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Busch A, Gerbracht JV, Davies K, Hoecker U, Hess S. Comparative transcriptomics elucidates the cellular responses of an aeroterrestrial zygnematophyte to UV radiation. JOURNAL OF EXPERIMENTAL BOTANY 2024; 75:3624-3642. [PMID: 38520340 PMCID: PMC11156808 DOI: 10.1093/jxb/erae131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 03/22/2024] [Indexed: 03/25/2024]
Abstract
The zygnematophytes are the closest relatives of land plants and comprise several lineages that adapted to a life on land. Species of the genus Serritaenia form colorful, mucilaginous capsules, which surround the cells and block harmful solar radiation, one of the major terrestrial stressors. In eukaryotic algae, this 'sunscreen mucilage' represents a unique photoprotective strategy, whose induction and chemical background are unknown. We generated a de novo transcriptome of Serritaenia testaceovaginata and studied its gene regulation under moderate UV radiation (UVR) that triggers sunscreen mucilage under experimental conditions. UVR induced the repair of DNA and the photosynthetic apparatus as well as the synthesis of aromatic specialized metabolites. Specifically, we observed pronounced expressional changes in the production of aromatic amino acids, phenylpropanoid biosynthesis genes, potential cross-membrane transporters of phenolics, and extracellular, oxidative enzymes. Interestingly, the most up-regulated enzyme was a secreted class III peroxidase, whose embryophyte homologs are involved in apoplastic lignin formation. Overall, our findings reveal a conserved, plant-like UVR perception system (UVR8 and downstream factors) in zygnematophyte algae and point to a polyphenolic origin of the sunscreen pigment of Serritaenia, whose synthesis might be extracellular and oxidative, resembling that of plant lignins.
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Affiliation(s)
- Anna Busch
- Department of Biology, University of Cologne, Zülpicher Str. 47b, D-50674 Cologne, Germany
| | - Jennifer V Gerbracht
- Department of Biology, University of Cologne, Zülpicher Str. 47b, D-50674 Cologne, Germany
| | - Kevin Davies
- The New Zealand Institute for Plant and Food Research Limited, Private Bag 11600, Palmerston North 4442, New Zealand
| | - Ute Hoecker
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), Biocenter, University of Cologne, Zülpicher Strasse 47b, D-50674, Cologne, Germany
| | - Sebastian Hess
- Department of Biology, University of Cologne, Zülpicher Str. 47b, D-50674 Cologne, Germany
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2
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Duperron S, Halary S, Bouly JP, Roussel T, Hugoni M, Bruto M, Oger PM, Duval C, Woo A, Jézéquel D, Ader M, Leboulanger C, Agogué H, Grossi V, Troussellier M, Bernard C. Transcriptomic insights into the dominance of two phototrophs throughout the water column of a tropical hypersaline-alkaline crater lake (Dziani Dzaha, Mayotte). Front Microbiol 2024; 15:1368523. [PMID: 38741748 PMCID: PMC11089139 DOI: 10.3389/fmicb.2024.1368523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 04/08/2024] [Indexed: 05/16/2024] Open
Abstract
Saline-alkaline lakes often shelter high biomasses despite challenging conditions, owing to the occurrence of highly adapted phototrophs. Dziani Dzaha (Mayotte) is one such lake characterized by the stable co-dominance of the cyanobacterium Limnospira platensis and the picoeukaryote Picocystis salinarum throughout its water column. Despite light penetrating only into the uppermost meter, the prevailing co-dominance of these species persists even in light- and oxygen-deprived zones. Here, a depth profile of phototrophs metatranscriptomes, annotated using genomic data from isolated strains, is employed to identify expression patterns of genes related to carbon processing pathways including photosynthesis, transporters and fermentation. The findings indicate a prominence of gene expression associated with photosynthesis, with a peak of expression around 1 m below the surface, although the light intensity is very low and only red and dark red wavelengths can reach it, given the very high turbidity linked to the high biomass of L. platensis. Experiments on strains confirmed that both species do grow under these wavelengths, at rates comparable to those obtained under white light. A decrease in the expression of photosynthesis-related genes was observed in L. platensis with increasing depth, whereas P. salinarum maintained a very high pool of psbA transcripts down to the deepest point as a possible adaptation against photodamage, in the absence and/or very low levels of expression of genes involved in protection. In the aphotic/anoxic zone, expression of genes involved in fermentation pathways suggests active metabolism of reserve or available dissolved carbon compounds. Overall, L. platensis seems to be adapted to the uppermost water layer, where it is probably maintained thanks to gas vesicles, as evidenced by high expression of the gvpA gene. In contrast, P. salinarum occurs at similar densities throughout the water column, with a peak in abundance and gene expression levels which suggests a better adaptation to lower light intensities. These slight differences may contribute to limited inter-specific competition, favoring stable co-dominance of these two phototrophs.
