1
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Brunetti C, Moura BB, Velikova V. Editorial: Biogenic volatiles in natural and urban forest. Front Plant Sci 2023; 14:1233612. [PMID: 37538066 PMCID: PMC10395331 DOI: 10.3389/fpls.2023.1233612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 07/10/2023] [Indexed: 08/05/2023]
Affiliation(s)
- Cecilia Brunetti
- Institute for Sustainable Plant Protection (IPSP), National Research Council, Sesto Fiorentino, Italy
| | - Barbara Baesso Moura
- Institute of Research on Terrestrial Ecosystems (IRET), National Research Council, Sesto Fiorentino, Italy
- National Biodiversity Future Center (NBFC), Palermo, Italy
| | - Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria
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2
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Krumova S, Petrova A, Petrova N, Stoichev S, Ilkov D, Tsonev T, Petrov P, Koleva D, Velikova V. Seed Priming with Single-Walled Carbon Nanotubes Grafted with Pluronic P85 Preserves the Functional and Structural Characteristics of Pea Plants. Nanomaterials (Basel) 2023; 13:1332. [PMID: 37110917 PMCID: PMC10143637 DOI: 10.3390/nano13081332] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 04/07/2023] [Accepted: 04/10/2023] [Indexed: 06/19/2023]
Abstract
The engineering of carbon nanotubes in the last decades resulted in a variety of applications in electronics, electrochemistry, and biomedicine. A number of reports also evidenced their valuable application in agriculture as plant growth regulators and nanocarriers. In this work, we explored the effect of seed priming with single-walled carbon nanotubes grafted with Pluronic P85 polymer (denoted P85-SWCNT) on Pisum sativum (var. RAN-1) seed germination, early stages of plant development, leaf anatomy, and photosynthetic efficiency. We evaluated the observed effects in relation to hydro- (control) and P85-primed seeds. Our data clearly revealed that seed priming with P85-SWCNT is safe for the plant since it does not impair the seed germination, plant development, leaf anatomy, biomass, and photosynthetic activity, and even increases the amount of photochemically active photosystem II centers in a concentration-dependent manner. Only 300 mg/L concentration exerts an adverse effect on those parameters. The P85 polymer, however, was found to exhibit a number of negative effects on plant growth (i.e., root length, leaf anatomy, biomass accumulation and photoprotection capability), most probably related to the unfavorable interaction of P85 unimers with plant membranes. Our findings substantiate the future exploration and exploitation of P85-SWCNT as nanocarriers of specific substances promoting not only plant growth at optimal conditions but also better plant performance under a variety of environmental stresses.
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Affiliation(s)
- Sashka Krumova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., Bl. 21, 1113 Sofia, Bulgaria; (S.K.); (N.P.); (S.S.); (T.T.)
| | - Asya Petrova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., Bl. 21, 1113 Sofia, Bulgaria; (A.P.); (D.I.)
| | - Nia Petrova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., Bl. 21, 1113 Sofia, Bulgaria; (S.K.); (N.P.); (S.S.); (T.T.)
- Institute of Plant Biology, Biological Research Centre, Temesváry krt. 62, 6726 Szeged, Hungary
| | - Svetozar Stoichev
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., Bl. 21, 1113 Sofia, Bulgaria; (S.K.); (N.P.); (S.S.); (T.T.)
| | - Daniel Ilkov
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., Bl. 21, 1113 Sofia, Bulgaria; (A.P.); (D.I.)
| | - Tsonko Tsonev
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., Bl. 21, 1113 Sofia, Bulgaria; (S.K.); (N.P.); (S.S.); (T.T.)
| | - Petar Petrov
- Institute of Polymers, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., Bl. 103, 1113 Sofia, Bulgaria;
| | - Dimitrina Koleva
- Faculty of Biology, Sofia University, “St. Kliment Ohridsky”, 1000 Sofia, Bulgaria;
| | - Violeta Velikova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., Bl. 21, 1113 Sofia, Bulgaria; (S.K.); (N.P.); (S.S.); (T.T.)
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Str., Bl. 21, 1113 Sofia, Bulgaria; (A.P.); (D.I.)
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3
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Teneva I, Velikova V, Belkinova D, Moten D, Dzhambazov B. Allelopathic Potential of the Cyanotoxins Microcystin-LR and Cylindrospermopsin on Green Algae. Plants (Basel) 2023; 12:1403. [PMID: 36987092 PMCID: PMC10057654 DOI: 10.3390/plants12061403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 03/14/2023] [Accepted: 03/20/2023] [Indexed: 06/19/2023]
Abstract
Allelopathic interactions are widespread in all aquatic habitats, among all groups of aquatic primary biomass producers, including cyanobacteria. Cyanobacteria are producers of potent toxins called cyanotoxins, whose biological and ecological roles, including their allelopathic influence, are still incompletely understood. The allelopathic potential of the cyanotoxins microcystin-LR (MC-LR) and cylindrospermopsin (CYL) on green algae (Chlamydomonas asymmetrica, Dunaliella salina, and Scenedesmus obtusiusculus) was established. Time-dependent inhibitory effects on the growth and motility of the green algae exposed to cyanotoxins were detected. Changes in their morphology (cell shape, granulation of the cytoplasm, and loss of flagella) were also observed. The cyanotoxins MC-LR and CYL were found to affect photosynthesis to varying degrees in the green algae Chlamydomonas asymmetrica, Dunaliella salina, and Scenedesmus obtusiusculus, affecting chlorophyll fluorescence parameters such as the maximum photochemical activity (Fv/Fm) of photosystem II (PSII), the non-photochemical quenching of chlorophyll fluorescence (NPQ), and the quantum yield of the unregulated energy dissipation Y(NO) in PSII. In the context of ongoing climate change and the associated expectations of the increased frequency of cyanobacterial blooms and released cyanotoxins, our results demonstrated the possible allelopathic role of cyanotoxins on competing autotrophs in the phytoplankton communities.
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Affiliation(s)
- Ivanka Teneva
- Faculty of Biology, Paisii Hilendarski University of Plovdiv, 4000 Plovdiv, Bulgaria
| | - Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Detelina Belkinova
- Faculty of Biology, Paisii Hilendarski University of Plovdiv, 4000 Plovdiv, Bulgaria
- Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Dzhemal Moten
- Faculty of Biology, Paisii Hilendarski University of Plovdiv, 4000 Plovdiv, Bulgaria
| | - Balik Dzhambazov
- Faculty of Biology, Paisii Hilendarski University of Plovdiv, 4000 Plovdiv, Bulgaria
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4
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Velikova V, Dani KGS, Loreto F. Origin, evolution, and future of isoprene and nitric oxide interactions within leaves. J Exp Bot 2023; 74:688-706. [PMID: 36420758 DOI: 10.1093/jxb/erac459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 07/31/2022] [Accepted: 11/18/2022] [Indexed: 06/16/2023]
Abstract
Photolytic generation of nitric oxide (NO), isoprene, and reactive oxygen species (ROS) pre-dated life on Earth (~4 billion years ago). However, isoprene-ROS-NO interactions became relevant to climate chemistry ~50 million years ago, after aquatic and terrestrial ecosystems became dominated by isoprene-emitting diatoms and angiosperms. Today, NO and NO2 (together referred to as NOx) are dangerous biogenic gaseous atmospheric pollutants. In plants, NO, with its multiple sources and sinks, acts as a secondary messenger that regulates development at low doses and induces cell death at high doses. Likewise, biogenic isoprene is a putative antioxidant and hormone 'enabler' that hastens plant (and leaf) growth and reproduction, and improves plant tolerance to transient abiotic stresses. Using examples from controlled-chamber simulation and field studies of isoprene oxidation, we discuss the likely nature and extent of isoprene oxidation within leaves. We argue that isoprene-NO interactions vary greatly among plant species, driven by differences in isoprene emission rate and nitrate assimilation capacity (i.e. NO sink strength), ROS availability, and the within-leaf ratio between free-NO and isoprene. In a warmer and CO2-fertilized future climate, antagonism between isoprene and NO within leaves will probably occur in a NO-rich (relative to present) environment, yielding a greater proportion of isoprene oxidation products, and inducing major changes in NO-mediated growth and stress responses.
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Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria
| | - Kaidala Ganesha Srikanta Dani
- Institute for Sustainable Plant Protection, National Research Council of Italy, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Francesco Loreto
- Institute for Sustainable Plant Protection, National Research Council of Italy, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
- Department of Biology, University of Naples Federico II, Via Cinthia, 80126 Naples, Italy
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5
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Pollastri S, Velikova V, Castaldini M, Fineschi S, Ghirardo A, Renaut J, Schnitzler JP, Sergeant K, Winkler JB, Zorzan S, Loreto F. Isoprene-Emitting Tobacco Plants Are Less Affected by Moderate Water Deficit under Future Climate Change Scenario and Show Adjustments of Stress-Related Proteins in Actual Climate. Plants (Basel) 2023; 12:333. [PMID: 36679046 PMCID: PMC9862500 DOI: 10.3390/plants12020333] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 01/02/2023] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
Isoprene-emitting plants are better protected against thermal and oxidative stresses, which is a desirable trait in a climate-changing (drier and warmer) world. Here we compared the ecophysiological performances of transgenic isoprene-emitting and wild-type non-emitting tobacco plants during water stress and after re-watering in actual environmental conditions (400 ppm of CO2 and 28 °C of average daily temperature) and in a future climate scenario (600 ppm of CO2 and 32 °C of average daily temperature). Furthermore, we intended to complement the present knowledge on the mechanisms involved in isoprene-induced resistance to water deficit stress by examining the proteome of transgenic isoprene-emitting and wild-type non-emitting tobacco plants during water stress and after re-watering in actual climate. Isoprene emitters maintained higher photosynthesis and electron transport rates under moderate stress in future climate conditions. However, physiological resistance to water stress in the isoprene-emitting plants was not as marked as expected in actual climate conditions, perhaps because the stress developed rapidly. In actual climate, isoprene emission capacity affected the tobacco proteomic profile, in particular by upregulating proteins associated with stress protection. Our results strengthen the hypothesis that isoprene biosynthesis is related to metabolic changes at the gene and protein levels involved in the activation of general stress defensive mechanisms of plants.
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Affiliation(s)
- Susanna Pollastri
- Institute for Sustainable Plant Protection (IPSP), National Research Council of Italy (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria
| | - Maurizio Castaldini
- Council for Agricultural Research and Economics, Research Center for Agriculture and Environment, Via di Lanciola 12/A, 50125 Cascine del Riccio, Florence, Italy
| | - Silvia Fineschi
- Institute of Heritage Science-CNR (ISPC), National Research Council of Italy (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Andrea Ghirardo
- Research Unit Environmental Simulation (EUS), Helmholtz Zentrum München, Institute of Biochemical Plant Pathology, D-85764 Neuherberg, Germany
| | - Jenny Renaut
- GreenTech Innovation Centre, Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Scienceand Technology (LIST), L-4362 Esch-sur-Alzette, Luxembourg
| | - Jörg-Peter Schnitzler
- Research Unit Environmental Simulation (EUS), Helmholtz Zentrum München, Institute of Biochemical Plant Pathology, D-85764 Neuherberg, Germany
| | - Kjell Sergeant
- GreenTech Innovation Centre, Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Scienceand Technology (LIST), L-4362 Esch-sur-Alzette, Luxembourg
| | - Jana Barbro Winkler
- Research Unit Environmental Simulation (EUS), Helmholtz Zentrum München, Institute of Biochemical Plant Pathology, D-85764 Neuherberg, Germany
| | - Simone Zorzan
- GreenTech Innovation Centre, Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Scienceand Technology (LIST), L-4362 Esch-sur-Alzette, Luxembourg
| | - Francesco Loreto
- Department of Biology, University of Naples Federico II, Via Cinthia, 80126 Naples, Naples, Italy
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6
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Vitale E, Velikova V, Tsonev T, Costanzo G, Paradiso R, Arena C. Manipulation of light quality is an effective tool to regulate photosynthetic capacity and fruit antioxidant properties of Solanum lycopersicum L. cv. 'Microtom' in a controlled environment. PeerJ 2022; 10:e13677. [PMID: 35795173 PMCID: PMC9252183 DOI: 10.7717/peerj.13677] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 06/13/2022] [Indexed: 01/17/2023] Open
Abstract
Light quality plays an essential role in setting plant structural and functional traits, including antioxidant compounds. This paper aimed to assess how manipulating the light spectrum during growth may regulate the photosynthetic activity and fruit bioactive compound synthesis in Solanum lycopersicum L. cv. 'Microtom' to improve plant physiological performance and fruit nutritional value. Plants were cultivated under three light quality regimes: red-green-blue LEDs (RGB), red-blue LEDs (RB) and white fluorescent lamps (FL), from sowing to fruit ripening. Leaf functional traits, photosynthetic efficiency, Rubisco and D1 protein expression, and antioxidant production in fruits were analyzed. Compared to FL, RGB and RB regimes reduced height and increased leaf number and specific leaf area, enhancing plant dwarf growth. The RGB regime improved photosynthesis and stomatal conductance despite lower biomass, favoring Rubisco synthesis and carboxylation rate than RB and FL regimes. The RB light produced plants with fewer flowers and fruits with a lower ascorbic acid amount but the highest polyphenol content, antioxidant capacity and SOD and CAT activities. Our data indicate that the high percentage of the green wavelength in the RGB regime promoted photosynthesis and reduced plant reproductive capacity compared to FL and RB. Conversely, the RB regime was the best in favoring the production of health-promoting compounds in tomato berries.
