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Photosynthesis Research

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https://www.readbyqxmd.com/read/28093652/structural-basis-for-the-isotype-specific-interactions-of-ferredoxin-and-ferredoxin-nadp-oxidoreductase-an-evolutionary-switch-between-photosynthetic-and-heterotrophic-assimilation
#1
Fumio Shinohara, Genji Kurisu, Guy Hanke, Caroline Bowsher, Toshiharu Hase, Yoko Kimata-Ariga
In higher plants, ferredoxin (Fd) and ferredoxin-NADP(+) reductase (FNR) are each present as distinct isoproteins of photosynthetic type (leaf type) and non-photosynthetic type (root type). Root-type Fd and FNR are considered to facilitate the electron transfer from NADPH to Fd in the direction opposite to that occurring in the photosynthetic processes. We previously reported the crystal structure of the electron transfer complex between maize leaf FNR and Fd (leaf FNR:Fd complex), providing insights into the molecular interactions of the two proteins...
January 16, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28078551/the-proteolysis-adaptor-nbla-binds-to-the-n-terminus-of-%C3%AE-phycocyanin-implications-for-the-mechanism-of-phycobilisome-degradation
#2
Amelia Y Nguyen, William P Bricker, Hao Zhang, Daniel A Weisz, Michael L Gross, Himadri B Pakrasi
Phycobilisome (PBS) complexes are massive light-harvesting apparati in cyanobacteria that capture and funnel light energy to the photosystem. PBS complexes are dynamically degraded during nutrient deprivation, which causes severe chlorosis, and resynthesized during nutrient repletion. PBS degradation occurs rapidly after nutrient step down, and is specifically triggered by non-bleaching protein A (NblA), a small proteolysis adaptor that facilitates interactions between a Clp chaperone and phycobiliproteins...
January 11, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28062941/the-effects-of-ph-and-pco2-on-photosynthesis-and-respiration-in-the-diatom-thalassiosira-weissflogii
#3
Johanna A L Goldman, Michael L Bender, François M M Morel
The response of marine phytoplankton to the ongoing increase in atmospheric pCO2 reflects the consequences of both increased CO2 concentration and decreased pH in surface seawater. In the model diatom Thalassiosira weissflogii, we explored the effects of varying pCO2 and pH, independently and in concert, on photosynthesis and respiration by incubating samples in water enriched in H2(18)O. In long-term experiments (~6-h) at saturating light intensity, we observed no effects of pH or pCO2 on growth rate, photosynthesis or respiration...
January 6, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28039566/the-structure-of-fcpb-a-light-harvesting-complex-in-the-diatom-cyclotella-meneghiniana
#4
Anja Röding, Egbert Boekema, Claudia Büchel
Diatoms possess fucoxanthin chlorophyll proteins (FCP) as light-harvesting systems. These membrane intrinsic proteins bind fucoxanthin as major carotenoid and Chl c as accessory chlorophyll. The relatively high sequence homology to higher plant light-harvesting complex II gave rise to the assumption of a similar overall structure. From centric diatoms like Cyclotella meneghiniana, however, two major FCP complexes can be isolated. FCPa, composed of Fcp2 and Fcp6 subunits, was demonstrated to be trimeric, whereas FCPb, known to contain Fcp5 polypeptides, is of higher oligomeric state...
December 30, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/28032235/the-photosynthetic-cytochrome-c-550-from-the-diatom-phaeodactylum-tricornutum
#5
Pilar Bernal-Bayard, Leonor Puerto-Galán, Inmaculada Yruela, Inés García-Rubio, Carmen Castell, José M Ortega, Pablo J Alonso, Mercedes Roncel, Jesús I Martínez, Manuel Hervás, José A Navarro
The photosynthetic cytochrome c 550 from the marine diatom Phaeodactylum tricornutum has been purified and characterized. Cytochrome c 550 is mostly obtained from the soluble cell extract in relatively large amounts. In addition, the protein appeared to be truncated in the last hydrophobic residues of the C-terminus, both in the soluble cytochrome c 550 and in the protein extracted from the membrane fraction, as deduced by mass spectrometry analysis and the comparison with the gene sequence. Interestingly, it has been described that the C-terminus of cytochrome c 550 forms a hydrophobic finger involved in the interaction with photosystem II in cyanobacteria...
