1
|
Lindström S, Sanei H, van de Schootbrugge B, Pedersen GK, Lesher CE, Tegner C, Heunisch C, Dybkjær K, Outridge PM. Volcanic mercury and mutagenesis in land plants during the end-Triassic mass extinction. Sci Adv 2019; 5:eaaw4018. [PMID: 31681836 PMCID: PMC6810405 DOI: 10.1126/sciadv.aaw4018] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 09/13/2019] [Indexed: 06/01/2023]
Abstract
During the past 600 million years of Earth history, four of five major extinction events were synchronous with volcanism in large igneous provinces. Despite improved temporal frameworks for these events, the mechanisms causing extinctions remain unclear. Volcanic emissions of greenhouse gases, SO2, and halocarbons are generally considered as major factors in the biotic crises, resulting in global warming, acid deposition, and ozone layer depletion. Here, we show that pulsed elevated concentrations of mercury in marine and terrestrial sediments across the Triassic-Jurassic boundary in southern Scandinavia and northern Germany correlate with intense volcanic activity in the Central Atlantic Magmatic Province. The increased levels of mercury-the most genotoxic element on Earth-also correlate with high occurrences of abnormal fern spores, indicating severe environmental stress and genetic disturbance in the parent plants. We conclude that this offers compelling evidence that emissions of toxic volcanogenic substances contributed to the end-Triassic biotic crisis.
Collapse
Affiliation(s)
- Sofie Lindström
- Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
| | - Hamed Sanei
- Department of Geoscience, Aarhus University, Hoegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
| | - Bas van de Schootbrugge
- Department of Earth Sciences, Marine Palynology and Paleoceanography, Utrecht University, Princetonlaan 8A, 3584 CB Utrecht, Netherlands
| | - Gunver K. Pedersen
- Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
| | - Charles E. Lesher
- Department of Geoscience, Aarhus University, Hoegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
- Department of Earth and Planetary Sciences, University of California, Davis, Davis, CA 95616, USA
| | - Christian Tegner
- Department of Geoscience, Aarhus University, Hoegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
| | - Carmen Heunisch
- State Authority for Mining, Energy and Geology, Stilleweg 2, D-30655 Hannover, Germany
| | - Karen Dybkjær
- Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
| | - Peter M. Outridge
- Geological Survey of Canada, Natural Resources Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
| |
Collapse
|
2
|
Takagi D, Ishizaki K, Hanawa H, Mabuchi T, Shimakawa G, Yamamoto H, Miyake C. Diversity of strategies for escaping reactive oxygen species production within photosystem I among land plants: P700 oxidation system is prerequisite for alleviating photoinhibition in photosystem I. Physiol Plant 2017; 161:56-74. [PMID: 28295410 DOI: 10.1111/ppl.12562] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 12/28/2016] [Accepted: 02/07/2017] [Indexed: 05/24/2023]
Abstract
In land plants, photosystem I (PSI) photoinhibition limits carbon fixation and causes growth defects. In addition, recovery from PSI photoinhibition takes much longer than PSII photoinhibition when the PSI core-complex is degraded by oxidative damage. Accordingly, PSI photoinhibition should be avoided in land plants, and land plants should have evolved mechanisms to prevent PSI photoinhibition. However, such protection mechanisms have not yet been identified, and it remains unclear whether all land plants suffer from PSI photoinhibition in the same way. In the present study, we focused on the susceptibility of PSI to photoinhibition and investigated whether mechanisms of preventing PSI photoinhibition varied among land plant species. To assess the susceptibility of PSI to photoinhibition, we used repetitive short-pulse (rSP) illumination, which specifically induces PSI photoinhibition. Subsequently, we found that land plants possess a wide variety of tolerance mechanisms against PSI photoinhibition. In particular, gymnosperms, ferns and mosses/liverworts exhibited higher tolerance to rSP illumination-induced PSI photoinhibition than angiosperms, and detailed analyses indicated that the tolerance of these groups could be partly attributed to flavodiiron proteins, which protected PSI from photoinhibition by oxidizing the PSI reaction center chlorophyll (P700) as an electron acceptor. Furthermore, we demonstrate, for the first time, that gymnosperms, ferns and mosses/liverworts possess a protection mechanism against photoinhibition of PSI that differs from that of angiosperms.