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Affiliation(s)
| | - Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Tsonko Tsonev
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Giulia Costanzo
- Department of Biology, University of Naples Federico II, Naples, Italy
| | - Roberta Paradiso
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Carmen Arena
- Department of Biology, University of Naples Federico II, Naples, Italy,BAT Center-Center for Studies on Bioinspired Agro-Environmental Technology, Portici, Italy
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Walter GM, Clark J, Cristaudo A, Terranova D, Nevado B, Catara S, Paunov M, Velikova V, Filatov D, Cozzolino S, Hiscock SJ, Bridle JR. Adaptive divergence generates distinct plastic responses in two closely related Senecio species. Evolution 2022; 76:1229-1245. [PMID: 35344205 PMCID: PMC9322604 DOI: 10.1111/evo.14478] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 01/18/2022] [Indexed: 01/22/2023]
Abstract
The evolution of plastic responses to external cues allows species to maintain fitness in response to the environmental variations they regularly experience. However, it remains unclear how plasticity evolves during adaptation. To test whether distinct patterns of plasticity are associated with adaptive divergence, we quantified plasticity for two closely related but ecologically divergent Sicilian daisy species (Senecio, Asteraceae). We sampled 40 representative genotypes of each species from their native range on Mt. Etna and then reciprocally transplanted multiple clones of each genotype into four field sites along an elevational gradient that included the native elevational range of each species, and two intermediate elevations. At each elevation, we quantified survival and measured leaf traits that included investment (specific leaf area), morphology, chlorophyll fluorescence, pigment content, and gene expression. Traits and differentially expressed genes that changed with elevation in one species often showed little changes in the other species, or changed in the opposite direction. As evidence of adaptive divergence, both species performed better at their native site and better than the species from the other habitat. Adaptive divergence is, therefore, associated with the evolution of distinct plastic responses to environmental variation, despite these two species sharing a recent common ancestor.
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Affiliation(s)
- Greg M. Walter
- School of Biological SciencesUniversity of BristolUK,School of Biological SciencesMonash UniversityMelbourneAustralia
| | - James Clark
- School of Biological SciencesUniversity of BristolUK,Department of Plant SciencesUniversity of OxfordOxfordUK
| | - Antonia Cristaudo
- Department of Biological, Geological, and Environmental SciencesUniversity of CataniaCataniaItaly
| | - Delia Terranova
- Department of Biological, Geological, and Environmental SciencesUniversity of CataniaCataniaItaly
| | - Bruno Nevado
- Department of Plant SciencesUniversity of OxfordOxfordUK,Center of Ecology, Evolution, and Environmental ChangesUniversidade de LisboaLisboaPortugal
| | - Stefania Catara
- Department of Biological, Geological, and Environmental SciencesUniversity of CataniaCataniaItaly
| | - Momchil Paunov
- Faculty of BiologySofia University St. Kliment OhridskiSofiaBulgaria
| | - Violeta Velikova
- Bulgarian Academy of Sciences, Institute of Plant Physiology and GeneticsSofiaBulgaria
| | - Dmitry Filatov
- Department of Plant SciencesUniversity of OxfordOxfordUK
| | | | | | - Jon R. Bridle
- School of Biological SciencesUniversity of BristolUK,Department of Genetics, Evolution, and EnvironmentUniversity College LondonLondonUK
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8
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Petrova N, Paunov M, Petrov P, Velikova V, Goltsev V, Krumova S. Polymer-Modified Single-Walled Carbon Nanotubes Affect Photosystem II Photochemistry, Intersystem Electron Transport Carriers and Photosystem I End Acceptors in Pea Plants. Molecules 2021; 26:5958. [PMID: 34641502 PMCID: PMC8512794 DOI: 10.3390/molecules26195958] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/26/2021] [Accepted: 09/27/2021] [Indexed: 11/16/2022] Open
Abstract
Single-walled carbon nanotubes (SWCNT) have recently been attracting the attention of plant biologists as a prospective tool for modulation of photosynthesis in higher plants. However, the exact mode of action of SWCNT on the photosynthetic electron transport chain remains unknown. In this work, we examined the effect of foliar application of polymer-grafted SWCNT on the donor side of photosystem II, the intersystem electron transfer chain and the acceptor side of photosystem I. Analysis of the induction curves of chlorophyll fluorescence via JIP test and construction of differential curves revealed that SWCNT concentrations up to 100 mg/L did not affect the photosynthetic electron transport chain. SWCNT concentration of 300 mg/L had no effect on the photosystem II donor side but provoked inactivation of photosystem II reaction centres and slowed down the reduction of the plastoquinone pool and the photosystem I end acceptors. Changes in the modulated reflection at 820 nm, too, indicated slower re-reduction of photosystem I reaction centres in SWCNT-treated leaves. We conclude that SWCNT are likely to be able to divert electrons from the photosynthetic electron transport chain at the level of photosystem I end acceptors and plastoquinone pool in vivo. Further research is needed to unequivocally prove if the observed effects are due to specific interaction between SWCNT and the photosynthetic apparatus.
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Affiliation(s)
- Nia Petrova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria;
| | - Momchil Paunov
- Faculty of Biology, Sofia University ‘St. Kliment Ohridski’, 8 Dragan Tsankov Blvd., 1164 Sofia, Bulgaria; (M.P.); (V.G.)
| | - Petar Petrov
- Institute of Polymers, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 103-A, 1113 Sofia, Bulgaria;
| | - Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Vasilij Goltsev
- Faculty of Biology, Sofia University ‘St. Kliment Ohridski’, 8 Dragan Tsankov Blvd., 1164 Sofia, Bulgaria; (M.P.); (V.G.)
| | - Sashka Krumova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria;
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Velikova V, Petrova N, Kovács L, Petrova A, Koleva D, Tsonev T, Taneva S, Petrov P, Krumova S. Single-Walled Carbon Nanotubes Modify Leaf Micromorphology, Chloroplast Ultrastructure and Photosynthetic Activity of Pea Plants. Int J Mol Sci 2021; 22:4878. [PMID: 34063012 PMCID: PMC8124974 DOI: 10.3390/ijms22094878] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 04/29/2021] [Accepted: 04/30/2021] [Indexed: 02/07/2023] Open
Abstract
Single-walled carbon nanotubes (SWCNTs) emerge as promising novel carbon-based nanoparticles for use in biomedicine, pharmacology and precision agriculture. They were shown to penetrate cell walls and membranes and to physically interact and exchange electrons with photosynthetic complexes in vitro. Here, for the first time, we studied the concentration-dependent effect of foliar application of copolymer-grafted SWCNTs on the structural and functional characteristics of intact pea plants. The lowest used concentration of 10 mg L-1 did not cause any harmful effects on the studied leaf characteristics, while abundant epicuticular wax generation on both leaf surfaces was observed after 300 mg L-1 treatment. Swelling of both the granal and the stromal regions of thylakoid membranes was detected after application of 100 mg L-1 and was most pronounced after 300 mg L-1. Higher SWCNT doses lead to impaired photosynthesis in terms of lower proton motive force generation, slower generation of non-photochemical quenching and reduced zeaxanthin content; however, the photosystem II function was largely preserved. Our results clearly indicate that SWCNTs affect the photosynthetic apparatus in a concentration-dependent manner. Low doses (10 mg L-1) of SWCNTs appear to be a safe suitable object for future development of nanocarriers for substances that are beneficial for plant growth.
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Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad Georgi Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria;
| | - Nia Petrova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad Georgi Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria; (N.P.); (T.T.); (S.T.)
| | - László Kovács
- Biological Research Center, Institute of Plant Biology, Temesvári krt. 62, 6726 Szeged, Hungary;
| | - Asya Petrova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad Georgi Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria;
| | - Dimitrina Koleva
- Faculty of Biology, Sofia University “St. Kliment Ohridski”, 8 Dragan Tsankov, 1164 Sofia, Bulgaria;
| | - Tsonko Tsonev
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad Georgi Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria; (N.P.); (T.T.); (S.T.)
| | - Stefka Taneva
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad Georgi Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria; (N.P.); (T.T.); (S.T.)
| | - Petar Petrov
- Institute of Polymers, Bulgarian Academy of Sciences, Acad Georgi Bonchev Str. Bl. 103, 1113 Sofia, Bulgaria;
| | - Sashka Krumova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad Georgi Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria; (N.P.); (T.T.); (S.T.)
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10
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Vitale E, Velikova V, Tsonev T, Ferrandino I, Capriello T, Arena C. The Interplay between Light Quality and Biostimulant Application Affects the Antioxidant Capacity and Photosynthetic Traits of Soybean ( Glycine max L. Merrill). Plants (Basel) 2021; 10:plants10050861. [PMID: 33923330 PMCID: PMC8144973 DOI: 10.3390/plants10050861] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 04/21/2021] [Accepted: 04/21/2021] [Indexed: 05/03/2023]
Abstract
This paper evaluates the combined effect of biostimulant and light quality on bioactive compound production and seedling growth of soybean (Glycine max L. Merrill) plants. Germinated seeds pre-treated with different concentrations (0.01%, 0.05%, 0.5%) of an amino acid-based biostimulant were grown for 4 days at the dark (D), white fluorescent light (FL), full-spectrum LED (FS), and red-blue (RB) light. Potential changes in the antioxidant content of sprouts were evaluated. Part of the sprouts was left to grow at FL, FS, and RB light regimes for 24 days to assess modifications in plants' anatomical and physiological traits during the early developmental plant stage. The seed pre-treatment with all biostimulant concentrations significantly increased sprout antioxidant compounds, sugar, and protein content compared to the control (seeds treated with H2O). The positive effect on bioactive compounds was improved under FS and RB compared to D and FL light regimes. At the seedling stage, 0.05% was the only concentration of biostimulant effective in increasing the specific leaf area (SLA) and photosynthetic efficiency. Compared to FL, the growth under FS and RB light regimes significantly enhanced the beneficial effect of 0.05% on SLA and photosynthesis. This concentration led to leaf thickness increase and shoot/root ratio reduction. Our findings demonstrated that seed pre-treatment with proper biostimulant concentration in combination with specific light regimes during plant development may represent a useful means to modify the bioactive compound amount and leaf structural and photosynthetic traits.
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Affiliation(s)
- Ermenegilda Vitale
- Department of Biology, University of Naples Federico II, Via Cinthia 26, 80126 Naples, Italy; (E.V.); (I.F.); (T.C.)
| | - Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Street bl. 21, 1113 Sofia, Bulgaria
- Correspondence: (V.V.); (C.A.)
| | - Tsonko Tsonev
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Street bl. 21, 1113 Sofia, Bulgaria;
| | - Ida Ferrandino
- Department of Biology, University of Naples Federico II, Via Cinthia 26, 80126 Naples, Italy; (E.V.); (I.F.); (T.C.)
