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Zhang H, Xiong X, Guo K, Zheng M, Cao T, Yang Y, Song J, Cen J, Zhang J, Jiang Y, Feng S, Tian L, Li X. A rapid aureochrome opto-switch enables diatom acclimation to dynamic light. Nat Commun 2024; 15:5578. [PMID: 38956103 PMCID: PMC11219949 DOI: 10.1038/s41467-024-49991-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 06/27/2024] [Indexed: 07/04/2024] Open
Abstract
Diatoms often outnumber other eukaryotic algae in the oceans, especially in coastal environments characterized by frequent fluctuations in light intensity. The identities and operational mechanisms of regulatory factors governing diatom acclimation to high light stress remain largely elusive. Here, we identified the AUREO1c protein from the coastal diatom Phaeodactylum tricornutum as a crucial regulator of non-photochemical quenching (NPQ), a photoprotective mechanism that dissipates excess energy as heat. AUREO1c detects light stress using a light-oxygen-voltage (LOV) domain and directly activates the expression of target genes, including LI818 genes that encode NPQ effector proteins, via its bZIP DNA-binding domain. In comparison to a kinase-mediated pathway reported in the freshwater green alga Chlamydomonas reinhardtii, the AUREO1c pathway exhibits a faster response and enables accumulation of LI818 transcript and protein levels to comparable degrees between continuous high-light and fluctuating-light treatments. We propose that the AUREO1c-LI818 pathway contributes to the resilience of diatoms under dynamic light conditions.
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Affiliation(s)
- Huan Zhang
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
- Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, China
| | - Xiaofeng Xiong
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
| | - Kangning Guo
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
| | - Mengyuan Zheng
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
- China National Botanical Garden, Beijing, China
| | - Tianjun Cao
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
- Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, China
| | - Yuqing Yang
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
| | - Jiaojiao Song
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
| | - Jie Cen
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
| | - Jiahuan Zhang
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
| | - Yanyou Jiang
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
| | - Shan Feng
- Mass Spectrometry & Metabolomics Core Facility, The Biomedical Research Core Facility, Center for Research Equipment and Facilities, Westlake University, Hangzhou, China
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China
| | - Lijin Tian
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
- China National Botanical Garden, Beijing, China
| | - Xiaobo Li
- Research Center for Industries of the Future, Key Laboratory of Growth Regulation and Translational Research of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, China.
- Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, China.
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Volpe C, Nymark M, Andersen T, Winge P, Lavaud J, Vadstein O. Skeletonema marinoi ecotypes show specific habitat-related responses to fluctuating light supporting high potential for growth under photobioreactor light regime. THE NEW PHYTOLOGIST 2024; 243:145-161. [PMID: 38736026 DOI: 10.1111/nph.19788] [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: 03/01/2024] [Accepted: 04/09/2024] [Indexed: 05/14/2024]
Abstract
Diatoms are a diverse group of phytoplankton usually dominating areas characterized by rapidly shifting light conditions. Because of their high growth rates and interesting biochemical profile, their biomass is considered for various commercial applications. This study aimed at identifying strains with superior growth in a photobioreactor (PBR) by screening the natural intraspecific diversity of ecotypes isolated from different habitats. We investigated the effect of PBR light fluctuating on a millisecond scale (FL, simulating the light in a PBR) on 19 ecotypes of the diatom Skeletonema marinoi isolated from the North Sea-Baltic Sea area. We compare growth, pigment ratios, phylogeny, photo-physiological variables and photoacclimation strategies between all strains and perform qPCR and absorption spectra analysis on a subset of strains. Our results show that the ecotypes responded differently to FL, and have contrasting photo-physiological and photoprotective strategies. The strains from Kattegat performed better in FL, and shared common photoacclimation and photoprotection strategies that are the results of adaptation to the specific light climate of the Kattegat area. The strains that performed better with FL conditions had a high light (HL)-acclimated phenotype coupled with unique nonphotochemical quenching features. Based on their characteristics, three strains were identified as good candidates for growth in PBRs.
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Affiliation(s)
- Charlotte Volpe
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
- Department of Fisheries and New Biomarine Industry, SINTEF Ocean, N-7465, Trondheim, Norway
| | - Marianne Nymark
- Department of Fisheries and New Biomarine Industry, SINTEF Ocean, N-7465, Trondheim, Norway
- Department of Biology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
| | - Tom Andersen
- Department of Biosciences, Section for Aquatic Biology and Toxicology (AQUA), University of Oslo, N-0316, Oslo, Norway
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
| | - Johann Lavaud
- LEMAR-Laboratory of Marine Environmental Sciences, UMR6539 CNRS, Univ Brest, Ifremer, IRD, Institut Européen de la Mer, Technopôle Brest-Iroise, rue Dumont d'Urville, Plouzané, 29280, France
| | - Olav Vadstein
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
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Svenning JB, Vasskog T, Campbell K, Bæverud AH, Myhre TN, Dalheim L, Forgereau ZL, Osanen JE, Hansen EH, Bernstein HC. Lipidome Plasticity Enables Unusual Photosynthetic Flexibility in Arctic vs. Temperate Diatoms. Mar Drugs 2024; 22:67. [PMID: 38393038 PMCID: PMC10890139 DOI: 10.3390/md22020067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 01/23/2024] [Accepted: 01/24/2024] [Indexed: 02/25/2024] Open
Abstract
The diatom lipidome actively regulates photosynthesis and displays a high degree of plasticity in response to a light environment, either directly as structural modifications of thylakoid membranes and protein-pigment complexes, or indirectly via photoprotection mechanisms that dissipate excess light energy. This acclimation is crucial to maintaining primary production in marine systems, particularly in polar environments, due to the large temporal variations in both the intensity and wavelength distributions of downwelling solar irradiance. This study investigated the hypothesis that Arctic marine diatoms uniquely modify their lipidome, including their concentration and type of pigments, in response to wavelength-specific light quality in their environment. We postulate that Arctic-adapted diatoms can adapt to regulate their lipidome to maintain growth in response to the extreme variability in photosynthetically active radiation. This was tested by comparing the untargeted lipidomic profiles, pigmentation, specific growth rates and carbon assimilation of the Arctic diatom Porosira glacialis vs. the temperate species Coscinodiscus radiatus during exponential growth under red, blue and white light. Here, we found that the chromatic wavelength influenced lipidome remodeling and growth in each strain, with P. glacialis showing effective utilization of red light coupled with increased inclusion of primary light-harvesting pigments and polar lipid classes. These results indicate a unique photoadaptation strategy that enables Arctic diatoms like P. glacialis to capitalize on a wide chromatic growth range and demonstrates the importance of active lipid regulation in the Arctic light environment.
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Affiliation(s)
- Jon Brage Svenning
- Norwegian College of Fishery Science, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (L.D.); (E.H.H.); (H.C.B.)
- SINTEF Nord, Storgata 118, 9008 Tromsø, Norway
| | - Terje Vasskog
- Department of Pharmacy, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (T.V.); (A.H.B.); (T.N.M.)
| | - Karley Campbell
- Department of Arctic and Marine Biology, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (K.C.); (Z.L.F.); (J.E.O.)
| | - Agnethe Hansen Bæverud
- Department of Pharmacy, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (T.V.); (A.H.B.); (T.N.M.)
| | - Torbjørn Norberg Myhre
- Department of Pharmacy, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (T.V.); (A.H.B.); (T.N.M.)
| | - Lars Dalheim
- Norwegian College of Fishery Science, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (L.D.); (E.H.H.); (H.C.B.)
| | - Zoé Lulu Forgereau
- Department of Arctic and Marine Biology, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (K.C.); (Z.L.F.); (J.E.O.)
| | - Janina Emilia Osanen
- Department of Arctic and Marine Biology, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (K.C.); (Z.L.F.); (J.E.O.)
| | - Espen Holst Hansen
- Norwegian College of Fishery Science, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (L.D.); (E.H.H.); (H.C.B.)
| | - Hans C. Bernstein
- Norwegian College of Fishery Science, UiT—The Arctic University of Norway, 9037 Tromsø, Norway; (L.D.); (E.H.H.); (H.C.B.)
- The Arctic Centre for Sustainable Energy—ARC, UiT—The Arctic University of Norway, 9037 Tromsø, Norway
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Sands E, Davies S, Puxty RJ, Vergé V, Bouget FY, Scanlan DJ, Carré IA. Genetic and physiological responses to light quality in a deep ocean ecotype of Ostreococcus, an ecologically important photosynthetic picoeukaryote. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:6773-6789. [PMID: 37658791 PMCID: PMC10662239 DOI: 10.1093/jxb/erad347] [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: 03/27/2023] [Accepted: 08/31/2023] [Indexed: 09/05/2023]
Abstract
Phytoplankton are exposed to dramatic variations in light quality when cells are carried by upwelling or downwelling currents or encounter sediment. We investigated the potential impact of light quality changes in Ostreococcus, a key marine photosynthetic picoeukaryote, by analysing changes in its transcriptome, pigment content, and photophysiology after acclimation to monochromatic red, green, or blue light. The clade B species RCC809, isolated from the deep euphotic zone of the tropical Atlantic Ocean, responded to blue light by accelerating cell division at the expense of storage reserves and by increasing the relative level of blue-light-absorbing pigments. It responded to red and green light by increasing its potential for photoprotection. In contrast, the clade A species OTTH0595, which originated from a shallow water environment, showed no difference in photosynthetic properties and minor differences in carotenoid contents between light qualities. This was associated with the loss of candidate light-quality responsive promoter motifs identified in RCC809 genes. These results demonstrate that light quality can have a major influence on the physiology of eukaryotic phytoplankton and suggest that different light quality environments can drive selection for diverse patterns of responsiveness and environmental niche partitioning.
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Affiliation(s)
- Elizabeth Sands
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
| | - Sian Davies
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
| | | | - Valerie Vergé
- Université Pierre et Marie Curie, Paris 06, UMR 7621, Laboratoire d’Océanographie Microbienne, Observatoire Océanologique, Banyuls sur Mer, France
| | - François-Yves Bouget
- Université Pierre et Marie Curie, Paris 06, UMR 7621, Laboratoire d’Océanographie Microbienne, Observatoire Océanologique, Banyuls sur Mer, France
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5
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Summers N, Fragoso GM, Johnsen G. Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night. Sci Rep 2023; 13:17971. [PMID: 37863949 PMCID: PMC10589289 DOI: 10.1038/s41598-023-44026-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 10/03/2023] [Indexed: 10/22/2023] Open
Abstract
Arctic macroalgae species have developed different growth strategies to survive extreme seasonal changes in irradiance in polar regions. We compared photophysiological parameters such as the light saturation parameter (Ek) and pigment composition of green, red, and brown macroalgae collected in January (Polar Night) and October 2020 (end of the light season). Macroalgae in January appeared healthier (morphologically) and had longer lamina (new growth) than those in October. EK values for red, and brown algae were higher with lower maximum quantum yield of PS II fluorescence (Fv/Fm) in January versus October. Furthermore, in January, new tissues in kelp species had higher EK than the older tissue. Higher EK and lower Fv/Fm during the Polar Night indicates that the photosynthetic apparatus is active but slow. Furthermore, we discuss Chlorophyll (Chl) a emission spectra under blue and green excitation light to determine the ratio of Chl a in photosystem II (PS II) vs photosystem I (PS I). Absorbance spectra of P. palmata was used to interpret the emission spectra. The observed spectral shifts in the absorbance and reflectance spectra of different macroalgae is discussed. Photophysiological methods provide health information complementary to future mapping and monitoring of macroalgae. These results reveal that macroalgae grow new tissue in darkness.
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Affiliation(s)
- Natalie Summers
- Centre for Autonomous Marine Operations and Systems (AMOS), Trondheim Biological Station, Department of Biology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.
| | - Glaucia M Fragoso
- Centre for Autonomous Marine Operations and Systems (AMOS), Trondheim Biological Station, Department of Biology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
| | - Geir Johnsen
- Centre for Autonomous Marine Operations and Systems (AMOS), Trondheim Biological Station, Department of Biology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
- University Centre in Svalbard (UNIS), Longyearbyen, Norway
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6
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Grant S, Johnsen G, McKee D, Zolich A, Cohen JH. Spectral and RGB analysis of the light climate and its ecological impacts using an all-sky camera system in the Arctic. APPLIED OPTICS 2023; 62:5139-5150. [PMID: 37707217 DOI: 10.1364/ao.480454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 03/22/2023] [Indexed: 09/15/2023]
Abstract
The ArcLight observatory provides an hourly continuous time series of all-sky images providing light climate data (intensity, spectral composition, and photoperiod) from the Arctic (Svalbard at 79°N). Until recently, no complete annual time series of light climate relevant for biological processes has been provided from the high Arctic because of insufficient sensitivity of commercial light sensors during the Polar Night. The ArcLight set up is unique, as it provides both all-sky images and the corresponding integrated spectral irradiance in the visible part of the solar electromagnetic spectrum (E P A R ). Here we present a further development providing hourly diel-annual dynamics from 2020 of the irradiance partitioned into the red, green, and blue parts of the solar spectrum and illustrate their relation to weather conditions, and sun and moon trajectories. We show that there is variation between the RGB proportions of irradiance throughout the year, with the blue part of the spectrum showing the greatest variation, which is dependent on weather conditions (i.e., cloud cover). We further provide an example of the biological impact of these spectral variations in the light climate using in vivo Chl a-specific absorption coefficients of diatoms (mean of six low light acclimated northern-Arctic bloom-forming species) to model total algal light absorption (AQ t o t a l ) and the corresponding fraction of quanta used by Photosystem II (AQPSII) (O 2 production) in RGB bands and the potential impacts on the photoreceptor response, suggesting periods where repair and maintenance functions dominate activity in the absence of appreciable levels of red or green light. The method used here can be applied to light climate data and spectral response data worldwide to give localized ecological models of AQ.