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Affiliation(s)
- Sébastien Duperron
- UMR 7245 MCAM, Muséum National d’Histoire Naturelle – CNRS, Paris, France
| | - Sébastien Halary
- UMR 7245 MCAM, Muséum National d’Histoire Naturelle – CNRS, Paris, France
| | - Jean-Pierre Bouly
- UMR 7245 MCAM, Muséum National d’Histoire Naturelle – CNRS, Paris, France
| | - Théotime Roussel
- UMR 7245 MCAM, Muséum National d’Histoire Naturelle – CNRS, Paris, France
| | - Myléne Hugoni
- Université Claude Bernard Lyon 1, CNRS, INSA de Lyon, UMR 5240 Microbiologie Adaptation et Pathogénie, University of Lyon, Villeurbanne, France
- Institut Universitaire de France, Paris, France
| | - Maxime Bruto
- Anses, UMR Mycoplasmoses Animales, VetAgro Sup, Université de Lyon, Marcy-l’Étoile, France
| | - Philippe M. Oger
- Université Claude Bernard Lyon 1, CNRS, INSA de Lyon, UMR 5240 Microbiologie Adaptation et Pathogénie, University of Lyon, Villeurbanne, France
| | - Charlotte Duval
- UMR 7245 MCAM, Muséum National d’Histoire Naturelle – CNRS, Paris, France
| | - Anthony Woo
- Pôle Analyse de Données UAR 2700 2AD, Muséum National d’Histoire Naturelle, Paris, France
| | - Didier Jézéquel
- Institut de Physique du Globe de Paris, Université de Paris Cité, CNRS, Paris, France
- UMR CARRTEL, INRAE-USMB, Thonon-les-Bains, France
| | - Magali Ader
- Institut de Physique du Globe de Paris, Université de Paris Cité, CNRS, Paris, France
- UMR CARRTEL, INRAE-USMB, Thonon-les-Bains, France
| | | | - Hélène Agogué
- Littoral Environnement et Sociétés, UMR 7266, CNRS La Rochelle Université, La Rochelle, France
| | - Vincent Grossi
- LGL-TPE, UMR 5276, CNRS, ENSL, Université Claude Bernard Lyon 1, Villeurbanne, France
| | | | - Cécile Bernard
- UMR 7245 MCAM, Muséum National d’Histoire Naturelle – CNRS, Paris, France
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Mao Y, Lin T, Li H, He R, Ye K, Yu W, He Q. Aerobic methane production by phytoplankton as an important methane source of aquatic ecosystems: Reconsidering the global methane budget. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 907:167864. [PMID: 37866611 DOI: 10.1016/j.scitotenv.2023.167864] [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: 08/10/2023] [Revised: 10/09/2023] [Accepted: 10/13/2023] [Indexed: 10/24/2023]
Abstract
Biological methane, a major source of global methane budget, is traditionally thought to be produced in anaerobic environments. However, the recent reports about methane supersaturation occurring in oxygenated water layer, termed as "methane paradox", have challenged this prevailing paradigm. Significantly, growing evidence has indicated that phytoplankton including prokaryotic cyanobacteria and eukaryotic algae are capable of generating methane under aerobic conditions. In this regard, a systematic review of aerobic methane production by phytoplankton is expected to arouse the public attention, contributing to the understanding of methane paradox. Here, we comprehensively summarize the widespread phenomena of methane supersaturation in oxic layers. The remarkable correlation relationships between methane concentration and several key indicators (depth, chlorophyll a level and organic sulfide concentration) indicate the significance of phytoplankton in in-situ methane accumulation. Subsequently, four mechanisms of aerobic methane production by phytoplankton are illustrated in detail, including photosynthesis-driven metabolism, reactive oxygen species (ROS)-driven demethylation of methyl donors, methanogenesis catalyzed by nitrogenase and demethylation of phosphonates catalyzed by CP lyase. The first two pathways occur in various phytoplankton, while the latter two have been specially discovered in cyanobacteria. Additionally, the effects of four crucial factors on aerobic methane production by phytoplankton are also discussed, including phytoplankton species, light, temperature and crucial nutrients. Finally, the measures to control global methane emissions from phytoplankton, the precise intracellular mechanisms of methane production and a more complete global methane budget model are definitely required in the future research on methane production by phytoplankton. This review would provide guidance for future studies of aerobic methane production by phytoplankton and emphasize the potential contribution of aquatic ecosystems to global methane budget.