Collapse
Affiliation(s)
- Daisuke Takagi
- Department of Biological and Environmental Science, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University, Nada, 657-8501, Japan
- Core Research for Environmental Science and Technology, Japan Science and Technology Agency, Tokyo, 102-0076, Japan
| | | | - Hitomi Hanawa
- Department of Biological and Environmental Science, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University, Nada, 657-8501, Japan
- Core Research for Environmental Science and Technology, Japan Science and Technology Agency, Tokyo, 102-0076, Japan
| | - Tomohito Mabuchi
- Department of Biological and Environmental Science, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University, Nada, 657-8501, Japan
| | - Ginga Shimakawa
- Department of Biological and Environmental Science, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University, Nada, 657-8501, Japan
| | - Hiroshi Yamamoto
- Department of Botany, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Chikahiro Miyake
- Department of Biological and Environmental Science, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University, Nada, 657-8501, Japan
- Core Research for Environmental Science and Technology, Japan Science and Technology Agency, Tokyo, 102-0076, Japan
| |
Collapse
|
3
|
Bonnot C, Proust H, Pinson B, Colbalchini FPL, Lesly-Veillard A, Breuninger H, Champion C, Hetherington AJ, Kelly S, Dolan L. Functional PTB phosphate transporters are present in streptophyte algae and early diverging land plants. New Phytol 2017; 214:1158-1171. [PMID: 28134432 DOI: 10.1111/nph.14431] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 12/15/2016] [Indexed: 05/12/2023]
Abstract
Two inorganic phosphate (Pi) uptake mechanisms operate in streptophytes and chlorophytes, the two lineages of green plants. PHOSPHATE TRANSPORTER B (PTB) proteins are hypothesized to be the Na+ /Pi symporters catalysing Pi uptake in chlorophytes, whereas PHOSPHATE TRANSPORTER 1 (PHT1) proteins are the H+ /Pi symporters that carry out Pi uptake in angiosperms. PHT1 proteins are present in all streptophyte lineages. However, Pi uptake in streptophyte algae and marine angiosperms requires Na+ influx, suggesting that Na+ /Pi symporters also function in some streptophytes. We tested the hypothesis that Na+ /Pi symporters exist in streptophytes. We identified PTB sequences in streptophyte genomes. Core PTB proteins are present at the plasma membrane of the liverwort Marchantia polymorpha. The expression of M. polymorpha core PTB proteins in the Saccharomyces cerevisiae pho2 mutant defective in high-affinity Pi transport rescues growth in low-Pi environments. Moreover, levels of core PTB mRNAs of M. polymorpha and the streptophyte alga Coleochaete nitellarum are higher in low-Pi than in Pi-replete conditions, consistent with a role in Pi uptake from the environment. We conclude that land plants inherited two Pi uptake mechanisms - mediated by the PTB and PHT1 proteins, respectively - from their streptophyte algal ancestor. Both systems operate in parallel in extant early diverging land plants.