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7
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Zhang Z, Han T, Sui J, Wang H. Cryptochrome-mediated blue-light signal contributes to carotenoids biosynthesis in microalgae. Front Microbiol 2022; 13:1083387. [PMID: 36620041 PMCID: PMC9813510 DOI: 10.3389/fmicb.2022.1083387] [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: 10/29/2022] [Accepted: 11/28/2022] [Indexed: 12/24/2022] Open
Abstract
Microalgae are considered as ideal cell factories for producing natural carotenoids which display favorable biological activities. As the most important abiotic factor, light not only provides energy for photosynthetic metabolism, but also regulates numerous biological processes. Blue light is the main wavelength of light that can travel through water. Previous studies have shown that blue light triggered carotenoid accumulation in several microalgae species, but the molecular mechanism remains unclear. Cryptochromes were blue-light-absorbing photoreceptors that have been found in all studied algal genomes. In this study, several different types of cryptochrome genes were cloned from Haematococcus pluvialis and Phaeodactylum tricornutum. Among them, cryptochrome genes HpCRY4 from H. pluvialis and PtCPF1 from P. tricornutum were upregulated under blue light treatment, in correlation with the increase of astaxanthin and fucoxanthin contents. Besides, heterologous expression and gene knockout was performed to verify the function of HpCRY4 and PtCPF1 in regulating carotenoid biosynthesis in microalgae. These results indicate that carotenoid biosynthesis in microalgae promoted by blue light was mediated by cryptochromes as photoreceptors.
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Affiliation(s)
- Zhongyi Zhang
- Solar Energy Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences (CAS), Qingdao, China
| | - Tianli Han
- Solar Energy Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences (CAS), Qingdao, China
| | - Jikang Sui
- Solar Energy Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences (CAS), Qingdao, China
| | - Hui Wang
- Solar Energy Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences (CAS), Qingdao, China,Shandong Energy Research Institute, Qingdao, China,*Correspondence: Hui Wang,
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8
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Liu S, Storti M, Finazzi G, Bowler C, Dorrell RG. A metabolic, phylogenomic and environmental atlas of diatom plastid transporters from the model species Phaeodactylum. FRONTIERS IN PLANT SCIENCE 2022; 13:950467. [PMID: 36212359 PMCID: PMC9546453 DOI: 10.3389/fpls.2022.950467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Accepted: 09/02/2022] [Indexed: 06/16/2023]
Abstract
Diatoms are an important group of algae, contributing nearly 40% of total marine photosynthetic activity. However, the specific molecular agents and transporters underpinning the metabolic efficiency of the diatom plastid remain to be revealed. We performed in silico analyses of 70 predicted plastid transporters identified by genome-wide searches of Phaeodactylum tricornutum. We considered similarity with Arabidopsis thaliana plastid transporters, transcriptional co-regulation with genes encoding core plastid metabolic pathways and with genes encoded in the mitochondrial genomes, inferred evolutionary histories using single-gene phylogeny, and environmental expression trends using Tara Oceans meta-transcriptomics and meta-genomes data. Our data reveal diatoms conserve some of the ion, nucleotide and sugar plastid transporters associated with plants, such as non-specific triose phosphate transporters implicated in the transport of phosphorylated sugars, NTP/NDP and cation exchange transporters. However, our data also highlight the presence of diatom-specific transporter functions, such as carbon and amino acid transporters implicated in intricate plastid-mitochondria crosstalk events. These confirm previous observations that substrate non-specific triose phosphate transporters (TPT) may exist as principal transporters of phosphorylated sugars into and out of the diatom plastid, alongside suggesting probable agents of NTP exchange. Carbon and amino acid transport may be related to intricate metabolic plastid-mitochondria crosstalk. We additionally provide evidence from environmental meta-transcriptomic/meta- genomic data that plastid transporters may underpin diatom sensitivity to ocean warming, and identify a diatom plastid transporter (J43171) whose expression may be positively correlated with temperature.
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Affiliation(s)
- Shun Liu
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, Centre National De La Recherche Scientifique (CNRS), Institut National De La Santé Et De La Recherche Médicale (INSERM), Université Paris Sciences et Lettres (PSL), Paris, France
- CNRS Research Federation for the study of Global Ocean Systems Ecology and Evolution, FR2022/Tara Oceans GOSEE, 3 rue Michel-Ange, Paris, France
| | - Mattia Storti
- Univ. Grenoble Alpes (UGA), Centre National Recherche Scientifique (CNRS), Commissariat Energie Atomique Energies Alternatives (CEA), Institut National Recherche Agriculture Alimentation Environnement (INRAE), Interdisciplinary Research Institute of Grenoble (IRIG), Laboratoire de Physiologie Cellulaire et Végétale (LPCV), Grenoble, France
| | - Giovanni Finazzi
- Univ. Grenoble Alpes (UGA), Centre National Recherche Scientifique (CNRS), Commissariat Energie Atomique Energies Alternatives (CEA), Institut National Recherche Agriculture Alimentation Environnement (INRAE), Interdisciplinary Research Institute of Grenoble (IRIG), Laboratoire de Physiologie Cellulaire et Végétale (LPCV), Grenoble, France
| | - Chris Bowler
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, Centre National De La Recherche Scientifique (CNRS), Institut National De La Santé Et De La Recherche Médicale (INSERM), Université Paris Sciences et Lettres (PSL), Paris, France
- CNRS Research Federation for the study of Global Ocean Systems Ecology and Evolution, FR2022/Tara Oceans GOSEE, 3 rue Michel-Ange, Paris, France
| | - Richard G. Dorrell
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, Centre National De La Recherche Scientifique (CNRS), Institut National De La Santé Et De La Recherche Médicale (INSERM), Université Paris Sciences et Lettres (PSL), Paris, France
- CNRS Research Federation for the study of Global Ocean Systems Ecology and Evolution, FR2022/Tara Oceans GOSEE, 3 rue Michel-Ange, Paris, France
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9
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Potential for the Production of Carotenoids of Interest in the Polar Diatom Fragilariopsis cylindrus. Mar Drugs 2022; 20:md20080491. [PMID: 36005496 PMCID: PMC9409807 DOI: 10.3390/md20080491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 07/15/2022] [Accepted: 07/27/2022] [Indexed: 01/25/2023] Open
Abstract
Carotenoid xanthophyll pigments are receiving growing interest in various industrial fields due to their broad and diverse bioactive and health beneficial properties. Fucoxanthin (Fx) and the inter-convertible couple diadinoxanthin–diatoxanthin (Ddx+Dtx) are acknowledged as some of the most promising xanthophylls; they are mainly synthesized by diatoms (Bacillariophyta). While temperate strains of diatoms have been widely investigated, recent years showed a growing interest in using polar strains, which are better adapted to the natural growth conditions of Nordic countries. The aim of the present study was to explore the potential of the polar diatom Fragilariopsis cylindrus in producing Fx and Ddx+Dtx by means of the manipulation of the growth light climate (daylength, light intensity and spectrum) and temperature. We further compared its best capacity to the strongest xanthophyll production levels reported for temperate counterparts grown under comparable conditions. In our hands, the best growing conditions for F. cylindrus were a semi-continuous growth at 7 °C and under a 12 h light:12 h dark photoperiod of monochromatic blue light (445 nm) at a PUR of 11.7 μmol photons m−2 s−1. This allowed the highest Fx productivity of 43.80 µg L−1 day−1 and the highest Fx yield of 7.53 µg Wh−1, more than two times higher than under ‘white’ light. For Ddx+Dtx, the highest productivity (4.55 µg L−1 day−1) was reached under the same conditions of ‘white light’ and at 0 °C. Our results show that F. cylindrus, and potentially other polar diatom strains, are very well suited for Fx and Ddx+Dtx production under conditions of low temperature and light intensity, reaching similar productivity levels as model temperate counterparts such as Phaeodactylum tricornutum. The present work supports the possibility of using polar diatoms as an efficient cold and low light-adapted bioresource for xanthophyll pigments, especially usable in Nordic countries.
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10
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Zhang B, Sun D, Zhang X, Sun X, Xu N. Transcriptomics and metabolomics reveal the adaptive mechanisms of Gracilariopsis lemaneiformis in response to blue light. ALGAL RES 2022. [DOI: 10.1016/j.algal.2022.102760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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11
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Iwasaki K, Szabó M, Tamburic B, Evenhuis C, Zavafer A, Kuzhiumparambil U, Ralph P. Investigating the impact of light quality on macromolecular composition of Chaetoceros muelleri. FUNCTIONAL PLANT BIOLOGY : FPB 2022; 49:554-564. [PMID: 34635201 DOI: 10.1071/fp21131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 09/02/2021] [Indexed: 06/13/2023]
Abstract
Diatoms (Bacillariophyceae) are important to primary productivity of aquatic ecosystems. This algal group is also a valuable source of high value compounds that are utilised as aquaculture feed. The productivity of diatoms is strongly driven by light and CO2 availability, and macro- and micronutrient concentrations. The light dependency of biomass productivity and metabolite composition is well researched in diatoms, but information on the impact of light quality, particularly the productivity return on energy invested when using different monochromatic light sources, remains scarce. In this work, the productivity return on energy invested of improving growth rate, photosynthetic activity, and metabolite productivity of the diatom Chaetoceros muelleri under defined wavelengths (blue, red, and green) as well as while light is analysed. By adjusting the different light qualities to equal photosynthetically utilisable radiation, it was found that the growth rate and photosynthetic oxygen evolution was unchanged under white, blue, and green light, but it was lower under red light. Blue light improved the productivity return on energy invested for biomass, total protein, total lipid, total carbohydrate, and in fatty acids production, which would suggest that blue light should be used for aquaculture feed production.
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Affiliation(s)
- Kenji Iwasaki
- Climate Change Cluster (C3), Faculty of Science, University of Technology Sydney, NSW, Australia
| | - Milán Szabó
- Climate Change Cluster (C3), Faculty of Science, University of Technology Sydney, NSW, Australia; and Institute of Plant Biology, Biological Research Centre, Hungary, Eötvös Loránd Research Network (ELKH), Szeged, Hungary
| | - Bojan Tamburic
- Water Research Centre, School of Civil and Environmental Engineering, UNSW, Sydney, NSW, Australia
| | - Christian Evenhuis
- Climate Change Cluster (C3), Faculty of Science, University of Technology Sydney, NSW, Australia
| | - Alonso Zavafer
- Climate Change Cluster (C3), Faculty of Science, University of Technology Sydney, NSW, Australia; and Research School of Biology, Australian National University, Canberra, ACT, Australia
| | | | - Peter Ralph
- Climate Change Cluster (C3), Faculty of Science, University of Technology Sydney, NSW, Australia
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12
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Scarsini M, Thiriet-Rupert S, Veidl B, Mondeguer F, Hu H, Marchand J, Schoefs B. The Transition Toward Nitrogen Deprivation in Diatoms Requires Chloroplast Stand-By and Deep Metabolic Reshuffling. FRONTIERS IN PLANT SCIENCE 2022; 12:760516. [PMID: 35126407 PMCID: PMC8811913 DOI: 10.3389/fpls.2021.760516] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 11/19/2021] [Indexed: 06/14/2023]
Abstract
Microalgae have adapted to face abiotic stresses by accumulating energy storage molecules such as lipids, which are also of interest to industries. Unfortunately, the impairment in cell division during the accumulation of these molecules constitutes a major bottleneck for the development of efficient microalgae-based biotechnology processes. To address the bottleneck, a multidisciplinary approach was used to study the mechanisms involved in the transition from nitrogen repletion to nitrogen starvation conditions in the marine diatom Phaeodactylum tricornutum that was cultured in a turbidostat. Combining data demonstrate that the different steps of nitrogen deficiency clustered together in a single state in which cells are in equilibrium with their environment. The switch between the nitrogen-replete and the nitrogen-deficient equilibrium is driven by intracellular nitrogen availability. The switch induces a major gene expression change, which is reflected in the reorientation of the carbon metabolism toward an energy storage mode while still operating as a metabolic flywheel. Although the photosynthetic activity is reduced, the chloroplast is kept in a stand-by mode allowing a fast resuming upon nitrogen repletion. Altogether, these results contribute to the understanding of the intricate response of diatoms under stress.
