Abstract:
:The effects of protein phosphorylation and cation depletion on the electron transport rate and fluorescence emission characteristics of photosystem I at two stages of chloroplast development in light-grown wheat leaves are examined. The light-harvesting chlorophyll a/b protein complex associated with photosystem I (LHC I) was absent from the thylakoids at the early stage of development, but that associated with photosystem II (LHC II) was present. Protein phosphorylation produced an increase in the light-limited rate of photosystem I electron transport at the early stage of development when chlorophyll b was preferentially excited, indicating that LHC I is not required for transfer of excitation energy from phosphorylated LHC II to the core complex of photosystem I. However, no enhancement of photosystem I fluorescence at 77 K was observed at this stage of development, demonstrating that a strict relationship between excitation energy density in photosystem I pigment matrices and the long-wavelength fluorescence emission from photosystem I at 77 K does not exist. Depletion of Mg(2+) from the thylakoids produced a stimulation of photosystem I electron transport at both stages of development, but a large enhancement of the photosystem I fluorescence emission was observed only in the thylakoids containing LHC I. It is suggested that the enhancement of PS I electron transport by Mg(2+)-depletion and phosphorylation of LHC II is associated with an enhancement of fluorescence at 77 K from LHC I and not from the core complex of PS I.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Bredenkamp GJ,Baker NRdoi
10.1007/BF00030071subject
Has Abstractpub_date
1990-01-01 00:00:00pages
111-7issue
1eissn
0166-8595issn
1573-5079journal_volume
23pub_type
杂志文章abstract::DCMU (3-(3,4-dichlorophenyl)-1,1-dimethylurea) at concentrations higher than 10 μM suppresses the second time range delayed fluorescence (DF) of pea chloroplasts, due to inhibition of the oxidizing side of photosystem II (PS II). The inhibition of the reducing side of PS II resulting in the suppression of millisecond ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00054986
更新日期:1988-01-01 00:00:00
abstract::The content and composition of pigments and acyl lipids (monogalactosyl diacylglycerol, digalactosyl diacylglycerol and phosphatidyl glycerol) have been investigated in developing chloroplasts isolated from successive 2-cm sections along the leaves of wheat seedlings grown either under 100, 30 or 3 W·m(-2). In all exa...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00035244
更新日期:1986-01-01 00:00:00
abstract::A study of the absorption and fluorescence characteristics of the D1/D2/cytb-559 reaction centre complex of Photosystem II has been carried out by gaussian decomposition of absorption spectra both at room temperature and 72 K and of the room temperature fluorescence spectrum. A five component fit was found in which th...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF02183048
更新日期:1994-09-01 00:00:00
abstract::The potential role of foliar carbon export features in the acclimation of photosynthetic capacity to differences and changes in light environment was evaluated. These features included apoplastic vs. symplastic phloem loading, density of loading veins, plasmodesmatal frequency in intermediary cells, and the ratio of l...
journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-006-9123-3
更新日期:2007-11-01 00:00:00
abstract::A simple approach to determine CO2/O2 specificity factor (τ) of ribulose 1,5-bisphosphate carboxylase/oxygenase is described. The assay measures the amount of CO2 fixation at varying [CO2]/[O2] ratios after complete consumption of ribulose 1,5-bisphosphate (RuBP). Carbon dioxide fixation catalyzed by the carboxylase w...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00029463
更新日期:1995-01-01 00:00:00
abstract::Solubilisation of thylakoid membranes from young leaves of Pisum sativum in the presence of Triton X-100 resulted in an almost complete loss of quenching of light-harvesting chlorophyll-protein (LHCP) fluorescence, as measured at 77°K. There were concomitant changes in the kinetics of light-saturation curves of electr...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00037130
更新日期:1986-01-01 00:00:00
abstract::Maximum photosynthetic CO2 exchange rates (Pn) of single attached leaves were determined for several cassava cultivars selected from different habitats and grown in pots outdoors at CIAT, Colombia, S.A. Pn rates were in a narrow range of 22 to 26 μmol CO2 m(-2)s(-1) for all cultivars tested when measured at high photo...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00030025
更新日期:1984-09-01 00:00:00