December 28, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/28025729/impact-of-elevated-temperatures-on-specific-leaf-weight-stomatal-density-photosynthesis-and-chlorophyll-fluorescence-in-soybean
#6
Kanchan Jumrani, Virender Singh Bhatia, Govind Prakash Pandey
High-temperature stress is a major environmental stress and there are limited studies elucidating its impact on soybean (Glycine max L. Merril.). The objectives of present study were to quantify the effect of high temperature on changes in leaf thickness, number of stomata on adaxial and abaxial leaf surfaces, gas exchange, chlorophyll fluorescence parameters and seed yield in soybean. Twelve soybean genotypes were grown at day/night temperatures of 30/22, 34/24, 38/26 and 42/28 °C with an average temperature of 26, 29, 32 and 35 °C, respectively, under greenhouse conditions...
December 26, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27896527/an-enzyme-kinetics-study-of-the-ph-dependence-of-chloride-activation-of-oxygen-evolution-in-photosystem-ii
#7
Sergei Baranov, Alice Haddy
Oxygen evolution by photosystem II (PSII) involves activation by Cl(-) ion, which is regulated by extrinsic subunits PsbQ and PsbP. In this study, the kinetics of chloride activation of oxygen evolution was studied in preparations of PSII depleted of the PsbQ and PsbP subunits (NaCl-washed and Na2SO4/pH 7.5-treated) over a pH range from 5.3 to 8.0. At low pH, activation by chloride was followed by inhibition at chloride concentrations >100 mM, whereas at high pH activation continued as the chloride concentration increased above 100 mM...
November 28, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27878416/identification-of-large-variation-in-the-photosynthetic-induction-response-among-37-soybean-glycine-max-l-merr-genotypes-that-is-not-correlated-with-steady-state-photosynthetic-capacity
#8
M A Soleh, Y Tanaka, S Y Kim, S C Huber, K Sakoda, T Shiraiwa
Irradiance continuously fluctuates during the day in the field. The speed of the induction response of photosynthesis in high light affects the cumulative carbon gain of the plant and could impact growth and yield. The photosynthetic induction response and its relationship with the photosynthetic capacity under steady-state conditions (P max) were evaluated in 37 diverse soybean [Glycine max (L.) Merr.] genotypes. The induction response of leaf photosynthesis showed large variation among the soybean genotypes...
November 22, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27864658/conjugates-between-photosystem-i-and-a-carbon-nanotube-for-a-photoresponse-device
#9
Daisuke Nii, Mariko Miyachi, Yuichiro Shimada, Yosuke Nozawa, Masahiro Ito, Yoshikazu Homma, Shu Ikehira, Yoshinori Yamanoi, Hiroshi Nishihara, Tatsuya Tomo
Photosystem I (PS I) is a large pigment-protein complex embedded in the thylakoid membranes that performs light-driven electron transfer across the thylakoid membrane. Carbon nanotubes exhibit excellent electrical conductivities and excellent strength and stiffness. In this study, we generated PSI-carbon nanotube conjugates dispersed in a solution aimed at application in artificial photosynthesis. PS I complexes in which a carbon nanotube binding peptide was introduced into the middle of the PsaE subunit were conjugated on a single-walled carbon nanotube, orienting the electron acceptor side to the nanotube...
November 18, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27854005/new-insights-into-the-photochemistry-of-carotenoid-spheroidenone-in-light-harvesting-complex-2-from-the-purple-bacterium-rhodobacter-sphaeroides
#10
Dariusz M Niedzwiedzki, Preston L Dilbeck, Qun Tang, Elizabeth C Martin, David F Bocian, C Neil Hunter, Dewey Holten
Light-harvesting complex 2 (LH2) from the semi-aerobically grown purple phototrophic bacterium Rhodobacter sphaeroides was studied using optical (static and time-resolved) and resonance Raman spectroscopies. This antenna complex comprises bacteriochlorophyll (BChl) a and the carotenoid spheroidenone, a ketolated derivative of spheroidene. The results indicate that the spheroidenone-LH2 complex contains two spectral forms of the carotenoid: (1) a minor, "blue" form with an S2 (1(1)B u(+) ) spectral origin band at 522 nm, shifted from the position in organic media simply by the high polarizability of the binding site, and (2) the major, "red" form with the origin band at 562 nm that is associated with a pool of pigments that more strongly interact with protein residues, most likely via hydrogen bonding...