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Affiliation(s)
- Matteo Scarsini
- Metabolism, Bio-Engineering of Microalgal Molecules and Applications (MIMMA), Mer Molécules Santé, IUML—FR 3473 CNRS, Le Mans University, Le Mans, France
| | - Stanislas Thiriet-Rupert
- Metabolism, Bio-Engineering of Microalgal Molecules and Applications (MIMMA), Mer Molécules Santé, IUML—FR 3473 CNRS, Le Mans University, Le Mans, France
- Institut Pasteur, Genetics of Biofilms Laboratory, Paris, France
| | - Brigitte Veidl
- Metabolism, Bio-Engineering of Microalgal Molecules and Applications (MIMMA), Mer Molécules Santé, IUML—FR 3473 CNRS, Le Mans University, Le Mans, France
| | - Florence Mondeguer
- Phycotoxins Laboratory, Institut Français de Recherche pour l'Exploitation de la Mer, Nantes, France
| | - Hanhua Hu
- Key Laboratory of Algal Biology, Chinese Academy of Sciences, Wuhan, China
| | - Justine Marchand
- Metabolism, Bio-Engineering of Microalgal Molecules and Applications (MIMMA), Mer Molécules Santé, IUML—FR 3473 CNRS, Le Mans University, Le Mans, France
| | - Benoît Schoefs
- Metabolism, Bio-Engineering of Microalgal Molecules and Applications (MIMMA), Mer Molécules Santé, IUML—FR 3473 CNRS, Le Mans University, Le Mans, France
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13
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Michel-Rodriguez M, Lefebvre S, Crouvoisier M, Mériaux X, Lizon F. Underwater light climate and wavelength dependence of microalgae photosynthetic parameters in a temperate sea. PeerJ 2021; 9:e12101. [PMID: 34707925 PMCID: PMC8496463 DOI: 10.7717/peerj.12101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 08/11/2021] [Indexed: 11/20/2022] Open
Abstract
Studying how natural phytoplankton adjust their photosynthetic properties to the quantity and quality of underwater light (i.e. light climate) is essential to understand primary production. A wavelength-dependent photoacclimation strategy was assessed using a multi-color pulse-amplitude-modulation chlorophyll fluorometer for phytoplankton samples collected in the spring at 19 locations across the English Channel. The functional absorption cross section of photosystem II, photosynthetic electron transport (PETλ) parameters and non-photochemical quenching were analyzed using an original approach with a sequence of three statistical analyses. Linear mixed-effects models using wavelength as a longitudinal variable were first applied to distinguish the fixed effect of the population from the random effect of individuals. Population and individual trends of wavelength-dependent PETλ parameters were consistent with photosynthesis and photoacclimation theories. The natural phytoplankton communities studied were in a photoprotective state for blue wavelengths (440 and 480 nm), but not for other wavelengths (green (540 nm), amber (590 nm) and light red (625 nm)). Population-detrended PETλ values were then used in multivariate analyses (partial triadic analysis and redundancy analysis) to study ecological implications of PETλ dynamics among water masses. Two wavelength ratios based on the microalgae saturation parameter Ek (in relative and absolute units), related to the hydrodynamic regime and underwater light climate, clearly confirmed the physiological state of microalgae. They also illustrate more accurately that natural phytoplankton communities can implement photoacclimation processes that are influenced by in situ light quality during the daylight cycle in temporarily and weakly stratified water. Ecological implications and consequences of PETλ are discussed in the context of turbulent coastal ecosystems.
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Affiliation(s)
- Monica Michel-Rodriguez
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187 LOG, Laboratoire d'Océanologie et de Géosciences, Lille, France
| | - Sebastien Lefebvre
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187 LOG, Laboratoire d'Océanologie et de Géosciences, Lille, France
| | - Muriel Crouvoisier
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187 LOG, Laboratoire d'Océanologie et de Géosciences, Lille, France
| | - Xavier Mériaux
- Univ. Littoral Côte d'Opale, CNRS, Univ. Lille, UMR 8187-LOG-Laboratoire d'Océanologie et de Géosciences, Wimereux, France
| | - Fabrice Lizon
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187 LOG, Laboratoire d'Océanologie et de Géosciences, Lille, France
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14
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Johnsen G, Zolich A, Grant S, Bjørgum R, Cohen JH, McKee D, Kopec TP, Vogedes D, Berge J. All-sky camera system providing high temporal resolution annual time series of irradiance in the Arctic. APPLIED OPTICS 2021; 60:6456-6468. [PMID: 34612881 DOI: 10.1364/ao.424871] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/29/2021] [Indexed: 06/13/2023]
Abstract
The ArcLight observatory provides hourly continuous time series of light regime data (intensity, spectral composition, and photoperiod) from the Arctic, Svalbard at 79° N. Until now, no complete annual time series of biologically relevant light has been provided from the high Arctic due to insufficient sensitivity of commercial light sensors during the Polar Night. We describe a camera system providing all-sky images and the corresponding integrated spectral irradiance (EPAR) in energy or quanta units, throughout a complete annual cycle. We present hourly-diel-annual dynamics from 2017 to 2020 of irradiance and its relation to weather conditions, sun and moon trajectories.
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15
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Iwasaki K, Evenhuis C, Tamburic B, Kuzhiumparambil U, O'Connor W, Ralph P, Szabó M. Improving light and CO2 availability to enhance the growth rate of the diatom, Chaetoceros muelleri. ALGAL RES 2021. [DOI: 10.1016/j.algal.2021.102234] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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16
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Li S, Zheng X, Fang Q, Gong Y, Wang H. Exploring the potential of photosynthetic induction factor for the commercial production of fucoxanthin in Phaeodactylum tricornutum. Bioprocess Biosyst Eng 2021; 44:1769-1779. [PMID: 33844074 DOI: 10.1007/s00449-021-02559-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 03/20/2021] [Indexed: 12/19/2022]
Abstract
Currently, the market price of fucoxanthin-based drugs remains high primarily because, on one hand, the main natural source of fucoxanthin, Phaeodactylum tricornutum (P. tricornutum), is extremely low in endogenous fucoxanthin, while, on the other hand, fucoxanthin mass production has proved to be very challenging. In this study, we demonstrated the feasibility of increasing fucoxanthin bioaccumulation in P. tricornutum by promoting photosynthetic activity of this diatom. Specifically, this study investigated the effects of different concentrations of the photosynthetic induction factor (PIF) on fucoxanthin content and biosynthesis, on chlorophyll fluorescence characteristics, and on the expression of photosynthesis-related genes in P. tricornutum. The results showed that the optimal PIF concentration was 1 µg L-1, while optimal time was 48 h, with the effect decreasing at 72 h. Fucoxanthin content increased by 44.2% compared to that of the control group in 48 h. Correlation analysis showed a significant positive correlation between fucoxanthin content and the actual photosynthetic yield of PS II (r = 0.949, P < 0.01). The total amount of energy actually used in photosystem II (PS II) by photosynthesis may be used as the main components affecting the biosynthesis of fucoxanthin in P. tricornutum. In addition, we found that using PIF to promote photosynthesis in P. tricornutum effectively increased the growth rate and bioaccumulation of fucoxanthin to an economically advantageous level, thereby providing a novel strategy for the commercial production of fucoxanthin.
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Affiliation(s)
- Shenrui Li
- Key Laboratory of Applied Marine Biotechnology of Department of Education, School of Marine Sciences, Ningbo University, Ningbo, Zhejiang, 315211, People's Republic of China
| | - Xiaoyun Zheng
- Key Laboratory of Applied Marine Biotechnology of Department of Education, School of Marine Sciences, Ningbo University, Ningbo, Zhejiang, 315211, People's Republic of China
| | - Qingshu Fang
- Key Laboratory of Applied Marine Biotechnology of Department of Education, School of Marine Sciences, Ningbo University, Ningbo, Zhejiang, 315211, People's Republic of China
| | - Yifu Gong
- Key Laboratory of Applied Marine Biotechnology of Department of Education, School of Marine Sciences, Ningbo University, Ningbo, Zhejiang, 315211, People's Republic of China.
| | - Heyu Wang
- College of Food and Pharmaceutical Sciences, Ningbo, Zhejiang, 315211, People's Republic of China
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17
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Santin A, Caputi L, Longo A, Chiurazzi M, Ribera d'Alcalà M, Russo MT, Ferrante MI, Rogato A. Integrative omics identification, evolutionary and structural analysis of low affinity nitrate transporters in diatoms, diNPFs. Open Biol 2021; 11:200395. [PMID: 33823659 PMCID: PMC8025304 DOI: 10.1098/rsob.200395] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Diatoms are one of the major and most diverse groups of phytoplankton, with chimeric genomes harbouring a combination of genes of bacterial, animal and plant origin. They have developed sophisticated mechanisms to face environmental variations. In marine environments, nutrients concentration shows significant temporal and spatial variability, influencing phytoplankton growth. Among nutrients, nitrogen, present at micromolar levels, is often a limiting resource. Here, we report a comprehensive characterization of the Nitrate Transporter 1/Peptide Transporter Family (NPF) in diatoms, diNPFs. NPFs are well characterized in many organisms where they recognize a broad range of substrates, ranging from short-chained di- and tri-peptides in bacteria, fungi and mammals to a wide variety of molecules including nitrate in higher plants. Scarce information is available for diNPFs. We integrated-omics, phylogenetic, structural and expression analyses, to infer information on their role in diatoms. diNPF genes diverged to produce two distinct clades with strong sequence and structural homology with either bacterial or plant NPFs, with different predicted sub-cellular localization, suggesting that the divergence resulted in functional diversification. Moreover, transcription analysis of diNPF genes under different laboratory and environmental growth conditions suggests that diNPF diversification led to genetic adaptations that might contribute to diatoms ability to flourish in diverse environmental conditions.
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Affiliation(s)
- Anna Santin
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
| | - Luigi Caputi
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
| | - Antonella Longo
- BioDiscovery Institute, Denton, TX, USA.,Department of Biological Sciences, University of North Texas, Denton, TX, USA
| | - Maurizio Chiurazzi
- Institute of Biosciences and BioResources, CNR, Via P. Castellino 111, 80131 Naples, Italy
| | | | | | | | - Alessandra Rogato
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy.,Institute of Biosciences and BioResources, CNR, Via P. Castellino 111, 80131 Naples, Italy
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18
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Kayanja GE, Ibrahim IM, Puthiyaveetil S. Regulation of Phaeodactylum plastid gene transcription by redox, light, and circadian signals. PHOTOSYNTHESIS RESEARCH 2021; 147:317-328. [PMID: 33387192 DOI: 10.1007/s11120-020-00811-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 12/03/2020] [Indexed: 06/12/2023]
Abstract
Diatoms are a diverse group of photosynthetic unicellular algae with a plastid of red-algal origin. As prolific primary producers in the ocean, diatoms fix as much carbon as all rainforests combined. The molecular mechanisms that contribute to the high photosynthetic productivity and ecological success of diatoms are however not yet fully understood. Using the model diatom Phaeodactylum tricornutum, here we show rhythmic transcript accumulation of plastid psaA, psbA, petB, and atpB genes as driven by a free running circadian clock. Treatment with the electron transport inhibitor 3-(3,4-dichlorophenyl)-1,1-dimethylurea overrides the circadian signal by markedly downregulating transcription of psaA, petB, and atpB genes but not the psbA gene. Changes in light quantity produce little change in plastid gene transcription while the effect of light quality seems modest with only the psaA gene responding in a pattern that is dependent on the redox state of the plastoquinone pool. The significance of these plastid transcriptional responses and the identity of the underlying genetic control systems are discussed with relevance to diatom photosynthetic acclimation.
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Affiliation(s)
- Gilbert E Kayanja
- Department of Biochemistry and Center for Plant Biology, Purdue University, West Lafayette, IN, 47907, USA
| | - Iskander M Ibrahim
- Department of Biochemistry and Center for Plant Biology, Purdue University, West Lafayette, IN, 47907, USA
| | - Sujith Puthiyaveetil
- Department of Biochemistry and Center for Plant Biology, Purdue University, West Lafayette, IN, 47907, USA.
