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Zerbini M, Solari PL, Orange F, Jeanson A, Leblanc C, Gomari M, Auwer CD, Beccia MR. Exploring uranium bioaccumulation in the brown alga Ascophyllum nodosum: insights from multi-scale spectroscopy and imaging. Sci Rep 2024; 14:1021. [PMID: 38200072 PMCID: PMC10781969 DOI: 10.1038/s41598-023-49293-w] [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: 05/09/2023] [Accepted: 12/06/2023] [Indexed: 01/12/2024] Open
Abstract
Legacy radioactive waste can be defined as the radioactive waste produced during the infancy of the civil nuclear industry's development in the mid-20th Century, a time when, unfortunately, waste storage and treatment were not well planned. The marine environment is one of the environmental compartments worth studying in this regard because of legacy waste in specific locations of the seabed. Comprising nearly 70% of the earth's service, the oceans are the largest and indeed the final destination for contaminated fresh waters. For this reason, long-term studies of the accumulation biochemical mechanisms of metallic radionuclides in the marine ecosystem are required. In this context the brown algal compartment may be ecologically relevant because of forming large and dense algal beds in coastal areas and potential important biomass for contamination. This report presents the first step in the investigation of uranium (U, an element used in the nuclear cycle) bioaccumulation in the brown alga Ascophyllum nodosum using a multi-scale spectroscopic and imaging approach. Contamination of A. nodosum specimens in closed aquaria at 13 °C was performed with a defined quantity of U(VI) (10-5 M). The living algal uptake was quantified by ICP-MS and a localization study in the various algal compartments was carried out by combining electronic microscopy imaging (SEM), X-ray Absorption spectroscopy (XAS) and micro X-ray Florescence (μ-XRF). Data indicate that the brown alga is able to concentrate U(VI) by an active bioaccumulation mechanism, reaching an equilibrium state after 200 h of daily contamination. A comparison between living organisms and dry biomass confirms a stress-response process in the former, with an average bioaccumulation factor (BAF) of 10 ± 2 for living specimens (90% lower compared to dry biomass, 142 ± 5). Also, these results open new perspectives for a potential use of A. nodosum dry biomass as uranium biosorbent. The different partial BAFs (bioaccumulation factors) range from 3 (for thallus) to 49 (for receptacles) leading to a compartmentalization of uranium within the seaweed. This reveals a higher accumulation capacity in the receptacles, the algal reproductive parts. SEM images highlight the different tissue distributions among the compartments with a superficial absorption in the thallus and lateral branches and several hotspots in the oospheres of the female individuals. A preliminary speciation XAS analysis identified a distinct U speciation in the gametes-containing receptacles as a pseudo-autunite phosphate phase. Similarly, XAS measurements on the lateral branches (XANES) were not conclusive with regards to the occurrence of an alginate-U complex in these tissues. Nonetheless, the hypothesis that alginate may play a role in the speciation of U in the algal thallus tissues is still under consideration.
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Affiliation(s)
- Micol Zerbini
- Institut de Chimie de Nice, UMR 7272, Université Côte d'Azur, CNRS, 06108, Nice, France
| | - Pier Lorenzo Solari
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190, Saint-Aubin, France
| | - Francois Orange
- Université Côte d'Azur, Centre Commun de Microscopie Appliquée, 06108, Nice, France
| | - Aurélie Jeanson
- Institut de Chimie de Nice, UMR 7272, Université Côte d'Azur, CNRS, 06108, Nice, France
| | - Catherine Leblanc
- Station Biologique de Roscoff, UMR 8227, Sorbonne Université, CNRS, 29680, Roscoff, France
| | - Myriam Gomari
- Institut de Chimie de Nice, UMR 7272, Université Côte d'Azur, CNRS, 06108, Nice, France
| | - Christophe Den Auwer
- Institut de Chimie de Nice, UMR 7272, Université Côte d'Azur, CNRS, 06108, Nice, France
| | - Maria Rosa Beccia
- Institut de Chimie de Nice, UMR 7272, Université Côte d'Azur, CNRS, 06108, Nice, France.