- BAT Center-Interuniversity Center for Studies on Bioinspired Agro-Environmental Technology, 80055 Portici, Italy
| | - Teresa Capriello
- Department of Biology, University of Naples Federico II, Via Cinthia 26, 80126 Naples, Italy; (E.V.); (I.F.); (T.C.)
| | - Carmen Arena
- Department of Biology, University of Naples Federico II, Via Cinthia 26, 80126 Naples, Italy; (E.V.); (I.F.); (T.C.)
- BAT Center-Interuniversity Center for Studies on Bioinspired Agro-Environmental Technology, 80055 Portici, Italy
- Correspondence: (V.V.); (C.A.)
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11
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Doneva D, Pál M, Brankova L, Szalai G, Tajti J, Khalil R, Ivanovska B, Velikova V, Misheva S, Janda T, Peeva V. The effects of putrescine pre-treatment on osmotic stress responses in drought-tolerant and drought-sensitive wheat seedlings. Physiol Plant 2021; 171:200-216. [PMID: 32548914 DOI: 10.1111/ppl.13150] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 05/24/2020] [Accepted: 06/05/2020] [Indexed: 06/11/2023]
Abstract
Recent studies have demonstrated that exogenous polyamines have protective effects under various stress condition. A broader understanding of the role of the polyamine pool fine regulation and the alterations of polyamine-related physiological processes could be obtained by comparing the stress effects in different genotypes. In this study, the impact of pre-treatment with putrescine in response to osmotic stress was investigated in the drought-tolerant Katya and drought-sensitive Zora wheat (Triticum aestivum) cultivars. Photosynthetic performance, in vivo thermoluminescence emission from leaves, leaf temperature, polyamine and salicylic acid levels, contents of osmoprotectants, and activities of antioxidant enzymes in the leaves were investigated not only to reveal differences in the physiological processes associated to drought tolerance, but to highlight the modulating strategies of polyamine metabolism between a drought-tolerant and a drought-sensitive wheat genotype. Results showed that the tolerance of Katya under osmotic stress conditions was characterized by higher photosynthetic ability, stable charge separation across the thylakoid membrane in photosystem II, higher proline accumulation and antioxidant activity. Thermoluminescence also revealed differences between the two varieties - a downshift of the B band and an increase of the afterglow band under osmotic stress in Zora, providing original complementary information to leaf photosynthesis. Katya variety exhibited higher constitutive levels of the signaling molecules putrescine and salicylic acid compared to the sensitive Zora. However, responses to exogenous putrescine were more advantageous for the sensitive variety under PEG treatment, which may be in relation with the decreased catabolism of polyamines, suggesting the increased need for polyamine under stress conditions.
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Affiliation(s)
- Dilyana Doneva
- Department of Plant Ecophysiology, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria
| | - Magda Pál
- Department of Plant Physiology, Agricultural Institute, Centre for Agricultural Research, Martonvásár, 2462, Hungary
| | - Liliana Brankova
- Department of Plant Ecophysiology, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria
| | - Gabriella Szalai
- Department of Plant Physiology, Agricultural Institute, Centre for Agricultural Research, Martonvásár, 2462, Hungary
| | - Judit Tajti
- Department of Plant Physiology, Agricultural Institute, Centre for Agricultural Research, Martonvásár, 2462, Hungary
| | - Radwan Khalil
- Botany Department, Faculty of Science, Benha University, Benha, 13518, Egypt
| | - Beti Ivanovska
- Department of Plant Physiology, Agricultural Institute, Centre for Agricultural Research, Martonvásár, 2462, Hungary
| | - Violeta Velikova
- Department of Plant Ecophysiology, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria
| | - Svetlana Misheva
- Department of Plant Ecophysiology, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria
| | - Tibor Janda
- Department of Plant Physiology, Agricultural Institute, Centre for Agricultural Research, Martonvásár, 2462, Hungary
| | - Violeta Peeva
- Department of Plant Ecophysiology, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria
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12
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Velikova V, Arena C, Izzo LG, Tsonev T, Koleva D, Tattini M, Roeva O, De Maio A, Loreto F. Functional and Structural Leaf Plasticity Determine Photosynthetic Performances during Drought Stress and Recovery in Two Platanus orientalis Populations from Contrasting Habitats. Int J Mol Sci 2020; 21:E3912. [PMID: 32486179 PMCID: PMC7312932 DOI: 10.3390/ijms21113912] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 05/23/2020] [Accepted: 05/28/2020] [Indexed: 11/25/2022] Open
Abstract
In the context of climatic change, more severe and long-lasting droughts will modify the fitness of plants, with potentially worse consequences on the relict trees. We have investigated the leaf phenotypic (anatomical, physiological and biochemical) plasticity in well-watered, drought-stressed and re-watered plants of two populations of Platanus orientalis, an endangered species in the west of the Mediterranean area. The two populations originated in contrasting climate (drier and warmer, Italy (IT) population; more humid and colder, Bulgaria (BG) population). The IT control plants had thicker leaves, enabling them to maintain higher leaf water content in the dry environment, and more spongy parenchyma, which could improve water conductivity of these plants and may result in easier CO2 diffusion than in BG plants. Control BG plants were also characterized by higher photorespiration and leaf antioxidants compared to IT plants. BG plants responded to drought with greater leaf thickness shrinkage. Drought also caused substantial reduction in photosynthetic parameters of both IT and BG plants. After re-watering, photosynthesis did not fully recover in either of the two populations. However, IT leaves became thicker, while photorespiration in BG plants further increased, perhaps indicating sustained activation of defensive mechanisms. Overall, our hypothesis, that plants with a fragmented habitat (i.e., the IT population) lose phenotypic plasticity but acquire traits allowing better resistance to the climate where they became adapted, remains confirmed.
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Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. bl. 21, Sofia 1113, Bulgaria
| | - Carmen Arena
- Department of Biology, University of Naples Federico II, Via Cinthia, 80126 Naples, Italy; (C.A.); (A.D.M.)
| | - Luigi Gennaro Izzo
- Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, 80055 Portici, Italy;
| | - Tsonko Tsonev
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, Sofia 1113, Bulgaria; (T.T.); (O.R.)
| | | | - Massimiliano Tattini
- Institute for Sustainable Plant Protection, Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), I-50019 Sesto Fiorentino (Florence), Italy;
| | - Olympia Roeva
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, Sofia 1113, Bulgaria; (T.T.); (O.R.)
| | - Anna De Maio
- Department of Biology, University of Naples Federico II, Via Cinthia, 80126 Naples, Italy; (C.A.); (A.D.M.)
| | - Francesco Loreto
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), 00185 Rome, Italy
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13
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Velikova V, Tsonev T, Tattini M, Arena C, Krumova S, Koleva D, Peeva V, Stojchev S, Todinova S, Izzo LG, Brunetti C, Stefanova M, Taneva S, Loreto F. Physiological and structural adjustments of two ecotypes of Platanus orientalis L. from different habitats in response to drought and re-watering. Conserv Physiol 2018; 6:coy073. [PMID: 30591840 PMCID: PMC6301291 DOI: 10.1093/conphys/coy073] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 11/02/2018] [Accepted: 11/27/2018] [Indexed: 05/23/2023]
Abstract
Platanus orientalis covers a very fragmented area in Europe and, at the edge of its natural distribution, is considered a relic endangered species near extinction. In our study, it was hypothesized that individuals from the edge of the habitat, with stronger climate constrains (drier and warmer environment, Italy, IT ecotype), developed different mechanisms of adaptation than those growing under optimal conditions at the center of the habitat (more humid and colder environment, Bulgaria, BG ecotype). Indeed, the two P. orientalis ecotypes displayed physiological, structural and functional differences already under control (unstressed) conditions. Adaptation to a dry environment stimulated constitutive isoprene emission, determined active stomatal behavior, and modified chloroplast ultrastructure, ultimately allowing more effective use of absorbed light energy for photochemistry. When exposed to short-term acute drought stress, IT plants showed active stomatal control that enhanced instantaneous water use efficiency, and stimulation of isoprene emission that sustained photochemistry and reduced oxidative damages to membranes, as compared to BG plants. None of the P. orientalis ecotypes recovered completely from drought stress after re-watering, confirming the sensitivity of this mesophyte to drought. Nevertheless, the IT ecotype showed less damage and better stability at the level of chloroplast membrane parameters when compared to the BG ecotype, which we interpret as possible adaptation to hostile environments and improved capacity to cope with future, likely more recurrent, drought stress.
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Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. bl. 21, Sofia, Bulgaria
| | - Tsonko Tsonev
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, Sofia, Bulgaria
| | - Massimiliano Tattini
- Institute for Sustainable Plant Protection, Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Sesto Fiorentino (Florence), Italy
| | - Carmen Arena
- Department of Biology, University of Naples Federico II, Via Cinthia, Naples, Italy
| | - Sashka Krumova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, Sofia, Bulgaria
| | | | - Violeta Peeva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. bl. 21, Sofia, Bulgaria
| | - Svetoslav Stojchev
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, Sofia, Bulgaria
| | - Svetla Todinova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, Sofia, Bulgaria
| | - Luigi Gennaro Izzo
- Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, Portici, Italy
| | - Cecilia Brunetti
- Department of Biology, Agriculture and Food Sciences, Trees and Timber Institute, The National Research Council of Italy (CNR), Sesto Fiorentino (Florence), Italy
| | | | - Stefka Taneva
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 21, Sofia, Bulgaria
| | - Francesco Loreto
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Rome, Italy
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14
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Petrova N, Koleva P, Velikova V, Tsonev T, Andreeva T, Taneva S, Krumova S, Danova K. Relations between photosynthetic performance and polyphenolics productivity of Artemisia alba Turra in in vitro tissue cultures. Int J Bioautomation 2018. [DOI: 10.7546/ijba.2018.22.1.73-82] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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15
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Li M, Xu J, Algarra Alarcon A, Carlin S, Barbaro E, Cappellin L, Velikova V, Vrhovsek U, Loreto F, Varotto C. In Planta Recapitulation of Isoprene Synthase Evolution from Ocimene Synthases. Mol Biol Evol 2017; 34:2583-2599. [PMID: 28637270 PMCID: PMC5850473 DOI: 10.1093/molbev/msx178] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Isoprene is the most abundant biogenic volatile hydrocarbon compound naturally emitted by plants and plays a major role in atmospheric chemistry. It has been proposed that isoprene synthases (IspS) may readily evolve from other terpene synthases, but this hypothesis has not been experimentally investigated. We isolated and functionally validated in Arabidopsis the first isoprene synthase gene, AdoIspS, from a monocotyledonous species (Arundo donax L., Poaceae). Phylogenetic reconstruction indicates that AdoIspS and dicots isoprene synthases most likely originated by parallel evolution from TPS-b monoterpene synthases. Site-directed mutagenesis demonstrated invivo the functional and evolutionary relevance of the residues considered diagnostic for IspS function. One of these positions was identified by saturating mutagenesis as a major determinant of substrate specificity in AdoIspS able to cause invivo a dramatic change in total volatile emission from hemi- to monoterpenes and supporting evolution of isoprene synthases from ocimene synthases. The mechanism responsible for IspS neofunctionalization by active site size modulation by a single amino acid mutation demonstrated in this study might be general, as the very same amino acidic position is implicated in the parallel evolution of different short-chain terpene synthases from both angiosperms and gymnosperms. Based on these results, we present a model reconciling in a unified conceptual framework the apparently contrasting patterns previously observed for isoprene synthase evolution in plants. These results indicate that parallel evolution may be driven by relatively simple biophysical constraints, and illustrate the intimate molecular evolutionary links between the structural and functional bases of traits with global relevance.