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19
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Mann M, Serif M, Wrobel T, Eisenhut M, Madhuri S, Flachbart S, Weber APM, Lepetit B, Wilhelm C, Kroth PG. The Aureochrome Photoreceptor PtAUREO1a Is a Highly Effective Blue Light Switch in Diatoms. iScience 2020; 23:101730. [PMID: 33235981 PMCID: PMC7670200 DOI: 10.1016/j.isci.2020.101730] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/30/2020] [Accepted: 10/21/2020] [Indexed: 02/08/2023] Open
Abstract
Aureochromes represent a unique type of blue light photoreceptors that possess a blue light sensing flavin-binding LOV-domain and a DNA-binding bZIP domain, thus being light-driven transcription factors. The diatom Phaeodactylum tricornutum, a member of the essential marine primary producers, possesses four aureochromes (PtAUREO1a, 1b, 1c, 2). Here we show a dramatic change in the global gene expression pattern of P. tricornutum wild-type cells after a shift from red to blue light. About 75% of the genes show significantly changed transcript levels already after 10 and 60 min of blue light exposure, which includes genes of major transcription factors as well as other photoreceptors. Very surprisingly, this light-induced regulation of gene expression is almost completely inhibited in independent PtAureo1a knockout lines. Such a massive and fast transcriptional change depending on one single photoreceptor is so far unprecedented. We conclude that PtAUREO1a plays a key role in diatoms upon blue light exposure. Blue light induces a very fast transcriptional response in the diatom P. tricornutum This strong response is almost completely inhibited when Aureochrome 1a is absent The results imply a key role of PtAureo1a in blue light-induced responses in diatoms
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Affiliation(s)
- Marcus Mann
- Institut für Biologie, Universität Leipzig, 04009 Leipzig, Germany
| | - Manuel Serif
- Fachbereich Biologie, Universität Konstanz, 78457 Konstanz, Germany
| | - Thomas Wrobel
- Institut für Biochemie der Pflanzen, Cluster of Excellence on Plant Science (CEPLAS), Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Marion Eisenhut
- Institut für Biochemie der Pflanzen, Cluster of Excellence on Plant Science (CEPLAS), Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Shvaita Madhuri
- Fachbereich Biologie, Universität Konstanz, 78457 Konstanz, Germany
| | - Samantha Flachbart
- Institut für Biochemie der Pflanzen, Cluster of Excellence on Plant Science (CEPLAS), Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Andreas P M Weber
- Institut für Biochemie der Pflanzen, Cluster of Excellence on Plant Science (CEPLAS), Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Bernard Lepetit
- Fachbereich Biologie, Universität Konstanz, 78457 Konstanz, Germany
| | | | - Peter G Kroth
- Fachbereich Biologie, Universität Konstanz, 78457 Konstanz, Germany
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20
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Yang R, Wei D, Xie J. Diatoms as cell factories for high-value products: chrysolaminarin, eicosapentaenoic acid, and fucoxanthin. Crit Rev Biotechnol 2020; 40:993-1009. [DOI: 10.1080/07388551.2020.1805402] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Runqing Yang
- School of Food Science and Engineering, South China University of Technology, Guangzhou, People’s Republic of China
| | - Dong Wei
- School of Food Science and Engineering, South China University of Technology, Guangzhou, People’s Republic of China
| | - Jun Xie
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Chinese Academy of Fishery Sciences Pearl River Fisheries Research Institute, Guangzhou, People’s Republic of China
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21
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Yang R, Wei D. Improving Fucoxanthin Production in Mixotrophic Culture of Marine Diatom Phaeodactylum tricornutum by LED Light Shift and Nitrogen Supplementation. Front Bioeng Biotechnol 2020; 8:820. [PMID: 32760713 PMCID: PMC7373720 DOI: 10.3389/fbioe.2020.00820] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 06/26/2020] [Indexed: 12/13/2022] Open
Abstract
Fucoxanthin (Fx), a kind of primary carotenoids in brown seaweeds and diatoms, has attractive efficacy in human's healthcare including loss weight, the prevention of diabetes and Alzheimer's disease. Marine diatom Phaeodactylum tricornutum is now realized as a promising producer for commercial Fx production due to its higher content of Fx than brown seaweeds with easily artificial cultivation and Fx extraction. In the present study, to improve Fx production in P. tricornutum, the mixotrophic cultures were applied to optimize initial cell density, light intensity, light regime and nitrogen supplementation. The results showed that the higher initial cell density (1 × 107 cells mL-1) and lower light intensity (20 μmol m-2 s-1) were favorable for biomass production and Fx accumulation. The maximal Fx content [16.28 mg g-1 dry weight (DW)] could be achieved under blue light (BL), but the highest biomass concentration (5.53 g L-1) could be attained under red: blue light (R: B, 6:1) in the batch culture. A novel two-phase culture approach was developed to increase the biomass concentration to the highest value (6.52 g L-1) with the maximal productivity of Fx (8.22 mg L-1 d-1) through light shift from R:B ratio (6:1) in phase 1 to R:B ratio (5:1) by enhancing BL and tryptone addition in phase 2. The content and intracellular amount of Fx were also increased 8% and 12% in phase 2 compared to phase 1. The expression levels analysis revealed that genes encoding phytoene synthase (PSY), zeaxanthin epoxidase (ZEP), and fucoxanthin-chlorophyll-protein b (FCPb) were upregulated significantly, with downregulation of the gene encoding violaxanthin de-epoxidase (VDE), leading to the improvement of Fx in phase 2. The present study demonstrated the two-phase culture strategy could promote Fx productivity through enhancing biomass production and increasing Fx content, indicating that strengthening BL coupled with adding tryptone were effective to facilitate Fx production by mixotrophic cultivation of marine diatom P. tricornutum.
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Affiliation(s)
- Runqing Yang
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
| | - Dong Wei
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
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22
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Osuna-Cruz CM, Bilcke G, Vancaester E, De Decker S, Bones AM, Winge P, Poulsen N, Bulankova P, Verhelst B, Audoor S, Belisova D, Pargana A, Russo M, Stock F, Cirri E, Brembu T, Pohnert G, Piganeau G, Ferrante MI, Mock T, Sterck L, Sabbe K, De Veylder L, Vyverman W, Vandepoele K. The Seminavis robusta genome provides insights into the evolutionary adaptations of benthic diatoms. Nat Commun 2020; 11:3320. [PMID: 32620776 PMCID: PMC7335047 DOI: 10.1038/s41467-020-17191-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 06/12/2020] [Indexed: 12/15/2022] Open
Abstract
Benthic diatoms are the main primary producers in shallow freshwater and coastal environments, fulfilling important ecological functions such as nutrient cycling and sediment stabilization. However, little is known about their evolutionary adaptations to these highly structured but heterogeneous environments. Here, we report a reference genome for the marine biofilm-forming diatom Seminavis robusta, showing that gene family expansions are responsible for a quarter of all 36,254 protein-coding genes. Tandem duplications play a key role in extending the repertoire of specific gene functions, including light and oxygen sensing, which are probably central for its adaptation to benthic habitats. Genes differentially expressed during interactions with bacteria are strongly conserved in other benthic diatoms while many species-specific genes are strongly upregulated during sexual reproduction. Combined with re-sequencing data from 48 strains, our results offer insights into the genetic diversity and gene functions in benthic diatoms.
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Affiliation(s)
- Cristina Maria Osuna-Cruz
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052, Ghent, Belgium
- Bioinformatics Institute Ghent, Ghent University, Technologiepark 71, 9052, Ghent, Belgium
| | - Gust Bilcke
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052, Ghent, Belgium
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, 9000, Ghent, Belgium
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, 9000, Ghent, Belgium
| | - Emmelien Vancaester
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052, Ghent, Belgium
- Bioinformatics Institute Ghent, Ghent University, Technologiepark 71, 9052, Ghent, Belgium
| | - Sam De Decker
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, 9000, Ghent, Belgium
| | - Atle M Bones
- Cell Molecular Biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Per Winge
- Cell Molecular Biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Nicole Poulsen
- B CUBE Center for Molecular Bioengineering, Technical University of Dresden, Tatzberg 41, 01307, Dresden, Germany
| | - Petra Bulankova
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052, Ghent, Belgium
| | - Bram Verhelst
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052, Ghent, Belgium
| | - Sien Audoor
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, 9000, Ghent, Belgium
| | - Darja Belisova
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, 9000, Ghent, Belgium
| | - Aikaterini Pargana
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, 9000, Ghent, Belgium
| | - Monia Russo
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, Naples, Italy
| | - Frederike Stock
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, 9000, Ghent, Belgium
| | - Emilio Cirri
- Friedrich Schiller University Jena, Institute of Inorganic and Analytical Chemistry, Lessingstrasse 8, 07745, Jena, Germany
| | - Tore Brembu
- Cell Molecular Biology and Genomics Group, Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Georg Pohnert
- Friedrich Schiller University Jena, Institute of Inorganic and Analytical Chemistry, Lessingstrasse 8, 07745, Jena, Germany
| | - Gwenael Piganeau
- Sorbonne Université, CNRS, UMR 7232 Biologie Intégrative des Organismes Marins BIOM, Observatoire Océanologique, F-66650, Banyuls-sur-Mer, France
| | | | - Thomas Mock
- School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK
| | - Lieven Sterck
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052, Ghent, Belgium
| | - Koen Sabbe
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, 9000, Ghent, Belgium
| | - Lieven De Veylder
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052, Ghent, Belgium
| | - Wim Vyverman
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, 9000, Ghent, Belgium
| | - Klaas Vandepoele
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052, Ghent, Belgium.
- VIB Center for Plant Systems Biology, Technologiepark 71, 9052, Ghent, Belgium.
- Bioinformatics Institute Ghent, Ghent University, Technologiepark 71, 9052, Ghent, Belgium.
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Wei L, You W, Gong Y, El Hajjami M, Liang W, Xu J, Poetsch A. Transcriptomic and proteomic choreography in response to light quality variation reveals key adaption mechanisms in marine Nannochloropsis oceanica. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 720:137667. [PMID: 32325597 DOI: 10.1016/j.scitotenv.2020.137667] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 02/04/2020] [Accepted: 02/29/2020] [Indexed: 06/11/2023]
Abstract
Photosynthetic organisms need to respond frequently to the fluctuation of light quality and light quantity in their habitat. In response to the fluctuation of different single wavelength lights, these organisms have to adjust and optimize the employment of light energy by redistributing excitation energy and remodeling photosystem stoichiometry or light complex structure. However, the response of whole cellular processes to fluctuations in single wavelength light is mostly unknown. Here, we report the transcriptomic and proteomic dynamics and metabolic adaptation mechanisms of Nannochloropsis oceanica to blue and red light. Preferential exposure to different light spectra induces massive reprogramming of the Nannochloropsis transcriptome and proteome. Combined with physiological and biochemical investigation, the rewiring of many cellular processes was observed, including carbon/nitrogen assimilation, photosynthesis, chlorophyll and cartenoid biosynthesis, reactive oxygen species (ROS) scavenging systems, and chromatin state regulation. A strong and rapid regulation of genes or proteins related to nitrogen metabolism, photosynthesis, chlorophyll synthesis, ROS scavenging system, and carotenoid metabolism were observed during 12 h and 24 h of exposure under red light. Additionally, two light harvesting complex proteins induced by blue light and one by red light were observed. The differential responses of N. oceanica to red and blue irradiation reveal how marine microalgae adapt to change in light quality and can be exploited for biofuel feedstock development.
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Affiliation(s)
- Li Wei
- Single-Cell Center, CAS Key Laboratory of Biofuels and Shandong Key Laboratory of Energy Genetics, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Wuxin You
- Single-Cell Center, CAS Key Laboratory of Biofuels and Shandong Key Laboratory of Energy Genetics, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, China; Department of Plant Biochemistry, Ruhr University Bochum, Bochum, Germany
| | - Yanhai Gong
- Single-Cell Center, CAS Key Laboratory of Biofuels and Shandong Key Laboratory of Energy Genetics, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, China
| | - Mohamed El Hajjami
- Department of Plant Biochemistry, Ruhr University Bochum, Bochum, Germany
| | - Wensi Liang
- Single-Cell Center, CAS Key Laboratory of Biofuels and Shandong Key Laboratory of Energy Genetics, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jian Xu
- Single-Cell Center, CAS Key Laboratory of Biofuels and Shandong Key Laboratory of Energy Genetics, Qingdao Institute of BioEnergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Ansgar Poetsch
- Department of Plant Biochemistry, Ruhr University Bochum, Bochum, Germany; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
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Milito A, Castellano I, Burn R, Seebeck FP, Brunet C, Palumbo A. First evidence of ovothiol biosynthesis in marine diatoms. Free Radic Biol Med 2020; 152:680-688. [PMID: 31935446 DOI: 10.1016/j.freeradbiomed.2020.01.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 01/10/2020] [Accepted: 01/10/2020] [Indexed: 12/26/2022]
Abstract
Ovothiols are histidine-derived thiols that are receiving a great interest for their biological activities in human model systems. Thanks to the position of the thiol group on the imidazole ring of histidine, these compounds exhibit unusual antioxidant properties. They have been revealing a very promising pharmacological potential due to their anti-proliferative and anti-inflammatory properties, as well as anti-fibrotic activities not always related to their antioxidant power. Ovothiols occur in three differentially methylated forms (A, B and C), isolated from ovary, eggs and biological fluids of many marine invertebrates, mollusks, microalgae, and pathogenic protozoa. These molecules are synthesized by two enzymes: the sulfoxide synthase OvoA and the sulfoxide lyase OvoB. OvoA catalyzes the insertion of the sulfur atom of cysteine on the imidazole ring of histidine, leading to the formation of a sulfoxide intermediate. This is then cleaved by OvoB, giving 5-thiohistidine, finally methylated on the imidazole ring thanks to the methyltransferase domain of OvoA. Recent studies have shown that OvoA homologs are encoded in a wide variety of genomes suggesting that ovothiol biosynthesis is much more widespread in nature than initially thought. Here we have investigated the OvoA occurrence in diatoms, one of the most abundant group of microalgae, dominating marine and freshwater environments. They are considered a very good model system for both biology/photophysiology studies and for biotechnological applications. We have performed comparative sequence and phylogenetic analyses of OvoA from diatoms, highlighting a high degree of conservation of the canonical domain architecture in the analyzed species, as well as a clear clustering of OvoA in the two different morphological groups, i.e. centric and pennate diatoms. The in silico analyses have also revealed that OvoA gene expression is modulated by growth conditions. More importantly, we have characterized the thiol fraction from cultures of the coastal centric diatom Skeletonema marinoi, providing the first evidence of ovothiol B biosynthesis in diatoms.
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Affiliation(s)
- Alfonsina Milito
- Dept. of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, 80121, Naples, Italy
| | - Immacolata Castellano
- Dept. of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, 80121, Naples, Italy
| | - Reto Burn
- Dept. of Chemistry, University of Basel, 4058, Basel, Switzerland
| | | | - Christophe Brunet
- Dept. of Marine Biotechnology, Stazione Zoologica Anton Dohrn, 80121, Naples, Italy
| | - Anna Palumbo
- Dept. of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, 80121, Naples, Italy.