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Affiliation(s)
- Yufeng Mao
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China; Key Laboratory of Hydraulic and Waterway Engineering, Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China; Lingzhi Environmental Protection Co., Ltd, Wuxi 214200, China
| | - Tong Lin
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Hong Li
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Ruixu He
- Key Laboratory of Hydraulic and Waterway Engineering, Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China
| | - Kailai Ye
- Key Laboratory of Hydraulic and Waterway Engineering, Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China
| | - Weiwei Yu
- Key Laboratory of Hydraulic and Waterway Engineering, Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China
| | - Qiang He
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China.
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Paul K, Gaikwad M, Choudhary P, Mohan N, Pai P, Patil SD, Pawar Y, Chawande A, Banerjee A, Nagle V, Chelliah M, Sapre A, Dasgupta S. Year-round sustainable biomass production potential of Nannochloris sp. in outdoor raceway pond enabled through strategic photobiological screening. PHOTOSYNTHESIS RESEARCH 2022; 154:303-328. [PMID: 36434418 DOI: 10.1007/s11120-022-00984-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Accepted: 11/04/2022] [Indexed: 06/16/2023]
Abstract
Microalgae cultivation utilizes the energy of sunlight to reduce carbon dioxide (CO2) for producing renewable energy feedstock. The commercial success of the biological fixation of carbon in a consistent manner depends upon the availability of a robust microalgae strain. In the present work, we report the identification of a novel marine Nannochloris sp. through multiparametric photosynthetic evaluation. Detailed photobiological analysis of this strain has revealed a smaller functional antenna, faster relaxation kinetics of non-photochemical quenching, and a high photosynthetic rate with increasing light and temperatures. Furthermore, laboratory scale growth assessment demonstrated a broad range halotolerance of 10-70 parts per thousand (PPT) and high-temperature tolerance up to 45 °C. Such traits led to the translation of biomass productivity potential from the laboratory scale (0.2-3.0 L) to the outdoor 50,000 L raceway pond scale (500-m2) without any pond crashes. The current investigation revealed outdoor single-day peak areal biomass productivity of 43 g m-2 d-1 in summer with an annual (March 2019-February 2020) average productivity of 20 g m-2 d-1 in seawater. From a sustainability perspective, this is the first report of successful round-the-year (> 347 days) multi-season (summer, monsoon, and winter) outdoor cultivation of Nannochloris sp. in broad seawater salinity (1-57 PPT), wide temperature ranges (15-40 °C), and in fluctuating light conditions. Concurrently, outdoor cultivation of this strain demonstrated conducive fatty acid distribution, including increased unsaturated fatty acids in winter. This inherent characteristic might play a role in protecting photosynthesis machinery at low temperatures and in high light stress. Altogether, our marine Nannochloris sp. showed tremendous potential for commercial scale cultivation to produce biofuels, food ingredients, and a sustainable source for vegetarian protein.