Collapse
Affiliation(s)
- Clémence Bonnot
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
| | - Hélène Proust
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
| | - Benoît Pinson
- Centre National de la Recherche Scientifique (CNRS), UMR 5095 Institut de Biochimie et Génétique Cellulaire (IBGC), Bordeaux Cedex, F-33077, France
- Université de Bordeaux, Bordeaux, F-33000, France
| | | | - Alexis Lesly-Veillard
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
| | - Holger Breuninger
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
| | - Clément Champion
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
| | | | - Steven Kelly
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
| | - Liam Dolan
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
| |
Collapse
|
4
|
Sotiriou P, Giannoutsou E, Panteris E, Apostolakos P, Galatis B. Cell wall matrix polysaccharide distribution and cortical microtubule organization: two factors controlling mesophyll cell morphogenesis in land plants. Ann Bot 2016; 117:401-19. [PMID: 26802013 PMCID: PMC4765543 DOI: 10.1093/aob/mcv187] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 10/27/2015] [Accepted: 11/05/2015] [Indexed: 05/18/2023]
Abstract
BACKGROUND AND AIMS This work investigates the involvement of local differentiation of cell wall matrix polysaccharides and the role of microtubules in the morphogenesis of mesophyll cells (MCs) of three types (lobed, branched and palisade) in the dicotyledon Vigna sinensis and the fern Asplenium nidus. METHODS Homogalacturonan (HGA) epitopes recognized by the 2F4, JIM5 and JIM7 antibodies and callose were immunolocalized in hand-made leaf sections. Callose was also stained with aniline blue. We studied microtubule organization by tubulin immunofluorescence and transmission electron microscopy. RESULTS In both plants, the matrix cell wall polysaccharide distribution underwent definite changes during MC differentiation. Callose constantly defined the sites of MC contacts. The 2F4 HGA epitope in V. sinensis first appeared in MC contacts but gradually moved towards the cell wall regions facing the intercellular spaces, while in A. nidus it was initially localized at the cell walls delimiting the intercellular spaces, but finally shifted to MC contacts. In V. sinensis, the JIM5 and JIM7 HGA epitopes initially marked the cell walls delimiting the intercellular spaces and gradually shifted in MC contacts, while in A. nidus they constantly enriched MC contacts. In all MC types examined, the cortical microtubules played a crucial role in their morphogenesis. In particular, in palisade MCs, cortical microtubule helices, by controlling cellulose microfibril orientation, forced these MCs to acquire a truncated cone-like shape. Unexpectedly in V. sinensis, the differentiation of colchicine-affected MCs deviated completely, since they developed a cell wall ingrowth labyrinth, becoming transfer-like cells. CONCLUSIONS The results of this work and previous studies on Zea mays (Giannoutsou et al., Annals of Botany 2013; 112: : 1067-1081) revealed highly controlled local cell wall matrix differentiation in MCs of species belonging to different plant groups. This, in coordination with microtubule-dependent cellulose microfibril alignment, spatially controlled cell wall expansion, allowing MCs to acquire their particular shape.
Collapse
Affiliation(s)
- P Sotiriou
- Department of Botany, Faculty of Biology, University of Athens, Athens 15784, Greece and
| | - E Giannoutsou
- Department of Botany, Faculty of Biology, University of Athens, Athens 15784, Greece and
| | - E Panteris
- Department of Botany, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - P Apostolakos
- Department of Botany, Faculty of Biology, University of Athens, Athens 15784, Greece and
| | - B Galatis
- Department of Botany, Faculty of Biology, University of Athens, Athens 15784, Greece and
| |
Collapse
|
5
|
Anjum NA, Adam V, Kizek R, Duarte AC, Pereira E, Iqbal M, Lukatkin AS, Ahmad I. Nanoscale copper in the soil-plant system - toxicity and underlying potential mechanisms. Environ Res 2015; 138:306-25. [PMID: 25749126 DOI: 10.1016/j.envres.2015.02.019] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 01/15/2015] [Accepted: 02/16/2015] [Indexed: 05/14/2023]
Abstract