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Early dynamics of photosynthetic Lhcf2 and Lhcf15 transcription and mRNA stabilities in response to herbivory-related decadienal in Phaeodactylum tricornutum. Sci Rep 2020; 10:2029. [PMID: 32029835 PMCID: PMC7005025 DOI: 10.1038/s41598-020-58885-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 01/21/2020] [Indexed: 12/31/2022] Open
Abstract
Abiotic and biotic stresses widely reduce light harvesting complex (LHC) gene expression in higher plants and algae. However, control mechanisms and functions of these changes are not well understood. During herbivory, marine diatom species release oxylipins that impair grazer reproduction and serve as signaling molecules to nearby undamaged diatoms. To examine LHC mRNA regulation by oxylipin exposure, the diatom Phaeodactylum tricornutum was treated with a sublethal concentration of trans,trans-2,4-decadienal (DD) during the light cycle. Transcriptome analyses revealed extensive suppression of LHC mRNAs and a smaller set of up-regulated LHC mRNAs at 3 h. For two divergently regulated LHCF antennae family mRNAs, in vivo 4-thiouracil metabolic labeling was used to distinguish synthesis and degradation rates. Within 3 h of DD exposure, Lhcf2 mRNA levels and transcription were strongly suppressed and its mRNA half-life decreased. In contrast, Lhcf15 mRNA mainly accumulated between 3-9 h, its transcription increased and its mRNA was highly stabilized. Hence, DD-treated cells utilized transcriptional and mRNA stability control mechanisms which were likely major factors in the differing Lhcf2 and Lhcf15 expression patterns. Widespread LHC mRNA regulation and possible effects on photosynthesis may contribute to enhanced fitness in cells impacted by herbivory and other stresses.
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Ait-Mohamed O, Novák Vanclová AMG, Joli N, Liang Y, Zhao X, Genovesio A, Tirichine L, Bowler C, Dorrell RG. PhaeoNet: A Holistic RNAseq-Based Portrait of Transcriptional Coordination in the Model Diatom Phaeodactylum tricornutum. FRONTIERS IN PLANT SCIENCE 2020; 11:590949. [PMID: 33178253 PMCID: PMC7596299 DOI: 10.3389/fpls.2020.590949] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 09/15/2020] [Indexed: 05/04/2023]
Abstract
Transcriptional coordination is a fundamental component of prokaryotic and eukaryotic cell biology, underpinning the cell cycle, physiological transitions, and facilitating holistic responses to environmental stress, but its overall dynamics in eukaryotic algae remain poorly understood. Better understanding of transcriptional partitioning may provide key insights into the primary metabolism pathways of eukaryotic algae, which frequently depend on intricate metabolic associations between the chloroplasts and mitochondria that are not found in plants. Here, we exploit 187 publically available RNAseq datasets generated under varying nitrogen, iron and phosphate growth conditions to understand the co-regulatory principles underpinning transcription in the model diatom Phaeodactylum tricornutum. Using WGCNA (Weighted Gene Correlation Network Analysis), we identify 28 merged modules of co-expressed genes in the P. tricornutum genome, which show high connectivity and correlate well with previous microarray-based surveys of gene co-regulation in this species. We use combined functional, subcellular localization and evolutionary annotations to reveal the fundamental principles underpinning the transcriptional co-regulation of genes implicated in P. tricornutum chloroplast and mitochondrial metabolism, as well as the functions of diverse transcription factors underpinning this co-regulation. The resource is publically available as PhaeoNet, an advanced tool to understand diatom gene co-regulation.
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Affiliation(s)
- Ouardia Ait-Mohamed
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France
| | - Anna M. G. Novák Vanclová
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France
| | - Nathalie Joli
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France
| | - Yue Liang
- Department of Oceanography, Dalhousie University, Halifax, NS, Canada
| | - Xue Zhao
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France
- Université de Nantes, CNRS, UFIP, UMR 6286, Nantes, France
| | - Auguste Genovesio
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France
| | - Leila Tirichine
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France
- Université de Nantes, CNRS, UFIP, UMR 6286, Nantes, France
- *Correspondence: Leila Tirichine,
| | - Chris Bowler
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France
- Chris Bowler,
| | - Richard G. Dorrell
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, Paris, France
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28
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Bonnanfant M, Jesus B, Pruvost J, Mouget JL, Campbell DA. Photosynthetic electron transport transients in Chlorella vulgaris under fluctuating light. ALGAL RES 2019. [DOI: 10.1016/j.algal.2019.101713] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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29
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Nymark M, Volpe C, Hafskjold MCG, Kirst H, Serif M, Vadstein O, Bones AM, Melis A, Winge P. Loss of ALBINO3b Insertase Results in Truncated Light-Harvesting Antenna in Diatoms. PLANT PHYSIOLOGY 2019; 181:1257-1276. [PMID: 31467163 PMCID: PMC6836812 DOI: 10.1104/pp.19.00868] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 08/10/2019] [Indexed: 05/13/2023]
Abstract
The family of chloroplast ALBINO3 (ALB3) proteins function in the insertion and assembly of thylakoid membrane protein complexes. Loss of ALB3b in the marine diatom Phaeodactylum tricornutum leads to a striking change of cell color from the normal brown to green. A 75% decrease of the main fucoxanthin-chlorophyll a/c-binding proteins was identified in the alb3b strains as the cause of changes in the spectral properties of the mutant cells. The alb3b lines exhibit a truncated light-harvesting antenna phenotype with reduced amounts of light-harvesting pigments and require a higher light intensity for saturation of photosynthesis. Accumulation of photoprotective pigments and light-harvesting complex stress-related proteins was not negatively affected in the mutant strains, but still the capacity for nonphotochemical quenching was lower compared with the wild type. In plants and green algae, ALB3 proteins interact with members of the chloroplast signal recognition particle pathway through a Lys-rich C-terminal domain. A novel conserved C-terminal domain was identified in diatoms and other stramenopiles, questioning if ALB3b proteins have the same interaction partners as their plant/green algae homologs.
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Affiliation(s)
- Marianne Nymark
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Charlotte Volpe
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | | | - Henning Kirst
- Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
| | - Manuel Serif
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Olav Vadstein
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Atle Magnar Bones
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Anastasios Melis
- Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
| | - Per Winge
- Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
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30
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Su Y. The effect of different light regimes on pigments in Coscinodiscus granii. PHOTOSYNTHESIS RESEARCH 2019; 140:301-310. [PMID: 30478709 DOI: 10.1007/s11120-018-0608-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Accepted: 11/20/2018] [Indexed: 06/09/2023]
Abstract
The influence of six different light regimes throughout the photosynthetically active radiation range (from 400 to 700 nm, including blue, green, yellow, red-orange, red, and white) at two intensities (100 and 300 µmol photons m-2 s-1) on pigmentation was assessed for the centric marine diatom Coscinodiscus granii for the first time. Chlorophyll (Chl) a and fucoxanthin were the dominating pigments in all treatments. The cellular concentrations of light harvesting pigment (Chl a, Chl c1 + c2, and fucoxanthin) were higher at 100 than at 300 µmol photons m-2 s-1 at all wavelengths, with the largest increases at red and blue light. The normalized concentrations of photoprotective pigments (violaxanthin, zeaxanthin, diadinoxanthin, and diatoxanthin) were higher at high light intensity than in cells grown at low light intensity. An increase in β-carotene in low light conditions is expected as the increased Chl a was related to increased photosynthetic subunits which require β-carotene (bound to photosystem core). At 300 µmol photons m-2 s-1, yellow light resulted in significantly lower concentration of most of the detected pigments than the other wavelengths. At 100 µmol photons m-2 s-1, W and B light led to statistically lower and higher concentration of most of the detected pigments than the other wavelengths, respectively.
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Affiliation(s)
- Yanyan Su
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg, Denmark.
- Carlsberg Research Laboratory, Bjerregaardsvej 5, 2500, Valby, Denmark.
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31
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Teng L, Fan X, Nelson DR, Han W, Zhang X, Xu D, Renault H, Markov GV, Ye N. Diversity and evolution of cytochromes P450 in stramenopiles. PLANTA 2019; 249:647-661. [PMID: 30341489 DOI: 10.1007/s00425-018-3028-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 10/08/2018] [Indexed: 06/08/2023]
Abstract
MAIN CONCLUSION Comparative genomic analysis of cytochromes P450 revealed high diversification and dynamic changes in stramenopiles, associated with transcriptional responsiveness to various environmental stimuli. Comparative genomic and molecular evolution approaches were used to characterize cytochromes P450 (P450) diversity in stramenopiles. Phylogenetic analysis pointed to a high diversity of P450 in stramenopiles and identified three major clans. The CYP51 and CYP97 clans were present in brown algae, diatoms and Nannochloropsis gaditana, whereas the CYP5014 clan mainly includes oomycetes. Gene gain and loss patterns revealed that six CYP families-CYP51, CYP97, CYP5160, CYP5021, CYP5022, and CYP5165-predated the split of brown algae and diatoms. After they diverged, diatoms gained more CYP families, especially in the cold-adapted species Fragilariopsis cylindrus, in which eight new CYP families were found. Selection analysis revealed that the expanded CYP51 family in the brown alga Cladosiphon okamuranus exhibited a more relaxed selection constraint compared with those of other brown algae and diatoms. Our RNA-seq data further evidenced that most of P450s in Saccharina japonica are highly expressed in large sporophytes, which could potentially promote the large kelp formation in this developmental stage. A survey of Ectocarpus siliculosus and diatom transcriptomes showed that many P450s are responsive to stress, nutrient limitation or light quality, suggesting pivotal roles in detoxification or metabolic processes under adverse environmental conditions. The information provided in this study will be helpful in designing functional experiments and interpreting P450 roles in this particular lineage.
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Affiliation(s)
- Linhong Teng
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
- Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China
| | - Xiao Fan
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - David R Nelson
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, 858 Madison Ave. Suite G01, Memphis, 38163, TN, USA
| | - Wentao Han
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Xiaowen Zhang
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Dong Xu
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Hugues Renault
- Institute of Plant Molecular Biology, CNRS, University of Strasbourg, 67084, Strasbourg, France
| | - Gabriel V Markov
- Sorbonne Université, CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), 29680, Roscoff, France
| | - Naihao Ye
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China.
- Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China.
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Johnsen G, Norli M, Moline M, Robbins I, von Quillfeldt C, Sørensen K, Cottier F, Berge J. The advective origin of an under-ice spring bloom in the Arctic Ocean using multiple observational platforms. Polar Biol 2018; 41:1197-1216. [PMID: 30996513 PMCID: PMC6438636 DOI: 10.1007/s00300-018-2278-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 01/23/2018] [Accepted: 02/02/2018] [Indexed: 11/27/2022]
Abstract
Under-ice blooms of phytoplankton in the Chukchi Sea have been observed, with strong implications for our understanding of the production regimes in the Arctic Ocean. Using a combination of satellite remote sensing of phytoplankton biomass, in situ observations under sea ice from an autonomous underwater vehicle (AUV), and in vivo photophysiology, we examined the composition, magnitude and origin of a bloom detected beneath the sea ice Northwest of Svalbard (Southern Yermak Plateau) in May 2010. In situ concentration of up to 20 mg chlorophyll a [Chl a] m−3, were dominated by the northern planktonic spring species of diatoms, Thalassiosira nordenskioeldii, T. antarctica var. borealis, Chaetoceros socialisspecies complex and Fragilariopsis oceanica. These species were also found south of the marginal ice zone (MIZ). Cells in the water column under the sea ice were typically high-light acclimated, with a mean light saturation index (Ek) of 138 μmol photons m−2 s−1 and a ratio between photoprotective carotenoids (PPC) and Chl a (w:w) of 0.2. Remotely sensed data of [Chl a] showed a 32,000 km2 bloom developing south of the MIZ. In effect, our data suggest that the observed under-ice bloom was in fact a bloom developed in open waters south of the ice edge, and that a combination of northward-flowing water masses and southward drifting sea ice effectively positioned the bloom under the sea ice. This have implications for our general understanding of under-ice blooms, suggesting that their origin and connection with open water may be different in different regions of the Arctic.
