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Photosynthesis

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https://www.readbyqxmd.com/read/29775968/in-silico-structure-prediction-and-inhibition-mechanism-studies-of-athda14-as-revealed-by-homology-modeling-docking-molecular-dynamics-simulation
#1
Ming-Lang Zhao, Wang Wang, Hu Nie, Sha-Sha Cao, Lin-Fang Du
Histone deacetylases (HDACs) play a significant role in the epigenetic mechanism by catalyzing deacetylation of lysine on histone in both animals and plants. HDACs involved in growth, development and response to stresses in plants. Arabidopsis thaliana histone deacetylase 14 (AtHDA14) is found to localize in the mitochondria and chloroplasts, and it involved in photosynthesis and melatonin biosynthesis. However, its mechanism of action was still unknowns so far. Therefore, in this study, we constructed AtHDA14 protein model using homology modeling method, validated using PROCHECK and presented using Ramachandran plots...
May 6, 2018: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/29775927/effects-of-microcystin-lr-on-the-tissue-growth-and-physiological-responses-of-the-aquatic-plant-iris-pseudacorus-l
#2
Naiyu Wang, Can Wang
The release of cyanobacterial toxins during algal bloom has adverse effects on aquatic plants and animals. This study aimed to understand the toxic effects and mechanism of microcystin-LR (MC-LR) on the seedling growth and physiological responses of Iris pseudacorus L. (calamus). After a one-month exposure experiment, the growth and development of the calamus leaves were significantly inhibited, and this inhibitory effect was verified to be concentration dependent. Furthermore, the cell membrane system was damaged, and the photosynthesis was also adversely affected by MC-LR...
April 27, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29775926/chlorophyll-a-%C3%AF-uorescence-and-transcriptome-reveal-the-toxicological-effects-of-bisphenol-a-on-an-invasive-cyanobacterium-cylindrospermopsis-raciborskii
#3
Rong Xiang, Junqiong Shi, Hongbo Zhang, Congcong Dong, Li Liu, JunKe Fu, Xinyu He, Yanjun Yan, Zhongxing Wu
Bisphenol A has attracted worldwide attention due to its harmful effects on humans, animals and plants. In this study, the toxicological effects of BPA on Cylindrospermopsis raciborskii were assessed based on chlorophyll a fluorescence and transcriptome analyses. The results showed that the growth of C. raciborskii was significantly inhibited when BPA exceeded 0.1 mg L-1 . A marked rise of phase J was observed at a concentration greater than 0.1 mg L-1 , while a K phase appeared at 20 mg L-1 . The chlorophyll a fluorescence parameters of RC/CS0 , F0 , φP0 , φE0 , and ψ0 , underwent a significant decline under all treatments of BPA, whereas a significant increase in both VJ and M0 occurred under all concentrations of BPA...
May 9, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29774565/local-and-systemic-regulation-of-psii-efficiency-in-triticale-infected-by-the-hemibiotrophic-pathogen-microdochium-nivale
#4
Mateusz Dyda, Iwona Wąsek, Mirosław Tyrka, Maria Wędzony, Magdalena Szechyńska-Hebda
Microdochium nivale is a fungal pathogen that causes yield losses of cereals during winter. Cold hardening under light conditions induces genotype-dependent resistance of a plant to infection. We aim to show how photosystem II (PSII) regulation contributes to plant resistance. Using mapping population of triticale doubled haploid lines, three M. nivale strains and different infection assays, we demonstrate that plants that maintain a higher maximum quantum efficiency of PSII show less leaf damage upon infection...
May 17, 2018: Physiologia Plantarum
https://www.readbyqxmd.com/read/29774437/lexa-binds-to-transcription-regulatory-site-of-cell-division-gene-ftsz-in-toxic-cyanobacterium-microcystis-aeruginosa
#5
Takashi Honda, Daichi Morimoto, Yoshihiko Sako, Takashi Yoshida
Previously, we showed that DNA replication and cell division in toxic cyanobacterium Microcystis aeruginosa are coordinated by transcriptional regulation of cell division gene ftsZ and that an unknown protein specifically bound upstream of ftsZ (BpFz; DNA-binding protein to an upstream site of ftsZ) during successful DNA replication and cell division. Here, we purified BpFz from M. aeruginosa strain NIES-298 using DNA-affinity chromatography and gel-slicing combined with gel electrophoresis mobility shift assay (EMSA)...