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Affiliation(s)
- Kenny Paul
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India
| | - Mahadev Gaikwad
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India
| | | | | | - Puja Pai
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India
| | - Smita D Patil
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India
| | - Yogesh Pawar
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India
| | - Akshay Chawande
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India
| | - Arun Banerjee
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India.
| | - Vinod Nagle
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India
| | | | - Ajit Sapre
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India
| | - Santanu Dasgupta
- Synthetic Biology Research and Development Group, Reliance Industries Limited, Reliance Corporate Park, Ghansoli, Thane- Belapur Road, Navi Mumbai, 400701, India
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5
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Torrado A, Connabeer HM, Röttig A, Pratt N, Baylay AJ, Terry MJ, Moore CM, Bibby TS. Directing cyanobacterial photosynthesis in a cytochrome c oxidase mutant using a heterologous electron sink. PLANT PHYSIOLOGY 2022; 189:2554-2566. [PMID: 35522034 PMCID: PMC9342982 DOI: 10.1093/plphys/kiac203] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 03/30/2022] [Indexed: 05/04/2023]
Abstract
Photosynthesis holds the promise of sustainable generation of useful products using light energy. Key to realizing this potential is the ability to rationally design photosynthesis to redirect energy and reductant derived from photons to desired products. Cytochrome P450s (P450s), which catalyze a broad array of reactions, have been engineered into a variety of photosynthetic organisms, where their activity has been shown to be photosynthesis-dependent, thus acting as heterologous sinks of electrons derived from photosynthesis. Furthermore, the addition of P450s can increase the photosynthetic capacity of the host organism. In this study, we developed this technology further using a P450 (CYP1A1) expressed in the cyanobacterium Synechococcus sp. PCC 7002. We show that rationally engineering photosynthesis by the removal of a competing electron sink, the respiratory terminal oxidase cytochrome c oxidase, increased the activity of CYP1A1. We provide evidence that this enhanced CYP1A1 activity was facilitated via an increase in the flux of electrons through Photosystem I. We also conducted a transcriptomic analysis on the designed strains to gain a more holistic understanding of how the cell responds to rational engineering. We describe a complex response including changes in expression of genes involved in photosynthesis and electron transfer linked to respiration. Specifically, the expression of CYP1A1 resulted in the reduction in expression of other natural electron dissipation pathways. This study emphasizes the potential for engineering photosynthetic organisms in biotechnology but also highlights the need to consider the broader impacts on cellular metabolism of any rationally induced changes.
