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Doose C, Hubas C. The metabolites of light: Untargeted metabolomic approaches bring new clues to understand light-driven acclimation of intertidal mudflat biofilm. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168692. [PMID: 38008320 DOI: 10.1016/j.scitotenv.2023.168692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 11/06/2023] [Accepted: 11/16/2023] [Indexed: 11/28/2023]
Abstract
The microphytobenthos (MPB), a microbial community of primary producers, play a key role in coastal ecosystem functioning, particularly in intertidal mudflats. These mudflats experience challenging variations of irradiance, forcing the micro-organisms to develop photoprotective mechanisms to survive and thrive in this dynamic environment. Two major adaptations to light are well described in literature: the excess of light energy dissipation through non-photochemical quenching (NPQ), and the vertical migration in the sediment. These mechanisms trigger considerable scientific interest, but the biological processes and metabolic mechanisms involved in light-driven vertical migration remain largely unknown. To our knowledge, this study investigates for the first time metabolomic responses of a migrational mudflat biofilm exposed for 30 min to a light gradient of photosynthetically active radiation (PAR) from 50 to 1000 μmol photons m-2 s-1. The untargeted metabolomic analysis allowed to identify metabolites involved in two types of responses to light irradiance levels. On the one hand, the production of SFAs and MUFAs, primarily derived from bacteria, indicates a healthy photosynthetic state of MPB under low light (LL; 50 and 100 PAR) and medium light (ML; 250 PAR) conditions. Conversely, when exposed to high light (HL; 500, 750 and 1000 PAR), the MPB experienced light-induced stress, triggering the production of alka(e)nes and fatty alcohols. The physiological and ecological roles of these compounds are poorly described in literature. This study sheds new light on the topic, as it suggests that these compounds may play a crucial and previously unexplored role in light-induced stress acclimation of migrational MPB biofilms. Since alka(e)nes are produced from FAs decarboxylation, these results thus emphasize for the first time the importance of FAs pathways in microphytobenthic biofilms acclimation to light.
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Affiliation(s)
- Caroline Doose
- Muséum National d'Histoire Naturelle, UMR BOREA, MNHN-CNRS-UCN-UPMC-IRD-UA, Station Marine de Concarneau, Concarneau, France.
| | - Cédric Hubas
- Muséum National d'Histoire Naturelle, UMR BOREA, MNHN-CNRS-UCN-UPMC-IRD-UA, Station Marine de Concarneau, Concarneau, France.
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2
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Trojak M, Skowron E. Growth Light Quality Influences Leaf Surface Temperature by Regulating the Rate of Non-Photochemical Quenching Thermal Dissipation and Stomatal Conductance. Int J Mol Sci 2023; 24:16911. [PMID: 38069235 PMCID: PMC10706689 DOI: 10.3390/ijms242316911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 11/12/2023] [Accepted: 11/15/2023] [Indexed: 12/18/2023] Open
Abstract
Significant efforts have been made to optimise spectrum quality in indoor farming to maximise artificial light utilisation and reduce water loss. For such an improvement, green (G) light supplementation to a red-blue (RB) background was successfully employed in our previous studies to restrict both non-photochemical quenching (NPQ) and stomatal conductance (gs). At the same time, however, the downregulation of NPQ and gs had the opposite influence on leaf temperature (Tleaf). Thus, to determine which factor plays the most prominent role in Tleaf regulation and whether such a response is temporal or permanent, we investigated the correlation between NPQ and gs and, subsequently, Tleaf. To this end, we analysed tomato plants (Solanum lycopersicum L. cv. Malinowy Ozarowski) grown solely under monochromatic LED lamps (435, 520, or 662 nm; 80 µmol m-2 s-1) or a mixed RGB spectrum (1:1:1; 180 µmol m-2 s-1) and simultaneously measured gs and Tleaf with an infrared gas analyser and a thermocouple or an infrared thermal camera (FLIR) during thermal imaging analyses. The results showed that growth light quality significantly modifies Tleaf and that such a response is not temporal. Furthermore, we found that the actual adaxial leaf surface temperature of plants is more closely related to NPQ amplitude, while the temperature of the abaxial surface corresponds to gs.
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Affiliation(s)
- Magdalena Trojak
- Department of Environmental Biology, Jan Kochanowski University of Kielce, Uniwersytecka 7, 25-406 Kielce, Poland;
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3
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Petjukevics A, Skute N. Chlorophyll fluorescence changes, as plant early state indicator under different water salinity regimes on the invasive macrophyte Elodea canadensis (Michx., 1803). ONE ECOSYSTEM 2022. [DOI: 10.3897/oneeco.7.e82389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Analysis of the photosynthetic apparatus provides information on the physiological state of plants. The changes of metabolites in plant cells analysed with the pulsed chlorophyll fluorometer make it possible to determine these changes in plant cells even in the presence of insignificant cell damage. The possible effects of different salinity levels, 0.584, 1.461, 2.922 and 5.844 PSU (denoting Practical Salinity Unit) on the fluorescence properties of the pigment complexes of the aquatic invasive E. canadensis photosynthetic apparatus were investigated. Information about E. canadensis macrophyte photosynthetic systems (PSI and PSII) was obtained. After a prolonged impact, the results indicate that high salinity levels in substrates 2.922 and 5.844 PSU seriously affect plant photosynthetic apparatus inhibition. The decrease in ∆Fv/Fm΄ values at 2.922 and 5.844 PSU indicates general deterioration in macrophytes' physiological state. In the post-stress period, photosynthesis intensified. An interesting feature was noted: a low water salinity level (0.584) stimulates chlorophyll formation and increases the FvFm parameter. The research revealed the influence of salinity levels in the substrate on the photosynthesis processes in plants. The PSII system of submerged macrophytes responds rapidly to high salinity levels, probably due to the inhibition of protein synthesis. These data provide information for further bio-diagnosis of overall plant health and prediction of exposure levels, as well as the ability to make predictions of invasive plant growth and spread. The invasion of this plant macrophyte causes the most serious concern in Europe nowadays.