May 17, 2018: Marine Biotechnology
https://www.readbyqxmd.com/read/29774016/taxon-function-decoupling-as-an-adaptive-signature-of-lake-microbial-metacommunities-under-a-chronic-polymetallic-pollution-gradient
#6
Bachar Cheaib, Malo Le Boulch, Pierre-Luc Mercier, Nicolas Derome
Adaptation of microbial communities to anthropogenic stressors can lead to reductions in microbial diversity and disequilibrium of ecosystem services. Such adaptation can change the molecular signatures of communities with differences in taxonomic and functional composition. Understanding the relationship between taxonomic and functional variation remains a critical issue in microbial ecology. Here, we assessed the taxonomic and functional diversity of a lake metacommunity system along a polymetallic pollution gradient caused by 60 years of chronic exposure to acid mine drainage (AMD)...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29773581/dynamic-changes-between-two-lhcx-related-energy-quenching-sites-control-diatom-photoacclimation
#7
Lucilla Taddei, Volha Chukhutsina, Bernard Lepetit, Giulio R Stella, Roberto Bassi, Herbert van Amerongen, Jean-Pierre Bouly, Marianne Jaubert, Giovanni Finazzi, Angela Falciatore
Marine diatoms are prominent phytoplankton organisms, optimally performing photosynthesis in extremely variable environments. Diatoms possess a strong ability to dissipate excess absorbed energy as heat via non-photochemical quenching (NPQ). This process relies on changes in carotenoid pigment composition (xanthophyll cycle) and on specific members of the light-harvesting complex (LHC) family specialized in photoprotection (LHCX), which potentially act as NPQ effectors. However, the link between light stress, NPQ, and the existence of different LHCX isoforms is not understood in these organisms...
May 17, 2018: Plant Physiology
https://www.readbyqxmd.com/read/29772492/high-copper-content-in-vineyard-soils-promotes-modifications-in-photosynthetic-parameters-and-morphological-changes-in-the-root-system-of-red-niagara-plantlets
#8
Vítor Gabriel Ambrosini, Daniel José Rosa, George Wellington Bastos de Melo, Jovani Zalamena, Cesar Cella, Daniela Guimarães Simão, Leandro Souza da Silva, Henrique Pessoa Dos Santos, Moreno Toselli, Tadeu Luis Tiecher, Gustavo Brunetto
High copper (Cu) soil contents, due to the continuous vineyard application of Cu fungicides throughout the years, may impair the growth of the shoot and modify the structure of the root system. The current study aimed to investigate the threshold levels of available Cu in the soil causing toxicity effects in young grapevine plants of 'Red Niagara' cultivated in clay soils. Grapevine plantlets were cultivated in pots containing vineyard devoted soils with increasing contents of available Cu (25, 80, 100 and 165 mg kg-1 ), for 53 days...
May 8, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29771393/differential-responses-of-picea-asperata-and-betula-albosinensis-to-nitrogen-supply-imposed-by-water-availability
#9
Chunying Yin, Sari Palmroth, Xueyong Pang, Bo Tang, Qing Liu, Ram Oren
A pot experiment was conducted to investigate the effects of nitrogen (N) addition (0, 20, 40 g N m-2 year-1, N0, N20, N40, respectively) on the growth, and biomass accumulation and allocation of coniferous and deciduous (Picea asperata Mast. and Betula albosinensis Burk.) seedlings under a range of soil moisture limitation (40%, 50%, 60%, 80% and 100% of field capacity, FC). At 100% FC, growth of shade-tolerant P. asperata increased with N supply, while that of shade-intolerant B. albosinensis reached a maximum at N20, declining somewhat thereafter...