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Affiliation(s)
- Mingai Li
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige (TN), Italy
| | - Jia Xu
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige (TN), Italy
- Dipartimento di Biologia, Università di Padova, Padova, Italy
| | - Alberto Algarra Alarcon
- Department of Food Quality and Nutrition, Research and Innovation Centre, San Michele all’Adige (TN), Italy
- Institute of Ecology, University of Innsbruck, Innsbruck, Austria
| | - Silvia Carlin
- Department of Food Quality and Nutrition, Research and Innovation Centre, San Michele all’Adige (TN), Italy
| | - Enrico Barbaro
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige (TN), Italy
| | - Luca Cappellin
- Department of Food Quality and Nutrition, Research and Innovation Centre, San Michele all’Adige (TN), Italy
| | - Violeta Velikova
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige (TN), Italy
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Urska Vrhovsek
- Department of Food Quality and Nutrition, Research and Innovation Centre, San Michele all’Adige (TN), Italy
| | - Francesco Loreto
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Rome, Italy
| | - Claudio Varotto
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige (TN), Italy
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16
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Ahrar M, Doneva D, Tattini M, Brunetti C, Gori A, Rodeghiero M, Wohlfahrt G, Biasioli F, Varotto C, Loreto F, Velikova V. Phenotypic differences determine drought stress responses in ecotypes of Arundo donax adapted to different environments. J Exp Bot 2017; 68:2439-2451. [PMID: 28449129 DOI: 10.1093/jxb/erx125] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [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: 06/07/2023]
Abstract
Arundo donax has been identified as an important biomass and biofuel crop. Yet, there has been little research on photosynthetic and metabolic traits, which sustain the high productivity of A. donax under drought conditions. This study determined phenotypic differences between two A. donax ecotypes coming from stands with contrasting adaptation to dry climate. We hypothesized that the Bulgarian (BG) ecotype, adapted to drier conditions, exhibits greater drought tolerance than the Italian (IT) ecotype, adapted to a more mesic environment. Under well-watered conditions the BG ecotype was characterized by higher photosynthesis, mesophyll conductance, intrinsic water use efficiency, PSII efficiency, isoprene emission rate and carotenoids, whereas the IT ecotype showed higher levels of hydroxycinnamates. Photosynthesis of water-stressed plants was mainly limited by diffusional resistance to CO2 in BG, and by biochemistry in IT. Recovery of photosynthesis was more rapid and complete in BG than in IT, which may indicate better stability of the photosynthetic apparatus associated to enhanced induction of volatile and non-volatile isoprenoids and phenylpropanoid biosynthesis. This study shows that a large phenotypic plasticity among A. donax ecotypes exists, and may be exploited to compensate for the low genetic variability of this species when selecting plant productivity in constrained environments.
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Affiliation(s)
- Mastaneh Ahrar
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
- Institute of Ecology, University of Innsbruck, Innsbruck, Austria
| | - Dilyana Doneva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Massimiliano Tattini
- The National Research Council of Italy (CNR), Institute for Sustainable Plant Protection, Sesto Fiorentino, Florence, Italy
| | - Cecilia Brunetti
- The National Research Council of Italy (CNR), Trees and Timber Institute, Sesto Fiorentino, Florence, Italy
- Department of Plant, Soil and Environmental Sciences, University of Florence, Florence, Italy
| | - Antonella Gori
- Department of Agri-Food Production and Environmental Sciences, University of Florence, Florence, Italy
| | - Mirco Rodeghiero
- Department of Sustainable Agro-Ecosystems and Bioresources, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
| | - Georg Wohlfahrt
- Institute of Ecology, University of Innsbruck, Innsbruck, Austria
| | - Franco Biasioli
- Department of Food Quality and Nutrition, Volatile Compound Facility, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
| | - Claudio Varotto
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
| | - Francesco Loreto
- The National Research Council of Italy (CNR), Department of Biology, Agriculture and Food Science, Rome, Italy
| | - Violeta Velikova
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria
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17
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Baldacchini C, Castanheiro A, Maghakyan N, Sgrigna G, Verhelst J, Alonso R, Amorim JH, Bellan P, Bojović DĐ, Breuste J, Bühler O, Cântar IC, Cariñanos P, Carriero G, Churkina G, Dinca L, Esposito R, Gawroński SW, Kern M, Le Thiec D, Moretti M, Ningal T, Rantzoudi EC, Sinjur I, Stojanova B, Aničić Urošević M, Velikova V, Živojinović I, Sahakyan L, Calfapietra C, Samson R. How Does the Amount and Composition of PM Deposited on Platanus acerifolia Leaves Change Across Different Cities in Europe? Environ Sci Technol 2017; 51:1147-1156. [PMID: 28060487 DOI: 10.1021/acs.est.6b04052] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Particulate matter (PM) deposited on Platanus acerifolia tree leaves has been sampled in the urban areas of 28 European cities, over 20 countries, with the aim of testing leaf deposited particles as indicator of atmospheric PM concentration and composition. Leaves have been collected close to streets characterized by heavy traffic and within urban parks. Leaf surface density, dimensions, and elemental composition of leaf deposited particles have been compared with leaf magnetic content, and discussed in connection with air quality data. The PM quantity and size were mainly dependent on the regional background concentration of particles, while the percentage of iron-based particles emerged as a clear marker of traffic-related pollution in most of the sites. This indicates that Platanus acerifolia is highly suitable to be used in atmospheric PM monitoring studies and that morphological and elemental characteristics of leaf deposited particles, joined with the leaf magnetic content, may successfully allow urban PM source apportionment.
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Affiliation(s)
- Chiara Baldacchini
- Institute of Agro Environmental and Forest Biology, National Research Council (IBAF-CNR), Via Marconi 2, Porano 05010, & Via Castellino 111, Napoli 80131, Italy
| | - Ana Castanheiro
- Laboratory of Environmental and Urban Ecology, Department of Bioscience Engineering, University of Antwerp , Groenenborgerlaan 171, Antwerp 2020, Belgium
| | - Nairuhi Maghakyan
- Center for Ecological-Noosphere Studies, National Academy of Sciences of Armenia , Abovyan 68, Yerevan 0025, Armenia
| | - Gregorio Sgrigna
- Institute of Agro Environmental and Forest Biology, National Research Council (IBAF-CNR), Via Marconi 2, Porano 05010, & Via Castellino 111, Napoli 80131, Italy
| | - Jolien Verhelst
- Laboratory of Environmental and Urban Ecology, Department of Bioscience Engineering, University of Antwerp , Groenenborgerlaan 171, Antwerp 2020, Belgium
| | - Rocío Alonso
- Ecotoxicology of Air Pollution, CIEMAT , Avda. Complutense 22, edif. 70, Madrid 28040, Spain
| | - Jorge H Amorim
- CESAM and Department of Environment and Planning, University of Aveiro , Aveiro 3810-193, Portugal
| | - Patrick Bellan
- Vegetation Consultant/Landscape Engineer, Båstadsgatan 6a, Malmö 21439, Sweden
| | - Danijela Đunisijević Bojović
- Department for Landscape Architecture and Horticulture, Faculty of Forestry, University of Belgrade , Kneza Višeslava 1, Belgrade, Serbia
| | - Jürgen Breuste
- Department of Geography and Geology, University of Salzburg , Hellbrunnerstr. 34, Salzburg 5020, Austria
| | - Oliver Bühler
- Department of Geosciences and Natural Resource Management, University of Copenhagen , Rolighedsvej 23, Frederiksberg 1958, Denmark
| | - Ilie C Cântar
- National Institute for Research and Development in Forestry "Marin Dracea″, Padurea Verde Alley 8, Timisoara 300310, & B-dul Eroilor 128, Bucharest 077190, Romania
| | - Paloma Cariñanos
- Department of Botany, University of Granada & IISTA-CEAMA, Andalusian Institute for Earth System Research , Av. Mediterraneo, Granada 18071, Spain
| | - Giulia Carriero
- Institute for Sustainable Plant Protection, National Research Council (IPSP-CNR), Via Madonna del Piano 10, Sesto Fiorentino 50019, Italy
| | - Galina Churkina
- Institute for Advanced Sustainability Studies (IASS) , Berlinerstr 130, Potsdam 14467, Germany
| | - Lucian Dinca
- National Institute for Research and Development in Forestry "Marin Dracea″, Padurea Verde Alley 8, Timisoara 300310, & B-dul Eroilor 128, Bucharest 077190, Romania
| | - Raffaela Esposito
- Institute of Agro Environmental and Forest Biology, National Research Council (IBAF-CNR), Via Marconi 2, Porano 05010, & Via Castellino 111, Napoli 80131, Italy
| | - Stanisław W Gawroński
- Laboratory of Basic Research in Horticulture, Faculty of Horticulture, Biotechnology and Landscape Architecture, Warsaw University of Life Sciences , Ul. Nowoursynowska 159, Warsaw 02-776, Poland
| | - Maren Kern
- School of Agricultural, Forest and Food Sciences HAFL, Bern University of Applied Sciences , Länggasse 85, Zollikofen 3052, Switzerland
| | - Didier Le Thiec
- UMR EEF, INRA, Université de Lorraine , Champenoux 54280, France
| | - Marco Moretti
- Swiss Federal Research Institute WSL, Biodiversity and Conservation Biology, Zürcherstrasse 111, Birmensdorf 8903, Switzerland
| | - Tine Ningal
- School of Geography, University College of Dublin , Belfield, Dublin 4, Ireland
| | - Eleni C Rantzoudi
- Department of Forestry and Management of Environment and Natural Resources, Dimocritus University of Thrace , Pantazidou 193, Orestiada 68200, Greece
| | - Iztok Sinjur
- Slovenian Forestry Institute , Večna pot 2, Ljubljana 1000, Slovenia
| | - Biljana Stojanova
- Department of Urban Greenery, Public Enterprise "Parks and Greenery", Bul. Ilindenska 104, Skopje 1000, Macedonia
| | - Mira Aničić Urošević
- Institute of Physics, University of Belgrade , Pregrevica 118, Belgrade 11080, Serbia
| | - Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences , Sofia 1113, Bulgaria
| | - Ivana Živojinović
- European Forest Institute Central-East and South-East European Regional Office (EFICEEC-EFISEE), University of Natural Resources and Life Sciences , Vienna, Feistmantelstrasse 4, Vienna 1180, Austria
| | - Lilit Sahakyan
- Center for Ecological-Noosphere Studies, National Academy of Sciences of Armenia , Abovyan 68, Yerevan 0025, Armenia
| | - Carlo Calfapietra
- Institute of Agro Environmental and Forest Biology, National Research Council (IBAF-CNR), Via Marconi 2, Porano 05010, & Via Castellino 111, Napoli 80131, Italy
| | - Roeland Samson
- Laboratory of Environmental and Urban Ecology, Department of Bioscience Engineering, University of Antwerp , Groenenborgerlaan 171, Antwerp 2020, Belgium
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18
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Velikova V, Brunetti C, Tattini M, Doneva D, Ahrar M, Tsonev T, Stefanova M, Ganeva T, Gori A, Ferrini F, Varotto C, Loreto F. Physiological significance of isoprenoids and phenylpropanoids in drought response of Arundinoideae species with contrasting habitats and metabolism. Plant Cell Environ 2016; 39:2185-97. [PMID: 27351898 DOI: 10.1111/pce.12785] [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: 05/09/2016] [Revised: 06/17/2016] [Accepted: 06/20/2016] [Indexed: 05/26/2023]
Abstract
Physiological, biochemical and morpho-anatomical traits that determine the phenotypic plasticity of plants under drought were tested in two Arundinoideae with contrasting habitats, growth traits and metabolism: the fast-growing Arundo donax, which also is a strong isoprene emitter, and the slow-growing Hakonechloa macra that does not invest on isoprene biosynthesis. In control conditions, A. donax displayed not only higher photosynthesis but also higher concentration of carotenoids and lower phenylpropanoid content than H. macra. In drought-stressed plants, photosynthesis was similarly inhibited in both species, but substantially recovered only in A. donax after rewatering. Decline of photochemical and biochemical parameters, increased concentration of CO2 inside leaves, and impairment of chloroplast ultrastructure were only observed in H. macra indicating damage of photosynthetic machinery under drought. It is suggested that volatile and non-volatile isoprenoids produced by A. donax efficiently preserve the chloroplasts from transient drought damage, while H. macra invests on phenylpropanoids that are less efficient in preserving photosynthesis but likely offer better antioxidant protection under prolonged stress.
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Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria.
