsic and extrinsic proteins which are associated with the photosystem. This metal …
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Towards reverse engineering of Photosystem II: Synergistic Computational and Experimental Approaches
ABSTRACT Photosystem II (PSII) of oxygenic photosynthesis has the unique ability to photochemically oxidize water, extracting electrons from water to result in the evolution of oxygen gas while depositing these electrons to the rest of the photosynthetic machinery which in turn reduces CO2 to …
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Characterization of a novel five-way-resistant population of waterhemp (Amaranthus tuberculatus)
… oxidase (PPO), TIR1 auxin receptor, Photosystem II (PSII), and 4-hydroxyphenylpyruvate dioxygenase (HPPD). In 2012, a grower reported the failure to control a waterhemp population in conventional white corn with topramezone, an HPPD inhibitor. Records indicate the field had been …
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Understanding the Interaction of Mesotrione and Atrazine in Redroot Pigweed (Amaranthus Retroflexus)
… atrazine directly inhibits photosynthesis at photosystem II (PSII), mesotrione leads to the depletion of plastoquinone, a carrier molecule required to shuttle electrons from PSII, and carotenoids and tocopherols, which are antioxidants that protect from damage from excess energy evolving from …
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The photophysiology and primary productivity of phytoplankton within the deep chlorophyll maximum
… effective absorption cross section of photosystem II (?PSII) and photosynthetic efficiency (Fv/Fm) co-varied with pigment composition, and did not appear to contribute to photo-acclimation. Data indicated that the mechanism of photo-acclimation was by the number, rather than size, of …
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Variability of phytoplankton production rates in the Atlantic Ocean as observed using the Fast Repetition Rate Fluorometer
… the functional absorption cross section (σ<sub>PSII</sub>) and the quantum yield of photochemistry (F<sub>v</sub>/F<sub>m</sub> which relate to the rate at which photosystem II (PSII) saturates with light and the proportion of functional PSII reaction centres, respectively. Changes in both …
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Characterization of HPPD-inhibitor resistance in waterhemp (Amaranthus tuberculatus)
… to acetolactate synthase (ALS) inhibitors and photosystem II (PSII) inhibitors, while glyphosate, glufosinate, and protoporphyrinogen oxidase (PPO) inhibitors generally provide the greatest control of this population. Chapter 4 discusses the efficacy of various soil-applied residual herbicides …
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Effect of O3 fumigation on photosynthesis and growth of quinoa and its interaction with drought and elevated CO2
… 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 plants, indicating a decrease in the …
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Biologically inspired materials for electro-responsive coatings and the photo-oxidation of water
… system for water oxidation was developed using photosystem II (PSII) as a model. Proteins form the structural scaffold for PSII, assembling dye molecules as well as the metal-oxo catalytic center; furthermore, peptides play an active role in shuttling charge throughout PSIL. The D1 peptide in …
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Proteomics Assisted Discovery Of Novel Proteins In Assembly And Regulation Of Photosystem II
… under 33 different environmental conditions. Photosystem II: PSII) is a large membrane protein complex that performs the water oxidation reactions of the photosynthetic electron transport chain in cyanobacteria, algae, and plants. Subsequently, we also performed an accurate mass tag: AMT) …
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Molecular mechanisms behind the adjustment of phototrophic light-harvesting and mixotrophic utilization of cellulosic carbon sources in Chlamydomonas reinhardtii
… of the green algae Chlamydomonas reinhardtii. An important acclimation mechanism to altering light conditions involves the post-transcriptional regulation of the nuclear-encoded photosystem II (PSII)-associated light-harvesting complex (LHCII) genes via cytosolic translational control …
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