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Serôdio J, Moreira D, Bastos A, Cardoso V, Frommlet J, Frankenbach S. Hysteresis light curves: a protocol for characterizing the time dependence of the light response of photosynthesis. PHOTOSYNTHESIS RESEARCH 2022; 154:57-74. [PMID: 36057004 DOI: 10.1007/s11120-022-00954-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Photosynthesis vs. light curves (LCs) have played a central role in photosynthesis research for decades. They are the commonest form of describing how photosynthesis responds to changes in light, being frequently used for characterizing photoacclimation. However, LCs are often interpreted exclusively regarding the response to light intensity, the effects of time of exposure not being explicitly considered. This study proposes the use of 'hysteresis light curves' (HLC), an experimental protocol focused on the cumulative effects of light exposure to obtain information on the time dependence of photosynthetic light responses. HLC are generated by exposing samples to a symmetrical sequence of increasing and decreasing light levels. The comparison of the light-increasing and the light-decreasing phases allows the quantification of the hysteresis caused by high-light exposure, the magnitude and direction of which inform on the activation, and subsequent relaxation of high-light-induced photosynthetic processes. HLCs of the chlorophyll fluorescence indices rETR (relative electron transport rate of photosystem II) and Y(NPQ) (index of non-photochemical quenching) were measured on cyanobacteria, algae, and plants, with the aim of identifying main patterns of hysteresis and their diversity. A non-parametric index is proposed to quantify the magnitude and direction of hysteresis in HLCs of rETR and Y(NPQ). The results of this study show that HLCs can provide additional relevant information on the time dependence of the light response of photosynthetic samples, not obtainable from conventional LCs, useful for phenotyping photosynthetic traits, including photoacclimation state and kinetics of light activation and relaxation of electron flow and energy dissipation processes.
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Affiliation(s)
- João Serôdio
- Department of Biology and CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal.
| | - Daniel Moreira
- Department of Biology and CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - Alexandra Bastos
- Department of Biology and CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - Vera Cardoso
- Department of Biology and CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - Jörg Frommlet
- Department of Biology and CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - Silja Frankenbach
- Department of Biology and CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
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Wang Y, Jiang Z, Lai Z, Yuan H, Zhang X, Jia Y, Zhang X. The self-adaption capability of microalgal biofilm under different light intensities: Photosynthetic parameters and biofilm microstructures. ALGAL RES 2021. [DOI: 10.1016/j.algal.2021.102383] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Huang MY, Wong SL, Weng JH. Rapid Light-Response Curve of Chlorophyll Fluorescence in Terrestrial Plants: Relationship to CO 2 Exchange among Five Woody and Four Fern Species Adapted to Different Light and Water Regimes. PLANTS (BASEL, SWITZERLAND) 2021; 10:445. [PMID: 33652840 PMCID: PMC7996942 DOI: 10.3390/plants10030445] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 02/23/2021] [Accepted: 02/23/2021] [Indexed: 11/24/2022]
Abstract
The rapid light response of electron transport rate (ETRR), obtained from chlorophyll fluorescence parameters by short illumination periods (10-30 s) at each light level, can provide a rapid and easy measurement of photosynthetic light response in plants. However, the relationship between ETRR and the steady-state light response of CO2 exchange rate (AS) of terrestrial plants has not been studied in detail. In this study, we compared the ETRR and AS for five woody and four fern species with different light and/or water adaptations. Under well-watered conditions, a constant temperature (25 °C) and with stomatal conductance (gs) not being a main limiting factor for photosynthesis, ETRR and AS were closely related, even when merging data for regression analysis for a species grown under different light conditions and measured under different light intensity and air humidity. However, when Alnus formosana was treated with low soil water and air humidity, because of the decrease in AS mainly due to stomatal closure, the ETRR-AS relation was not so close. In addition, at both 100 and 2000 μmol m-2 s-1 photosynthetic photon flux density (PPFD), ETRR and AS were significantly correlated within a plant group (i.e., woody plants and ferns) regardless of the broad difference in AS due to different species or environmental factors. The results indicate that the relationship between the ETRR and AS is varied by species. We concluded that 1) ETRR could reflect the variation in AS at each irradiance level within a species under well-watered conditions and 2) ETRR at 100 μmol m-2 s-1 PPFD (as the efficiency of light capture) or 2000 μmol m-2 s-1 PPFD (as a maximum photosynthetic parameter) could be used to compare the photosynthetic capacity within a plant group, such as woody plants and ferns.
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Affiliation(s)
- Meng-Yuan Huang
- Department of Life Sciences, National Chung-Hsing University, Taichung 40227, Taiwan;
| | - Shau-Lian Wong
- Division of Botany, Endemic Species Research Institute, Nantou 552, Taiwan;
| | - Jen-Hsien Weng
- Department of Life Sciences, National Chung-Hsing University, Taichung 40227, Taiwan;
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Matorin DN, Timofeev NP, Sindalovskaya ML, Shidlovskaya NA, Todorenko DA, Alekseev AA. Chlorophyll Fluorescence of Summer Phytoplankton in Reservoirs of the Zvenigorod Biological Station of Moscow State University. Biophysics (Nagoya-shi) 2020. [DOI: 10.1134/s0006350919060149] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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van der Heijden LH, Graeve M, Asmus R, Rzeznik-Orignac J, Niquil N, Bernier Q, Guillou G, Asmus H, Lebreton B. Trophic importance of microphytobenthos and bacteria to meiofauna in soft-bottom intertidal habitats: A combined trophic marker approach. MARINE ENVIRONMENTAL RESEARCH 2019; 149:50-66. [PMID: 31153060 DOI: 10.1016/j.marenvres.2019.05.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 04/22/2019] [Accepted: 05/20/2019] [Indexed: 06/09/2023]
Abstract
Meiofauna can play an important role in the carbon fluxes of soft-bottom coastal habitats. Investigation of their feeding behavior and trophic position remains challenging due to their small size. In this study, we determine and compare the food sources used by nematodes and benthic copepods by using stable isotope compositions, fatty acid profiles and compound specific isotope analyses of fatty acids in the mudflats, seagrass beds and a sandflat of the Marennes-Oléron Bay, France, and the Sylt-Rømø Bight, Germany. Suspended particulate organic matter was much more 13C-depleted than other food sources and meiofauna, highlighting its poor role in the different studied habitats. The very low proportions of vascular plant fatty acid markers in meiofauna demonstrated that these consumers did not rely on this food source, either fresh or detrital, even in seagrass beds. The combined use of stable isotopes and fatty acids emphasized microphytobenthos and benthic bacteria as the major food sources of nematodes and benthic copepods. Compound specific analyses of a bacteria marker confirmed that bacteria mostly used microphytobenthos as a substrate.