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy.
| | - Cecilia Brunetti
- Trees and Timber Institute, The National Research Council of Italy (CNR), Via Madonna del Piano 10, Sesto Fiorentino, 50019, Florence, Italy
- Department of Plant, Soil and Environmental Sciences, University of Florence, Viale delle Idee 30, Sesto Fiorentino, 50019, Florence, Italy
| | - Massimiliano Tattini
- Institute for Sustainable Plant Protection, Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Sesto Fiorentino, 50019, Florence, Italy
| | - Dilyana Doneva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
| | - Mastaneh Ahrar
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
- Institute of Ecology, University of Innsbruck, Austria
| | - Tsonko Tsonev
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
| | | | - Tsveta Ganeva
- Faculty of Biology, Sofia University, 1113, Sofia, Bulgaria
| | - Antonella Gori
- Department of Plant, Soil and Environmental Sciences, University of Florence, Viale delle Idee 30, Sesto Fiorentino, 50019, Florence, Italy
| | - Francesco Ferrini
- Department of Plant, Soil and Environmental Sciences, University of Florence, Viale delle Idee 30, Sesto Fiorentino, 50019, Florence, Italy
| | - Claudio Varotto
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
| | - Francesco Loreto
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), 00185, Rome, Italy
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Vanzo E, Merl-Pham J, Velikova V, Ghirardo A, Lindermayr C, Hauck SM, Bernhardt J, Riedel K, Durner J, Schnitzler JP. Modulation of Protein S-Nitrosylation by Isoprene Emission in Poplar. Plant Physiol 2016; 170:1945-61. [PMID: 26850277 PMCID: PMC4825136 DOI: 10.1104/pp.15.01842] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 02/04/2016] [Indexed: 05/18/2023]
Abstract
Researchers have been examining the biological function(s) of isoprene in isoprene-emitting (IE) species for two decades. There is overwhelming evidence that leaf-internal isoprene increases the thermotolerance of plants and protects them against oxidative stress, thus mitigating a wide range of abiotic stresses. However, the mechanisms of abiotic stress mitigation by isoprene are still under debate. Here, we assessed the impact of isoprene on the emission of nitric oxide (NO) and the S-nitroso-proteome of IE and non-isoprene-emitting (NE) gray poplar (Populus × canescens) after acute ozone fumigation. The short-term oxidative stress induced a rapid and strong emission of NO in NE compared with IE genotypes. Whereas IE and NE plants exhibited under nonstressful conditions only slight differences in their S-nitrosylation pattern, the in vivo S-nitroso-proteome of the NE genotype was more susceptible to ozone-induced changes compared with the IE plants. The results suggest that the nitrosative pressure (NO burst) is higher in NE plants, underlining the proposed molecular dialogue between isoprene and the free radical NO Proteins belonging to the photosynthetic light and dark reactions, the tricarboxylic acid cycle, protein metabolism, and redox regulation exhibited increased S-nitrosylation in NE samples compared with IE plants upon oxidative stress. Because the posttranslational modification of proteins via S-nitrosylation often impacts enzymatic activities, our data suggest that isoprene indirectly regulates the production of reactive oxygen species (ROS) via the control of the S-nitrosylation level of ROS-metabolizing enzymes, thus modulating the extent and velocity at which the ROS and NO signaling molecules are generated within a plant cell.
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Affiliation(s)
- Elisa Vanzo
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
| | - Juliane Merl-Pham
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
| | - Violeta Velikova
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
| | - Andrea Ghirardo
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
| | - Christian Lindermayr
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
| | - Stefanie M Hauck
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
| | - Jörg Bernhardt
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
| | - Katharina Riedel
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
| | - Jörg Durner
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
| | - Jörg-Peter Schnitzler
- Helmholtz Zentrum München, Research Unit Environmental Simulation (E.V., V.V., A.G., J.-P.S.), Institute of Biochemical Plant Pathology (C.L., J.D.), and Research Unit Protein Science (J.M.-P., S.M.H.), D-85764 Neuherberg, Germany;Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria (V.V.); andInstitute for Microbiology, Ernst-Moritz-Arndt University, 17487 Greifswald, Germany (J.B., K.R.)
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Astier J, Loake G, Velikova V, Gaupels F. Editorial: Interplay between NO Signaling, ROS, and the Antioxidant System in Plants. Front Plant Sci 2016; 7:1731. [PMID: 27899934 PMCID: PMC5110556 DOI: 10.3389/fpls.2016.01731] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 11/03/2016] [Indexed: 05/07/2023]
Affiliation(s)
- Jeremy Astier
- Department of Environmental Science, Helmholtz Zentrum München, Institute of Biochemical Plant PathologyNeuherberg, Germany
- *Correspondence: Jeremy Astier
| | - Gary Loake
- Institute of Molecular Plant Sciences, School of Biological Sciences, University of EdinburghEdinburgh, UK
| | - Violeta Velikova
- Photosynthesis - Activity and Regulation, Institute of Plant Physiology and Genetics, Bulgarian Academy of SciencesSofia, Bulgaria
| | - Frank Gaupels
- Department of Environmental Science, Helmholtz Zentrum München, Institute of Biochemical Plant PathologyNeuherberg, Germany
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21
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Fu Y, Poli M, Sablok G, Wang B, Liang Y, La Porta N, Velikova V, Loreto F, Li M, Varotto C. Dissection of early transcriptional responses to water stress in Arundo donax L. by unigene-based RNA-seq. Biotechnol Biofuels 2016; 9:54. [PMID: 26958077 PMCID: PMC4782572 DOI: 10.1186/s13068-016-0471-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 02/22/2016] [Indexed: 05/12/2023]
Abstract
BACKGROUND Arundo donax L. (Poaceae) is considered one of the most promising energy crops in the Mediterranean region because of its high biomass yield and low input requirements, but to date no information on its transcriptional responses to water stress is available. RESULTS We obtained by Illumina-based RNA-seq the whole root and shoot transcriptomes of young A. donax plants subjected to osmotic/water stress with 10 and 20 % polyethylene glycol (PEG; 3 biological replicates/organ/condition corresponding to 18 RNA-Seq libraries), and identified a total of 3034 differentially expressed genes. Blast-based mining of stress-related genes indicated the higher responsivity of roots compared to shoots at the early stages of water stress especially under the milder PEG treatment, with a majority of genes responsive to salt, oxidative, and dehydration stress. Analysis of gene ontology terms underlined the qualitatively different responses between root and shoot tissues. Among the most significantly enriched metabolic pathways identified using a Fisher's exact test with FDR correction, a crucial role was played in both shoots and roots by genes involved in the signaling cascade of abscisic acid. We further identified relatively large organ-specific differences in the patterns of drought-related transcription factor AP2-EREBP, AUX/IAA, MYB, bZIP, C2H2, and GRAS families, which may underlie the transcriptional reprogramming differences between organs. Through comparative analyses with major Poaceae species based on Blast, we finally identified a set of 53 orthologs that can be considered as a core of evolutionary conserved genes important to mediate water stress responses in the family. CONCLUSIONS This study provides the first characterization of A. donax transcriptome in response to water stress, thus shedding novel light at the molecular level on the mechanisms of stress response and adaptation in this emerging bioenergy species. The inventory of early-responsive genes to water stress identified could constitute useful markers of the physiological status of A. donax and be a basis for the improvement of its productivity under water limitation. The full water-stressed A. donax transcriptome is available for Blast-based homology searches through a dedicated web server (http://ecogenomics.fmach.it/arundo/).
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Affiliation(s)
- Yuan Fu
- />Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all’Adige, Trento Italy
- />Dipartimento di Biotecnologie, Università degli Studi di Verona, Verona, Italy
| | - Michele Poli
- />Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all’Adige, Trento Italy
- />Dipartimento di Scienze Agrarie, Università di Bologna, Bologna, Italy
| | - Gaurav Sablok
- />Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all’Adige, Trento Italy
| | - Bo Wang
- />Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all’Adige, Trento Italy
- />Centro di Biologia Integrata (CIBIO), University of Trento, Trento, Italy
| | - Yanchun Liang
- />College of Computer Science and Technology, Jilin University, Changchun, China
| | - Nicola La Porta
- />Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all’Adige, Trento Italy
- />MOUNTFOR Project Centre, European Forest Institute, Via E. Mach 1, 38010 San Michele all’Adige, Trento Italy
| | - Violeta Velikova
- />Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all’Adige, Trento Italy
- />Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Francesco Loreto
- />The National Research Council of Italy (CNR), Department of Biology, Agriculture and Food Sciences, Rome, Italy
| | - Mingai Li
- />Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all’Adige, Trento Italy
| | - Claudio Varotto
- />Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all’Adige, Trento Italy
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22
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Tattini M, Loreto F, Fini A, Guidi L, Brunetti C, Velikova V, Gori A, Ferrini F. Isoprenoids and phenylpropanoids are part of the antioxidant defense orchestrated daily by drought-stressed Platanus × acerifolia plants during Mediterranean summers. New Phytol 2015; 207:613-26. [PMID: 25784134 DOI: 10.1111/nph.13380] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [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: 12/31/2014] [Accepted: 02/19/2015] [Indexed: 05/05/2023]
Abstract
The hypothesis was tested that isoprenoids and phenylpropanoids play a prominent role in countering photooxidative stress, following the depletion of antioxidant enzyme activity in plants exposed to severe drought stress under high solar irradiance and high temperatures. Platanus × acerifolia, a high isoprene-emitting species, was drought-stressed during summer (WS) and compared with unstressed controls (WW). Water relations and photosynthetic parameters were measured under mild, moderate, and severe drought stress conditions. Volatile and nonvolatile isoprenoids, antioxidant enzymes, and phenylpropanoids were measured with the same time course, but in four different periods of the day. Drought severely inhibited photosynthesis, whereas it did not markedly affect the photochemical machinery. Isoprene emission and zeaxanthin concentration were higher in WS than in WW leaves, particularly at mild and moderate stresses, and during the hottest hours of the day. The activities of catalase and ascorbate peroxidase steeply declined during the day, while the activity of guaiacol peroxidase and the concentration of quercetin increased during the day, peaking in the hottest hours in both WW and WS plants. Our experiment reveals a sequence of antioxidants that were used daily by plants to orchestrate defense against oxidative stress induced by drought and associated high light and high temperature. Secondary metabolites seem valuable complements of antioxidant enzymes to counter oxidative stress during the hottest daily hours.
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Affiliation(s)
- Massimiliano Tattini
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Institute for Sustainable Plant Protection, I-50019, Sesto Fiorentino (Florence), Italy
| | - Francesco Loreto
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), I-00185, Rome, Italy
| | - Alessio Fini
- Department of Plant, Soil and Environmental Sciences, University of Florence, I-50019, Sesto Fiorentino (Florence), Italy
| | - Lucia Guidi
- Department of Agriculture, Food and Environment, University of Pisa, I-56124, Pisa, Italy
| | - Cecilia Brunetti
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Institute for Sustainable Plant Protection, I-50019, Sesto Fiorentino (Florence), Italy
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Trees and Timber Institute, I-50019, Sesto Fiorentino (Florence), Italy
| | - Violeta Velikova
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige (Trento), Italy
| | - Antonella Gori
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Institute for Sustainable Plant Protection, I-50019, Sesto Fiorentino (Florence), Italy
- Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), Trees and Timber Institute, I-50019, Sesto Fiorentino (Florence), Italy
| | - Francesco Ferrini
- Department of Plant, Soil and Environmental Sciences, University of Florence, I-50019, Sesto Fiorentino (Florence), Italy
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Velikova V, Müller C, Ghirardo A, Rock TM, Aichler M, Walch A, Schmitt-Kopplin P, Schnitzler JP. Knocking Down of Isoprene Emission Modifies the Lipid Matrix of Thylakoid Membranes and Influences the Chloroplast Ultrastructure in Poplar. Plant Physiol 2015; 168:859-70. [PMID: 25975835 PMCID: PMC4741320 DOI: 10.1104/pp.15.00612] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 05/13/2015] [Indexed: 05/20/2023]
Abstract
Isoprene is a small lipophilic molecule with important functions in plant protection against abiotic stresses. Here, we studied the lipid composition of thylakoid membranes and chloroplast ultrastructure in isoprene-emitting (IE) and nonisoprene-emitting (NE) poplar (Populus × canescens). We demonstrated that the total amount of monogalactosyldiacylglycerols, digalactosyldiacylglycerols, phospholipids, and fatty acids is reduced in chloroplasts when isoprene biosynthesis is blocked. A significantly lower amount of unsaturated fatty acids, particularly linolenic acid in NE chloroplasts, was associated with the reduced fluidity of thylakoid membranes, which in turn negatively affects photosystem II photochemical efficiency. The low photosystem II photochemical efficiency in NE plants was negatively correlated with nonphotochemical quenching and the energy-dependent component of nonphotochemical quenching. Transmission electron microscopy revealed alterations in the chloroplast ultrastructure in NE compared with IE plants. NE chloroplasts were more rounded and contained fewer grana stacks and longer stroma thylakoids, more plastoglobules, and larger associative zones between chloroplasts and mitochondria. These results strongly support the idea that in IE species, the function of this molecule is closely associated with the structural organization and functioning of plastidic membranes.