Nanoscale copper particles (nano-Cu) are used in many antimicrobial formulations and products for their antimicrobial activity. They may enter deliberately and/or accidentally into terrestrial environments including soils. Being the major 'eco-receptors' of nanoscale particles in the terrestrial ecosystem, soil-microbiota and plants (the soil-plant system) have been used as a model to dissect the potential impact of these particles on the environmental and human health. In the soil-plant system, the plant can be an indirect non-target organism of the soil-associated nano-Cu that may in turn affect plant-based products and their consumers. By all accounts, information pertaining to nano-Cu toxicity and the underlying potential mechanisms in the soil-plant system remains scanty, deficient and little discussed. Therefore, based on some recent reports from (bio)chemical, molecular and genetic studies of nano-Cu versus soil-plant system, this article: (i) overviews the status, chemistry and toxicity of nano-Cu in soil and plants, (ii) discusses critically the poorly understood potential mechanisms of nano-Cu toxicity and tolerance both in soil-microbiota and plants, and (iii) proposes future research directions. It appears from studies hitherto made that the uncontrolled generation and inefficient metabolism of reactive oxygen species through different reactions are the major factors underpinning the overall nano-Cu consequences in both the systems. However, it is not clear whether the nano-Cu or the ion released from it is the cause of the toxicity. We advocate to intensify the multi-approach studies focused at a complete characterization of the nano-Cu, its toxicity (during life cycles of the least-explored soil-microbiota and plants), and behavior in an environmentally relevant terrestrial exposure setting. Such studies may help to obtain a deeper insight into nano-Cu actions and address adequately the nano-Cu-associated safety concerns in the 'soil-plant system'.
Collapse
Affiliation(s)
- Naser A Anjum
- CESAM-Centre for Environmental and Marine Studies & Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Vojtech Adam
- Department of Chemistry and Biochemistry, Faculty of Agronomy, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czech Republic; Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, CZ-616 00 Brno, Czech Republic
| | - Rene Kizek
- Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, CZ-616 00 Brno, Czech Republic
| | - Armando C Duarte
- CESAM-Centre for Environmental and Marine Studies & Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Eduarda Pereira
- CESAM-Centre for Environmental and Marine Studies & Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Muhammad Iqbal
- Department of Botany, Faculty of Science, Hamdard University, New Delhi 110062, India
| | - Alexander S Lukatkin
- Department of Botany, Plant Physiology and Ecology, N.P. Ogarev Mordovia State University, Bolshevistskaja Str., 68. Saransk 430005, Russia
| | - Iqbal Ahmad
- CESAM-Centre for Environmental and Marine Studies & Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal; CESAM-Centre for Environmental and Marine Studies & Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal.
| |
Collapse
|
6
|
Petraglia A, De Benedictis M, Degola F, Pastore G, Calcagno M, Ruotolo R, Mengoni A, Sanità di Toppi L. The capability to synthesize phytochelatins and the presence of constitutive and functional phytochelatin synthases are ancestral (plesiomorphic) characters for basal land plants. J Exp Bot 2014; 65:1153-63. [PMID: 24449382 DOI: 10.1093/jxb/ert472] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Bryophytes, a paraphyletic group which includes liverworts, mosses, and hornworts, have been stated as land plants that under metal stress (particularly cadmium) do not synthesize metal-binding peptides such as phytochelatins. Moreover, very little information is available to date regarding phytochelatin synthesis in charophytes, postulated to be the direct ancestors of land plants, or in lycophytes, namely very basal tracheophytes. In this study, it was hypothesized that basal land plants and charophytes have the capability to produce phytochelatins and possess constitutive and functional phytochelatin synthases. To verify this hypothesis, twelve bryophyte species (six liverworts, four mosses, and two hornworts), three charophytes, and two lycophyte species were exposed to 0-36 μM cadmium for 72 h, and then assayed for: (i) glutathione and phytochelatin quali-quantitative content by HPLC and mass spectrometry; (ii) the presence of putative phytochelatin synthases by western blotting; and (iii) in vitro activity of phytochelatin synthases. Of all the species tested, ten produced phytochelatins in vivo, while the other seven did not. The presence of a constitutively expressed and functional phytochelatin synthase was demonstrated in all the bryophyte lineages and in the lycophyte Selaginella denticulata, but not in the charophytes. Hence, current knowledge according to phytochelatins have been stated as being absent in bryophytes was therefore confuted by this work. It is argued that the capability to synthesize phytochelatins, as well as the presence of active phytochelatin synthases, are ancestral (plesiomorphic) characters for basal land plants.