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Affiliation(s)
- L H van der Heijden
- UMR 7266 Littoral, Environment et Societies (CNRS - University of La Rochelle), Institute du littoral et de l'environnement, 2 rue Olympe de Gouges, 17000, La Rochelle, France; Alfred Wegener Institute Helmholtz Centre for Polar- and Marine Research, Wattenmeerstation Sylt, Hafenstraße 43, 25992, List, Sylt, Germany.
| | - M Graeve
- Alfred Wegener Institut Helmholtz Centre for Polar- and Marine Research, Am Handelshafen 12, 27570, Bremerhaven, Germany
| | - R Asmus
- Alfred Wegener Institute Helmholtz Centre for Polar- and Marine Research, Wattenmeerstation Sylt, Hafenstraße 43, 25992, List, Sylt, Germany
| | - J Rzeznik-Orignac
- UMR 8222 Laboratoire d'Ecogéochimie des Environnements Benthiques, (CNRS - Sorbonne Université), Observatoire Océanologique de Banyuls, 1 avenue Pierre Fabre, 66650, Banyuls-sur-Mer, France
| | - N Niquil
- UMR 7208 Unité Biologie des Organismes et Ecosystèmes Aquatiques (MNHN - CNRS - IRD - Sorbonne Université - Université de Caen Normandie - Université des Antilles), Esplanade de la Paix, 14000, CAEN, France
| | - Q Bernier
- UMR 7266 Littoral, Environment et Societies (CNRS - University of La Rochelle), Institute du littoral et de l'environnement, 2 rue Olympe de Gouges, 17000, La Rochelle, France
| | - G Guillou
- UMR 7266 Littoral, Environment et Societies (CNRS - University of La Rochelle), Institute du littoral et de l'environnement, 2 rue Olympe de Gouges, 17000, La Rochelle, France
| | - H Asmus
- Alfred Wegener Institute Helmholtz Centre for Polar- and Marine Research, Wattenmeerstation Sylt, Hafenstraße 43, 25992, List, Sylt, Germany
| | - B Lebreton
- UMR 7266 Littoral, Environment et Societies (CNRS - University of La Rochelle), Institute du littoral et de l'environnement, 2 rue Olympe de Gouges, 17000, La Rochelle, France
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9
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Jung AS, van der Veer HW, van der Meer MTJ, Philippart CJM. Seasonal variation in the diet of estuarine bivalves. PLoS One 2019; 14:e0217003. [PMID: 31206548 PMCID: PMC6579449 DOI: 10.1371/journal.pone.0217003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 05/02/2019] [Indexed: 11/23/2022] Open
Abstract
Estuarine food webs are generally considered to be supported by marine pelagic and benthic primary producers and by the import of dead organic matter from the open sea. Although estuaries receive considerable amounts of freshwater phytoplankton and organic compounds from adjacent rivers, the potential contribution of these living and dead matter to estuarine food webs is often assumed to be negligible and, therefore, not examined. Based on stable isotope analyses, we report the importance of freshwater suspended particulate organic matter (FW-SPOM) for fuelling estuarine food webs in comparison to estuarine SPOM and microphytobenthos. This previously neglected food source contributed 50–60% (annual average) of food intake of suspension-feeding bivalves such as cockles (Cerastoderma edule), mussels (Mytilus edulis) and Pacific oysters (Magallana gigas) at the Balgzand tidal flats, an estuarine site in the western Wadden Sea (12–32 psu). For these species, this proportion was particularly high in autumn during strong run-off of SPOM-rich freshwater, whilst estuarine SPOM (20%-25%) and microphytobenthos (15%-30%) were relatively important in summer when the freshwater run-off was very low. These findings have implications for our understanding of the trophic interactions within coastal food webs and for freshwater management of estuarine ecosystems.
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Affiliation(s)
- Alexa Sarina Jung
- NIOZ Royal Netherlands Institute for Sea Research, Department of Coastal Systems, Utrecht University, AB Den Burg, Texel, The Netherlands
- * E-mail:
| | - Henk W. van der Veer
- NIOZ Royal Netherlands Institute for Sea Research, Department of Coastal Systems, Utrecht University, AB Den Burg, Texel, The Netherlands
| | - Marcel T. J. van der Meer
- NIOZ Royal Netherlands Institute for Sea Research, Department of Microbiology & Biogeochemistry, Utrecht University, AB Den Burg, Texel, The Netherlands
| | - Catharina J. M. Philippart
- NIOZ Royal Netherlands Institute for Sea Research, Department of Coastal Systems, Utrecht University, AB Den Burg, Texel, The Netherlands
- University of Utrecht, Department of Physical Geography, TC Utrecht, The Netherlands
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Oh S, Montgomery BL. Roles of CpcF and CpcG1 in Peroxiredoxin-Mediated Oxidative Stress Responses and Cellular Fitness in the Cyanobacterium Synechocystis sp. PCC 6803. Front Microbiol 2019; 10:1059. [PMID: 31143173 PMCID: PMC6521580 DOI: 10.3389/fmicb.2019.01059] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 04/26/2019] [Indexed: 12/22/2022] Open
Abstract
As a component of the photosynthetic apparatus in cyanobacteria, the phycobilisome (PBS) plays an important role in harvesting and transferring light energy to the core photosynthetic reaction centers. The size, composition (phycobiliprotein and chromophore), and assembly of PBSs can be dynamic to cope with tuning photosynthesis and associated cellular fitness in variable light environments. Here, we explore the role of PBS-related stress responses by analyzing deletion mutants of cpcF or cpcG1 genes in Synechocystis sp. PCC 6803. The cpcF gene encodes a lyase that links the phycocyanobilin (PCB) chromophore to the alpha subunit of phycocyanin (PC), a central phycobiliprotein (PBP) in PBSs. Deletion of cpcF (i.e., ΔcpcF strain) resulted in slow growth, reduced greening, elevated reactive oxygen species (ROS) levels, together with an elevated accumulation of a stress-related Peroxiredoxin protein (Sll1621). Additionally, ΔcpcF exhibited reduced sensitivity to a photosynthesis-related stress inducer, methyl viologen (MV), which disrupts electron transfer. The cpcG1 gene encodes a linker protein that serves to connect PC to the core PBP allophycocyanin. A deletion mutant of cpcG1 (i.e.,ΔcpcG1) exhibited delayed growth, a defect in pigmentation, reduced accumulation of ROS, and insensitivity to MV treatment. By comparison, ΔcpcF and ΔcpcG1 exhibited similarity in growth, pigmentation, and stress responses; yet, these strains showed distinct phenotypes for ROS accumulation, sensitivity to MV and Sll1621 accumulation. Our data emphasize an importance of the regulation of PBS structure in ROS-mediated stress responses that impact successful growth and development in cyanobacteria.