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Lee ZJ, Xie C, Ng K, Suleria HAR. Unraveling the bioactive interplay: seaweed polysaccharide, polyphenol and their gut modulation effect. Crit Rev Food Sci Nutr 2023:1-24. [PMID: 37991467 DOI: 10.1080/10408398.2023.2274453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Seaweed is rich in many unique bioactive compounds such as polyphenols and sulfated polysaccharides that are not found in terrestrial plant. The discovery of numerous biological activities from seaweed has made seaweed an attractive functional food source with the potential to be exploited for human health benefits. During food processing and digestion, cell wall polysaccharide and polyphenols commonly interact, and this may influence the nutritional properties of food. Interactions between cell wall polysaccharide and polyphenols in plant-based system has been extensively studied. However, similar interactions in seaweed have received little attention despite the vast disparity between the structural and chemical composition of plant and seaweed cell wall. This poses a challenge in extracting seaweed bioactive compounds with intact biological properties. This review aims to summarize the cell wall polysaccharide and polyphenols present in brown, red and green seaweed, and current knowledge on their potential interactions. Moreover, this review gives an overview of the gut modulation effect of seaweed polysaccharide and polyphenol.
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Affiliation(s)
- Zu Jia Lee
- School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, Australia
| | - Cundong Xie
- School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, Australia
| | - Ken Ng
- School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, Australia
| | - Hafiz A R Suleria
- School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, Australia
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Kinnby A, Cervin G, Larsson AI, Edlund U, Toth GB, Pavia H. Ocean acidification reduces thallus strength in a non-calcifying foundation seaweed. Curr Biol 2023; 33:R941-R942. [PMID: 37751702 DOI: 10.1016/j.cub.2023.07.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 09/28/2023]
Abstract
Climate change is causing unprecedented changes in terrestrial and aquatic ecosystems through the emission of greenhouse gases, including carbon dioxide (CO2). Approximately 30% of CO2 is taken up by the ocean ('ocean acidification', OA)1, which has profound effects on foundation seaweed species. Negative physical effects on calcifying algae are clear2, but studies on habitat-forming fleshy seaweeds have mainly focused on growth and less on thallus strength3,4. We exposed the habitat-forming brown seaweed Fucus vesiculosus to OA corresponding to projected climate change effects for the year 2100, and observed reduced apical thallus strength and greater loss of exposed individuals in the field. The tissue contained less calcium and magnesium, both of which are important for creating structural alginate matrices. Scanning electron microscopy (SEM) revealed tissue voids in the OA samples that were not present in seaweeds grown under ambient pCO2. We conclude that under OA, weakened F. vesiculosus will be at a significantly higher risk of physical damage and detachment.
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Affiliation(s)
- Alexandra Kinnby
- Tjärnö Marine Laboratory, Department of Marine Sciences, University of Gothenburg, SE-452 96 Strömstad, Sweden.
| | - Gunnar Cervin
- Tjärnö Marine Laboratory, Department of Marine Sciences, University of Gothenburg, SE-452 96 Strömstad, Sweden
| | - Ann I Larsson
- Tjärnö Marine Laboratory, Department of Marine Sciences, University of Gothenburg, SE-452 96 Strömstad, Sweden
| | - Ulrica Edlund
- Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
| | - Gunilla B Toth
- Tjärnö Marine Laboratory, Department of Marine Sciences, University of Gothenburg, SE-452 96 Strömstad, Sweden
| | - Henrik Pavia
- Tjärnö Marine Laboratory, Department of Marine Sciences, University of Gothenburg, SE-452 96 Strömstad, Sweden
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4
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Gonzalez ST, Alberto F, Molano G. Whole-genome sequencing distinguishes the two most common giant kelp ecomorphs. Evolution 2023; 77:1354-1369. [PMID: 36929706 DOI: 10.1093/evolut/qpad045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 02/14/2023] [Accepted: 03/23/2023] [Indexed: 03/18/2023]
Abstract
Giant kelp, Macrocystis pyrifera, exists as distinct morphological variants-or "ecomorphs"-in different populations, yet the mechanism for this variation is uncertain, and environmental drivers for either adaptive or plastic phenotypes have not been identified. The ecomorphs Macrocystis "pyrifera" and M. "integrifolia" are distributed throughout temperate waters of North and South America with almost no geographic overlap and exhibit an incongruous, non-mirrored, distribution across the equator. This study evaluates the degree of genetic divergence between M. "pyrifera" and M. "integrifolia" across 18 populations in Chile and California using whole-genome sequencing and single-nucleotide polymorphism markers. Our results based on a principal component analysis, admixture clustering by genetic similarity, and phylogenetic inference demonstrate that M. "pyrifera" and M. "integrifolia" are genetically distinguishable. Analyses reveal separation by Northern and Southern Hemispheres and between morphs within hemispheres, suggesting that the convergent "integrifolia" morphology arose separately in each hemisphere. This is the first study to use whole-genome sequencing to understand genetic divergence in giant kelp ecomorphs, identifying 83 potential genes under selection and providing novel insights about Macrocystis evolution that were not evident with previous genetic techniques. Future studies are needed to uncover the environmental forces driving local adaptation and presumed convergent evolution of these morphs.