abstract::The LH2 antenna complexes of purple bacteria occur, depending on light conditions, in various different spectroscopic forms, with a similar structure but different absorption spectra. The differences are related to point changes in the primary amino acid sequence, but the molecular-level relationship between these cha...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-018-0492-1
更新日期:2018-08-01 00:00:00
abstract::In this report we demonstrate sulfite interaction with oxygen and PSII electron acceptors (ferricyanide and para-benzoquinone) during measurement of oxygen evolution in chloroplasts. Redox potentials of oxygen, ferricyanide and para-benzoquinone allow them to compete for sulfite. Without taking this into account, sulf...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00019595
更新日期:1987-01-01 00:00:00
abstract::Glycolate oxidase (GO; EC 1.1.3.1) was purified from the leaves of three plant species:Amaranthus hypochondriacus L.(NAD-ME type C4 dicot),Pisum sativum L. (C3 species) andParthenium hysterophorus L. (C3-C4. intermediate). A flavin moiety was present in the enzyme from all the three species. The enzyme from the C4 pla...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF02184284
更新日期:1996-03-01 00:00:00
abstract::In recent years the enzymes of the C3 photosynthetic carbon reduction (PCR) cycle have been studied using the techniques of molecular biology. In this review we discuss the primary protein sequences and structural predictions that have been made for a number of these enzymes, which, with the input of crystallographic ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00029971
更新日期:1991-01-01 00:00:00
abstract::NADP:ferredoxin oxidoreductase (EC. 1.6.7.1.) isolated from a thermophilic blue-green alga, Synechococcus sp., was stable at temperatures up to 65°C. The diaphorase and cytochrome c reductase activities of the enzyme were low at 25°C but increased with elevated temperature to reach a maximum at about 60°C. The pH-prof...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00020595
更新日期:1980-09-01 00:00:00
abstract::Lipids are important components of transmembrane protein complexes. In order to study the roles of lipids in photosystem II (PSII), we treated the PSII core dimer complex from a thermophilic cyanobacterium Thermosynechococcus vulcanus with phospholipase A(2) (PLA(2)) and lipase, and examined their effects on PSII stru...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-008-9335-9
更新日期:2008-10-01 00:00:00
abstract::The filamentous nitrogen-fixing cyanobacterium, Anabaena sp. strain PCC 7120 was found to tolerate very high doses of 60Co-gamma radiation or prolonged desiccation. Post-stress, cells remained intact and revived all the vital functions. A remarkable capacity to repair highly disintegrated genome and recycle the damage...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-013-9936-9
更新日期:2013-10-12 00:00:00
abstract::Electron transfer pathways in photosynthesis involve interactions between membrane-bound complexes such as reaction centres with an extrinsic partner. In this study, the biological specificity of electron transfer between the reaction centre-light-harvesting 1-PufX complex and its extrinsic electron donor, cytochrome ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-013-9812-7
更新日期:2014-05-01 00:00:00
abstract::The effects of Fe resupply to Fe-deficient plants have been investigated in hydroponically-grown sugar beet. In the short-term (24 h) after Fe resupply, major changes were observed, although de novo chlorophyll (Chl) synthesis had not begun yet. Approximately 50% of the zeaxanthin was converted into violaxanthin, wher...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/B:PRES.0000011919.35309.5e
更新日期:2004-01-01 00:00:00
abstract::Alternative electron sinks are an important regulatory mechanism to dissipate excessively absorbed light energy particularly under fast changing dynamic light conditions. In diatoms, the cyclic electron transport (CET) around Photosystem II (PS II) is an alternative electron transport pathway (AET) that contributes to...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-015-0209-7
更新日期:2016-05-01 00:00:00
abstract::A model is presented describing the relationship between chlorophyll fluorescence quenching and photoinhibition of Photosystem (PS) II-dependent electron transport in chloroplasts. The model is based on the hypothesis that excess light creates a population of inhibited PS II units in the thylakoids. Those units are su...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00042009
更新日期:1991-12-01 00:00:00
abstract::We investigated the dark-to-light transition in Synechococcus sp. PCC 7942 cells by a detailed analysis of fluorescence transients induced by strong red light. The transients, recorded with high data-acquisition, revealed all the steps of the fast (OJIP; 10(-5)-1 s) and slow phase (PSM(T); 1-10(3) s), kinetically dist...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-009-9405-7