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Affiliation(s)
- Sookyung Oh
- MSU-DOE Plant Research Laboratory, College of Natural Science, Michigan State University, East Lansing, MI, United States
| | - Beronda L. Montgomery
- MSU-DOE Plant Research Laboratory, College of Natural Science, Michigan State University, East Lansing, MI, United States
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, United States
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, United States
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Kulikova NA, Polyakov AY, Lebedev VA, Abroskin DP, Volkov DS, Pankratov DA, Klein OI, Senik SV, Sorkina TA, Garshev AV, Veligzhanin AA, Garcia Mina JM, Perminova IV. Key Roles of Size and Crystallinity of Nanosized Iron Hydr(oxides) Stabilized by Humic Substances in Iron Bioavailability to Plants. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:11157-11169. [PMID: 29206449 DOI: 10.1021/acs.jafc.7b03955] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Availability of Fe in soil to plants is closely related to the presence of humic substances (HS). Still, the systematic data on applicability of iron-based nanomaterials stabilized with HS as a source for plant nutrition are missing. The goal of our study was to establish a connection between properties of iron-based materials stabilized by HS and their bioavailability to plants. We have prepared two samples of leonardite HS-stabilized iron-based materials with substantially different properties using the reported protocols and studied their physical chemical state in relation to iron uptake and other biological effects. We used Mössbauer spectroscopy, XRD, SAXS, and TEM to conclude on iron speciation, size, and crystallinity. One material (Fe-HA) consisted of polynuclear iron(III) (hydr)oxide complexes, so-called ferric polymers, distributed in HS matrix. These complexes are composed of predominantly amorphous small-size components (<5 nm) with inclusions of larger crystalline particles (the mean size of (11 ± 4) nm). The other material was composed of well-crystalline feroxyhyte (δ'-FeOOH) NPs with mean transverse sizes of (35 ± 20) nm stabilized by small amounts of HS. Bioavailability studies were conducted on wheat plants under conditions of iron deficiency. The uptake studies have shown that small and amorphous ferric polymers were readily translocated into the leaves on the level of Fe-EDTA, whereas relatively large and crystalline feroxyhyte NPs were mostly sorbed on the roots. The obtained data are consistent with the size exclusion limits of cell wall pores (5-20 nm). Both samples demonstrated distinct beneficial effects with respect to photosynthetic activity and lipid biosynthesis. The obtained results might be of use for production of iron-based nanomaterials stabilized by HS with the tailored iron availability to plants. They can be applied as the only source for iron nutrition as well as in combination with the other elements, for example, for industrial production of "nanofortified" macrofertilizers (NPK).
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Affiliation(s)
- Natalia A Kulikova
- Department of Soil Science, Lomonosov Moscow State University , Leninskie gory 1-12, 119991 Moscow, Russia
- Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1-3, 119991 Moscow, Russia
- Bach Institute of Biochemistry, Fundamentals of Biotechnology Federal Research Center, Russian Academy of Sciences , pr. Leninskii 33, 119071 Moscow, Russia
| | - Alexander Yu Polyakov
- Department of Materials Science, Lomonosov Moscow State University , Leninskie gory 1-73, 119991 Moscow, Russia
| | - Vasily A Lebedev
- Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1-3, 119991 Moscow, Russia
- Department of Materials Science, Lomonosov Moscow State University , Leninskie gory 1-73, 119991 Moscow, Russia
| | - Dmitry P Abroskin
- Department of Soil Science, Lomonosov Moscow State University , Leninskie gory 1-12, 119991 Moscow, Russia
| | - Dmitry S Volkov
- Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1-3, 119991 Moscow, Russia
| | - Denis A Pankratov
- Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1-3, 119991 Moscow, Russia
| | - Olga I Klein
- Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1-3, 119991 Moscow, Russia
- Bach Institute of Biochemistry, Fundamentals of Biotechnology Federal Research Center, Russian Academy of Sciences , pr. Leninskii 33, 119071 Moscow, Russia
| | - Svetlana V Senik
- Komarov Botanical Institute, Russian Academy of Sciences , ul. Professora Popova 2, 197376 St. Petersburg, Russia
| | - Tatiana A Sorkina
- Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1-3, 119991 Moscow, Russia
- Science & Technology Department, Rusnano LLC. , 10A, prospect 60-letia Oktyabrya, 117036 Moscow, Russia
| | - Alexey V Garshev
- Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1-3, 119991 Moscow, Russia
- Department of Materials Science, Lomonosov Moscow State University , Leninskie gory 1-73, 119991 Moscow, Russia
| | - Alexey A Veligzhanin
- National Research Center "Kurchatov Institute" , 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Jose M Garcia Mina
- Department of Environmental Biology, BACh group, Sciences School, University of Navarra , C/Irunlarrea 1, 31008 na, Pamplona, Spain
| | - Irina V Perminova
- Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1-3, 119991 Moscow, Russia
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David H, Laza-Martínez A, Kromkamp JC, Orive E. Physiological response of Prorocentrum lima (Dinophyceae) to varying light intensities. FEMS Microbiol Ecol 2017; 94:4705884. [DOI: 10.1093/femsec/fix166] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 11/29/2017] [Indexed: 11/12/2022] Open
Affiliation(s)
- Helena David
- Department of Plant Biology and Ecology, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain
| | - Aitor Laza-Martínez
- Department of Plant Biology and Ecology, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain
| | - Jacco C Kromkamp
- Department of Estuarine and Delta Systems and Utrecht University, NIOZ Royal Institute for Sea Research, P.O. Box 140, 4401 NT Yerseke, The Netherlands
| | - Emma Orive
- Department of Plant Biology and Ecology, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain
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Trophic relationship between the invasive parasitic copepod Mytilicola orientalis and its native blue mussel (Mytilus edulis) host. Parasitology 2017; 145:814-821. [DOI: 10.1017/s0031182017001779] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
