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Photosynthesis Research

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https://www.readbyqxmd.com/read/27896527/an-enzyme-kinetics-study-of-the-ph-dependence-of-chloride-activation-of-oxygen-evolution-in-photosystem-ii
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
Kipras Redeckas, Vladislava Voiciuk, Mikas Vengris
No abstract text is available yet for this article.
October 26, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27757688/drought-stress-memory-in-the-photosynthetic-mechanisms-of-an-invasive-cam-species-aptenia-cordifolia
#10
Marta Pintó-Marijuan, Alba Cotado, Eva Fleta-Soriano, Sergi Munné-Bosch
Plants are known for their high capacity to acclimatise to fluctuating environmental conditions. A wide range of environmental conditions can lead to suboptimal physiological efficiency. However, recent studies have shown that plants can withstand repeated periods of stress. To find out how they do it, we studied photosynthetic adjustments to repeated water stress in Aptenia cordifolia: a facultative, invasive CAM species. Plants were subjected to three cycles of water deficit, and photosynthetic parameters and chloroplast antioxidants were quantified to gain an understanding of the mechanisms by which they cope with repeated stress periods...
October 18, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27743323/synechocystis-sp-pcc-6803-crua-sll0147-encodes-lycopene-cyclase-and-requires-bound-chlorophyll-a-for-activity
#11
Wei Xiong, Gaozhong Shen, Donald A Bryant
The genome of the model cyanobacterium, Synechococcus sp. PCC 7002, encodes two paralogs of CruA-type lycopene cyclases, SynPCC7002_A2153 and SynPCC7002_A0043, which are denoted cruA and cruP, respectively. Unlike the wild-type strain, a cruA deletion mutant is light-sensitive, grows slowly, and accumulates lycopene, γ-carotene, and 1-OH-lycopene; however, this strain still produces β-carotene and other carotenoids derived from it. Expression of cruA from Synechocystis sp. PCC 6803 (cruA 6803) in Escherichia coli strains that synthesize either lycopene or γ-carotene did not lead to the synthesis of either γ-carotene or β-carotene, respectively...
October 14, 2016: 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
#12
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...
October 13, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27734239/modular-antenna-of-photosystem-i-in-secondary-plastids-of-red-algal-origin-a-nannochloropsis-oceanica-case-study
#13
David Bína, Zdenko Gardian, Miroslava Herbstová, Radek Litvín
Photosystem I (PSI) is a multi-subunit integral pigment-protein complex that performs light-driven electron transfer from plastocyanin to ferredoxin in the thylakoid membrane of oxygenic photoautotrophs. In order to achieve the optimal photosynthetic performance under ambient irradiance, the absorption cross section of PSI is extended by means of peripheral antenna complexes. In eukaryotes, this role is played mostly by the pigment-protein complexes of the LHC family. The structure of the PSI-antenna supercomplexes has been relatively well understood in organisms harboring the primary plastid: red algae, green algae and plants...
October 12, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27726059/international-conference-on-photosynthesis-research-for-sustainability-2016-in-honor-of-nathan-nelson-and-turhan-nejat-veziro%C3%A4-lu
#14
Anatoly A Tsygankov, Suleyman I Allakhverdiev, Tatsuya Tomo, Govindjee
During June 19-26, 2016, an international conference ( http://photosynthesis2016.cellreg.org/ ) on "Photosynthesis Research for Sustainability-2016" was held in honor of Nathan Nelson and Turhan Nejat Veziroğlu at the Institute of Basic Biological Problems, Russian Academy of Sciences, formerly Institute of Photosynthesis, Academy of Sciences of the USSR, Pushchino, Russia. Further, this conference celebrated the 50th anniversary of the Institute. We provide here a brief introduction and key contributions of the two honored scientists, and then information on the conference, on the speakers, and the program...
October 10, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27709414/sensing-photosynthetic-herbicides-in-an-electrochemical-flow-cell
#15
Tibor Szabó, Richárd Csekő, Kata Hajdu, Krisztina Nagy, Orsolya Sipos, Péter Galajda, Győző Garab, László Nagy
Specific inhibitory reactions of herbicides with photosynthetic reaction centers bound to working electrodes were monitored in a conventional electrochemical cell and a newly designed microfluidic electrochemical flow cell. In both cases, the bacterial reaction centers were bound to a transparent conductive metal oxide, indium-tin-oxide, electrode through carbon nanotubes. In the conventional cell, photocurrent densities of up to a few μA/cm(2) could be measured routinely. The photocurrent could be blocked by the photosynthetic inhibitor terbutryn (I 50 = 0...