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Affiliation(s)
- Sara T Gonzalez
- Department of Ecology and Evolutionary Biology, University of California-Santa Cruz, Santa Cruz, CA, United States
| | - Filipe Alberto
- Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI, United States
| | - Gary Molano
- Department of Molecular and Computational Biology, University of Southern California, Los Angeles, CA, United States
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5
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Mazéas L, Yonamine R, Barbeyron T, Henrissat B, Drula E, Terrapon N, Nagasato C, Hervé C. Assembly and synthesis of the extracellular matrix in brown algae. Semin Cell Dev Biol 2023; 134:112-124. [PMID: 35307283 DOI: 10.1016/j.semcdb.2022.03.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 02/03/2022] [Accepted: 03/04/2022] [Indexed: 12/23/2022]
Abstract
In brown algae, the extracellular matrix (ECM) and its constitutive polymers play crucial roles in specialized functions, including algal growth and development. In this review we offer an integrative view of ECM construction in brown algae. We briefly report the chemical composition of its main constituents, and how these are interlinked in a structural model. We examine the ECM assembly at the tissue and cell level, with consideration on its structure in vivo and on the putative subcellular sites for the synthesis of its main constituents. We further discuss the biosynthetic pathways of two major polysaccharides, alginates and sulfated fucans, and the progress made beyond the candidate genes with the biochemical validation of encoded proteins. Key enzymes involved in the elongation of the glycan chains are still unknown and predictions have been made at the gene level. Here, we offer a re-examination of some glycosyltransferases and sulfotransferases from published genomes. Overall, our analysis suggests novel investigations to be performed at both the cellular and biochemical levels. First, to depict the location of polysaccharide structures in tissues. Secondly, to identify putative actors in the ECM synthesis to be functionally studied in the future.
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Affiliation(s)
- Lisa Mazéas
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France
| | - Rina Yonamine
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran 051-0013, Japan
| | - Tristan Barbeyron
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France
| | - Bernard Henrissat
- CNRS, Aix Marseille Univ, UMR 7257 AFMB, 13288 Marseille, France; INRAE, USC1408 AFMB, 13288 Marseille, France; Department of Biological Sciences, King Abdulaziz University, Jeddah, Saudi Arabia; Technical University of Denmark, DTU Bioengineering, DK-2800 Kgs., Lyngby, Denmark
| | - Elodie Drula
- CNRS, Aix Marseille Univ, UMR 7257 AFMB, 13288 Marseille, France; INRAE, USC1408 AFMB, 13288 Marseille, France
| | - Nicolas Terrapon
- CNRS, Aix Marseille Univ, UMR 7257 AFMB, 13288 Marseille, France; INRAE, USC1408 AFMB, 13288 Marseille, France
| | - Chikako Nagasato
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran 051-0013, Japan
| | - Cécile Hervé
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France.
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Beuder S, Braybrook SA. Brown algal cell walls and development. Semin Cell Dev Biol 2023; 134:103-111. [PMID: 35396168 DOI: 10.1016/j.semcdb.2022.03.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 02/17/2022] [Accepted: 03/04/2022] [Indexed: 10/18/2022]
Abstract
Brown algae are complex multicellular eukaryotes whose cells possess a cell wall, which is an important structure that regulates cell size and shape. Alginate and fucose-containing sulfated polysaccharides (FCSPs) are two carbohydrate types that have major roles in influencing the mechanical properties of the cell wall (i.e. increasing or decreasing wall stiffness), which in turn regulate cell expansion, division, adhesion, and other processes; however, how brown algal cell wall structure regulates its mechanical properties, and how this relationship influences cellular growth and organismal development, is not well-understood. This chapter is focused on reviewing what we currently know about how the roles of alginates and FCSPs in brown algal developmental processes, as well as how they influence the structural and mechanical properties of cell walls. Additionally, we discuss how brown algal mutants may be leveraged to learn more about the underlying mechanisms that regulate cell wall structure, mechanics, and developmental processes, and finally we propose questions to guide future research with the use of emerging technologies.