AbstractInvasive parasites can spill over to new hosts in invaded ecosystems with often unpredictable trophic relationships in the newly arising parasite-host interactions. In European seas, the intestinal copepod Mytilicola orientalis was co-introduced with Pacific oysters (Magallana gigas) and spilled over to native blue mussels (Mytilus edulis), with negative impacts on the condition of infected mussels. However, whether the parasite feeds on host tissue and/or stomach contents is yet unknown. To answer this question, we performed a stable isotope analysis in which we included mussel host tissue and the primary food sources of the mussels, microphytobenthos (MPB) and particulate organic matter (POM). The copepods were slightly enriched in δ15N (mean Δ15N ± s.d.; 1·22 ± 0·58‰) and δ13C (Δ13C 0·25 ± 0·32‰) with respect to their host. Stable isotope mixing models using a range of trophic fractionation factors indicated that host tissue was the main food resource with consistent additional contributions of MPB and POM. These results suggest that the trophic relationship of the invasive copepod with its mussel host is parasitic as well as commensalistic. Stable isotope studies such as this one may be a useful tool to unravel trophic relationships in new parasite-host associations in the course of invasions.
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Figueroa FL, Álvarez-Gómez F, del Rosal Y, Celis-Plá PS, González G, Hernández M, Korbee N. In situ photosynthetic yields of cave photoautotrophic biofilms using two different Pulse Amplitude Modulated fluorometers. ALGAL RES 2017. [DOI: 10.1016/j.algal.2016.12.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Li M, Shi X, Guo C, Lin S. Phosphorus Deficiency Inhibits Cell Division But Not Growth in the Dinoflagellate Amphidinium carterae. Front Microbiol 2016; 7:826. [PMID: 27313570 PMCID: PMC4887478 DOI: 10.3389/fmicb.2016.00826] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 05/17/2016] [Indexed: 12/03/2022] Open
Abstract
Phosphorus (P) is an essential nutrient element for the growth of phytoplankton. How P deficiency affects population growth and the cell division cycle in dinoflagellates has only been studied in some species, and how it affects photosynthesis and cell growth remains poorly understood. In the present study, we investigated the impact of P deficiency on the cell division cycle, the abundance of the carbon-fixing enzyme Rubisco, and other cellular characteristics in the Gymnodiniales peridinin-plastid species Amphidinium carterae. We found that under P-replete condition, the cell cycle actively progressed in the culture in a 24-h diel cycle with daily growth rates markedly higher than the P-deficient cultures, in which cells were arrested in the G1 phase and cell size significantly enlarged. The results suggest that, as in previously studied dinoflagellates, P deficiency likely disenables A. carterae to complete DNA duplication or check-point protein phosphorylation. We further found that under P-deficient condition, overall photosystem II quantum efficiency (Fv/Fm ratio) and Rubisco abundance decreased but not significantly, while cellular contents of carbon, nitrogen, and proteins increased significantly. These observations indicated that under P-deficiency, this dinoflagellate was able to continue photosynthesis and carbon fixation, such that proteins and photosynthetically fixed carbon could accumulate resulting in continued cell growth in the absence of division. This is likely an adaptive strategy thereby P-limited cells can be ready to resume the cell division cycle upon resupply of phosphorus.
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Affiliation(s)
- Meizhen Li
- State Key Laboratory of Marine Environmental Science and Marine Biodiversity and Global Change Research Center, Xiamen UniversityXiamen, China
| | - Xinguo Shi
- State Key Laboratory of Marine Environmental Science and Marine Biodiversity and Global Change Research Center, Xiamen UniversityXiamen, China
| | - Chentao Guo
- State Key Laboratory of Marine Environmental Science and Marine Biodiversity and Global Change Research Center, Xiamen UniversityXiamen, China
| | - Senjie Lin
- State Key Laboratory of Marine Environmental Science and Marine Biodiversity and Global Change Research Center, Xiamen UniversityXiamen, China
- Department of Marine Sciences, University of Connecticut, GrotonCT, USA
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Protopopov FF, Matorin DN, Seifullina NK, Bratkovskaya LB, Zayadan BK. Effect of methylmercury on the light dependence fluorescence parameters in a green alga Chlamydomonas moewusii. Microbiology (Reading) 2015. [DOI: 10.1134/s0026261715060119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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17
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Li T, Podola B, de Beer D, Melkonian M. A method to determine photosynthetic activity from oxygen microsensor data in biofilms subjected to evaporation. J Microbiol Methods 2015; 117:100-7. [DOI: 10.1016/j.mimet.2015.07.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 07/27/2015] [Accepted: 07/27/2015] [Indexed: 01/05/2023]
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Gamayunov EL, Popik AY. Dependence of fluorescence in phytoplankton on external exposures. Biophysics (Nagoya-shi) 2015. [DOI: 10.1134/s0006350915010108] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Saleh MM, Matorin DN, Zayadan BK, Todorenko DA, Lukashov EP, Gaballah MM. Differentiation between two strains of microalga Parachlorella kessleri using modern spectroscopic method. BOTANICAL STUDIES 2014; 55:53. [PMID: 28510974 PMCID: PMC5430349 DOI: 10.1186/s40529-014-0053-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 06/23/2014] [Indexed: 06/07/2023]
Abstract
BACKGROUND The differentiation between wild type of Parachlorella kessleri and its mutant strains PC Mut2, PC Mut4 by using the Multi-functional Plant Efficiency Analyzer (М-РЕА-2) was studied. Mutant algal cells of P. kessleri have been obtained by UV-C during 3 and 10 min respectively. RESULTS Light-induced kinetics of prompt fluorescence (OJIP transients), delayed fluorescence and modulated reflection at 820 nm (redox transitions of P700 in PSI) showed disturbance of electron transport flow in photosystem II (PSII) and an increase fraction of non-reducing centers of secondary quinone acceptors of electron (QB). In addition, the amplitudes of the fast and slow peak in the kinetics of the delayed light emission and non-photochemical fluorescence quenching ( NPQ) were significantly reduced in mutant cells, indicating low level of the membrane energization of photosynthetic membranes. Changes of photosynthetic reactions of mutants may lead to an increase of the carotenoids content, which protect cells against the light stress. CONCLUSION It is suggested to use parameters of induction curves of prompt and delayed fluorescence to characterize mutant algal cells in biotechnological studies.