November 16, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27844186/electron-flow-from-water-to-nadp-with-students-acting-as-molecules-in-the-chain-a-z-scheme-drama-in-a-classroom
#11
Sagarika Jaiswal, Misha Bansal, Shirshanya Roy, Adyasha Bharati, Barnali Padhi
No abstract text is available yet for this article.
November 14, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27817054/effects-of-co-overexpression-of-the-genes-of-rubisco-and-transketolase-on-photosynthesis-in-rice
#12
Yuji Suzuki, Eri Kondo, Amane Makino
Metabolome analyses have indicated an accumulation of sedoheptulose 7-phosphate in transgenic rice plants with overproduction of Rubisco (Suzuki et al. in Plant Cell Environ 35:1369-1379, 2012. doi: 10.1111/j.1365-3040.2012.02494.x ). Since Rubisco overproduction did not quantitatively enhance photosynthesis even under CO2-limited conditions, it is suspected that such an accumulation of sedoheptulose 7-phosphate hampers the improvement of photosynthetic capacity. In the present study, the gene of transketolase, which is involved in the metabolism of sedoheptulose 7-phosphate, was co-overexpressed with the Rubisco small subunit gene in rice...
November 5, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27815801/frequently-asked-questions-about-chlorophyll-fluorescence-the-sequel
#13
REVIEW
Hazem M Kalaji, Gert Schansker, Marian Brestic, Filippo Bussotti, Angeles Calatayud, Lorenzo Ferroni, Vasilij Goltsev, Lucia Guidi, Anjana Jajoo, Pengmin Li, Pasquale Losciale, Vinod K Mishra, Amarendra N Misra, Sergio G Nebauer, Simonetta Pancaldi, Consuelo Penella, Martina Pollastrini, Kancherla Suresh, Eduardo Tambussi, Marcos Yanniccari, Marek Zivcak, Magdalena D Cetner, Izabela A Samborska, Alexandrina Stirbet, Katarina Olsovska, Kristyna Kunderlikova, Henry Shelonzek, Szymon Rusinowski, Wojciech Bąba
Using chlorophyll (Chl) a fluorescence many aspects of the photosynthetic apparatus can be studied, both in vitro and, noninvasively, in vivo. Complementary techniques can help to interpret changes in the Chl a fluorescence kinetics. Kalaji et al. (Photosynth Res 122:121-158, 2014a) addressed several questions about instruments, methods and applications based on Chl a fluorescence. Here, additional Chl a fluorescence-related topics are discussed again in a question and answer format. Examples are the effect of connectivity on photochemical quenching, the correction of F V /F M values for PSI fluorescence, the energy partitioning concept, the interpretation of the complementary area, probing the donor side of PSII, the assignment of bands of 77 K fluorescence emission spectra to fluorescence emitters, the relationship between prompt and delayed fluorescence, potential problems when sampling tree canopies, the use of fluorescence parameters in QTL studies, the use of Chl a fluorescence in biosensor applications and the application of neural network approaches for the analysis of fluorescence measurements...
November 4, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27815800/frederick-loring-crane-1925-2016-discoverer-of-coenzyme-q10-and-rediscoverer-of-plastoquinone
#14
LETTER
Richard A Dilley
No abstract text is available yet for this article.
November 4, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27785684/erratum-to-investigation-of-the-s1-ict-equilibrium-in-fucoxanthin-by-ultrafast-pump-dump-probe-and-femtosecond-stimulated-raman-scattering-spectroscopy
#15
Kipras Redeckas, Vladislava Voiciuk, Mikas Vengris
No abstract text is available yet for this article.
