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https://www.readbyqxmd.com/read/28430813/phytoplankton-blooms-during-austral-summer-in-the-ross-sea-antarctica-driving-factors-and-trophic-implications
#1
Olga Mangoni, Vincenzo Saggiomo, Francesco Bolinesi, Francesca Margiotta, Giorgio Budillon, Yuri Cotroneo, Cristina Misic, Paola Rivaro, Maria Saggiomo
During the austral summer of 2014, an oceanographic cruise was conducted in the Ross Sea in the framework of the RoME (Ross Sea Mesoscale Experiment) Project. Forty-three hydrological stations were sampled within three different areas: the northern Ross Sea (RoME 1), Terra Nova Bay (RoME 2), and the southern Ross Sea (RoME 3). The ecological and photophysiological characteristics of the phytoplankton were investigated (i.e., size structure, functional groups, PSII maximum quantum efficiency, photoprotective pigments), as related to hydrographic and chemical features...
2017: PloS One
https://www.readbyqxmd.com/read/28425025/light-induced-formation-of-dimeric-lhcii
#2
Ewa Janik, Joanna Bednarska, Karol Sowinski, Rafal Luchowski, Monika Zubik, Wojciech Grudzinski, Wieslaw I Gruszecki
It emerges from numerous experiments that LHCII, the major photosynthetic antenna complex of plants, can appear not only in the trimeric or monomeric states but also as a dimer. We address the problem whether the dimeric form of the complex is just a simple intermediate element of the trimer-monomer transformation or if it can also be a physiologically relevant molecular organization form? Dimers of LHCII were analyzed with application of native electrophoresis, time-resolved fluorescence spectroscopy, and fluorescence correlation spectroscopy...
April 19, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28421106/the-synergistic-responses-of-different-photoprotective-pathways-in-dwarf-bamboo-fargesia-rufa-to-drought-and-subsequent-rewatering
#3
Chenggang Liu, Yanjie Wang, Kaiwen Pan, Qingwei Wang, Jin Liang, Yanqiang Jin, Akash Tariq
Dwarf bamboo-dominated forests are often subjected to temporary periods of drought due to rising air temperature and decreasing rainfall. Nevertheless, the relationship among CO2 assimilation, photoprotective pathways and metabolism of reactive oxygen species (ROS) remains unexplored in bamboo species. Changes in leaf gas exchange, chlorophyll fluorescence, energy partitioning, antioxidative system and compounds related to ROS metabolism in Fargesia rufa plants subjected to drought and subsequent rewatering were analyzed...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28419325/dissecting-molecular-and-physiological-response-mechanisms-to-high-solar-radiation-in-cyanic-and-acyanic-leaves-a-case-study-on-red-and-green-basil
#4
Massimiliano Tattini, Federico Sebastiani, Cecilia Brunetti, Alessio Fini, Sara Torre, Antonella Gori, Mauro Centritto, Francesco Ferrini, Marco Landi, Lucia Guidi
Photosynthetic performance and the expression of genes involved in light signaling and the biosynthesis of isoprenoids and phenylpropanoids were analysed in green ('Tigullio', TIG) and red ('Red Rubin', RR) basil. The aim was to detect the physiological and molecular response mechanisms to high sunlight. The attenuation of blue-green light by epidermal anthocyanins was shown to evoke shade-avoidance responses with consequential effects on leaf morpho-anatomical traits and gas exchange performance. Red basil had a lower mesophyll conductance, partially compensated by the less effective control of stomatal movements, in comparison with TIG...
April 17, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28417557/a-multitarget-approach-toward-the-development-of-a-new-series-of-8-substituted-purines-for-photoprotection-and-prevention-of-ultra-violet-uv-related-damages
#5
Ernestine Nicaise Djuidje, Valeria Dissette, Alessia Bino, Simonetta Benetti, Jan Balzarini, Sandra Liekens, Stefano Manfredini, Silvia Vertuani, Anna Baldisserotto
In environmental abundance, UV is the most important modifiable risk factor for skin cancer and many other skin diseases such as early photo-aging. Among solar radiation, ultraviolet (UV) is mainly responsible for inducing skin problems. In search of novel photoprotective purines, a new series of 8-substituted purines were synthesized from commercially available 6-hydroxy-4,5-diaminopyrimidine hemisulfate or 4,5-diaminopyrimidine. All the title compounds were investigated for their UV-filter, antioxidant, antifugal and antiproliferative activities...