May 16, 2018: Tree Physiology
https://www.readbyqxmd.com/read/29769592/unsaturation-of-vapour-pressure-inside-leaves-of-two-conifer-species
#10
Lucas A Cernusak, Nerea Ubierna, Michael W Jenkins, Steven R Garrity, Thom Rahn, Heath H Powers, David T Hanson, Sanna Sevanto, Suan Chin Wong, Nate G McDowell, Graham D Farquhar
Stomatal conductance (gs ) impacts both photosynthesis and transpiration, and is therefore fundamental to the global carbon and water cycles, food production, and ecosystem services. Mathematical models provide the primary means of analysing this important leaf gas exchange parameter. A nearly universal assumption in such models is that the vapour pressure inside leaves (ei ) remains saturated under all conditions. The validity of this assumption has not been well tested, because so far ei cannot be measured directly...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29769312/the-chloroplast-division-protein-arc6-acts-to-inhibit-disassembly-of-gdp-bound-ftsz2
#11
Min Woo Sung, Rahamthulla Shaik, Allan D TerBush, Katherine W Osteryoung, Stanislav Vitha, Andreas Holzenburg
Chloroplasts host photosynthesis and fulfill other metabolic functions that are essential to plant life. They have to divide by binary fission to maintain their numbers throughout cycles of cell division. Chloroplast division is achieved by a complex ring-shaped division machinery located on both the inner (stromal) and the outer (cytosolic) side of the chloroplast envelope. The inner division ring (termed the Z ring) is formed by the assembly of tubulin-like FtsZ1 and FtsZ2 proteins. ARC6 is a key chloroplast division protein that interacts with the Z ring...
May 16, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29769290/assessment-of-an-organ-specific-de-novo-transcriptome-of-the-nematode-trap-crop-solanum-sisymbriifolium
#12
Alexander Q Wixom, N Carol Casavant, Joseph C Kuhl, Fangming Xiao, Louise-Marie Dandurand, Allan B Caplan
Solanum sisymbriifolium , also known as "Litchi Tomato" or "Sticky Nightshade," is an undomesticated and poorly researched plant related to potato and tomato. Unlike the latter species, S. sisymbriifolium induces eggs of the cyst nematode, Globodera pallida , to hatch and migrate into its roots, but then arrests further nematode maturation. In order to provide researchers with a partial blueprint of its genetic make-up so that the mechanism of this response might be identified, we used single molecule real time (SMRT) sequencing to compile a high quality de novo transcriptome of 41,189 unigenes drawn from individually sequenced bud, root, stem, and leaf RNA populations...
May 16, 2018: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/29768919/molecular-mechanism-of-modified-clay-controlling-the-brown-tide-organism-aureococcus-anophagefferens-revealed-by-transcriptome-analysis
#13
Jianan Zhu, Zhiming Yu, Liyan He, Xihua Cao, Shuya Liu, Xiuxian Song
The data and experiences in mitigating harmful algal blooms (HABs) by modified clay (MC) show that a bloom does not continue after the dispersal of the MC, even though the density of the residual cells in the water is still high, at 20-30% of the initial cell density. This interesting phenomenon indicates that in addition to flocculation, MC has an additional control mechanism. Here, transcriptome sequencing technology was used to study the molecular mechanism of MC in controlling HABs. In residual cells treated with MC, the photosynthetic light reaction was the most affected physiological process...
May 16, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29768724/on-the-simultaneous-identification-and-quantification-of-microalgae-populations-based-on-fluorometric-techniques
#14
Natalia S Gsponer, M Claudia Rodríguez, Rodrigo E Palacios, Carlos A Chesta
In this study, the phytoplankton structure of a freshwater reservoir located in central Argentina (Embalse Río Tercero) was analyzed using Beutler's method (Photosynthesis Research 72: 39-53, 2002), aiming to provide water quality control agencies with a reliable tool for early detection of algae blooms, particularly cyanobacteria. The method estimates the concentration of chlorophyll a (Chl a) contributed by individual algal groups in a real sample by fitting its fluorescence excitation spectrum to a linear combination of norm spectra of relevant algae groups...
May 16, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29767842/more-than-just-co-2-recycling-corticular-photosynthesis-as-a-mechanism-to-reduce-the-risk-of-an-energy-crisis-induced-by-low-oxygen
#15
Christiane Wittmann, Hardy Pfanz
Reassimilation of internal CO2 via corticular photosynthesis (PScort ) has an important effect on the carbon economy of trees. However, little is known about its role as a source of O2 supply to the stem parenchyma and its implications in consumption and movement of O2 within trees. PScort of young Populus nigra (black poplar) trees was investigated by combining optical micro-optode measurements with monitoring of stem chlorophyll fluorescence. During times of zero sap flow in spring, stem oxygen concentrations (cO2 ) exhibited large temporal changes...