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Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria (V.V.); andResearch Unit Analytical BioGeoChemistry (C.M., T.M.R., P.S.-K.), Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology (V.V., A.G., J.-P.S.), and Research Unit Analytical Pathology (M.A., A.W.), Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Constanze Müller
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria (V.V.); andResearch Unit Analytical BioGeoChemistry (C.M., T.M.R., P.S.-K.), Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology (V.V., A.G., J.-P.S.), and Research Unit Analytical Pathology (M.A., A.W.), Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Andrea Ghirardo
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria (V.V.); andResearch Unit Analytical BioGeoChemistry (C.M., T.M.R., P.S.-K.), Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology (V.V., A.G., J.-P.S.), and Research Unit Analytical Pathology (M.A., A.W.), Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Theresa Maria Rock
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria (V.V.); andResearch Unit Analytical BioGeoChemistry (C.M., T.M.R., P.S.-K.), Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology (V.V., A.G., J.-P.S.), and Research Unit Analytical Pathology (M.A., A.W.), Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Michaela Aichler
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria (V.V.); andResearch Unit Analytical BioGeoChemistry (C.M., T.M.R., P.S.-K.), Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology (V.V., A.G., J.-P.S.), and Research Unit Analytical Pathology (M.A., A.W.), Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Axel Walch
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria (V.V.); andResearch Unit Analytical BioGeoChemistry (C.M., T.M.R., P.S.-K.), Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology (V.V., A.G., J.-P.S.), and Research Unit Analytical Pathology (M.A., A.W.), Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Philippe Schmitt-Kopplin
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria (V.V.); andResearch Unit Analytical BioGeoChemistry (C.M., T.M.R., P.S.-K.), Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology (V.V., A.G., J.-P.S.), and Research Unit Analytical Pathology (M.A., A.W.), Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Jörg-Peter Schnitzler
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria (V.V.); andResearch Unit Analytical BioGeoChemistry (C.M., T.M.R., P.S.-K.), Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology (V.V., A.G., J.-P.S.), and Research Unit Analytical Pathology (M.A., A.W.), Helmholtz Zentrum München, 85764 Neuherberg, Germany
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Centritto M, Haworth M, Marino G, Pallozzi E, Tsonev T, Velikova V, Nogues I, Loreto F. Isoprene emission aids recovery of photosynthetic performance in transgenic Nicotiana tabacum following high intensity acute UV-B exposure. Plant Sci 2014; 226:82-91. [PMID: 25113453 DOI: 10.1016/j.plantsci.2014.06.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 12/23/2013] [Revised: 04/29/2014] [Accepted: 06/06/2014] [Indexed: 06/03/2023]
Abstract
Isoprene emission by terrestrial plants is believed to play a role in mitigating the effects of abiotic stress on photosynthesis. Ultraviolet-B light (UV-B) induces damage to the photosynthetic apparatus of plants, but the role of isoprene in UV-B tolerance is poorly understood. To investigate this putative protective role, we exposed non-emitting (NE) control and transgenic isoprene emitting (IE) Nicotiana tabacum (tobacco) plants to high intensity UV-B exposure. Methanol emissions increased with UV-B intensity, indicating oxidative damage. However, isoprene emission was unaffected during exposure to UV-B radiation, but declined in the 48 h following UV-B treatment at the highest UV-B intensities of 9 and 15 Wm(-2). Photosynthesis and the performance of photosystem II (PSII) declined to similar extents in IE and NE plants following UV-B exposure, suggesting that isoprene emission did not ameliorate the immediate impact of UV-B on photosynthesis. However, after the stress, photosynthesis and PSII recovered in IE plants, which maintained isoprene formation, but not in NE plants. Recovery of IE plants was also associated with elevated antioxidant levels and cycling; suggesting that both isoprene formation and antioxidant systems contributed to reinstating the integrity and functionality of cellular membranes and photosynthesis following exposure to excessive levels of UV-B radiation.
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Affiliation(s)
- Mauro Centritto
- Trees and Timber Institute, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy.
| | - Matthew Haworth
- Institute of Plant Protection, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy
| | - Giovanni Marino
- Institute of Plant Protection, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy; Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, IS, Italy
| | - Emanuele Pallozzi
- Institute of AgroEnvironmental and Forest Biology, National Research Council, Via Salaria km 29.300, 00015 Monterotondo Scalo, RM, Italy; Department of Forest Environment and Resources, University of Tuscia, Via San Camillo de Lellis, 01100 Viterbo, Italy
| | - Tsonko Tsonev
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Isabel Nogues
- Institute of AgroEnvironmental and Forest Biology, National Research Council, Via Salaria km 29.300, 00015 Monterotondo Scalo, RM, Italy
| | - Francesco Loreto
- Institute of Plant Protection, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy
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Tattini M, Velikova V, Vickers C, Brunetti C, Di Ferdinando M, Trivellini A, Fineschi S, Agati G, Ferrini F, Loreto F. Isoprene production in transgenic tobacco alters isoprenoid, non-structural carbohydrate and phenylpropanoid metabolism, and protects photosynthesis from drought stress. Plant Cell Environ 2014; 37:1950-64. [PMID: 24738622 DOI: 10.1111/pce.12350] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [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: 01/05/2014] [Revised: 03/30/2014] [Accepted: 03/31/2014] [Indexed: 05/03/2023]
Abstract
Isoprene strengthens thylakoid membranes and scavenges stress-induced oxidative species. The idea that isoprene production might also influence isoprenoid and phenylpropanoid pathways under stress conditions was tested. We used transgenic tobacco to compare physiological and biochemical traits of isoprene-emitting (IE) and non-emitting (NE) plants exposed to severe drought and subsequent re-watering. Photosynthesis was less affected by drought in IE than in NE plants, and higher rates were also observed in IE than in NE plants recovering from drought. Isoprene emission was stimulated by mild drought. Under severe drought, isoprene emission declined, and levels of non-volatile isoprenoids, specifically de-epoxidated xanthophylls and abscisic acid (ABA), were higher in IE than in NE plants. Soluble sugars and phenylpropanoids were also higher in IE plants. After re-watering, IE plants maintained higher levels of metabolites, but isoprene emission was again higher than in unstressed plants. We suggest that isoprene production in transgenic tobacco triggered different responses, depending upon drought severity. Under drought, the observed trade-off between isoprene and non-volatile isoprenoids suggests that in IE plants isoprene acts as a short-term protectant, whereas non-volatile isoprenoids protect against severe, long-term damage. After drought, it is suggested that the capacity to emit isoprene might up-regulate production of non-volatile isoprenoids and phenylpropanoids, which may further protect IE leaves.
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Affiliation(s)
- Massimiliano Tattini
- Institute for Plant Protection, Department of Biology, Agriculture and Food Sciences, The National Research Council of Italy (CNR), I-50019, Sesto Fiorentino (Florence), Italy
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26
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Sablok G, Fu Y, Bobbio V, Laura M, Rotino GL, Bagnaresi P, Allavena A, Velikova V, Viola R, Loreto F, Li M, Varotto C. Fuelling genetic and metabolic exploration of C 3 bioenergy crops through the first reference transcriptome of Arundo donax L. Plant Biotechnol J 2014; 12. [PMCID: PMC4285118 DOI: 10.1111/pbi.12159] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The development of inexpensive and highly productive biomass sources of biofuel is a priority in global climate change biology. Arundo donax, also known as the giant reed, is recognized as one of the most promising nonfood bioenergy crops in Europe. Despite its relevance, to date no genomic resources are available to support the characterization of the developmental, adaptive and metabolic traits underlying the high productivity of this nonmodel species. We hereby present the first report on the de novo assembly of bud, culm, leaf and root transcriptomes of A. donax, which can be accessed through a customized BLAST server (http://ecogenomics.fmach.it/arundo/) for mining and exploring the genetic potential of this species. Based on functional annotation and homology comparison to 19 prospective biofuel Poaceae species, we provide the first genomic view of this so far unexplored crop and indicate the model species with highest potential for comparative genomics approaches. The analysis of the transcriptome reveals strong differences in the enrichment of the Gene Ontology categories and the relative expression among different organs, which can guide future efforts for functional genomics or genetic improvement of A. donax. A set of homologs to key genes involved in lignin, cellulose, starch, lipid metabolism and in the domestication of other crops is discussed to provide a platform for possible enhancement of productivity and saccharification efficiency in A. donax.
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Affiliation(s)
- Gaurav Sablok
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund MachS. Michele all'Adige, TN, Italy
| | - Yuan Fu
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund MachS. Michele all'Adige, TN, Italy
- Dipartimento di Biotecnologie, Università degli Studi di VeronaVerona, Italy
| | - Valentina Bobbio
- Dipartimento di Scienze della Terra, dell'Ambiente e della Vita, Università degli Studi di GenovaGenova, Italy
- Unità di Ricerca per la Floricoltura e le Specie Ornamentali, Consiglio per la Ricerca e la Sperimentazione in AgricolturaSanremo, IM, Italy
| | - Marina Laura
- Unità di Ricerca per la Floricoltura e le Specie Ornamentali, Consiglio per la Ricerca e la Sperimentazione in AgricolturaSanremo, IM, Italy
| | - Giuseppe L Rotino
- Unità di Ricerca per l'Orticoltura, Consiglio per la Ricerca e la Sperimentazione in AgricolturaMontanaso Lombardo, LO, Italy
| | - Paolo Bagnaresi
- Consiglio per la Ricerca e la Sperimentazione in Agricoltura, Genomics Research CentreFiorenzuola D'Arda, PC, Italy
| | - Andrea Allavena
- Unità di Ricerca per la Floricoltura e le Specie Ornamentali, Consiglio per la Ricerca e la Sperimentazione in AgricolturaSanremo, IM, Italy
| | - Violeta Velikova
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund MachS. Michele all'Adige, TN, Italy
- Bulgarian Academy of Sciences, Institute of Plant Physiology and GeneticsSofia, Bulgaria
| | - Roberto Viola
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund MachS. Michele all'Adige, TN, Italy
| | - Francesco Loreto
- Dipartimento di Scienze Bio-Agroalimentari (DISBA), Consiglio Nazionale delle Ricerche (CNR)Roma, Italy
| | - Mingai Li
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund MachS. Michele all'Adige, TN, Italy
| | - Claudio Varotto
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund MachS. Michele all'Adige, TN, Italy
- * Correspondence (fax +39 0461 650 956; email )
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Velikova V, Ghirardo A, Vanzo E, Merl J, Hauck SM, Schnitzler JP. Genetic Manipulation of Isoprene Emissions in Poplar Plants Remodels the Chloroplast Proteome. J Proteome Res 2014; 13:2005-18. [DOI: 10.1021/pr401124z] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria
- Helmholtz
Zentrum München, Institute of Biochemical Plant Pathology, Research Unit, Environmental Simulation, Ingolstädter Landstr. 1, D-85764 Neuherberg, Germany
| | - Andrea Ghirardo
- Helmholtz
Zentrum München, Institute of Biochemical Plant Pathology, Research Unit, Environmental Simulation, Ingolstädter Landstr. 1, D-85764 Neuherberg, Germany
| | - Elisa Vanzo
- Helmholtz
Zentrum München, Institute of Biochemical Plant Pathology, Research Unit, Environmental Simulation, Ingolstädter Landstr. 1, D-85764 Neuherberg, Germany
| | - Juliane Merl
- Helmholtz
Zentrum München, Research Unit Protein Science, Ingolstädter
Landstr. 1, D-85764 Neuherberg, Germany
| | - Stefanie M. Hauck
- Helmholtz
Zentrum München, Research Unit Protein Science, Ingolstädter
Landstr. 1, D-85764 Neuherberg, Germany
| | - Jörg-Peter Schnitzler
- Helmholtz
Zentrum München, Institute of Biochemical Plant Pathology, Research Unit, Environmental Simulation, Ingolstädter Landstr. 1, D-85764 Neuherberg, Germany
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Brilli F, Tsonev T, Mahmood T, Velikova V, Loreto F, Centritto M. Ultradian variation of isoprene emission, photosynthesis, mesophyll conductance, and optimum temperature sensitivity for isoprene emission in water-stressed Eucalyptus citriodora saplings. J Exp Bot 2013; 64:519-28. [PMID: 23293347 DOI: 10.1093/jxb/ers353] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Water availability is a major limiting factor on plant growth and productivity. Considering that Eucalyptus spp. are among the few plant species able to produce both isoprene and monoterpenes, experiments were designed to investigate the response of isoprene emission and isoprenoid concentrations in Eucalyptus citriodora saplings exposed to decreasing fraction of transpirable soil water (FTSW). In particular, this study aimed to assess: (a) the kinetic of water stress-induced variations in photosynthesis, isoprene emission, and leaf isoprenoid concentrations during progressive soil water shortage as a function of FTSW; (b) the ultradian control of isoprene emission and photosynthesis under limited soil water availability; and (c) the optimum temperature sensitivity of isoprene emission and photosynthesis under severe water stress. The optimum temperature for isoprene emission did not change under progressive soil water deficit. However, water stress induced a reallocation of carbon through the MEP/DOXP pathway resulting in a qualitative change of the stored isoprenoids. The ultradian trend of isoprene emission was also unaffected under water stress, and a similar ultradian trend of stomatal and mesophyll conductances was also observed, highlighting a tight coordination between diffusion limitations to photosynthesis during water stress. The kinetics of photosynthetic parameters and isoprene emission in response to decreasing FTSW in E. citriodora are strikingly similar to those measured in other plant functional types. These findings may be useful to refine the algorithms employed in process-based models aiming to precisely up-scale carbon assimilation and isoprenoid emissions at regional and global scales.