April 18, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28416696/zeaxanthin-dependent-nonphotochemical-quenching-does-not-occur-in-photosystem-i-in-the-higher-plant-arabidopsis-thaliana
#6
Lijin Tian, Pengqi Xu, Volha U Chukhutsina, Alfred R Holzwarth, Roberta Croce
Nonphotochemical quenching (NPQ) is the process that protects the photosynthetic apparatus of plants and algae from photodamage by dissipating as heat the energy absorbed in excess. Studies on NPQ have almost exclusively focused on photosystem II (PSII), as it was believed that NPQ does not occur in photosystem I (PSI). Recently, Ballottari et al. [Ballottari M, et al. (2014) Proc Natl Acad Sci USA 111:E2431-E2438], analyzing PSI particles isolated from an Arabidopsis thaliana mutant that accumulates zeaxanthin constitutively, have reported that this xanthophyll can efficiently induce chlorophyll fluorescence quenching in PSI...
April 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28413232/the-freshwater-red-alga-batrachospermum-turfosum-florideophyceae-can-acclimate-to-a-wide-range-of-light-and-temperature-conditions
#7
Siegfried Aigner, Andreas Holzinger, Ulf Karsten, Ilse Kranner
Batrachospermum turfosum Bory is one of the generalists among the few red algae that have adapted to freshwater habitats, occurring in a variety of primarily shaded, nutrient-poor micro-habitats with lotic (running) or lentic (standing) waters. Seasonal variations in water level and canopy cover can expose this sessile alga to widely fluctuating temperatures, solar irradiation and nutrient availability. Here we report on the ecophysiology of B. turfosum collected from an ultra-oligotrophic bog pool in the Austrian Alps...
2017: Phycologia
https://www.readbyqxmd.com/read/28411584/illuminating-colors-regulation-of-carotenoid-biosynthesis-and-accumulation-by-light
#8
REVIEW
Briardo Llorente, Jaime F Martinez-Garcia, Claudia Stange, Manuel Rodriguez-Concepcion
Light stimulates the biosynthesis of carotenoids and regulates the development of plastid structures to accommodate these photoprotective pigments. Work with Arabidopsis revealed molecular factors coordinating carotenoid biosynthesis and storage with photosynthetic development during deetiolation, when underground seedlings emerge to the light. Some of these factors also adjust carotenoid biosynthesis in response to plant proximity (i.e., shade), a mechanism that was readapted in tomato to monitor fruit ripening progression...
April 12, 2017: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/28405863/high-light-acclimation-of-chromera-velia-points-to-photoprotective-npq
#9
Erica Belgio, Eliška Trsková, Eva Kotabová, Daniela Ewe, Ondřej Prášil, Radek Kaňa
It has previously been shown that the long-term treatment of Arabidopsis thaliana with the chloroplast inhibitor lincomycin leads to photosynthetic membranes enriched in antennas, strongly reduced in photosystem II reaction centers (PSII) and with enhanced nonphotochemical quenching (NPQ) (Belgio et al. Biophys J 102:2761-2771, 2012). Here, a similar physiological response was found in the microalga Chromera velia grown under high light (HL). In comparison to cells acclimated to low light, HL cells displayed a severe re-organization of the photosynthetic membrane characterized by (1) a reduction of PSII but similar antenna content; (2) partial uncoupling of antennas from PSII; (3) enhanced NPQ...
April 12, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28405862/isolation-and-characterization-of-psi-lhci-super-complex-and-their-sub-complexes-from-a-red-alga-cyanidioschyzon-merolae
#10
Lirong Tian, Zheyi Liu, Fangjun Wang, Liangliang Shen, Jinghua Chen, Lijing Chang, Songhao Zhao, Guangye Han, Wenda Wang, Tingyun Kuang, Xiaochun Qin, Jian-Ren Shen
Photosystem I (PSI)-light-harvesting complex I (LHCI) super-complex and its sub-complexes PSI core and LHCI, were purified from a unicellular red alga Cyanidioschyzon merolae and characterized. PSI-LHCI of C. merolae existed as a monomer with a molecular mass of 580 kDa. Mass spectrometry analysis identified 11 subunits (PsaA, B, C, D, E, F, I, J, K, L, O) in the core complex and three LHCI subunits, CMQ142C, CMN234C, and CMN235C in LHCI, indicating that at least three Lhcr subunits associate with the red algal PSI core...