January 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/27738959/in-vitro-kinetics-of-p700-reduction-of-thermosynechococcus-elongatus-trimeric-photosystem-i-complexes-by-recombinant-cytochrome-c-6-using-a-joliot-type-led-spectrophotometer
#16
Khoa Nguyen, Michael Vaughn, Paul Frymier, Barry D Bruce
The reduction rate of photo-oxidized Photosystem I (PSI) with various natural and artificial electron donors have been well studied by transient absorption spectroscopy. The electron transfer rate from various donors to P700(+) has been measured for a wide range of photosynthetic organisms encompassing cyanobacteria, algae, and plants. PSI can be a limiting component due to tedious extraction and purification methods required for this membrane protein. In this report, we have determined the in vivo, intracellular cytochrome c 6 (cyt c 6)/PSI ratio in Thermosynechococcus elongatus (T...
January 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/27612863/ultrafast-spectroscopy-tracks-carotenoid-configurations-in-the-orange-and-red-carotenoid-proteins-from-cyanobacteria
#17
Václav Šlouf, Valentyna Kuznetsova, Marcel Fuciman, Céline Bourcier de Carbon, Adjélé Wilson, Diana Kirilovsky, Tomáš Polívka
A quenching mechanism mediated by the orange carotenoid protein (OCP) is one of the ways cyanobacteria protect themselves against photooxidative stress. Here, we present a femtosecond spectroscopic study comparing OCP and RCP (red carotenoid protein) samples binding different carotenoids. We confirmed significant changes in carotenoid configuration upon OCP activation reported by Leverenz et al. (Science 348:1463-1466. doi: 10.1126/science.aaa7234 , 2015) by comparing the transient spectra of OCP and RCP. The most important marker of these changes was the magnitude of the transient signal associated with the carotenoid intramolecular charge-transfer (ICT) state...
January 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/27566625/interactive-effects-of-nitrogen-and-light-on-growth-rates-and-rubisco-content-of-small-and-large-centric-diatoms
#18
Gang Li, Douglas A Campbell
Among marine phytoplankton groups, diatoms span the widest range of cell size, with resulting effects upon their nitrogen uptake, photosynthesis and growth responses to light. We grew two strains of marine centric diatoms differing by ~4 orders of magnitude in cell biovolume in high (enriched artificial seawater with ~500 µmol L(-1) µmol L(-1) NO3(-)) and lower-nitrogen (enriched artificial seawater with <10 µmol L(-1) NO3(-)) media, across a range of growth light levels. Nitrogen and total protein per cell decreased with increasing growth light in both species when grown under the lower-nitrogen media...
January 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/27531584/influence-of-light-and-nitrogen-on-the-photosynthetic-efficiency-in-the-c4-plant-miscanthus%C3%A2-%C3%A3-%C3%A2-giganteus
#19
Jian-Ying Ma, Wei Sun, Nuria K Koteyeva, Elena Voznesenskaya, Samantha S Stutz, Anthony Gandin, Andreia M Smith-Moritz, Joshua L Heazlewood, Asaph B Cousins
There are numerous studies describing how growth conditions influence the efficiency of C4 photosynthesis. However, it remains unclear how changes in the biochemical capacity versus leaf anatomy drives this acclimation. Therefore, the aim of this study was to determine how growth light and nitrogen availability influence leaf anatomy, biochemistry and the efficiency of the CO2 concentrating mechanism in Miscanthus × giganteus. There was an increase in the mesophyll cell wall surface area but not cell well thickness in the high-light (HL) compared to the low-light (LL) grown plants suggesting a higher mesophyll conductance in the HL plants, which also had greater photosynthetic capacity...
January 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/27485797/a-two-component-nonphotochemical-fluorescence-quenching-in-eustigmatophyte-algae
#20
David Bína, Karel Bouda, Radek Litvín
Eustigmatophyte algae represent an interesting model system for the study of the regulation of the excitation energy flow due to their use of violaxanthin both as a major light-harvesting pigment and as the basis of xanthophyll cycle. Fluorescence induction kinetics was studied in an oleaginous marine alga Nannochloropsis oceanica. Nonphotochemical fluorescence quenching was analyzed in detail with respect to the state of the cellular xanthophyll pool. Two components of nonphotochemical fluorescence quenching (NPQ), both dependent on the presence of zeaxanthin, were clearly resolved, denoted as slow and fast NPQ based on kinetics of their formation...
January 2017: Photosynthesis Research
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