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Affiliation(s)
- Geir Johnsen
- Centre for Autonomous Marine Operations and Systems, Department of Biology, Norwegian University of Technology and Science (NTNU), 7491 Trondheim, Norway
- Department of Arctic Biology, University Centre on Svalbard (UNIS), 9171 Longyearbyen, Norway
| | - Marit Norli
- Centre for Autonomous Marine Operations and Systems, Department of Biology, Norwegian University of Technology and Science (NTNU), 7491 Trondheim, Norway
- Section of Marine Biogeochemistry and Oceanography, Norwegian Institute of Water Research (NIVA), 0349 Oslo, Norway
| | - Mark Moline
- School of Marine Science and Policy, University of Delaware, Newark, DE 19958 USA
| | - Ian Robbins
- California Polytechnic State University, San Luis Obispo, CA 93407 USA
| | - Cecilie von Quillfeldt
- Department of Environment and Mapping, Norwegian Polar Institute (NP), 9296 Tromsø, Norway
| | - Kai Sørensen
- Section of Marine Biogeochemistry and Oceanography, Norwegian Institute of Water Research (NIVA), 0349 Oslo, Norway
| | - Finlo Cottier
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037 Tromsø, Norway
- Scottish Association for Marine Science (SAMS), Oban, Argyll, PA37 1QA UK
| | - Jørgen Berge
- Centre for Autonomous Marine Operations and Systems, Department of Biology, Norwegian University of Technology and Science (NTNU), 7491 Trondheim, Norway
- Department of Arctic Biology, University Centre on Svalbard (UNIS), 9171 Longyearbyen, Norway
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037 Tromsø, Norway
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König S, Eisenhut M, Bräutigam A, Kurz S, Weber APM, Büchel C. The Influence of a Cryptochrome on the Gene Expression Profile in the Diatom Phaeodactylum tricornutum under Blue Light and in Darkness. PLANT & CELL PHYSIOLOGY 2017; 58:1914-1923. [PMID: 29016997 DOI: 10.1093/pcp/pcx127] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 08/21/2017] [Indexed: 06/07/2023]
Abstract
Diatoms, albeit being only distantly related with higher plants, harbor a plant-like cryptochrome (CryP) that was proposed to act as a photoreceptor required for the regulation of some photosynthetic proteins. Plant cryptochromes are involved in the regulation of developmental processes relevant only to multicellular organisms. Their role in the unicellular diatoms to date is mostly enigmatic. To elucidate the function of this plant-like cryptochrome in a unicellular species, we examined the role of CryP in the regulation of transcription in the diatom Phaeodactylum tricornutum by comparative RNA-seq of wild type and CryP knock-down mutants, under prolonged darkness and one hour after onset of blue light. In total, mRNAs of 12,298 genes were identified and more than 70% of the genes could be sorted into functional bins. CryP influenced groups of transcripts in three different ways: some transcripts displayed altered expression under blue light only, others independent of the light condition, and, surprisingly, some were influenced by CryP only in darkness. Genes regulated in any condition were distributed over almost all functional categories. CryP exerted an influence on two other photoreceptors: the genes encoding phytochrome and CPF1, another cryptochrome, which were down-regulated by CryP independent of the light condition. However, the regulatory responses of the affected photoreceptors on transcriptional output were independent. The influence of CryP on the expression of other photoreceptors hints to the existence of a regulatory signaling network in diatoms that includes several cryptochromes and phytochrome, whereby CryP acts as a regulator of transcript abundance under light as well as in darkness.
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Affiliation(s)
- Sarah König
- Goethe University Frankfurt, Max von Laue Str. 9, 60438 Frankfurt, Germany
| | - Marion Eisenhut
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Sciences, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Andrea Bräutigam
- IPK Gatersleben, Network Analysis and Modeling, Corrensstrasse 3, 06466 Seeland, Germany
| | - Samantha Kurz
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Sciences, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Andreas P M Weber
- Institute of Plant Biochemistry, Cluster of Excellence on Plant Sciences, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Claudia Büchel
- Goethe University Frankfurt, Max von Laue Str. 9, 60438 Frankfurt, Germany
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Herbstová M, Bína D, Kaňa R, Vácha F, Litvín R. Red-light phenotype in a marine diatom involves a specialized oligomeric red-shifted antenna and altered cell morphology. Sci Rep 2017; 7:11976. [PMID: 28931902 PMCID: PMC5607283 DOI: 10.1038/s41598-017-12247-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 09/06/2017] [Indexed: 01/12/2023] Open
Abstract
Diatoms greatly contribute to carbon fixation and thus strongly influence the global biogeochemical balance. Capable of chromatic acclimation (CA) to unfavourable light conditions, diatoms often dominate benthic ecosystems in addition to their planktonic lifestyle. Although CA has been studied at the molecular level, our understanding of this phenomenon remains incomplete. Here we provide new data to better explain the acclimation-associated changes under red-enhanced ambient light (RL) in diatom Phaeodactylum tricornutum, known to express a red-shifted antenna complex (F710). The complex was found to be an oligomer of a single polypeptide, Lhcf15. The steady-state spectroscopic properties of the oligomer were also studied. The oligomeric assembly of the Lhcf15 subunits is required for the complex to exhibit a red-shifted absorption. The presence of the red antenna in RL culture coincides with the development of a rounded phenotype of the diatom cell. A model summarizing the modulation of the photosynthetic apparatus during the acclimation response to light of different spectral quality is proposed. Our study suggests that toggling between alternative organizations of photosynthetic apparatus and distinct cell morphologies underlies the remarkable acclimation capacity of diatoms.
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Affiliation(s)
- Miroslava Herbstová
- Institute of Plant Molecular Biology, Biology Centre, Czech Academy of Sciences, Branišovská 31, 37005, České Budějovice, Czech Republic
| | - David Bína
- Institute of Plant Molecular Biology, Biology Centre, Czech Academy of Sciences, Branišovská 31, 37005, České Budějovice, Czech Republic
- Faculty of Science, University of South Bohemia, Branišovská 1760, 37005, České Budějovice, Czech Republic
| | - Radek Kaňa
- Faculty of Science, University of South Bohemia, Branišovská 1760, 37005, České Budějovice, Czech Republic
- Institute of Microbiology, Algatech Centre CAS, Opatovický mlýn, 379 81, Třeboň, Czech Republic
| | - František Vácha
- Institute of Plant Molecular Biology, Biology Centre, Czech Academy of Sciences, Branišovská 31, 37005, České Budějovice, Czech Republic
- Faculty of Science, University of South Bohemia, Branišovská 1760, 37005, České Budějovice, Czech Republic
| | - Radek Litvín
- Institute of Plant Molecular Biology, Biology Centre, Czech Academy of Sciences, Branišovská 31, 37005, České Budějovice, Czech Republic.
- Faculty of Science, University of South Bohemia, Branišovská 1760, 37005, České Budějovice, Czech Republic.
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Heydarizadeh P, Boureba W, Zahedi M, Huang B, Moreau B, Lukomska E, Couzinet-Mossion A, Wielgosz-Collin G, Martin-Jézéquel V, Bougaran G, Marchand J, Schoefs B. Response of CO 2-starved diatom Phaeodactylum tricornutum to light intensity transition. Philos Trans R Soc Lond B Biol Sci 2017; 372:20160396. [PMID: 28717022 PMCID: PMC5516105 DOI: 10.1098/rstb.2016.0396] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/01/2017] [Indexed: 12/13/2022] Open
Abstract
In this study, we investigated the responses of Phaeodactylum tricornutum cells acclimated to 300 µmol m-2 s-1 photon flux density to an increase (1000 µmol m-2 s-1) or decrease (30 µmol m-2 s-1) in photon flux densities. The light shift occurred abruptly after 5 days of growth and the acclimation to new conditions was followed during the next 6 days at the physiological and molecular levels. The molecular data reflect a rearrangement of carbon metabolism towards the production of phosphoenolpyruvic acid (PEP) and/or pyruvate. These intermediates were used differently by the cell as a function of the photon flux density: under low light, photosynthesis was depressed while respiration was increased. Under high light, lipids and proteins accumulated. Of great interest, under high light, the genes coding for the synthesis of aromatic amino acids and phenolic compounds were upregulated suggesting that the shikimate pathway was activated.This article is part of the themed issue 'The peculiar carbon metabolism in diatoms'.
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Affiliation(s)
- Parisa Heydarizadeh
- Metabolism, Bioengineering of Microalga Molecules and Applications (MIMMA), Mer Molécules Santé, UBL, IUML-FR 3473 CNRS, University of Le Mans, 72085 Le Mans, France
| | - Wafâa Boureba
- Metabolism, Bioengineering of Microalga Molecules and Applications (MIMMA), Mer Molécules Santé, UBL, IUML-FR 3473 CNRS, University of Le Mans, 72085 Le Mans, France
| | - Morteza Zahedi
- Department of Agronomy and Plant Breeding, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Bing Huang
- Metabolism, Bioengineering of Microalga Molecules and Applications (MIMMA), Mer Molécules Santé, UBL, IUML-FR 3473 CNRS, University of Le Mans, 72085 Le Mans, France
| | - Brigitte Moreau
- Metabolism, Bioengineering of Microalga Molecules and Applications (MIMMA), Mer Molécules Santé, UBL, IUML-FR 3473 CNRS, University of Le Mans, 72085 Le Mans, France
| | - Ewa Lukomska
- IFREMER, Physiology and Biotechnology of Algae Laboratory, rue de l'Ile d'Yeu, BP 21105, 44311 Nantes, France
| | - Aurélie Couzinet-Mossion
- Faculté des Sciences Pharmaceutiques et Biologiques, Université de Nantes, Groupe Mer, Molécules, Santé-EA 2160, Institut Universitaire Mer et Littoral FR3473 CNRS, 9 rue Bias, BP 61112, 44035 Nantes Cedex 1, France
| | - Gaëtane Wielgosz-Collin
- Faculté des Sciences Pharmaceutiques et Biologiques, Université de Nantes, Groupe Mer, Molécules, Santé-EA 2160, Institut Universitaire Mer et Littoral FR3473 CNRS, 9 rue Bias, BP 61112, 44035 Nantes Cedex 1, France
| | | | - Gaël Bougaran
- IFREMER, Physiology and Biotechnology of Algae Laboratory, rue de l'Ile d'Yeu, BP 21105, 44311 Nantes, France
| | - Justine Marchand
- Metabolism, Bioengineering of Microalga Molecules and Applications (MIMMA), Mer Molécules Santé, UBL, IUML-FR 3473 CNRS, University of Le Mans, 72085 Le Mans, France
| | - Benoît Schoefs
- Metabolism, Bioengineering of Microalga Molecules and Applications (MIMMA), Mer Molécules Santé, UBL, IUML-FR 3473 CNRS, University of Le Mans, 72085 Le Mans, France
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Jaubert M, Bouly JP, Ribera d'Alcalà M, Falciatore A. Light sensing and responses in marine microalgae. CURRENT OPINION IN PLANT BIOLOGY 2017; 37:70-77. [PMID: 28456112 DOI: 10.1016/j.pbi.2017.03.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 03/13/2017] [Indexed: 06/07/2023]
Abstract
Marine eukaryotic phytoplankton are major contributors to global primary production. To adapt and thrive in the oceans, phytoplankton relies on a variety of light-regulated responses and light-acclimation capacities probably driven by sophisticated photoregulatory mechanisms. A plethora of photoreceptor-like sequences from marine microalgae have been identified in omics approaches. Initial studies have revealed that some algal photoreceptors are similar to those known in plants. In addition, new variants with different spectral tuning and algal-specific light sensors have also been found, changing current views and perspectives on how photoreceptor structure and function have diversified in phototrophs experiencing different environmental conditions.
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Affiliation(s)
- Marianne Jaubert
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 4, Place de Jussieu, 75005 Paris, France
| | - Jean-Pierre Bouly
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 4, Place de Jussieu, 75005 Paris, France
| | - Maurizio Ribera d'Alcalà
- Stazione Zoologica Anton Dohrn, Laboratory of Ecology and Evolution of Plankton, Villa Comunale, 80121 Naples, Italy.
| | - Angela Falciatore
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 4, Place de Jussieu, 75005 Paris, France.
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Lepetit B, Gélin G, Lepetit M, Sturm S, Vugrinec S, Rogato A, Kroth PG, Falciatore A, Lavaud J. The diatom Phaeodactylum tricornutum adjusts nonphotochemical fluorescence quenching capacity in response to dynamic light via fine-tuned Lhcx and xanthophyll cycle pigment synthesis. THE NEW PHYTOLOGIST 2017; 214:205-218. [PMID: 27870063 DOI: 10.1111/nph.14337] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 10/17/2016] [Indexed: 05/24/2023]
Abstract
Diatoms contain a highly flexible capacity to dissipate excessively absorbed light by nonphotochemical fluorescence quenching (NPQ) based on the light-induced conversion of diadinoxanthin (Dd) into diatoxanthin (Dt) and the presence of Lhcx proteins. Their NPQ fine regulation on the molecular level upon a shift to dynamic light conditions is unknown. We investigated the regulation of Dd + Dt amount, Lhcx gene and protein synthesis and NPQ capacity in the diatom Phaeodactylum tricornutum after a change from continuous low light to 3 d of sine (SL) or fluctuating (FL) light conditions. Four P. tricornutum strains with different NPQ capacities due to different expression of Lhcx1 were included. All strains responded to dynamic light comparably, independently of initial NPQ capacity. During SL, NPQ capacity was strongly enhanced due to a gradual increase of Lhcx2 and Dd + Dt amount. During FL, cells enhanced their NPQ capacity on the first day due to increased Dd + Dt, Lhcx2 and Lhcx3; already by the second day light acclimation was accomplished. While quenching efficiency of Dt was strongly lowered during SL conditions, it remained high throughout the whole FL exposure. Our results highlight a more balanced and cost-effective photoacclimation strategy of P. tricornutum under FL than under SL conditions.