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Affiliation(s)
- Steven Beuder
- Department of Molecular, Cell, and Developmental Biology, UCLA, 610 Charles E Young Drive, Los Angeles, CA 90095, USA; California NanoSystems Institute, UCLA, 570 Westwood Plaza Building 114, Los Angeles, CA 90095, USA
| | - Siobhan A Braybrook
- Department of Molecular, Cell, and Developmental Biology, UCLA, 610 Charles E Young Drive, Los Angeles, CA 90095, USA; California NanoSystems Institute, UCLA, 570 Westwood Plaza Building 114, Los Angeles, CA 90095, USA; Molecular Biology Institute, UCLA, 611 Charles E. Young Drive, Los Angeles, CA 90095, USA.
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7
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Luis López-Miranda J, Molina GA, Esparza R, Alexis González-Reyna M, Silva R, Estévez M. Ecofriendly and sustainable Sargassum spp.-based system for the removal of highly used drugs during the COVID-19 pandemic. ARAB J CHEM 2022; 15:104169. [PMID: 35957843 PMCID: PMC9356597 DOI: 10.1016/j.arabjc.2022.104169] [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: 05/30/2022] [Accepted: 08/02/2022] [Indexed: 11/19/2022] Open
Abstract
Analgesic consumption increased significantly during the COVID-19 pandemic. A high concentration of this kind of drug is discarded in the urine, reaching the effluents of rivers, lakes, and seas. These medicines have brought serious problems for the flora and, especially, the ecosystems’ fauna. This paper presents the results of removing diclofenac, ibuprofen, and paracetamol in an aqueous solution, using Sargassum spp. from the Caribbean coast. The study consisted of mixing each drug in an aqueous solution with functionalized Sargassum spp in a container under constant agitation. Therefore, this work represents an alternative to solve two of the biggest problems in recent years; first, the reduction of the overpopulation of sargassum through its use for the remediation of the environment. Second is the removal of drug waste used excessively during the COVID-19 pandemic. Liquid samples of the solution were taken at intervals of 10 min and analyzed by fluorescence to determine the concentration of the drug. The sorption capacity for diclofenac, ibuprofen, and paracetamol was 2.46, 2.08, and 1.41 μg/g, corresponding to 98 %, 84 %, and 54 % of removal, respectively. The removal of the three drugs was notably favored by increasing the temperature to 30 and 40 °C, reaching efficiencies close to 100 %. Moreover, the system maintains its effectiveness at various pH values. In addition, the Sargassum used can be reused for up to three cycles without reducing its removal capacity. The wide diversity of organic compounds favors the biosorption of drugs, removing them through various kinetic mechanisms. On the other hand, the Sargassum used in the drugs removal was analyzed by X-ray diffraction, FTIR spectroscopy, TGA analysis, and scanning electron microscopy before and after removal. The results showed an evident modification in the structure and morphology of the algae and demonstrated the presence of the biosorbed drugs. Therefore, this system is sustainable, simple, economical, environmentally friendly, highly efficient, and scalable at a domestic and industrial level that can be used for aquatic remediation environments.
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Affiliation(s)
- J Luis López-Miranda
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, Mexico
| | - Gustavo A Molina
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, Mexico
| | - Rodrigo Esparza
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, Mexico
| | - Marlen Alexis González-Reyna
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, Mexico
| | - Rodolfo Silva
- Instituto de Ingeniería, Universidad Nacional Autónoma de México, Edificio 17, Ciudad Universitaria, Coyoacán, Mexico City 04510, Mexico
| | - Miriam Estévez
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro 76230, Mexico
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8
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Colaconema formosanum, Sarcodia suae, and Nostoc commune as Fermentation Substrates for Bioactive Substance Production. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation8070343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Bioactive compounds extracted from natural renewable sources have attracted an increased interest from both industry and academia. Recently, algae have been highlighted as promising sources of bioactive compounds, such as polyphenols, polysaccharides, fatty acids, proteins, and pigments, which can be used as functional ingredients in many industrial applications. Therefore, a simple green extraction and purification methodology capable of recovering biocompounds from algal biomass is of extreme importance in commercial production. In this study, we evaluated the application of three valuable algae (Colaconema formosanum, Sarcodia suae, and Nostoc commune) in combination with Pseudoalteromonas haloplanktis (type strain ATCC 14393) for the production of versatile compounds. The results illustrate that after 6 h of first-stage fermentation, the production of phycobiliproteins in C. formosanum was significantly increased by 156.2%, 188.9%, and 254.17% for PE, PC, and APC, respectively. This indicates that the production of phycobiliproteins from algae can be enhanced by P. haloplanktis. Furthermore, we discovered that after S. suae and N. commune were fermented with P. haloplanktis, mannose was produced. In this study, we describe a feasible biorefinery process for the production of phycobiliproteins and mannose by fermenting marine macroalgae with cyanobacteria. We believe it is worth establishing a scale-up technique by applying this fermentation method to the production of phycobiliproteins and mannose in the future.