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Affiliation(s)
| | | | - Annika Röttig
- Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton SO14 3ZH, UK
| | - Nicola Pratt
- Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton SO14 3ZH, UK
| | - Alison J Baylay
- Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton SO14 3ZH, UK
| | - Matthew J Terry
- School of Biological Sciences, University of Southampton, Southampton SO17 1BJ, UK
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - C Mark Moore
- Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton SO14 3ZH, UK
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
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6
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Yang L, Feng YX, Lin YJ, Yu XZ. Comparative effects of sodium hydrosulfide and proline on functional repair in rice chloroplast through the D1 protein and thioredoxin system under simulated thiocyanate pollution. CHEMOSPHERE 2021; 284:131389. [PMID: 34323803 DOI: 10.1016/j.chemosphere.2021.131389] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 06/21/2021] [Accepted: 06/28/2021] [Indexed: 05/21/2023]
Abstract
Various environmental contaminants can find their way to enter plant cells and disturb and/or damage the essential components of PSII repair cycle in chloroplast, thereby resulting in dysfunction of chloroplast. In the current research, a microcosm hydroponic experiment was set up to evaluate the comparative effects of sodium hydrosulfide (NaHS)- and proline (Pro)-mediated functional repairing of chloroplast in rice plants under SCN- stress. Our results displayed that when exposed to environmental realistic SCN- concentrations (24-300 mg L-1), foist significant (p < 0.05) gene-dose repercussion on the pathways of photosynthetic reactions and energy metabolism in rice shoots, and a downturn in the level of total soluble starch, sugar, and chlorophyll. Sodium hydrosulfide application effectively mitigated (p < 0.05) the toxic effects of SCN- in rice seedlings by stimulating the processes of phosphorylation, dephosphorylation and new-synthesis of D1 protein in the PSII repair cycle, and increased the turnover of D1 protein to recover CO2 assimilation. Evidently, Pro treatment mainly enhanced (p < 0.05) the expression of magnesium chelatase (MgCh) and ribulose-1,5-bisphosphate carboxylase (Rubisco) related genes under simulated SCN- stress, suggesting that the targeted repairing site in chloroplast by Pro was different from NaHS. The outcome of the present research contributes to a better understanding at molecular level for repairing of chloroplast functional disorder by NaHS and Pro at different key nodes under SCN- stress.
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Affiliation(s)
- Li Yang
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China
| | - Yu-Xi Feng
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China
| | - Yu-Juan Lin
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China
| | - Xiao-Zhang Yu
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China.
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7
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Zhang H, Zhao L, Chen Y, Zhu M, Xu Q, Wu M, Han D, Hu Q. Trophic Transition Enhanced Biomass and Lipid Production of the Unicellular Green Alga Scenedesmus acuminatus. Front Bioeng Biotechnol 2021; 9:638726. [PMID: 34095093 PMCID: PMC8176925 DOI: 10.3389/fbioe.2021.638726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 04/08/2021] [Indexed: 11/18/2022] Open
Abstract
Microalgal heterotrophic cultivation is an emerging technology that can enable producing high cell-density algal cell cultures, which can be coupled with photoautotrophic cultivation for valuable chemicals such as lipids manufacturing. However, how the heterotrophically grown algal cells respond to the lipid-inducing conditions has not been fully elucidated so far. In this study, when the heterotrophically grown Scenedesmus acuminatus cells were subjected to the high light (HL) and nitrogen-limited (NL) conditions, both the biomass and lipid productivity were enhanced as compared to that of the photoautotrophically grown counterparts. The chlorophyll a fluorometry analysis showed that the Fv/Fm and Y(II) of the heterotrophically grown cells subjected to the HL and NL conditions was recovered to the maximum value of 0.75 and 0.43, respectively, much higher than those of the photoautotrophically grown cells under the same stress conditions. Transcriptomic analysis revealed that heterotrophically grown cells fully expressed the genes coding for the photosystems proteins, including the key photoprotective proteins D1, PsbS, light-harvesting-complex (LHC) I and LHC II. Meanwhile, downregulation of the carotenoid biosynthesis and upregulation of the glycolysis/gluconeogenesis, tricarboxylic acid (TCA) cycle and oxidative phosphorylation pathways were observed when the heterotrophically grown cells were subjected to the HL and N-limited conditions for lipid production. It was deduced that regulation of these pathways not only enhanced the light utilization but also provided the reducing power and ATP by which the biomass accumulation was significantly elevated. Besides, upregulation of the acetyl-CoA carboxylase/biotin carboxylase, digalactosyl diacylglycerol synthase and diacylglycerol acyltransferase 2 encoding genes may be attributable to the enhanced lipid production. Understanding the cellular responses during the trophic transition process could guide improvement of the strength of trophic transition enhancing microalgal biomass and lipid production.