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Affiliation(s)
- Federico Brilli
- Institute of Agro-Environmental and Forest Biology, National Research Council, Via Salaria km 29, 300-00015 Monterotondo Scalo, Roma, Italy
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Beckett M, Loreto F, Velikova V, Brunetti C, Di Ferdinando M, Tattini M, Calfapietra C, Farrant JM. Photosynthetic limitations and volatile and non-volatile isoprenoids in the poikilochlorophyllous resurrection plant Xerophyta humilis during dehydration and rehydration. Plant Cell Environ 2012; 35:2061-74. [PMID: 22582997 DOI: 10.1111/j.1365-3040.2012.02536.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We investigated the photosynthetic limitations occurring during dehydration and rehydration of Xerophyta humilis, a poikilochlorophyllous resurrection plant, and whether volatile and non-volatile isoprenoids might be involved in desiccation tolerance. Photosynthesis declined rapidly after dehydration below 85% relative water content (RWC). Raising intercellular CO(2) concentrations during desiccation suggest that the main photosynthetic limitation was photochemical, affecting energy-dependent RuBP regeneration. Imaging fluorescence confirmed that both the number of photosystem II (PSII) functional reaction centres and their efficiency were impaired under progressive dehydration, and revealed the occurrence of heterogeneous photosynthesis during desiccation, being the basal leaf area more resistant to the stress. Full recovery in photosynthetic parameters occurred on rehydration, confirming that photosynthetic limitations were fully reversible and that no permanent damage occurred. During desiccation, zeaxanthin and lutein increased only when photosynthesis had ceased, implying that these isoprenoids do not directly scavenge reactive oxygen species, but rather protect photosynthetic membranes from damage and consequent denaturation. X. humilis was found to emit isoprene, a volatile isoprenoid that acts as a membrane strengthener in plants. Isoprene emission was stimulated by drought and peaked at 80% RWC. We surmise that isoprene and non-volatile isoprenoids cooperate in reducing membrane damage in X. humilis, isoprene being effective when desiccation is moderate while non-volatile isoprenoids operate when water deficit is more extreme.
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Affiliation(s)
- Megan Beckett
- Department of Molecular and Cell Biology, University of Cape Town, Private Bag, Rondebosch 7701, South Africa
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Velikova V, La Mantia T, Lauteri M, Michelozzi M, Nogues I, Loreto F. The impact of winter flooding with saline water on foliar carbon uptake and the volatile fraction of leaves and fruits of lemon (Citrus × limon) trees. Funct Plant Biol 2012; 39:199-213. [PMID: 32480774 DOI: 10.1071/fp11231] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2011] [Accepted: 12/30/2011] [Indexed: 06/11/2023]
Abstract
We investigated the consequences of recurrent winter flooding with saline water on a lemon (Citrus×limon (L.) Burm.f.) orchard, focussing on photosynthesis limitations and emission of secondary metabolites (isoprenoids) from leaves and fruits. Measurements were carried out immediately after flooding (December), at the end of winter (April) and after a dry summer in which plants were irrigated with optimal quality water (September). Photosynthesis was negatively affected by flooding. The effect was still visible at the end of winter, whereas the photosynthetic rate was fully recovered after summer, indicating an unexpected resilience capacity of flooded plants. Photosynthesis inhibition by flooding was not due to diffusive limitations to CO2 entry into the leaf, as indicated by measurements of stomatal conductance and intercellular CO2 concentration. Biochemical and photochemical limitations seemed to play a more important role in limiting the photosynthesis of flooded plants. In young leaves, characterised by high rates of mitochondrial respiration, respiratory rates were enhanced by flooding. Flooding transiently caused large and rapid emission of several volatile isoprenoids. Emission of limonene, the most abundant compound, was stimulated in the leaves, and in young and mature fruits. Flooding changed the blend of emitted isoprenoids, but only few changes were observed in the stored isoprenoids pool.
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Affiliation(s)
- Violeta Velikova
- Consiglio Nazionale delle Ricerche - Istituto di Biologia Agroambientale e Forestale, Porano, Terni 05010, Italy
| | - Tommaso La Mantia
- Universita' di Palermo - Dipartimento di Colture Arboree, Facoltà di Agraria, Palermo 90128, Italy
| | - Marco Lauteri
- Consiglio Nazionale delle Ricerche - Istituto di Biologia Agroambientale e Forestale, Porano, Terni 05010, Italy
| | - Marco Michelozzi
- Consiglio Nazionale delle Ricerche - Istituto di Genetica Vegetale, Sesto Fiorentino, Firenze 50019, Italy
| | - Isabel Nogues
- Consiglio Nazionale delle Ricerche - Istituto di Biologia Agroambientale e Forestale, Porano, Terni 05010, Italy
| | - Francesco Loreto
- Consiglio Nazionale delle Ricerche - Istituto per la Protezione delle Piante, Sesto Fiorentino, Firenze 50019, Italy
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Velikova V, Sharkey TD, Loreto F. Stabilization of thylakoid membranes in isoprene-emitting plants reduces formation of reactive oxygen species. Plant Signal Behav 2012; 7:139-41. [PMID: 22301981 PMCID: PMC3357355 DOI: 10.4161/psb.7.1.18521] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [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: 05/18/2023]
Abstract
Isoprene is emitted by a significant fraction of the world's vegetation. Isoprene makes leaves more thermotolerant, yet we do not fully understand how. We have recently shown that isoprene stabilizes thylakoid membranes under heat stress. Here we show that heat-stressed, isoprene-emitting transgenic Arabidopsis plants also produce a lower pool of reactive oxygen and reactive nitrogen species, and that this was especially due to a lower accumulation of H2O2 in isoprene emitting plants. It remains difficult to disentangle whether in heat stressed plants isoprene also directly reacts with and quenches reactive oxygen species (ROS), or reduces ROS formation by stabilizing thylakoids. We present considerations that make the latter a more likely mechanism, under our experimental circumstances.
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Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology and Genetics; Bulgarian Academy of Sciences; Sofia, Bulgaria
| | - Thomas D. Sharkey
- Department of Biochemistry and Molecular Biology; Michigan State University; East Lansing, MI USA
| | - Francesco Loreto
- Institute for Plant Protection; National Research Council; Florence, Italy
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Velikova V, Várkonyi Z, Szabó M, Maslenkova L, Nogues I, Kovács L, Peeva V, Busheva M, Garab G, Sharkey TD, Loreto F. Increased thermostability of thylakoid membranes in isoprene-emitting leaves probed with three biophysical techniques. Plant Physiol 2011; 157:905-16. [PMID: 21807886 PMCID: PMC3192565 DOI: 10.1104/pp.111.182519] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Accepted: 07/28/2011] [Indexed: 05/19/2023]
Abstract
Three biophysical approaches were used to get insight into increased thermostability of thylakoid membranes in isoprene-emittingplants.Arabidopsis (Arabidopsis thaliana) plants genetically modified to make isoprene and Platanus orientalis leaves, in which isoprene emission was chemically inhibited, were used. First, in the circular dichroism spectrum the transition temperature of the main band at 694 nm was higher in the presence of isoprene, indicating that the heat stability of chiral macrodomains of chloroplast membranes, and specifically the stability of ordered arrays of light-harvesting complex II-photosystem II in the stacked region of the thylakoid grana, was improved in the presence of isoprene. Second, the decay of electrochromic absorbance changes resulting from the electric field component of the proton motive force (ΔA₅₁₅) was evaluated following single-turnover saturating flashes. The decay of ΔA₅₁₅ was faster in the absence of isoprene when leaves of Arabidopsis and Platanus were exposed to high temperature, indicating that isoprene protects the thylakoid membranes against leakiness at elevated temperature. Finally, thermoluminescence measurements revealed that S₂Q(B)⁻ charge recombination was shifted to higher temperature in Arabidopsis and Platanus plants in the presence of isoprene, indicating higher activation energy for S₂Q(B)⁻ redox pair, which enables isoprene-emitting plants to perform efficient primary photochemistry of photosystem II even at higher temperatures. The data provide biophysical evidence that isoprene improves the integrity and functionality of the thylakoid membranes at high temperature. These results contribute to our understanding of isoprene mechanism of action in plant protection against environmental stresses.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Francesco Loreto
- Institute of Plant Physiology and Genetics (V.V., L.M., V.P.) and Institute of Biophysics and Biomedical Engineering (M.B.), Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, 6726 Szeged, Hungary (Z.V., M.S., L.K., G.G.); Institute of Agroenvironmental and Forest Biology, National Research Council, 00015 Monterotondo, Rome, Italy (I.N.); Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824 (T.D.S.); Institute for Plant Protection, National Research Council, 50019 Sesto Fiorentino, Florence, Italy (F.L.)
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Velikova V, Tsonev T, Loreto F, Centritto M. Changes in photosynthesis, mesophyll conductance to CO2, and isoprenoid emissions in Populus nigra plants exposed to excess nickel. Environ Pollut 2011; 159:1058-66. [PMID: 21126813 DOI: 10.1016/j.envpol.2010.10.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Accepted: 10/18/2010] [Indexed: 05/08/2023]
Abstract
Poplar (Populus nigra) plants were grown hydroponically with 30 and 200 μM Ni (Ni30 and Ni200). Photosynthesis limitations and isoprenoid emissions were investigated in two leaf types (mature and developing). Ni stress significantly decreased photosynthesis, and this effect depended on the leaf Ni content, which was lower in mature than in developing leaves. The main limitations to photosynthesis were attributed to mesophyll conductance and metabolism impairment. In Ni-stressed developing leaves, isoprene emission was significantly stimulated. We attribute such stimulation to the lower chloroplastic [CO2] than in control leaves. However chloroplastic [CO2] did not control isoprene emission in mature leaves. Ni stress induced the emission of cis-β-ocimene in mature leaves, and of linalool in both leaf types. Induced biosynthesis and emission of isoprenoids reveal the onset of antioxidant processes that may also contribute to reduce Ni stress, especially in mature poplar leaves.