October 5, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27696181/comparison-of-excitation-energy-transfer-in-cyanobacterial-photosystem-i-in-solution-and-immobilized-on-conducting-glass
#16
Sebastian Szewczyk, Wojciech Giera, Sandrine D'Haene, Rienk van Grondelle, Krzysztof Gibasiewicz
Excitation energy transfer in monomeric and trimeric forms of photosystem I (PSI) from the cyanobacterium Synechocystis sp. PCC 6803 in solution or immobilized on FTO conducting glass was compared using time-resolved fluorescence. Deposition of PSI on glass preserves bi-exponential excitation decay of ~4-7 and ~21-25 ps lifetimes characteristic of PSI in solution. The faster phase was assigned in part to photochemical quenching (charge separation) of excited bulk chlorophylls and in part to energy transfer from bulk to low-energy (red) chlorophylls...
October 1, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27678250/time-resolved-infrared-spectroscopy-in-the-study-of-photosynthetic-systems
#17
Alberto Mezzetti, Winfried Leibl
Time-resolved (TR) infrared (IR) spectroscopy in the nanosecond to second timescale has been extensively used, in the last 30 years, in the study of photosynthetic systems. Interesting results have also been obtained at lower time resolution (minutes or even hours). In this review, we first describe the used techniques-dispersive IR, laser diode IR, rapid-scan Fourier transform (FT)IR, step-scan FTIR-underlying the advantages and disadvantages of each of them. Then, the main TR-IR results obtained so far in the investigation of photosynthetic reactions (in reaction centers, in light-harvesting systems, but also in entire membranes or even in living organisms) are presented...
September 27, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27671312/honoring-jean-david-rochaix
#18
Govindjee, Kevin Redding
We honor Jean-David Rochaix, an outstanding scholar of chloroplast biogenesis and photosynthesis, who received the prestigious Lifetime Achievement Award of the International Society of Photosynthesis Research at its 17th International Photosynthesis Congress held in Maastricht, The Netherlands (August 5-12, 2016). With this award he joins other major discoverers in the field of photosynthesis: Pierre Joliot (of France, 2013); Ulrich W. Heber* (of Germany, 2010) and Kenneth Sauer (of USA, 2010); Jan M. Anderson* (of Australia, 2007); and Horst T...
September 26, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27639727/arctic-micromonas-uses-protein-pools-and-non-photochemical-quenching-to-cope-with-temperature-restrictions-on-photosystem-ii-protein-turnover
#19
Guangyan Ni, Gabrielle Zimbalatti, Cole D Murphy, Audrey B Barnett, Christopher M Arsenault, Gang Li, Amanda M Cockshutt, Douglas A Campbell
Micromonas strains of small prasinophyte green algae are found throughout the world's oceans, exploiting widely different niches. We grew arctic and temperate strains of Micromonas and compared their susceptibilities to photoinactivation of Photosystem II, their counteracting Photosystem II repair capacities, their Photosystem II content, and their induction and relaxation of non-photochemical quenching. In the arctic strain Micromonas NCMA 2099, the cellular content of active Photosystem II represents only about 50 % of total Photosystem II protein, as a slow rate constant for clearance of PsbA protein limits instantaneous repair...
September 17, 2016: Photosynthesis Research
https://www.readbyqxmd.com/read/27638320/far-red-light-photoacclimation-farlip-in-synechococcus-sp-pcc-7335-i-regulation-of-farlip-gene-expression
#20
Ming-Yang Ho, Fei Gan, Gaozhong Shen, Chi Zhao, Donald A Bryant
Far-red light photoacclimation (FaRLiP) is a mechanism that allows some cyanobacteria to utilize far-red light (FRL) for oxygenic photosynthesis. During FaRLiP, cyanobacteria remodel photosystem (PS) I, PS II, and phycobilisomes while synthesizing Chl d, Chl f, and far-red-absorbing phycobiliproteins, and these changes enable these organisms to use FRL for growth. In this study, a conjugation-based genetic system was developed for Synechococcus sp. PCC 7335. Three antibiotic cassettes were successfully used to generate knockout mutations in genes in Synechococcus sp...
September 16, 2016: Photosynthesis Research
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