更新日期:2009-03-01 00:00:00
abstract::Most chloroplasts undergo changes in composition, function and structure in response to growth irradiance. However, Tradescantia albiflora, a facultative shade plant, is unable to modulate its light-harvesting components and has the same Chl a/Chl b ratios and number of functional PS II and PS I reaction centres on a ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1010681721929
更新日期:2001-01-01 00:00:00
abstract::The binding characteristics and the inhibitory power of atrazine and DCMU towards uncoupled electron flow activity were studied in acyl lipid-depleted thylakoid membranes from atrazine-susceptible and-resistant biotypes of Solanum nigrum L. For this purpose, phospholipase A2 from Vipera russelli and the lipase from Rh...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00049537
更新日期:1992-01-01 00:00:00
abstract::The polypeptide composition of thylakoid membranes of the red alga Cyanidium caldarium was studied by PAGE in the presence of lithium dodecyl sulfate. The thylakoid membranes were shown to contain 65 polypeptides with mol wt from 110 to 10 kDa. PS I isolated from C. caldarium cells is composed of at least 5 components...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00035678
更新日期:1991-10-01 00:00:00
abstract::The functional peculiarities and responses of the photosynthetic system in the flowering homoiochlorophyllous desiccation-tolerant (HDT) Haberlea rhodopensis and the non-desiccation-tolerant spinach were compared during desiccation and rehydration. Increasing rate of water loss clearly modifies the kinetic parameters ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-005-2440-0
更新日期:2005-08-01 00:00:00
abstract::Tropical plants are sensitive to chilling temperatures above zero but it is still unclear whether photosystem I (PSI) or photosystem II (PSII) of tropical plants is mainly affected by chilling temperatures. In this study, the effect of 4 degrees C associated with various light densities on PSII and PSI was studied in ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-010-9539-7
更新日期:2010-03-01 00:00:00
abstract::Phosphoenolpyruvate carboxylase from leaves of the C4 plant Setaria verticillata (L.) Beauv. is activated by light; day levels of activity are reached after 30 minutes of illumination. Photoactivation is prevented by inhibitors of photosynthetic electron flow or of photophosphorylation and by D,L-glyceraldehyde, which...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00028842
更新日期:1988-06-01 00:00:00
abstract::Several models have been proposed to interpret the mechanism of proton-pumping associated with the electron transfer reactions in the cytochrome b/f complex. Energetics considerations suggest that the proton pump is coupled to the oxidation of cytochrome b by plastoquinone. Experiments performed in living cells under ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00029737
更新日期:1986-01-01 00:00:00
abstract::The availability of a complete genome database for the cyanobacterium Synechocystis sp. PCC6803 (glucose-tolerant strain) has raised expectations that this organism would become a reference strain for work aimed at understanding the CO(2)-concentrating mechanism (CCM) in cyanobacteria. However, the amount of physiolog...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1025850230977
更新日期:2003-01-01 00:00:00
abstract::In many ways, the 1963 conference at Airlie House was an unusual event. The meeting convincingly demonstrated that photosynthetic research, previously reported mostly at conferences of botany and/or plant physiology, had become an independent and important field of biological research. New techniques had been develope...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/B:PRES.0000030427.35645.5c
更新日期:2004-01-01 00:00:00
abstract::Recently, a number of techniques, some of them relatively new and many often used in combination, have given a clearer picture of the dynamic role of electron transport in Photosystem I of photosynthesis and of coupled cyclic photophosphorylation. For example, the photoacoustic technique has detected cyclic electron t...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00033035
更新日期:1993-06-01 00:00:00
abstract::Macroalgae occur in the marine benthos from the upper intertidal to depths of more than 200 m, contributing up to 1 Pg C per year to global primary productivity. Freshwater macroalgae are mainly green (Chlorophyta) with some red (Rhodophyta) and a small contribution of brown (Phaeophyceae) algae, while in the ocean al...
journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-012-9768-z
更新日期:2012-09-01 00:00:00