April 12, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28403551/cyclic-electron-flow-npq-and-photorespiration-are-crucial-for-the-establishment-of-young-plants-of-ricinus-communis-and-jatropha-curcas-exposed-to-drought
#11
Milton Costa Lima Neto, João Victor A Cerqueira, Juliana Ribeiro da Cunha, Rafael Vasconcelos Ribeiro, Joaquim Albenísio G Silveira
Although plant physiological responses to drought have been widely studied, the interaction between photoprotection, photorespiration and antioxidant metabolism in water-stressed plants is scarcely known. This study aimed to evaluate the physiological adjustments preserving photosynthesis and growth in two plant-species with differential tolerance to drought: Jatropha curcas and Ricinus communis. We measured stress indicators, gas exchange, photochemistry of PSII and PSI, antioxidant enzymes, cyclic electron flow and photorespiradion...
April 12, 2017: Plant Biology
https://www.readbyqxmd.com/read/28403199/the-plastoquinone-pool-of-nannochloropsis-oceanica-is-not-completely-reduced-during-bright-light-pulses
#12
Gunvor Røkke, Thor Bernt Melø, Martin Frank Hohmann-Marriott
The lipid-producing model alga Nannochloropsis oceanica has a distinct photosynthetic machinery. This organism possesses chlorophyll a as its only chlorophyll species, and has a high ratio of PSI to PSII. This high ratio of PSI to PSII may affect the redox state of the plastoquinone pool during exposure to light, and consequently may play a role in activating photoprotection mechanisms. We utilized pulse-amplitude modulated fluorometry to investigate the redox state of the plastoquinone pool during and after bright light pulses...
2017: PloS One
https://www.readbyqxmd.com/read/28394312/two-mechanisms-for-dissipation-of-excess-light-in-monomeric-and-trimeric-light-harvesting-complexes
#13
Luca Dall'Osto, Stefano Cazzaniga, Mauro Bressan, David Paleček, Karel Židek, Krishna K Niyogi, Graham R Fleming, Donatas Zigmantas, Roberto Bassi
Oxygenic photoautotrophs require mechanisms for rapidly matching the level of chlorophyll excited states from light harvesting with the rate of electron transport from water to carbon dioxide. These photoprotective reactions prevent formation of reactive excited states and photoinhibition. The fastest response to excess illumination is the so-called non-photochemical quenching which, in higher plants, requires the luminal pH sensor PsbS and other yet unidentified components of the photosystem II antenna. Both trimeric light-harvesting complex II (LHCII) and monomeric LHC proteins have been indicated as site(s) of the heat-dissipative reactions...
April 10, 2017: Nature Plants
https://www.readbyqxmd.com/read/28391046/structure-and-functions-of-orange-carotenoid-protein-homologs-in-cyanobacteria
#14
REVIEW
Han Bao, Matthew R Melnicki, Cheryl A Kerfeld
Rapidly-induced photoprotection in cyanobacteria involves thermal dissipation of excess energy absorbed by the phycobilisome (PBS), the primary light-harvesting antenna. This process is called non-photochemical quenching (NPQ), and is mediated by a water-soluble photoactive protein, the Orange Carotenoid Protein (OCP). The OCP is structurally and functionally modular, consisting of a sensor domain, an effector domain, and a carotenoid. Blue-green light induces a structural transition of the OCP from the orange inactive form, OCP(o), to the red active form, OCP(R)...