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Affiliation(s)
- Hu Zhang
- Center for Microalgal Biotechnology and Biofuels, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Liang Zhao
- Center for Microalgal Biotechnology and Biofuels, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Yi Chen
- Center for Microalgal Biotechnology and Biofuels, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Mianmian Zhu
- Center for Microalgal Biotechnology and Biofuels, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Quan Xu
- Center for Microalgal Biotechnology and Biofuels, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Mingcan Wu
- Center for Microalgal Biotechnology and Biofuels, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Danxiang Han
- Center for Microalgal Biotechnology and Biofuels, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.,Key Laboratory for Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.,The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China
| | - Qiang Hu
- Center for Microalgal Biotechnology and Biofuels, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.,Key Laboratory for Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.,Institute for Advanced Study, Shenzhen University, Shenzhen, China.,State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
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8
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Noyma NP, Mesquita MCB, Roland F, Marinho MM, Huszar VLM, Lürling M. Increasing Temperature Counteracts the Negative Effect of UV Radiation on Growth and Photosynthetic Efficiency of Microcystis aeruginosa and Raphidiopsis raciborskii. Photochem Photobiol 2021; 97:753-762. [PMID: 33394510 DOI: 10.1111/php.13377] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 12/29/2020] [Indexed: 11/29/2022]
Abstract
High temperature can promote cyanobacterial blooms, whereas ultraviolet radiation (UVR) can potentially depress cyanobacterial growth by damaging their photosynthetic apparatus. Although the damaging effect of UVR has been well documented, reports on the interactive effects of UV radiation exposure and warming on cyanobacteria remain scarce. To better understand the combined effects of temperature and UVR on cyanobacteria, two strains of nuisance species, Microcystis aeruginosa (MIRF) and Raphidiopsis raciborskii (formerly Cylindrospermopsis raciborskii, CYRF), were grown at 24°C and 28°C and were daily exposed to UVA + UVB (PAR + UVA+UVB) or only UVA (PAR + UVA) radiation. MIRF and CYRF growth rates were most affected by PAR + UVA+UVB treatment and to a lesser extent by the PAR + UVA treatment. Negative UVR effects on growth, Photosystem II (PSII) efficiency and photosynthesis were pronounced at 24°C when compared to that at 28°C. Our results showed a cumulative negative effect on PSII efficiency in MIRF, but not in CYRF. Hence, although higher temperature ameliorates UVR damage, interspecific differences may lead to deviating impacts on different species, and combined elevated temperature and UVR stress could influence species competition.
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Affiliation(s)
- Natália Pessoa Noyma
- Laboratory of Ecology and Physiology of Phytoplankton, Department of Plant Biology, University of Rio de Janeiro State, Rio de Janeiro, RJ, Brazil
| | - Marcella C B Mesquita
- Laboratory of Ecology and Physiology of Phytoplankton, Department of Plant Biology, University of Rio de Janeiro State, Rio de Janeiro, RJ, Brazil
| | - Fábio Roland
- Laboratory of Aquatic Ecology, Department of Biology, Federal University of Juiz de Fora, Juiz de Fora, MG, Brazil
| | - Marcelo Manzi Marinho
- Laboratory of Ecology and Physiology of Phytoplankton, Department of Plant Biology, University of Rio de Janeiro State, Rio de Janeiro, RJ, Brazil
| | - Vera L M Huszar
- Museu Nacional, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Miquel Lürling
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, Wageningen, The Netherlands
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9
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Resilience and self-regulation processes of microalgae under UV radiation stress. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C: PHOTOCHEMISTRY REVIEWS 2020. [DOI: 10.1016/j.jphotochemrev.2019.100322] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Huang S, Zuo T, Ni W. Important roles of glycinebetaine in stabilizing the structure and function of the photosystem II complex under abiotic stresses. PLANTA 2020; 251:36. [PMID: 31903497 DOI: 10.1007/s00425-019-03330-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Accepted: 12/14/2019] [Indexed: 05/08/2023]
Abstract
The molecular and physiological mechanisms of glycinebetaine stabilizing photosystem II complex under abiotic stresses are discussed, helping to address food shortage problems threatening the survival of growing population. In the backdrop of climate change, the frequency, dimensions and duration of extreme events have increased sharply, which may have unintended consequences for agricultural. The acclimation of plants to a constantly changing environment involves the accumulation of compatible solutes. Various compatible solutes enable plants to tolerate abiotic stresses, and glycinebetaine (GB) is one of the most-studied. The biosynthesis and accumulation of GB appear in numerous plant species, especially under environmental stresses. The exogenous application of GB and GB-accumulating transgenic plants have been proven to further promote plant development under stresses. Early research on GB focused on the maintenance of osmotic potential in plants. Subsequent experimental evidence demonstrated that it also protects proteins including the photosystem II complex (PSII) from denaturation and deactivation. As reviewed here, multiple experimental evidences have indicated considerable progress in the roles of GB in stabilizing PSII under abiotic stresses. Based on these advances, we've concluded two effects of GB on PSII: (1) it stabilizes the structure of PSII by protecting extrinsic proteins from dissociation or by promoting protein synthesize; (2) it enhances the oxygen-evolving activity of PSII or promotes the repair of the photosynthetic damage of PSII.