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Affiliation(s)
- Marwa M Saleh
- Department of Biotechnology, Al-Farabi Kazakh National University, 71, Al-Farabi, ave, Almaty, 050040 Kazakhstan
- Botany Department, Faculty of Science, Suez Canal University, Ismaillia, 41522 Egypt
| | - Dmitry N Matorin
- Faculty of Biology, Moscow State University, Vorobyevi Gory, 119992 Moscow Russia
| | - Bolatkhan K Zayadan
- Department of Biotechnology, Al-Farabi Kazakh National University, 71, Al-Farabi, ave, Almaty, 050040 Kazakhstan
| | - Daria A Todorenko
- Faculty of Biology, Moscow State University, Vorobyevi Gory, 119992 Moscow Russia
| | - Evgenii P Lukashov
- Faculty of Biology, Moscow State University, Vorobyevi Gory, 119992 Moscow Russia
| | - Mona M Gaballah
- Botany Department, Faculty of Science, Suez Canal University, Ismaillia, 41522 Egypt
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García-Sánchez M, Korbee N, Pérez-Ruzafa IM, Marcos C, Figueroa FL, Pérez-Ruzafa Á. Living in a coastal lagoon environment: photosynthetic and biochemical mechanisms of key marine macroalgae. MARINE ENVIRONMENTAL RESEARCH 2014; 101:8-21. [PMID: 25164017 DOI: 10.1016/j.marenvres.2014.07.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 07/22/2014] [Accepted: 07/29/2014] [Indexed: 06/03/2023]
Abstract
The physiological status of Cystoseira compressa, Padina pavonica and Palisada tenerrima was studied by in vivo chlorophyll fluorescence, pigment content, stoichiometry (C:N), accumulation of UV photoprotectors and antioxidant activity; comparing their photosynthetic response in a coastal lagoon (Mar Menor) and in Mediterranean coastal waters. In general, the specimens reached their highest ETRmax in spring in the Lagoon, but in summer in the Mediterranean, coinciding with their maximum biomass peak. The species exhibited a dynamic photoinhibition. Except C. compressa, they showed a lower decrease in Fv/Fm and higher recovery rates in the Mediterranean populations when exposed to high irradiance. The higher salinity and temperature of the lagoon could impair the photoprotection mechanisms. The acclimation to lagoon environments is species-specific and involves complex regulatory mechanisms. The results underline the importance of N in repair, avoidance, quenching and scavenging mechanisms. In general, Lagoon specimens showed higher pigment concentration. Although xanthophylls play important photo-protective and antioxidant roles, the observed trend is more likely to be explained by the higher temperatures reached in the lagoon compared to Mediterranean. Therefore the studied photosynthetic and biochemical mechanisms can be effective not only for high irradiance, but also for higher temperatures in a climate change scenario, but are highly dependent on nutrient availability.
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Affiliation(s)
- Marta García-Sánchez
- Departamento de Ecología e Hidrología, Facultad de Biología, Campus de Espinardo, Regional Campus of International Excellence "Campus Mare Nostrum", Universidad de Murcia, Murcia 30100, Spain.
| | - Nathalie Korbee
- Departamento de Ecología y Geología, Facultad de Ciencias, Universidad de Málaga, Málaga 29071, Spain
| | - Isabel María Pérez-Ruzafa
- Departamento de Biología Vegetal I, Facultad de Biología, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Concepción Marcos
- Departamento de Ecología e Hidrología, Facultad de Biología, Campus de Espinardo, Regional Campus of International Excellence "Campus Mare Nostrum", Universidad de Murcia, Murcia 30100, Spain
| | - Félix L Figueroa
- Departamento de Ecología y Geología, Facultad de Ciencias, Universidad de Málaga, Málaga 29071, Spain
| | - Ángel Pérez-Ruzafa
- Departamento de Ecología e Hidrología, Facultad de Biología, Campus de Espinardo, Regional Campus of International Excellence "Campus Mare Nostrum", Universidad de Murcia, Murcia 30100, Spain
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Serôdio J, Ezequiel J, Frommlet J, Laviale M, Lavaud J. A method for the rapid generation of nonsequential light-response curves of chlorophyll fluorescence. PLANT PHYSIOLOGY 2013; 163:1089-102. [PMID: 24067245 PMCID: PMC3813635 DOI: 10.1104/pp.113.225243] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Light-response curves (LCs) of chlorophyll fluorescence are widely used in plant physiology. Most commonly, LCs are generated sequentially, exposing the same sample to a sequence of distinct actinic light intensities. These measurements are not independent, as the response to each new light level is affected by the light exposure history experienced during previous steps of the LC, an issue particularly relevant in the case of the popular rapid light curves. In this work, we demonstrate the proof of concept of a new method for the rapid generation of LCs from nonsequential, temporally independent fluorescence measurements. The method is based on the combined use of sample illumination with digitally controlled, spatially separated beams of actinic light and a fluorescence imaging system. It allows the generation of a whole LC, including a large number of actinic light steps and adequate replication, within the time required for a single measurement (and therefore named "single-pulse light curve"). This method is illustrated for the generation of LCs of photosystem II quantum yield, relative electron transport rate, and nonphotochemical quenching on intact plant leaves exhibiting distinct light responses. This approach makes it also possible to easily characterize the integrated dynamic light response of a sample by combining the measurement of LCs (actinic light intensity is varied while measuring time is fixed) with induction/relaxation kinetics (actinic light intensity is fixed and the response is followed over time), describing both how the response to light varies with time and how the response kinetics varies with light intensity.