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Nagasato C, Yonamine R, Motomura T. Ultrastructural Observation of Cytokinesis and Plasmodesmata Formation in Brown Algae. Methods Mol Biol 2022; 2382:253-264. [PMID: 34705245 DOI: 10.1007/978-1-0716-1744-1_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
Abstract
Similar to land plant cells, brown algal cells possess plasmodesmata with minute cytoplasmic tunnels, which enable the direct connection between adjacent cells. Plasmodesmata are distributed depending on the association of their formation with cytokinesis. Primary plasmodesmata are formed during cytokinesis, while secondary plasmodesmata appear on the cell wall septum following cytokinesis. Typically, the plasmodesmata of brown algae are cylindrical without the penetration of desmotubules from the endoplasmic reticulum, and there are no morphological differences between primary and secondary plasmodesmata. This present chapter describes the observation of cytokinesis and primary plasmodesmata formation in brown algae using electron microscopy as well as the examination of polysaccharide distribution using antibodies and enzyme-gold probes.
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Affiliation(s)
- Chikako Nagasato
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, Japan.
| | - Rina Yonamine
- Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
| | - Taizo Motomura
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, Japan
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10
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Yonamine R, Ichihara K, Tsuyuzaki S, Hervé C, Motomura T, Nagasato C. Changes in Cell Wall Structure During Rhizoid Formation of Silvetia babingtonii (Fucales, Phaeophyceae) Zygotes. JOURNAL OF PHYCOLOGY 2021; 57:1356-1367. [PMID: 33932028 DOI: 10.1111/jpy.13178] [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: 11/17/2020] [Accepted: 03/31/2021] [Indexed: 06/12/2023]
Abstract
We examined the ultrastructure of the cell wall and immunolocalization of alginates using specific antibodies against M-rich alginates and MG blocks during rhizoid formation in fucoid zygotes, Silvetia babingtonii. The thallus region of 24-h-old zygotes had a cell wall made of three layers with different fiber distribution. In the 12-h-old zygotes, three layers in the thallus were observed before rhizoid formation, namely the inner, middle, and outer layers. During rhizoid elongation, only the inner layer was apparent close to the rhizoid tip area. Immunoelectron microscopy detected M-rich blocks of alginate on the inner half of the cell wall, irrespective of the number of layers in the thallus and rhizoid regions. The MG blocks were seen to cover a slightly wider area than M-rich alginate blocks. It was suggested that parts of M in mannuronan would be rapidly converted to G, and MG-blocks are generated. Transcriptome analysis was performed using 3 -, 10 -, and 24-h-old zygotes after fertilization to examine the relationship between gene expression and alginate synthesis over time. The expression of two mannuronan C5-epimerase homologs that convert mannuronic acid into guluronic acid in alginates was upregulated or downregulated over the course of the examination.
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Affiliation(s)
- Rina Yonamine
- Graduate School of Environmental Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Kensuke Ichihara
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, 051-0013, Japan
| | - Shiro Tsuyuzaki
- Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Cécile Hervé
- Sorbonne Universités, CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff, 29680, Roscoff, France
| | - Taizo Motomura
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, 051-0013, Japan
| | - Chikako Nagasato
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, 051-0013, Japan
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11
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Haas KT, Wightman R, Meyerowitz EM, Peaucelle A. Pectin homogalacturonan nanofilament expansion drives morphogenesis in plant epidermal cells. Science 2020; 367:1003-1007. [PMID: 32108107 PMCID: PMC7932746 DOI: 10.1126/science.aaz5103] [Citation(s) in RCA: 161] [Impact Index Per Article: 40.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 01/24/2020] [Indexed: 12/18/2022]
Abstract
The process by which plant cells expand and gain shape has presented a challenge for researchers. Current models propose that these processes are driven by turgor pressure acting on the cell wall. Using nanoimaging, we show that the cell wall contains pectin nanofilaments that possess an intrinsic expansion capacity. Additionally, we use growth models containing such structures to show that a complex plant cell shape can derive from chemically induced local and polarized expansion of the pectin nanofilaments without turgor-driven growth. Thus, the plant cell wall, outside of the cell itself, is an active participant in shaping plant cells. Extracellular matrix function may similarly guide cell shape in other kingdoms, including Animalia.