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Affiliation(s)
- Shan Huang
- College of Environmental and Resource Sciences, Zhejiang University, Key Laboratory of Agricultural Resource and Environment of Zhejiang Province, Hangzhou, 310058, China
| | - Ting Zuo
- College of Environmental and Resource Sciences, Zhejiang University, Key Laboratory of Agricultural Resource and Environment of Zhejiang Province, Hangzhou, 310058, China
| | - Wuzhong Ni
- College of Environmental and Resource Sciences, Zhejiang University, Key Laboratory of Agricultural Resource and Environment of Zhejiang Province, Hangzhou, 310058, China.
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Chen Z, Jiang H, Gao K, Qiu B. Acclimation to low ultraviolet‐B radiation increases photosystem I abundance and cyclic electron transfer with enhanced photosynthesis and growth in the cyanobacterium
Nostoc sphaeroides. Environ Microbiol 2019; 22:183-197. [DOI: 10.1111/1462-2920.14836] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 10/18/2019] [Indexed: 01/24/2023]
Affiliation(s)
- Zhen Chen
- School of Life Sciences, Hubei Key Laboratory of Genetic Regulation and Integrative BiologyCentral China Normal University Wuhan Hubei 430079 People's Republic of China
| | - Hai‐Bo Jiang
- School of Life Sciences, Hubei Key Laboratory of Genetic Regulation and Integrative BiologyCentral China Normal University Wuhan Hubei 430079 People's Republic of China
| | - Kunshan Gao
- State Key Laboratory of Marine Environmental ScienceXiamen University Xiamen Fujian 361005 People's Republic of China
| | - Bao‐Sheng Qiu
- School of Life Sciences, Hubei Key Laboratory of Genetic Regulation and Integrative BiologyCentral China Normal University Wuhan Hubei 430079 People's Republic of China
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Phukan T, Rai AN, Syiem MB. Unstandardized UV-C dose used for killing harmful cyanobacteria may instead initiate accelerated growth in the target organisms. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 181:274-283. [PMID: 31201959 DOI: 10.1016/j.ecoenv.2019.05.074] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 04/26/2019] [Accepted: 05/25/2019] [Indexed: 06/09/2023]
Abstract
Although UV-C radiation has been in use for killing unwanted cyanobacteria, experiments with lower doses of UV-C radiation instead showed induction of growth related parameters and enhanced biomass production in the cyanobacterium Nostoc muscorum Meg1. When the cyanobacterial cultures were exposed to UV-C radiation of varying doses (6, 12 and 18 mJ/cm2), concentrations of various photo-absorbing pigments, RuBisCO and D1 protein of PSII; activities of oxygen evolving complex, nitrogenase and glutamine synthetase were significantly increased upon 6 and 12 mJ/cm2 UV-C radiation exposures. Resulting higher photosynthetic performance was evident from the augmentation in carbohydrate content by ∼49% under single exposure to 6 mJ/cm2 UV-C by fifteenth day. The increased performances of both RuBisCO and D1 proteins were in part also due to induction at the genetic level as seen from the increase in their mRNA and protein levels under treatment. Similar increase was also observed in protein (16%) and in lipid contents (43%) that reflected an upsurge in the total biomass. Highest biomass (463 mg/L/d) was noted in culture exposed to 6 mJ/cm2 UV-C radiation, representing a ∼25% increase. Furthermore the possibility of this organism using part of the incident UV-C radiation as an additional source of energy was deduced from an experiment where the thylakoid membranes excited within UV (226-400 nm) range showed emission at longer wavelengths with an emission maximum at ∼640 nm. Thus this work provides evidence that lower UV-C doses can potentially augment cyanobacterial growth and use of unstandardized UV-C doses for restricting cyanobacterial growth may in fact produce contrary result.