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Herlory O, Bonzom JM, Gilbin R, Frelon S, Fayolle S, Delmas F, Coste M. Use of diatom assemblages as biomonitor of the impact of treated uranium mining effluent discharge on a stream: case study of the Ritord watershed (Center-West France). ECOTOXICOLOGY (LONDON, ENGLAND) 2013; 22:1186-1199. [PMID: 23903932 DOI: 10.1007/s10646-013-1106-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/18/2013] [Indexed: 06/02/2023]
Abstract
The rehabilitation of French former uranium mining sites has not prevented the contamination of the surrounding aquatic ecosystems with metal elements. This study assesses the impact of the discharge of treated uranium mining effluents on periphytic diatom communities to evaluate their potential of bioindication. A 7-month survey was conducted on the Ritord watercourse to measure the environmental conditions of microalgae, the non-taxonomic attributes of periphyton (photosynthesis and biomass) and to determine the specific composition of diatom assemblages grown on artificial substrates. The environmental conditions were altered by the mine waters, that contaminate the watercourse with uranium and with chemicals used in the pit-water treatment plants (BaCl2 and Al2(SO4)3). The biomass and photosynthetic activity of periphyton seemed not to respond to the stress induced by the treated mining effluents whereas the altered environmental conditions clearly impacted the composition of diatom communities. Downstream the discharges, the communities tended to be characterized by indicator species belonging to the genera Fragilaria, Eunotia and Brachysira and were highly similar to assemblages at acid mine drainage sites. The species Eunotia pectinalis var. undulata, Psammothidium rechtensis, Gomphonema lagenula and Pinnularia major were found to be sensitive to uranium effluents whereas Neidium alpinum and several species of Gomphonema tolerated this contamination. The relevance of diatoms as ecological indicator was illustrated through the changes in structure of communities induced by the discharge of uranium mining effluents and creates prospects for development of a bioindicator tool for this kind of impairment of water quality.
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Affiliation(s)
- Olivier Herlory
- Laboratoire d'Ecotoxicologie des Radionucléides, Centre de Cadarache, IRSN, BP3, 13115, Saint Paul Lez Durance, France,
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Pfündel EE, Klughammer C, Meister A, Cerovic ZG. Deriving fluorometer-specific values of relative PSI fluorescence intensity from quenching of F(0) fluorescence in leaves of Arabidopsis thaliana and Zea mays. PHOTOSYNTHESIS RESEARCH 2013; 114:189-206. [PMID: 23196877 DOI: 10.1007/s11120-012-9788-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Accepted: 11/09/2012] [Indexed: 05/22/2023]
Abstract
The effect of stepwise increments of red light intensities on pulse-amplitude modulated (PAM) chlorophyll (Chl) fluorescence from leaves of A. thaliana and Z. mays was investigated. Minimum and maximum fluorescence were measured before illumination (F(0) and F(M), respectively) and at the end of each light step (F'(0) and F'(M), respectively). Calculated F'(0) values derived from F(0), F(M) and F'(M) fluorescence according to Oxborough and Baker (1997) were lower than the corresponding measured F'(0) values. Based on the concept that calculated F'(0) values are under-estimated because the underlying theory ignores PSI fluorescence, a method was devised to gain relative PSI fluorescence intensities from differences between calculated and measured F'(0). This method yields fluorometer-specific PSI data as its input data (F(0), F(M), F'(0) and F'(M)) depend solely on the spectral properties of the fluorometer used. Under the present conditions, the PSI contribution to F (0) fluorescence was 0.24 in A. thaliana and it was independent on the light acclimation status; the corresponding value was 0.50 in Z. mays. Correction for PSI fluorescence affected Z. mays most: the linear relationship between PSI and PSII photochemical yields was clearly shifted toward the one-to-one proportionality line and maximum electron transport was increased by 50 %. Further, correction for PSI fluorescence increased the PSII reaction center-specific parameter, 1/F(0) - 1/F(M), up to 50 % in A. thaliana and up to 400 % in Z. mays.
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Affiliation(s)
- Erhard E Pfündel
- Lehrstuhl für Botanik II der Universität Würzburg, Julius-von-Sachs Institut für Biowissenschaften, 97082 Würzburg, Germany.
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Schreiber U, Klughammer C, Kolbowski J. Assessment of wavelength-dependent parameters of photosynthetic electron transport with a new type of multi-color PAM chlorophyll fluorometer. PHOTOSYNTHESIS RESEARCH 2012; 113:127-44. [PMID: 22729479 PMCID: PMC3430841 DOI: 10.1007/s11120-012-9758-1] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Accepted: 06/08/2012] [Indexed: 05/07/2023]
Abstract
Technical features of a novel multi-color pulse amplitude modulation (PAM) chlorophyll fluorometer as well as the applied methodology and some typical examples of its practical application with suspensions of Chlorella vulgaris and Synechocystis PCC 6803 are presented. The multi-color PAM provides six colors of pulse-modulated measuring light (peak-wavelengths at 400, 440, 480, 540, 590, and 625 nm) and six colors of actinic light (AL), peaking at 440, 480, 540, 590, 625 and 420-640 nm (white). The AL can be used for continuous illumination, maximal intensity single-turnover pulses, high intensity multiple-turnover pulses, and saturation pulses. In addition, far-red light (peaking at 725 nm) is provided for preferential excitation of PS I. Analysis of the fast fluorescence rise kinetics in saturating light allows determination of the wavelength- and sample-specific functional absorption cross section of PS II, Sigma(II)(λ), with which the PS II turnover rate at a given incident photosynthetically active radiation (PAR) can be calculated. Sigma(II)(λ) is defined for a quasi-dark reference state, thus differing from σ(PSII) used in limnology and oceanography. Vastly different light response curves for Chlorella are obtained with light of different colors, when the usual PAR-scale is used. Based on Sigma(II)(λ) the PAR, in units of μmol quanta/(m(2) s), can be converted into PAR(II) (in units of PS II effective quanta/s) and a fluorescence-based electron transport rate ETR(II) = PAR(II) · Y(II)/Y(II)(max) can be defined. ETR(II) in contrast to rel.ETR qualifies for quantifying the absolute rate of electron transport in optically thin suspensions of unicellular algae and cyanobacteria. Plots of ETR(II) versus PAR(II) for Chlorella are almost identical using either 440 or 625 nm light. Photoinhibition data are presented suggesting that a lower value of ETR(II)(max) with 440 nm possibly reflects photodamage via absorption by the Mn-cluster of the oxygen-evolving complex.