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Affiliation(s)
- Kalina T Haas
- Medical Research Council Cancer Unit, University of Cambridge, Hutchison/MRC Research Centre, Hills Road, Cambridge CB2 0XZ, UK. .,Laboratoire Matière et Systèmes Complexes, Université Paris Diderot and CNRS UMR7057, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France
| | - Raymond Wightman
- Microscopy Core Facility, Sainsbury Laboratory, University of Cambridge, 47 Bateman Street, Cambridge CB2 1LR, UK
| | - Elliot M Meyerowitz
- Howard Hughes Medical Institute and Division of Biology and Biological Engineering 156-29, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA
| | - Alexis Peaucelle
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France.
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12
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Yu X, Choi SR, Chhapekar SS, Lu L, Ma Y, Lee JY, Hong S, Kim YY, Oh SH, Lim YP. Genetic and physiological analyses of root cracking in radish (Raphanus sativus L.). TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2019; 132:3425-3437. [PMID: 31562568 DOI: 10.1007/s00122-019-03435-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 09/17/2019] [Indexed: 06/10/2023]
Abstract
A major QTL conferring tolerance to radish (Raphanus sativus) root cracking was mapped for the first time and two calcium regulatory genes were identified that positively associated with the cracking phenomenon. Root cracking is a severe physiological disorder that significantly decreases the yield and commercial value of radish. The genetic and physiological mechanisms underlying this root cracking disorder have not been characterized. In this study, quantitative trait loci (QTLs) putatively associated with radish root cracking were mapped. Ten QTLs were distributed in six linkage groups, among these QTLs, 'RCr1' in LG1 was detected over 3 consecutive years and was considered to be a major QTL for root cracking. The QTL 'RCr1' was responsible for 4.47-18.11% of variance in the root cracking phenotype. We subsequently identified two candidate genes, RsANNAT and RsCDPK. Both genes encode proteins involved in calcium binding, ion transport, and Ca2+ signal transduction, which are important for regulating plant development and adaptations to the environment. These genes were co-localized to the major QTL region. Additionally, we analyzed physiological changes (i.e., root firmness, cell wall content, and cell-wall-bound calcium content) in two parental lines during different developmental stages. Moreover, we observed that the RsANNAT and RsCDPK expression levels are positively correlated with Ca2+ contents in the roots of the cracking-tolerant '835' cultivar. Thus, these genes may influence root cracking. The data provided herein may support the useful information to understand root cracking behavior in radish and may enable breeders to develop new cultivars exhibiting increased tolerance to root and fruit cracking.
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Affiliation(s)
- Xiaona Yu
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
- Agronomy Department, Qingdao Agricultural University, Qingdao, Shandong, China
| | - Su Ryun Choi
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
| | - Sushil Satish Chhapekar
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
| | - Lu Lu
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
| | - Yinbo Ma
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
| | - Ji-Young Lee
- School of Biological Sciences, College of Natural Science, Seoul National University, Seoul, South Korea
| | - Seongmin Hong
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
| | - Yoon-Young Kim
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
- Department of Variety Examination, National Forest Seed Variety Center, Chungju, 27495, South Korea
| | - Sang Heon Oh
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
| | - Yong Pyo Lim
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea.
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Rabillé H, Torode TA, Tesson B, Le Bail A, Billoud B, Rolland E, Le Panse S, Jam M, Charrier B. Alginates along the filament of the brown alga Ectocarpus help cells cope with stress. Sci Rep 2019; 9:12956. [PMID: 31506545 PMCID: PMC6736953 DOI: 10.1038/s41598-019-49427-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 08/23/2019] [Indexed: 11/29/2022] Open
Abstract
Ectocarpus is a filamentous brown alga, which cell wall is composed mainly of alginates and fucans (80%), two non-crystalline polysaccharide classes. Alginates are linear chains of epimers of 1,4-linked uronic acids, β-D-mannuronic acid (M) and α-L-guluronic acid (G). Previous physico-chemical studies showed that G-rich alginate gels are stiffer than M-rich alginate gels when prepared in vitro with calcium. In order to assess the possible role of alginates in Ectocarpus, we first immunolocalised M-rich or G-rich alginates using specific monoclonal antibodies along the filament. As a second step, we calculated the tensile stress experienced by the cell wall along the filament, and varied it with hypertonic or hypotonic solutions. As a third step, we measured the stiffness of the cell along the filament, using cell deformation measurements and atomic force microscopy. Overlapping of the three sets of data allowed to show that alginates co-localise with the stiffest and most stressed areas of the filament, namely the dome of the apical cell and the shanks of the central round cells. In addition, no major distinction between M-rich and G-rich alginate spatial patterns could be observed. Altogether, these results support that both M-rich and G-rich alginates play similar roles in stiffening the cell wall where the tensile stress is high and exposes cells to bursting, and that these roles are independent from cell growth and differentiation.