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Affiliation(s)
- Tridip Phukan
- Department of Biochemistry, North Eastern Hill University, Shillong, 793022, Meghalaya, India
| | - Amar Nath Rai
- Department of Biochemistry, North Eastern Hill University, Shillong, 793022, Meghalaya, India
| | - Mayashree B Syiem
- Department of Biochemistry, North Eastern Hill University, Shillong, 793022, Meghalaya, India.
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Wang B, Wang X, Hu Y, Chang M, Bi Y, Hu Z. The combined effects of UV-C radiation and H2O2 on Microcystis aeruginosa, a bloom-forming cyanobacterium. CHEMOSPHERE 2015; 141:34-43. [PMID: 26092198 DOI: 10.1016/j.chemosphere.2015.06.020] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Revised: 05/04/2015] [Accepted: 06/08/2015] [Indexed: 06/04/2023]
Abstract
In order to get insight into the impacts of UVC/H2O2 on Microcystis aeruginosa, physiological and morphological changes as well as toxicity were detected under different UVC/H2O2 treatments. In the presence of sole UVC or H2O2, the net oxygen evolution rate decreased significantly (p<0.05) since activity of photosystem II (PSII) was inhibited. Meanwhile, increase of intracellular reactive oxygen species (ROS), degradation of microcystin (MC) and ultrastructure destructions were observed. Under sole UVC treatment, no changes happened in the activity of photosystem I (PSI), but the degradation of D1 protein was observed. Under sole H2O2 treatment, an increase of malondialdehyde, aggregation of D1 protein and deformation of the thylakoid membrane were observed. ROS content under H2O2 treatment was about 5 times than that under UVC treatment. Combined use of UVC and H2O2, as well as 20mJcm(-2) UVC and 60μM H2O2, showed high synergetic effects. Obvious damage to membrane systems, the marked degradation of MC and inhibition of the photosystems were observed. It could be deduced that UVC worked on intracellular membrane components directly and the damaged oxygen-evolving complex, which was followed by the D1 protein degradation. H2O2 oxidised the membrane lipids via an ROS-mediated process, with thylakoid injury and the aggregation of D1 protein being the lethal mechanisms, and both PSII and PSI being the attacking targets. With regard towards the effective inactivation of M. aeruginosa and high removal of MC, UVC/H2O2 proposed a novel practical method in controlling cyanobacterial blooms.
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Affiliation(s)
- Binliang Wang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xi Wang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yiwei Hu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Mingxian Chang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Yonghong Bi
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
| | - Zhengyu Hu
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
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Rastogi RP, Sinha RP, Moh SH, Lee TK, Kottuparambil S, Kim YJ, Rhee JS, Choi EM, Brown MT, Häder DP, Han T. Ultraviolet radiation and cyanobacteria. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 141:154-69. [DOI: 10.1016/j.jphotobiol.2014.09.020] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 09/22/2014] [Accepted: 09/25/2014] [Indexed: 12/13/2022]
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