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Affiliation(s)
- Ulrich Schreiber
- Julius-von-Sachs Institut für Biowissenschaften, Universität Würzburg, Julius-von-Sachs Platz 2, 97082, Würzburg, Germany.
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Serôdio J, Lavaud J. A model for describing the light response of the nonphotochemical quenching of chlorophyll fluorescence. PHOTOSYNTHESIS RESEARCH 2011; 108:61-76. [PMID: 21516348 DOI: 10.1007/s11120-011-9654-0] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Accepted: 04/04/2011] [Indexed: 05/30/2023]
Abstract
The operation of photosynthetic energy-dissipating processes is commonly characterized by measuring the light response of the nonphotochemical quenching (NPQ) of chlorophyll fluorescence, or NPQ versus E curves. This study proposes a mathematical model for the quantitative description of the generic NPQ versus E curve. The model is an adaptation of the Hill equation and is based on the close dependence of NPQ on the xanthophyll cycle (XC). The model was tested on NPQ versus E curves measured in the plant Arabidopsis thaliana and the diatom Nitzschia palea, representing the two main types of XC, the violaxanthin-antheraxanthin-zeaxanthin (VAZ) type and the diadinoxanthin-diatoxanthin (DD-DT) type, respectively. The model was also fitted to a large number of published light curves, covering the widest possible range of XC types, taxa, growth conditions, and experimental protocol of curve generation. The model provided a very good fit to experimental and published data, coping with the large variability in curve characteristics. The model was further used to quantitatively compare the light responses of NPQ and of PSII electron transport rate, ETR, through the use of indices combining parameters of the models describing the two types of light-response curves. Their application to experimental and published data showed a systematic large delay of the buildup of NPQ relatively to the saturation of photochemistry. It was found that when ETR reaches saturation, NPQ is on average still below one fifth of its maximum attainable level, which is only reached at irradiances about three times higher. It was also found that organisms having the DD-DT type of XC appeared to be able to start operating the XC at lower irradiances than those of the VAZ type.
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Affiliation(s)
- João Serôdio
- Departamento de Biologia and CESAM-Centro de Estudos do Ambiente e do Mar, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal.
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Matorin DN, Karateyeva AV, Osipov VA, Lukashev EP, Seifullina NK, Rubin AB. Influence of carbon nanotubes on chlorophyll fluorescence parameters of green algae Chlamydomonas reinhardtii. ACTA ACUST UNITED AC 2010. [DOI: 10.1134/s199507801005006x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Copertino MS, Cheshire A, Kildea T. PHOTOPHYSIOLOGY OF A TURF ALGAL COMMUNITY: INTEGRATED RESPONSES TO AMBIENT LIGHT AND STANDING BIOMASS(1). JOURNAL OF PHYCOLOGY 2009; 45:324-336. [PMID: 27033811 DOI: 10.1111/j.1529-8817.2009.00664.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This study investigated the variation in the relationship between photosynthesis and ambient light (P-E curves) for turf algal communities on a temperate reef off the coast of South Australia, analyzing the integrated effects of ambient light and standing biomass. The photophysiology of turfs was studied in situ on a seasonal basis, examining algal communities growing on artificial substrate (plates) at depths of 4 m and 10 m. P-E curves and estimates for the photokinetic parameters (Pm , Rd , α, Ek , and Ec ) were obtained through oxygen evolution methods, using an automated underwater respirometer. Photoacclimation responses to changes in ambient light were strongly affected by the biomass of the community. Pm showed an inverse relationship to standing biomass, irrespective of depth and season, which was considered to be a response to self-shading and boundary layer effects. Biomass effects imposed a high variance on estimates for all photosynthetic parameters, overshadowing differences observed for season and depth. Biomass also affected photoinhibition on turf communities, where significant afternoon depression of photosynthesis was observed in sparse turf patches when compared to denser patches. High areal productivity rates were maintained across all seasons with a significant decrease only being observed during winter.
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Affiliation(s)
- Margareth S Copertino
- Lab. Ecologia Vegetal Costeira, Instituto de Oceanografia, Universidade Federal do Rio Grande, c.p. 474, 96201-900, Rio Grande, Rio Grande do Sul, BrazilScience to Manage Uncertainty, 24 Winding Way, Belair, South Australia 5052, AustraliaAustralian Water Quality Centre, PMB 3, Salisbury, South Australia 5108, Australia
| | - Anthony Cheshire
- Lab. Ecologia Vegetal Costeira, Instituto de Oceanografia, Universidade Federal do Rio Grande, c.p. 474, 96201-900, Rio Grande, Rio Grande do Sul, BrazilScience to Manage Uncertainty, 24 Winding Way, Belair, South Australia 5052, AustraliaAustralian Water Quality Centre, PMB 3, Salisbury, South Australia 5108, Australia
| | - Tim Kildea
- Lab. Ecologia Vegetal Costeira, Instituto de Oceanografia, Universidade Federal do Rio Grande, c.p. 474, 96201-900, Rio Grande, Rio Grande do Sul, BrazilScience to Manage Uncertainty, 24 Winding Way, Belair, South Australia 5052, AustraliaAustralian Water Quality Centre, PMB 3, Salisbury, South Australia 5108, Australia
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