Collapse
Affiliation(s)
- Alessandro Petraglia
- Department of Life Sciences, University of Parma, Parco Area delle Scienze 11/A, I-43124 Parma, Italy
| | | | | | | | | | | | | | | |
Collapse
|
7
|
Roberts I, Smith S, De Rybel B, Van Den Broeke J, Smet W, De Cokere S, Mispelaere M, De Smet I, Beeckman T. The CEP family in land plants: evolutionary analyses, expression studies, and role in Arabidopsis shoot development. J Exp Bot 2013; 64:5371-81. [PMID: 24179095 DOI: 10.1093/jxb/ert331] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In Arabidopsis, more than 1000 putative small signalling peptides have been predicted, but very few have been functionally characterized. One class of small post-translationally modified signalling peptides is the C-TERMINALLY ENCODED PEPTIDE (CEP) family, of which one member has been shown to be involved in regulating root architecture. This work applied a bioinformatics approach to identify more members of the CEP family. It identified 10 additional members and revealed that this family only emerged in flowering plants and was absent from extant members of more primitive plants. The data suggest that the CEP proteins form two subgroups according to the CEP domain. This study further provides an overview of specific CEP expression patterns that offers a comprehensive framework to study the role of the CEP signalling peptides in plant development. For example, expression patterns point to a role in aboveground tissues which was corroborated by the analysis of transgenic lines with perturbed CEP levels. These results form the basis for further exploration of the mechanisms underlying this family of peptides and suggest their putative roles in distinct developmental events of higher plants.
Collapse
Affiliation(s)
- Ianto Roberts
- Department of Plant Systems Biology, VIB, Technologiepark 927, B-9052 Ghent, Belgium
| | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Shukla D, Kesari R, Tiwari M, Dwivedi S, Tripathi RD, Nath P, Trivedi PK. Expression of Ceratophyllum demersum phytochelatin synthase, CdPCS1, in Escherichia coli and Arabidopsis enhances heavy metal(loid)s accumulation. Protoplasma 2013; 250:1263-72. [PMID: 23702817 DOI: 10.1007/s00709-013-0508-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 05/02/2013] [Indexed: 05/08/2023]
Abstract
Phytochelatin synthase (PCS) gene encoding key enzyme for heavy metal detoxification and accumulation has been characterised from different sources and used to develop a technology for bioremediation. Past efforts provided limited success and contradictory results. Therefore, functional characterisation of PCS gene from new sources into different target systems is considered as an important task in the area of bioremediation. Earlier, we isolated and functionally characterised PCS gene from an aquatic macrophyte Ceratophyllum demersum L., a metal accumulator aquatic plant. Expression of this gene, CdPCS1, in tobacco enhanced PC synthesis and metal accumulation of transgenic tobacco plants. In the present study, we have expressed CdPCS1 in more diverse systems, Escherichia coli and Arabidopsis, and studied growth and metal accumulation of transgenic organisms. The expression of CdPCS1 in E. coli offered tolerance against cadmium as well as higher accumulation accompanied with PCS1 activity. The expression of CdPCS1 in Arabidopsis showed a significant enhanced accumulation of heavy metal(loid)s in aerial parts without significant difference in growth parameters in comparison to wild-type Arabidopsis plants. Our study suggests that CdPCS1 can be utilised for enhancing bioremediation potential of different organisms using biotechnological approaches.
Collapse
Affiliation(s)
- Devesh Shukla
- National Botanical Research Institute (NBRI), Council of Scientific and Industrial Research (CSIR), Rana Pratap Marg, Lucknow, 226001, India
| | | | | | | | | | | | | |
Collapse
|