May 16, 2018: New Phytologist
https://www.readbyqxmd.com/read/29767344/in-memory-of-achim-trebst-1929-2017-a-pioneer-of-photosynthesis-research
#16
Hermann Bothe, Thomas Happe, Simon Trebst, Matthias Rögner
The life and work of Achim Trebst (1929-2017) was dedicated to photosynthesis, involving a wide span of seminal contributions which cumulated in more than five decades of active research: Major topics include the separation of light and dark phases in photosynthesis, the elucidation of photosynthesis by the use of inhibitors, the identification of the three-dimensional structure of photosystem II and its degradation, and an explanation of singlet oxygen formation. For this tribute, which has been initiated by Govindjee, twenty-two personal tributes by former coworkers, scientific friends, and his family have been compiled and combined with an introduction tracing the different stages of Achim Trebst's scientific life...
May 16, 2018: Photosynthesis Research
https://www.readbyqxmd.com/read/29766387/comparative-morphological-analysis-of-two-parallel-mycoheterotrophic-transitions-reveals-divergent-and-convergent-traits-in-the-genus-pyrola-pyroleae-ericaceae
#17
Kohtaroh Shutoh, Kenji Suetsugu, Shingo Kaneko, Takahide Kurosawa
The genus Pyrola includes species with different degree of mycoheterotrophy; some species possess individuals that rely on all carbon through their associations with fungi (full mycoheterotrophy, FM), whereas some species obtain carbon through both fungi and photosynthesis by itself (partial mycoheterotrophy, PM). To investigate how plant functional traits of photosynthesis and reproduction are related to the degree of mycoheterotrophy in the initial stage of the transition from PM to FM, we determined morphological traits in FM (or nearly FM) and PM species in two independent lineages, P...
May 15, 2018: Journal of Plant Research
https://www.readbyqxmd.com/read/29765387/photosynthetic-characteristics-and-chloroplast-ultrastructure-of-summer-maize-response-to-different-nitrogen-supplies
#18
Zheng Liu, Jia Gao, Fei Gao, Peng Liu, Bin Zhao, Jiwang Zhang
Maize ( Zea mays L.) is the important crop over the world. Nitrogen (N) as necessary element affects photosynthetic characteristics and grain yield of summer maize. In this study, N0 (0 kg N ha-1 ), N1 (129 kg N ha-1 ), N2 (185 kg N ha-1 ), and N3 (300 kg N ha-1 ) was conducted using hybrid 'ZhengDan958' at Dawenkou research field (36°11'N, 117°06'E, 178 m altitude) in the North China Plain to explore the effects of N rate on photosynthetic characteristics and chloroplast ultrastructure. Gas exchange parameters, chlorophyll fluorescence parameters, leaf area index (LAI), chlorophyll SPAD value, chloroplast ultrastructure, dry matter weight and grain yield were measured...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29763836/salicylic-acid-and-nitric-oxide-alleviate-high-temperature-induced-oxidative-damage-in-lablab-purpureus-l-plants-by-regulating-bio-physical-processes-and-dna-methylation
#19
Krishna Kumar Rai, Nagendra Rai, Shashi Pandey Rai
Salicylic acid (SA) and sodium nitroprusside (SNP, NO donor) modulates plant growth and development processes and recent findings have also revealed their involvement in the regulation of epigenetic factors under stress condition. In the present study, some of these factors were comparatively studied in hyacinth bean plants subjected to high temperature (HT) environment (40-42 °C) with and without exogenous application of SA and SNP under field condition. Exogenous application of SA and SNP substantially modulated the growth and biophysical process of hyacinth bean plants under HT environment...
April 26, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29763314/shedding-incoherent-light-on-quantum-effects-in-light-induced-biological-processes
#20
Paul Brumer
Light-induced processes that occur in nature, such as photosynthesis and photoisomerization in the first steps in vision, are often studied in the laboratory using coherent pulsed laser sources, which induce time-dependent coherent wavepacket molecule dynamics. Nature, however, uses stationary incoherent thermal radiation, such as sunlight, leading to a totally different molecular response, the time-independent steady state. It is vital to appreciate this difference in order to assess the role of quantum coherence effects in biological systems...
May 15, 2018: Journal of Physical Chemistry Letters
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