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Affiliation(s)
- Hervé Rabillé
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France
| | - Thomas A Torode
- The Sainsbury Laboratory, University of Cambridge, Bateman Street, Cambridge, United Kingdom
| | - Benoit Tesson
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
| | - Aude Le Bail
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France
- Department of Cell Biology, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Bernard Billoud
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France
| | - Elodie Rolland
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France
| | - Sophie Le Panse
- Platform Merimage, FR 2424, CNRS, Station Biologique, Roscoff, France
| | - Murielle Jam
- Marine Glycobiology team, UMR8227, CNRS-UPMC, Station Biologique, Roscoff, France
| | - Bénédicte Charrier
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France.
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14
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Rabillé H, Billoud B, Tesson B, Le Panse S, Rolland É, Charrier B. The brown algal mode of tip growth: Keeping stress under control. PLoS Biol 2019; 17:e2005258. [PMID: 30640903 PMCID: PMC6347293 DOI: 10.1371/journal.pbio.2005258] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 01/25/2019] [Accepted: 12/20/2018] [Indexed: 01/09/2023] Open
Abstract
Tip growth has been studied in pollen tubes, root hairs, and fungal and oomycete hyphae and is the most widely distributed unidirectional growth process on the planet. It ensures spatial colonization, nutrient predation, fertilization, and symbiosis with growth speeds of up to 800 μm h-1. Although turgor-driven growth is intuitively conceivable, a closer examination of the physical processes at work in tip growth raises a paradox: growth occurs where biophysical forces are low, because of the increase in curvature in the tip. All tip-growing cells studied so far rely on the modulation of cell wall extensibility via the polarized excretion of cell wall-loosening compounds at the tip. Here, we used a series of quantitative measurements at the cellular level and a biophysical simulation approach to show that the brown alga Ectocarpus has an original tip-growth mechanism. In this alga, the establishment of a steep gradient in cell wall thickness can compensate for the variation in tip curvature, thereby modulating wall stress within the tip cell. Bootstrap analyses support the robustness of the process, and experiments with fluorescence recovery after photobleaching (FRAP) confirmed the active vesicle trafficking in the shanks of the apical cell, as inferred from the model. In response to auxin, biophysical measurements change in agreement with the model. Although we cannot strictly exclude the involvement of a gradient in mechanical properties in Ectocarpus morphogenesis, the viscoplastic model of cell wall mechanics strongly suggests that brown algae have evolved an alternative strategy of tip growth. This strategy is largely based on the control of cell wall thickness rather than fluctuations in cell wall mechanical properties.
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Affiliation(s)
- Hervé Rabillé
- CNRS, Sorbonne Université, Morphogenesis of Macro Algae, UMR8227, Station Biologique, Roscoff, France
| | - Bernard Billoud
- CNRS, Sorbonne Université, Morphogenesis of Macro Algae, UMR8227, Station Biologique, Roscoff, France
| | - Benoit Tesson
- SCRIPPS Institution of Oceanography, University of California, San Diego, San Diego, California, United States of America
| | - Sophie Le Panse
- MerImage platform, FR2424, CNRS, Sorbonne Université, Station Biologique, Roscoff, France
| | - Élodie Rolland
- CNRS, Sorbonne Université, Morphogenesis of Macro Algae, UMR8227, Station Biologique, Roscoff, France
| | - Bénédicte Charrier
- CNRS, Sorbonne Université, Morphogenesis of Macro Algae, UMR8227, Station Biologique, Roscoff, France
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15
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Terauchi M, Yamagishi T, Hanyuda T, Kawai H. Genome-wide computational analysis of the secretome of brown algae (Phaeophyceae). Mar Genomics 2017; 32:49-59. [PMID: 28063828 DOI: 10.1016/j.margen.2016.12.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 12/06/2016] [Accepted: 12/16/2016] [Indexed: 11/25/2022]
Abstract