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Affiliation(s)
- Bernard Lepetit
- UMR7266 'LIENSs', CNRS Université de La Rochelle, Institut du Littoral et de l'Environnement, 2 rue Olympe de Gouges, La Rochelle, 17000, France
- Zukunftskolleg, Pflanzliche Ökophysiologie, Universität Konstanz, Konstanz, 78457, Germany
| | - Gautier Gélin
- UMR7266 'LIENSs', CNRS Université de La Rochelle, Institut du Littoral et de l'Environnement, 2 rue Olympe de Gouges, La Rochelle, 17000, France
| | - Mariana Lepetit
- UMR7266 'LIENSs', CNRS Université de La Rochelle, Institut du Littoral et de l'Environnement, 2 rue Olympe de Gouges, La Rochelle, 17000, France
| | - Sabine Sturm
- Zukunftskolleg, Pflanzliche Ökophysiologie, Universität Konstanz, Konstanz, 78457, Germany
| | - Sascha Vugrinec
- Zukunftskolleg, Pflanzliche Ökophysiologie, Universität Konstanz, Konstanz, 78457, Germany
| | - Alessandra Rogato
- Institute of Biosciences and BioResources, CNR, Via P. Castellino 111, Naples, 80131, Italy
- Stazione Zoologica Anton Dohrn Villa Comunale, Naples, 80121, Italy
| | - Peter G Kroth
- Zukunftskolleg, Pflanzliche Ökophysiologie, Universität Konstanz, Konstanz, 78457, Germany
| | - Angela Falciatore
- Laboratoire de Biologie Computationnelle et Quantitative, Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, 15 rue de l'Ecole de Médecine, Paris, 75006, France
| | - Johann Lavaud
- UMR7266 'LIENSs', CNRS Université de La Rochelle, Institut du Littoral et de l'Environnement, 2 rue Olympe de Gouges, La Rochelle, 17000, France
- Département de Biologie, UMI 3376 TAKUVIK, CNRS/Université Laval, Pavillon Alexandre-Vachon, 1045 avenue de la Médecine, Québec, QC, G1V 0A6, Canada
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Dolch LJ, Rak C, Perin G, Tourcier G, Broughton R, Leterrier M, Morosinotto T, Tellier F, Faure JD, Falconet D, Jouhet J, Sayanova O, Beaudoin F, Maréchal E. A Palmitic Acid Elongase Affects Eicosapentaenoic Acid and Plastidial Monogalactosyldiacylglycerol Levels in Nannochloropsis. PLANT PHYSIOLOGY 2017; 173:742-759. [PMID: 27895203 PMCID: PMC5210741 DOI: 10.1104/pp.16.01420] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 11/24/2016] [Indexed: 05/03/2023]
Abstract
Nannochloropsis species are oleaginous eukaryotes containing a plastid limited by four membranes, deriving from a secondary endosymbiosis. In Nannochloropsis, thylakoid lipids, including monogalactosyldiacylglycerol (MGDG), are enriched in eicosapentaenoic acid (EPA). The need for EPA in MGDG is not understood. Fatty acids are de novo synthesized in the stroma, then converted into very-long-chain polyunsaturated fatty acids (FAs) at the endoplasmic reticulum (ER). The production of MGDG relies therefore on an EPA supply from the ER to the plastid, following an unknown process. We identified seven elongases and five desaturases possibly involved in EPA production in Nannochloropsis gaditana Among the six heterokont-specific saturated FA elongases possibly acting upstream in this pathway, we characterized the highly expressed isoform Δ0-ELO1 Heterologous expression in yeast (Saccharomyces cerevisiae) showed that NgΔ0-ELO1 could elongate palmitic acid. Nannochloropsis Δ0-elo1 mutants exhibited a reduced EPA level and a specific decrease in MGDG In NgΔ0-elo1 lines, the impairment of photosynthesis is consistent with a role of EPA-rich MGDG in nonphotochemical quenching control, possibly providing an appropriate MGDG platform for the xanthophyll cycle. Concomitantly with MGDG decrease, the level of triacylglycerol (TAG) containing medium chain FAs increased. In Nannochloropsis, part of EPA used for MGDG production is therefore biosynthesized by a channeled process initiated at the elongation step of palmitic acid by Δ0-ELO1, thus acting as a committing enzyme for galactolipid production. Based on the MGDG/TAG balance controlled by Δ0-ELO1, this study also provides novel prospects for the engineering of oleaginous microalgae for biotechnological applications.
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Affiliation(s)
- Lina-Juana Dolch
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.)
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.);
| | - Camille Rak
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.)
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.);
| | - Giorgio Perin
- Padua Algae Research Laboratory, Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy (G.P., T.M.)
- Padua Algae Research Laboratory, Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy (G.P., T.M.);
| | - Guillaume Tourcier
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.)
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.);
| | - Richard Broughton
- Biological Chemistry and Crop Protection Department, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, United Kingdom (R.B., O.S., F.B.)
- Biological Chemistry and Crop Protection Department, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, United Kingdom (R.B., O.S., F.B.);
| | - Marina Leterrier
- Fermentalg, 4 Rue Rivière, 33500, Libourne, France (M.L.); and
- Fermentalg, 4 Rue Rivière, 33500, Libourne, France (M.L.); and
| | - Tomas Morosinotto
- Padua Algae Research Laboratory, Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy (G.P., T.M.)
- Padua Algae Research Laboratory, Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy (G.P., T.M.);
| | - Frédérique Tellier
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.)
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, France (J.-D.F.)
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, France (J.-D.F.)
| | - Jean-Denis Faure
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, France (J.-D.F.)
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, 78000, Versailles, France (J.-D.F.)
| | - Denis Falconet
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.)
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.);
| | - Juliette Jouhet
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.)
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.);
| | - Olga Sayanova
- Biological Chemistry and Crop Protection Department, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, United Kingdom (R.B., O.S., F.B.)
- Biological Chemistry and Crop Protection Department, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, United Kingdom (R.B., O.S., F.B.);
| | - Frédéric Beaudoin
- Biological Chemistry and Crop Protection Department, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, United Kingdom (R.B., O.S., F.B.)
- Biological Chemistry and Crop Protection Department, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, United Kingdom (R.B., O.S., F.B.);
| | - Eric Maréchal
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.)
- Laboratoire de Physiologie Cellulaire et Végétale, Unité mixte de recherche 5168 CNRS - CEA - Université Grenoble 1, Institut de Recherche en Sciences et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cedex 9, France (L.-J.D., C.R., G.T., D.F., J.J., E.M.);
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Vadiveloo A, Moheimani N, Kosterink NR, Cosgrove J, Parlevliet D, Gonzalez-Garcia C, Lubián LM. Photosynthetic performance of two Nannochloropsis spp. under different filtered light spectra. ALGAL RES 2016. [DOI: 10.1016/j.algal.2016.08.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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40
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Chu L, Ewe D, Río Bártulos C, Kroth PG, Gruber A. Rapid induction of GFP expression by the nitrate reductase promoter in the diatom Phaeodactylum tricornutum. PeerJ 2016; 4:e2344. [PMID: 27635322 PMCID: PMC5012323 DOI: 10.7717/peerj.2344] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 07/19/2016] [Indexed: 02/06/2023] Open
Abstract
An essential prerequisite for a controlled transgene expression is the choice of a suitable promoter. In the model diatom Phaeodactylum tricornutum, the most commonly used promoters for trans-gene expression are the light dependent lhcf1 promoters (derived from two endogenous genes encoding fucoxanthin chlorophyll a/c binding proteins) and the nitrate dependent nr promoter (derived from the endogenous nitrate reductase gene). In this study, we investigated the time dependent expression of the green fluorescent protein (GFP) reporter under control of the nitrate reductase promoter in independently genetically transformed P. tricornutum cell lines following induction of expression by change of the nitrogen source in the medium via flow cytometry, microscopy and western blotting. In all investigated cell lines, GFP fluorescence started to increase 1 h after change of the medium, the fastest increase rates were observed between 2 and 3 h. Fluorescence continued to increase slightly for up to 7 h even after transfer of the cells to ammonium medium. The subsequent decrease of GFP fluorescence was much slower than the increase, probably due to the stability of GFP. The investigation of several cell lines transformed with nr based constructs revealed that, also in the absence of nitrate, the promoter may show residual activity. Furthermore, we observed a strong variation of gene expression between independent cell lines, emphasising the importance of a thorough characterisation of genetically modified cell lines and their individual expression patterns.
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Affiliation(s)
- Lili Chu
- Fachbereich Biologie, Universität Konstanz , Konstanz , Germany
| | - Daniela Ewe
- Fachbereich Biologie, Universität Konstanz, Konstanz, Germany; Current affiliation: Centre Algatech, Institute of Microbiology, The Czech Academy of Science, Třeboň, Czech Republic
| | | | - Peter G Kroth
- Fachbereich Biologie, Universität Konstanz , Konstanz , Germany
| | - Ansgar Gruber
- Fachbereich Biologie, Universität Konstanz , Konstanz , Germany
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Hunsperger HM, Ford CJ, Miller JS, Cattolico RA. Differential Regulation of Duplicate Light-Dependent Protochlorophyllide Oxidoreductases in the Diatom Phaeodactylum tricornutum. PLoS One 2016; 11:e0158614. [PMID: 27367227 PMCID: PMC4930169 DOI: 10.1371/journal.pone.0158614] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 06/17/2016] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Diatoms (Bacilliariophyceae) encode two light-dependent protochlorophyllide oxidoreductases (POR1 and POR2) that catalyze the penultimate step of chlorophyll biosynthesis in the light. Algae live in dynamic environments whose changing light levels induce photoacclimative metabolic shifts, including altered cellular chlorophyll levels. We hypothesized that the two POR proteins may be differentially adaptive under varying light conditions. Using the diatom Phaeodactylum tricornutum as a test system, differences in POR protein abundance and por gene expression were examined when this organism was grown on an alternating light:dark cycles at different irradiances; exposed to continuous light; and challenged by a significant decrease in light availability. RESULTS For cultures maintained on a 12h light: 12h dark photoperiod at 200μE m-2 s-1 (200L/D), both por genes were up-regulated during the light and down-regulated in the dark, though por1 transcript abundance rose and fell earlier than that of por2. Little concordance occurred between por1 mRNA and POR1 protein abundance. In contrast, por2 mRNA and POR2 protein abundances followed similar diurnal patterns. When 200L/D P. tricornutum cultures were transferred to continuous light (200L/L), the diurnal regulatory pattern of por1 mRNA abundance but not of por2 was disrupted, and POR1 but not POR2 protein abundance dropped steeply. Under 1200μE m-2 s-1 (1200L/D), both por1 mRNA and POR1 protein abundance displayed diurnal oscillations. A compromised diel por2 mRNA response under 1200L/D did not impact the oscillation in POR2 abundance. When cells grown at 1200L/D were then shifted to 50μE m-2 s-1 (50L/D), por1 and por2 mRNA levels decreased swiftly but briefly upon light reduction. Thereafter, POR1 but not POR2 protein levels rose significantly in response to this light stepdown. CONCLUSION Given the sensitivity of diatom por1/POR1 to real-time light cues and adherence of por2/POR2 regulation to the diurnal cycle, we suggest that POR1 supports photoacclimation, whereas POR2 is the workhorse for daily chlorophyll synthesis.
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Affiliation(s)
- Heather M. Hunsperger
- Department of Biology, University of Washington, Seattle, Washington, United States of America
| | - Christopher J. Ford
- Department of Biology, University of Washington, Seattle, Washington, United States of America
| | - James S. Miller
- Department of Biology, University of Washington, Seattle, Washington, United States of America
| | - Rose Ann Cattolico
- Department of Biology, University of Washington, Seattle, Washington, United States of America
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Taddei L, Stella GR, Rogato A, Bailleul B, Fortunato AE, Annunziata R, Sanges R, Thaler M, Lepetit B, Lavaud J, Jaubert M, Finazzi G, Bouly JP, Falciatore A. Multisignal control of expression of the LHCX protein family in the marine diatom Phaeodactylum tricornutum. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:3939-51. [PMID: 27225826 PMCID: PMC4915529 DOI: 10.1093/jxb/erw198] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Diatoms are phytoplanktonic organisms that grow successfully in the ocean where light conditions are highly variable. Studies of the molecular mechanisms of light acclimation in the marine diatom Phaeodactylum tricornutum show that carotenoid de-epoxidation enzymes and LHCX1, a member of the light-harvesting protein family, both contribute to dissipate excess light energy through non-photochemical quenching (NPQ). In this study, we investigate the role of the other members of the LHCX family in diatom stress responses. Our analysis of available genomic data shows that the presence of multiple LHCX genes is a conserved feature of diatom species living in different ecological niches. Moreover, an analysis of the levels of four P. tricornutum LHCX transcripts in relation to protein expression and photosynthetic activity indicates that LHCXs are differentially regulated under different light intensities and nutrient starvation, mostly modulating NPQ capacity. We conclude that multiple abiotic stress signals converge to regulate the LHCX content of cells, providing a way to fine-tune light harvesting and photoprotection. Moreover, our data indicate that the expansion of the LHCX gene family reflects functional diversification of its members which could benefit cells responding to highly variable ocean environments.