April 5, 2017: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/28388878/medium-term-water-deficit-elicits-distinct-transcriptome-responses-in-eucalyptus-species-of-contrasting-environmental-origin
#15
Antanas V Spokevicius, Josquin Tibbits, Philippe Rigault, Marc-Alexandre Nolin, Caroline Müller, Andrew Merchant
BACKGROUND: Climatic and edaphic conditions over geological timescales have generated enormous diversity of adaptive traits and high speciation within the genus Eucalyptus (L. Hér.). Eucalypt species occur from high rainfall to semi-arid zones and from the tropics to latitudes as high as 43°S. Despite several morphological and metabolomic characterizations, little is known regarding gene expression differences that underpin differences in tolerance to environmental change. Using species of contrasting taxonomy, morphology and physiology (E...
April 7, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28386792/biophysical-modeling-of-in-vitro-and-in-vivo-processes-underlying-regulated-photoprotective-mechanism-in-cyanobacteria
#16
Evgeny A Shirshin, Elena E Nikonova, Fedor I Kuzminov, Nikolai N Sluchanko, Irina V Elanskaya, Maxim Y Gorbunov, Victor V Fadeev, Thomas Friedrich, Eugene G Maksimov
Non-photochemical quenching (NPQ) is a mechanism responsible for high light tolerance in photosynthetic organisms. In cyanobacteria, NPQ is realized by the interplay between light-harvesting complexes, phycobilisomes (PBs), a light sensor and effector of NPQ, the photoactive orange carotenoid protein (OCP), and the fluorescence recovery protein (FRP). Here, we introduced a biophysical model, which takes into account the whole spectrum of interactions between PBs, OCP, and FRP and describes the experimental PBs fluorescence kinetics, unraveling interaction rate constants between the components involved and their relative concentrations in the cell...
April 6, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28382767/safety-conscious-or-living-dangerously-what-is-the-right-level-of-plant-photoprotection-for-fitness-and-productivity
#17
Erik Murchie
No abstract text is available yet for this article.
April 6, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28371229/physiological-and-proteomic-characterization-of-light-adaptations-in-marine-synechococcus
#18
Katherine Rm Mackey, Anton F Post, Matthew R McIlvin, Mak A Saito
Marine Synechococcus thrive over a range of light regimes in the ocean. We examined the proteomic, genomic, and physiological responses of seven Synechococcus isolates to moderate irradiances (5-80μE m(-2) s(-1) ), and show that Synechococcus spans a continuum of light responses ranging from low light optimized (LLO) to high light optimized (HLO). These light responses are linked to phylogeny and pigmentation. Marine sub-cluster 5.1a isolates with higher phycouribilin: phycoerythrobilin ratios fell toward the LLO end of the continuum, while sub-cluster 5...
March 30, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28360892/enhancement-of-non-photochemical-quenching-as-an-adaptive-strategy-under-phosphorus-deprivation-in-the-dinoflagellate-karlodinium-veneficum
#19
Yudong Cui, Huan Zhang, Senjie Lin
Intensified water column stratification due to global warming has the potential to decrease nutrient availability while increasing excess light for the photosynthesis of phytoplankton in the euphotic zone, which together will increase the need for photoprotective strategies such as non-photochemical quenching (NPQ). We investigated whether NPQ is enhanced and how it is regulated molecularly under phosphorus (P) deprivation in the dinoflagellate Karlodinium veneficum. We grew K. veneficum under P-replete and P-depleted conditions, monitored their growth rates and chlorophyll fluorescence, and conducted gene expression and comparative proteomic analyses...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28358623/one-target-two-mechanisms-the-impact-of-candidatus-liberibacter-asiaticus-and-its-vector-diaphorina-citri-on-citrus-leaf-pigments
#20
Nabil Killiny, Yasser Nehela
Huanglongbing is currently the largest threat to global citrus production. We examined the effect of HLB pathogen, Candidatus Liberibacter asiaticus-infection and/or its vector, Diaphorina citri-infestation on Valencia sweet orange leaf pigments using HPLC, followed by gene expression analysis for 46 involved genes in carotenoids- and chlorophylls-biosynthesis pathways. Both CLas and D. citri alter the total citrus leaf pigments balance with a greater impact by CLas. While zeaxanthin was accumulated in CLas-infected leaves, chlorophyllide a was increased in D...
March 30, 2017: Molecular Plant-microbe Interactions: MPMI
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