Brown algae have evolved complex multicellularity in the heterokont lineage. They are phylogenetically distant to land plants, fungi and animals. Especially, the members of Laminariales (so-called kelps) have developed highly differentiated tissues. Extracellular matrix (ECM) plays pivotal roles in a number of essential processes in multicellular organisms, such as cell adhesion, cell and tissue differentiations, cell-to-cell communication, and responses to environmental stimuli. In these processes, a set of extracellular secreted proteins called the secretome operates remodeling of the physicochemical nature of ECM and signal transduction by interacting with cell surface proteins and signaling molecules. Characterization of the secretome is a critical step to clarify the contributions of ECM to the multicellularity of brown algae. However, the identity of the brown algal secretome has been poorly understood. In order to reveal the repertory of the brown algal secretome and its involvement in the evolution of Laminariales, we conducted a genome-wide analysis of the brown algal secretome utilizing the published complete genome data of Ectocarpus siliculosus and Saccharina japonica as well as newly obtained RNA-seq data of seven laminarialean species (Agarum clathratum, Alaria crassifolia, Aureophycus aleuticus, Costaria costata, Pseudochorda nagaii, Saccharina angustata and Undaria pinnatifida) largely covering the laminarialean families. We established the in silico pipeline to systematically and accurately detect the secretome by combining multiple prediction algorithms for the N-terminal signal peptide and transmembrane domain within the protein sequence. From 16,189 proteins of E. siliculosus and 18,733 proteins of S. japonica, 552 and 964 proteins respectively were predicted to be classified as the secretome. Conserved domain analysis showed that the domain repertory were very similar to each other, and that of the brown algal secretome was partially common with that of the secretome of other multicellular organisms (land plants, fungi and animals). In the laminarialean species, it was estimated that the gene abundance and the domain architecture of putative ECM remodeling-related proteins were altered compared with those of E. siliculosus, and that the alteration started from the basal group of Laminariales. These results suggested that brown algae have developed their own secretome, and its functions became more elaborated in the more derived members in Laminariales.
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Affiliation(s)
- Makoto Terauchi
- Organization for Advanced and Integrated Research, Kobe University, Kobe 657-8501, Japan.
| | | | - Takeaki Hanyuda
- Research Center for Inland Seas, Kobe University, Kobe 657-8501, Japan
| | - Hiroshi Kawai
- Research Center for Inland Seas, Kobe University, Kobe 657-8501, Japan
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16
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Jia F, Ben Amar M, Billoud B, Charrier B. Morphoelasticity in the development of brown alga Ectocarpus siliculosus: from cell rounding to branching. J R Soc Interface 2017; 14:20160596. [PMID: 28228537 PMCID: PMC5332559 DOI: 10.1098/rsif.2016.0596] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 01/27/2017] [Indexed: 11/29/2022] Open
Abstract
A biomechanical model is proposed for the growth of the brown alga Ectocarpus siliculosus Featuring ramified uniseriate filaments, this alga has two modes of growth: apical growth and intercalary growth with branching. Apical growth occurs upon the mitosis of a young cell at one extremity and leads to a new tip cell followed by a cylindrical cell, whereas branching mainly occurs when a cylindrical cell becomes rounded and swells, forming a spherical cell. Given the continuous interplay between cell growth and swelling, a poroelastic model combining osmotic pressure and volumetric growth is considered for the whole cell, cytoplasm and cell wall. The model recovers the morphogenetic transformations of mature cells: transformation of a cylindrical shape into spherical shape with a volumetric increase, and then lateral branching. Our simulations show that the poro-elastic model, including the Mooney-Rivlin approach for hyper-elastic materials, can correctly reproduce the observations. In particular, branching appears to be a plasticity effect due to the high level of tension created after the increase in volume of mature cells.
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Affiliation(s)
- Fei Jia
- School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Sichuan 621010, People's Republic of China
| | - Martine Ben Amar
- Laboratoire de Physique Statistique, Ecole Normale Supérieure, PSL Research University, Sorbonne Universités UPMC Univ Paris 06, CNRS, 24 rue Lhomond, 75005 Paris, France
- Institut Universitaire de Cancérologie, Faculté de médecine, Université Pierre et Marie Curie-Paris 6, 91 Bd de l'Hôpital, 75013 Paris, France
| | - Bernard Billoud
- UMR8227 CNRS-UPMC, Station Biologique, Place George Teissier, 29680 Roscoff, France
| | - Bénédicte Charrier
- UMR8227 CNRS-UPMC, Station Biologique, Place George Teissier, 29680 Roscoff, France
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