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Affiliation(s)
- Lucilla Taddei
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Giulio Rocco Stella
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 15 rue de l'Ecole de Médecine, 75006 Paris, France Department of Biotechnology, University of Verona, Strada Le Grazie, I-37134 Verona, Italy
| | - Alessandra Rogato
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 15 rue de l'Ecole de Médecine, 75006 Paris, France Institute of Biosciences and BioResources, CNR, Via P. Castellino 111, 80131 Naples, Italy Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
| | - Benjamin Bailleul
- Institut de Biologie Physico-Chimique, UMR 7141 CNRS-UPMC, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Antonio Emidio Fortunato
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Rossella Annunziata
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Remo Sanges
- Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
| | - Michael Thaler
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Bernard Lepetit
- Zukunftskolleg, Department of Plant Ecophysiology, University of Konstanz, D-78457 Konstanz, Germany
| | - Johann Lavaud
- UMI 3376 TAKUVIK, CNRS/Université Laval, Département de Biologie, Pavillon Alexandre-Vachon, 1045 avenue de la Médecine, Québec (Québec) G1V 0A6, Canada
| | - Marianne Jaubert
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Giovanni Finazzi
- Laboratoire de Physiologie Cellulaire et Végétale, UMR 5168, Centre National de la Recherche Scientifique (CNRS), Institut National Recherche Agronomique (INRA), Université Grenoble Alpes, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), Institut de Biosciences et Biotechnologies de Grenoble, (BIG), CEA Grenoble, F-38054 Grenoble cedex 9, France
| | - Jean-Pierre Bouly
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Angela Falciatore
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative, 15 rue de l'Ecole de Médecine, 75006 Paris, France
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Ashworth J, Turkarslan S, Harris M, Orellana MV, Baliga NS. Pan-transcriptomic analysis identifies coordinated and orthologous functional modules in the diatoms Thalassiosira pseudonana and Phaeodactylum tricornutum. Mar Genomics 2016; 26:21-8. [DOI: 10.1016/j.margen.2015.10.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 10/28/2015] [Accepted: 10/29/2015] [Indexed: 01/01/2023]
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Hewes CD. The color of mass culture: spectral characteristics of a shallow water column through shade-limited algal growth dynamics(1). JOURNAL OF PHYCOLOGY 2016; 52:252-259. [PMID: 27037590 DOI: 10.1111/jpy.12393] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 01/15/2016] [Indexed: 06/05/2023]
Abstract
It is envisioned that mass algal cultivation for commercial biofuels production will entail the use of large raceway pond systems, which typically have shade-limited photosynthetic growth within depths of 20-30 cm. The attenuation of light and spectral qualities of red, green, and blue wavelengths in a 20-cm water column as a function of Chl-a concentration during exponential and linear phases of growth dynamics for the marine diatom Thalassiosira pseudonana was examined under laboratory conditions. While photosynthetically available radiation (PAR) was in excess throughout the water column during the phase of exponential growth, PAR became rate limiting differently for red, green, and blue wavelengths during the phase of linear growth. The transition from exponential to linear growth occurred at 1-2 mg Chl-a · L-1, whereby a scalar ~5 μmol photons · m-2 · s-1 at 20-cm depth was found to occur as would be anticipated having the compensation point for where rates of photosynthesis and respiration are equal. During the phase of linear growth, red wavelengths became increasingly dominant at depth as Chl-a concentrations increased, being contrary to the optical conditions for those natural bodies of water that forced the evolution of phytoplankton photosynthesis. It is hypothesized this dramatic difference in water column optics between natural and synthetic environments could influence a variety of biological reactions, importantly non-photochemical quenching capacities, which could negatively impact crop yield.
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Affiliation(s)
- Christopher D Hewes
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, 92093-0202, USA
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45
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Fortunato AE, Jaubert M, Enomoto G, Bouly JP, Raniello R, Thaler M, Malviya S, Bernardes JS, Rappaport F, Gentili B, Huysman MJJ, Carbone A, Bowler C, d'Alcalà MR, Ikeuchi M, Falciatore A. Diatom Phytochromes Reveal the Existence of Far-Red-Light-Based Sensing in the Ocean. THE PLANT CELL 2016; 28:616-28. [PMID: 26941092 PMCID: PMC4826011 DOI: 10.1105/tpc.15.00928] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 02/16/2016] [Accepted: 02/29/2016] [Indexed: 05/22/2023]
Abstract
The absorption of visible light in aquatic environments has led to the common assumption that aquatic organisms sense and adapt to penetrative blue/green light wavelengths but show little or no response to the more attenuated red/far-red wavelengths. Here, we show that two marine diatom species, Phaeodactylum tricornutum and Thalassiosira pseudonana, possess a bona fide red/far-red light sensing phytochrome (DPH) that uses biliverdin as a chromophore and displays accentuated red-shifted absorbance peaks compared with other characterized plant and algal phytochromes. Exposure to both red and far-red light causes changes in gene expression in P. tricornutum, and the responses to far-red light disappear in DPH knockout cells, demonstrating that P. tricornutum DPH mediates far-red light signaling. The identification of DPH genes in diverse diatom species widely distributed along the water column further emphasizes the ecological significance of far-red light sensing, raising questions about the sources of far-red light. Our analyses indicate that, although far-red wavelengths from sunlight are only detectable at the ocean surface, chlorophyll fluorescence and Raman scattering can generate red/far-red photons in deeper layers. This study opens up novel perspectives on phytochrome-mediated far-red light signaling in the ocean and on the light sensing and adaptive capabilities of marine phototrophs.
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Affiliation(s)
- Antonio Emidio Fortunato
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative UMR 7238, 75006 Paris, France
| | - Marianne Jaubert
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative UMR 7238, 75006 Paris, France
| | - Gen Enomoto
- Department of Life Sciences (Biology), Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo 153-8902, Japan
| | - Jean-Pierre Bouly
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative UMR 7238, 75006 Paris, France
| | | | - Michael Thaler
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative UMR 7238, 75006 Paris, France
| | - Shruti Malviya
- Ecole Normale Supérieure, PSL Research University, Institut de Biologie de l'Ecole Normale Supérieure, CNRS UMR 8197, INSERM U1024, F-75005 Paris, France
| | - Juliana Silva Bernardes
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative UMR 7238, 75006 Paris, France
| | - Fabrice Rappaport
- Institut de Biologie Physico-Chimique, UMR 7141 CNRS-UPMC, 75005 Paris, France
| | - Bernard Gentili
- Sorbonne Universités, UPMC Univ-Paris 6, CNRS, UMR 7093, Laboratoire d'Océanologie de Villefranche, F-06230 Villefranche/mer, France
| | - Marie J J Huysman
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, B-9000 Gent, Belgium Department of Plant Systems Biology, VIB, B-9052 Gent, Belgium Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052 Gent, Belgium
| | - Alessandra Carbone
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative UMR 7238, 75006 Paris, France Institut Universitaire de France, 75005 Paris, France
| | - Chris Bowler
- Ecole Normale Supérieure, PSL Research University, Institut de Biologie de l'Ecole Normale Supérieure, CNRS UMR 8197, INSERM U1024, F-75005 Paris, France
| | | | - Masahiko Ikeuchi
- Department of Life Sciences (Biology), Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo 153-8902, Japan
| | - Angela Falciatore
- Sorbonne Universités, UPMC, Institut de Biologie Paris-Seine, CNRS, Laboratoire de Biologie Computationnelle et Quantitative UMR 7238, 75006 Paris, France
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46
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Rodríguez F, Garrido JL, Sobrino C, Johnsen G, Riobó P, Franco J, Aamot I, Ramilo I, Sanz N, Kremp A. Divinyl chlorophyll a in the marine eukaryotic protist Alexandrium ostenfeldii (Dinophyceae). Environ Microbiol 2015; 18:627-43. [PMID: 26337730 DOI: 10.1111/1462-2920.13042] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 08/26/2015] [Accepted: 08/27/2015] [Indexed: 02/01/2023]
Abstract
Here it is reported the first detection of DV-chl a together with the usual chl a in the marine dinoflagellate Alexandrium ostenfeldii from the Baltic Sea. Growth response and photosynthetic parameters were examined at two irradiances (80 and 240 μmol photons m(-2) s(-1)) and temperatures (15 °C and 19 °C) in a divinylic strain (AOTV-OS20) versus a monovinylic one (AOTV-OS16), using in vivo chl a fluorescence kinetics of PSII to characterize photosynthetic parameters by pulse amplitude modulated fluorescence, (14)C assimilation rates and toxin analyses. The divinylic isolate exhibited slower growth and stronger sensitivity to high irradiance than normal chl a strain. DV-chl a : chl a ratios decreased along time (from 11.3 to < 0.5 after 10 months) and to restore them sub-cloning and selection of strains with highest DV-chl a content was required. A mutation and/or epigenetic changes in the expression of divinyl reductase gene/s in A. ostenfeldii may explain this altered pigment composition. Despite quite severe limitations (reduced fitness and gradual loss of DV-chl a content), the DV-chl a-containing line in A. ostenfeldii could provide a model organism in photosynthetic studies related with chl biosynthesis and evolution.
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Affiliation(s)
- Francisco Rodríguez
- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Vigo, Spain
| | | | - Cristina Sobrino
- Departamento de Ecología y Biología Animal, Universidad de Vigo, Spain
| | - Geir Johnsen
- Trondhjem Biological Station, Norwegian University of Technology and Science (NTNU), Trondheim, Norway
| | - Pilar Riobó
- Instituto de Investigaciones Marinas (CSIC), Vigo, Spain
| | - José Franco
- Instituto de Investigaciones Marinas (CSIC), Vigo, Spain
| | - Inga Aamot
- Trondhjem Biological Station, Norwegian University of Technology and Science (NTNU), Trondheim, Norway
| | - Isabel Ramilo
- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Vigo, Spain
| | - Noelia Sanz
- Instituto de Investigaciones Marinas (CSIC), Vigo, Spain
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute, Helsinki, Finland
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47
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Cohen JH, Berge J, Moline MA, Sørensen AJ, Last K, Falk-Petersen S, Renaud PE, Leu ES, Grenvald J, Cottier F, Cronin H, Menze S, Norgren P, Varpe Ø, Daase M, Darnis G, Johnsen G. Is Ambient Light during the High Arctic Polar Night Sufficient to Act as a Visual Cue for Zooplankton? PLoS One 2015; 10:e0126247. [PMID: 26039111 PMCID: PMC4454649 DOI: 10.1371/journal.pone.0126247] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Accepted: 03/30/2015] [Indexed: 11/19/2022] Open
Abstract
The light regime is an ecologically important factor in pelagic habitats, influencing a range of biological processes. However, the availability and importance of light to these processes in high Arctic zooplankton communities during periods of 'complete' darkness (polar night) are poorly studied. Here we characterized the ambient light regime throughout the diel cycle during the high Arctic polar night, and ask whether visual systems of Arctic zooplankton can detect the low levels of irradiance available at this time. To this end, light measurements with a purpose-built irradiance sensor and coupled all-sky digital photographs were used to characterize diel skylight irradiance patterns over 24 hours at 79°N in January 2014 and 2015. Subsequent skylight spectral irradiance and in-water optical property measurements were used to model the underwater light field as a function of depth, which was then weighted by the electrophysiologically determined visual spectral sensitivity of a dominant high Arctic zooplankter, Thysanoessa inermis. Irradiance in air ranged between 1–1.5 x 10-5μmol photons m-2 s-1 (400–700 nm) in clear weather conditions at noon and with the moon below the horizon, hence values reflect only solar illumination. Radiative transfer modelling generated underwater light fields with peak transmission at blue-green wavelengths, with a 465 nm transmission maximum in shallow water shifting to 485 nm with depth. To the eye of a zooplankter, light from the surface to 75 m exhibits a maximum at 485 nm, with longer wavelengths (>600 nm) being of little visual significance. Our data are the first quantitative characterisation, including absolute intensities, spectral composition and photoperiod of biologically relevant solar ambient light in the high Arctic during the polar night, and indicate that some species of Arctic zooplankton are able to detect and utilize ambient light down to 20–30m depth during the Arctic polar night.
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Affiliation(s)
- Jonathan H. Cohen
- University of Delaware, School of Marine Science & Policy, 700 Pilottown Rd., Lewes, Delaware, United States of America
| | - Jørgen Berge
- The University Centre in Svalbard, 9171, Longyearbyen, Norway
- Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, 9037, Tromsø, Norway
- * E-mail:
| | - Mark A. Moline
- University of Delaware, School of Marine Science & Policy, 700 Pilottown Rd., Lewes, Delaware, United States of America
| | - Asgeir J. Sørensen
- Applied Underwater Robotics Lab, Depts of Biology and Marine Technology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
| | - Kim Last
- Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll PA37 1QA, Scotland, United Kingdom
| | - Stig Falk-Petersen
- Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, 9037, Tromsø, Norway
- Akvaplan-niva A/S, Fram Centre, 9296, Tromsø, Norway
| | - Paul E. Renaud
- The University Centre in Svalbard, 9171, Longyearbyen, Norway
- Akvaplan-niva A/S, Fram Centre, 9296, Tromsø, Norway
| | - Eva S. Leu
- Akvaplan-niva A/S, Fram Centre, 9296, Tromsø, Norway
| | - Julie Grenvald
- The University Centre in Svalbard, 9171, Longyearbyen, Norway
- Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, 9037, Tromsø, Norway
| | - Finlo Cottier
- Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll PA37 1QA, Scotland, United Kingdom
| | - Heather Cronin
- The University Centre in Svalbard, 9171, Longyearbyen, Norway
- University of Delaware, School of Marine Science & Policy, 700 Pilottown Rd., Lewes, Delaware, United States of America
| | - Sebastian Menze
- The University Centre in Svalbard, 9171, Longyearbyen, Norway
| | - Petter Norgren
- Applied Underwater Robotics Lab, Depts of Biology and Marine Technology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
| | - Øystein Varpe
- The University Centre in Svalbard, 9171, Longyearbyen, Norway
- Akvaplan-niva A/S, Fram Centre, 9296, Tromsø, Norway
| | - Malin Daase
- Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, 9037, Tromsø, Norway
| | - Gerald Darnis
- Akvaplan-niva A/S, Fram Centre, 9296, Tromsø, Norway
| | - Geir Johnsen
- The University Centre in Svalbard, 9171, Longyearbyen, Norway
- Applied Underwater Robotics Lab, Depts of Biology and Marine Technology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
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