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Affiliation(s)
- Violeta Velikova
- Bulgarian Academy of Sciences, Acad. M. Popov Institute of Plant Physiology, Acad. G. Bonchev, Bl. 21, 1113 Sofia, Bulgaria.
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Velikova V, Salerno G, Frati F, Peri E, Conti E, Colazza S, Loreto F. Influence of Feeding and Oviposition by Phytophagous Pentatomids on Photosynthesis of Herbaceous Plants. J Chem Ecol 2010; 36:629-41. [DOI: 10.1007/s10886-010-9801-7] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2010] [Revised: 05/04/2010] [Accepted: 05/06/2010] [Indexed: 11/29/2022]
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Velikova V, Tsonev T, Barta C, Centritto M, Koleva D, Stefanova M, Busheva M, Loreto F. BVOC emissions, photosynthetic characteristics and changes in chloroplast ultrastructure of Platanus orientalis L. exposed to elevated CO2 and high temperature. Environ Pollut 2009; 157:2629-2637. [PMID: 19477569 DOI: 10.1016/j.envpol.2009.05.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Revised: 04/27/2009] [Accepted: 05/03/2009] [Indexed: 05/27/2023]
Abstract
To investigate the interactive effects of increasing [CO(2)] and heat wave occurrence on isoprene (IE) and methanol (ME) emissions, Platanus orientalis was grown for one month in ambient (380 micromol mol(-1)) or elevated (800 micromol mol(-1)) [CO(2)] and exposed to high temperature (HT) (38 degrees C/4 h). In pre-existing leaves, IE emissions were always higher but ME emissions lower as compared to newly-emerged leaves. They were both stimulated by HT. Elevated [CO(2)] significantly reduced IE in both leaf types, whereas it increased ME in newly-emerged leaves only. In newly-emerged leaves, elevated [CO(2)] decreased photosynthesis and altered the chloroplast ultrastructure and membrane integrity. These harmful effects were amplified by HT. HT did not cause any unfavorable effects in pre-existing leaves, which were characterized by inherently higher IE rates. We conclude that: (1) these results further prove the isoprene's putative thermo-protective role of membranes; (2) HT may likely outweigh the inhibitory effects of elevated [CO(2)] on IE in the future.
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Affiliation(s)
- Violeta Velikova
- Bulgarian Academy of Sciences, Institute of Plant Physiology, Acad. G. Bonchev, Bl. 21, 1113 Sofia, Bulgaria.
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Abstract
Isoprene and nitric oxide (NO) are two volatile molecules that are produced in leaves. Both compounds were suggested to have an important protective role against stresses. We tested, in two isoprene-emitting species, Populus nigra and Phragmites australis, whether: (1) NO emission outside leaves is measurable and is affected by oxidative stresses; and (2) isoprene and NO protect leaves against oxidative stresses, both singularly and in combination. The emission of NO was undetectable, and the compensation point was very low in control poplar leaves. Both emission and compensation point increased dramatically in stressed leaves. NO emission was inversely associated with stomatal conductance. More NO was emitted in leaves that were isoprene-inhibited, and more isoprene was emitted when NO was reduced by NO scavenger c-PTIO. Both isoprene and NO reduced oxidative damages. Isoprene-emitting leaves which were also fumigated with NO, or treated with NO donor, showed low damage to photosynthesis, a reduced accumulation of H(2)O(2) and a reduced membrane denaturation. We conclude that measurable amounts of NO are only produced and emitted by stressed leaves, that both isoprene and NO are effective antioxidant molecules and that an additional protection is achieved when both molecules are released.
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Affiliation(s)
- Violeta Velikova
- Bulgarian Academy of Sciences - Institute of Plant Physiology, Sofia, Bulgaria
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Velikova V, Loreto F, Brilli F, Stefanov D, Yordanov I. Characterization of juvenile and adult leaves of Eucalyptus globulus showing distinct heteroblastic development: photosynthesis and volatile isoprenoids. Plant Biol (Stuttg) 2008; 10:55-64. [PMID: 18211547 DOI: 10.1055/s-2007-964964] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Heteroblastic Eucalyptus (Eucalyptus globulus L.) leaves were characterized for their functional diversity examining photosynthesis and photosynthesis limitations, transpiration, and the emission of isoprene and monoterpenes. In vivo and combined analyses of gas-exchange, chlorophyll fluorescence, and light absorbance at 830 nm were made on the adaxial and abaxial sides of juvenile and adult leaves. When adult leaves were reversed to illuminate the abaxial side, photosynthesis and isoprene emission were significantly lower than when the adaxial side was illuminated. Monoterpene emission, however, was independent on the side illuminated and similarly partitioned between the two leaf sides. The abaxial side of adult leaves showed less diffusive resistance to CO(2) acquisition by chloroplasts, but also lower ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity, than the adaxial leaf side. In juvenile leaves, photosynthesis, isoprene, and monoterpene emissions were similar when the adaxial or abaxial side was directly illuminated. In the abaxial side of juvenile leaves, photosynthesis did not match the rates attained by the other leaf types when exposed to elevated CO(2), which suggests the occurrence of a limitation of photosynthesis by ribulose bisphosphate (RuBP) regeneration. Accordingly, a reduced efficiency of both photosystems and a high non-radiative dissipation of energy was observed in the abaxial side of juvenile leaves. During light induction, the adaxial side of juvenile leaves also showed a reduced efficiency of photosystem II and a large non-radiative energy dissipation. Our report reveals distinct functional properties in Eucalyptus leaves. Juvenile leaves invest more carbon in isoprene, but not in monoterpenes, and have a lower water use efficiency than adult leaves. Under steady-state conditions, in adult leaves the isobilateral anatomy does not correspond to an equal functionality of the two sides, while in juvenile leaves the dorsiventral anatomy does not result in functional differences in primary or secondary metabolism in the two sides. However, photochemical limitations may reduce the efficiency of carbon fixation in the light, especially in the abaxial side of juvenile leaves.
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Affiliation(s)
- V Velikova
- Institute of Plant Physiology, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 21, 1113 Sofia, Bulgaria.
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Fares S, Brilli F, Noguès I, Velikova V, Tsonev T, Dagli S, Loreto F. Isoprene emission and primary metabolism in Phragmites australis grown under different phosphorus levels. Plant Biol (Stuttg) 2008; 10:38-43. [PMID: 17729207 DOI: 10.1055/s-2007-965429] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Aquatic plants are generally used for wastewater purification and phytoremediation, but some of them also emit large amounts of isoprene, the most abundant biogenic volatile organic compound. Since isoprenoid biosynthesis requires high amounts of phosphorylated intermediates, the emission may also be controlled by inorganic phosphorus concentration (Pi) in leaves. We carried out experiments to determine the emission of isoprene from Phragmites australis plants used in reconstructed wetlands to phytoremediate elevated levels of phosphorus contributed by urban wastes. Four groups of plants were grown hydroponically in water containing different levels of KH(2)PO(4). High levels of phosphorus in the water resulted in high Pi in the leaves. High Pi stimulated photosynthesis at intercellular CO(2) concentrations lower and higher than ambient, implying higher ribulose 1,5-bisphosphate carboxylase (Rubisco) activity and higher ribulose 1,5-bisphosphate regeneration rates, respectively. However, isoprene emission was substantially lower at high Pi than at low Pi, and was not associated to photosynthesis rates at high Pi. This surprising result suggests that isoprene is limited by processes other than photosynthetic intermediate availability or by energetic (ATP) requirements under high Pi levels. Irrespective of the mechanism responsible for the observed reduction of isoprene emission, our results show that Phragmites plants may effectively remove phosphorus from water without concurrently increase isoprene emission, at least on a leaf area basis. Thus, Phragmites used in reconstructed wetlands for phytoremediation of urban wastes rich of phosphates will not contribute high loads of hydrocarbons which may influence air quality over urban and peri-urban areas.
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Affiliation(s)
- S Fares
- Istituto di Biologia Agroambientale e Forestale, Via Salaria km. 29,300, 00016 Monterotondo Scalo (Roma), Italy.
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Lambrev PH, Tsonev T, Velikova V, Georgieva K, Lambreva MD, Yordanov I, Kovács L, Garab G. Trapping of the quenched conformation associated with non-photochemical quenching of chlorophyll fluorescence at low temperature. Photosynth Res 2007; 94:321-32. [PMID: 17786581 DOI: 10.1007/s11120-007-9216-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2007] [Accepted: 06/19/2007] [Indexed: 05/08/2023]
Abstract
The kinetics of non-photochemical quenching (NPQ) of chlorophyll fluorescence was studied in pea leaves at different temperatures between 5 and 25 degrees C and during rapid jumps of the leaf temperature. At 5 degrees C, NPQ relaxed very slowly in the dark and was sustained for up to 30 min. This was independent of the temperature at which quenching was induced. Upon raising the temperature to 25 degrees C, the quenched state relaxed within 1 min, characteristic for qE, the energy-dependent component of NPQ. Measurements of the membrane permeability (delta A515) in dark-adapted and preilluminated leaves and NPQ in the presence of dithiothreitol strongly suggest that the effect of low temperature on NPQ was not because of limitation by the lumenal pH or the de-epoxidation state of the xanthophylls. These data are consistent with the notion that the transition from the quenched to the unquenched state and vice versa involves a structural reorganization in the photosynthetic apparatus. An eight-state reaction scheme for NPQ is proposed, extending the model of Horton and co-workers (FEBS Lett 579:4201-4206, 2005), and a hypothesis is put forward concerning the nature of conformational changes associated with qE.
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Affiliation(s)
- Petar H Lambrev
- Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 521, 6726, Szeged, Hungary
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Velikova V, Loreto F, Tsonev T, Brilli F, Edreva A. Isoprene prevents the negative consequences of high temperature stress in Platanus orientalis leaves. Funct Plant Biol 2006; 33:931-940. [PMID: 32689303 DOI: 10.1071/fp06058] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2006] [Accepted: 06/07/2006] [Indexed: 06/11/2023]
Abstract
The phenomenon of enhanced plant thermotolerance by isoprene was studied in leaves of the same age of 1- or 2-year-old Platanus orientalis plants. Our goals were to determine whether the isoprene emission depends on the age of the plant, and whether different emission rates can influence heat resistance in plants of different age. Two-year-old plants emit greater amounts of isoprene and possess better capacity to cope with heat stress than 1-year-old plants. After a high temperature treatment (38°C for 4 h), photosynthetic activity, hydrogen peroxide content, lipid peroxidation and antiradical activity were preserved in isoprene emitting leaves of 1- and 2-year-old plants. However, heat inhibited photosynthesis and PSII efficiency, caused accumulation of H2O2, and increased all indices of membrane damage and antioxidant capacity in leaves of plants of both ages in which isoprene was inhibited by fosmidomycin. In isoprene-inhibited leaves fumigated with exogenous isoprene during the heat treatment, the negative effects on photosynthetic capacity were reduced. These results further support the notion that isoprene plays an important role in protecting photosynthesis against damage at high temperature. It is suggested that isoprene is an important compound of the non-enzymatic defence of plants against thermal stress, possibly contributing to scavenging of reactive oxygen species (ROS) and membrane stabilising capacity, especially in developed plants.
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Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Francesco Loreto
- CNR-Istituto di Biologia Agroambientale e Forestale, Monterotondo Scalo, Rome, Italy
| | - Tsonko Tsonev
- Institute of Plant Physiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Federico Brilli
- CNR-Istituto di Biologia Agroambientale e Forestale, Monterotondo Scalo, Rome, Italy
| | - Aglika Edreva
- Institute of Genetics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Velikova V, Tsonev T, Pinelli P, Alessio GA, Loreto F. Localized ozone fumigation system for studying ozone effects on photosynthesis, respiration, electron transport rate and isoprene emission in field-grown Mediterranean oak species. Tree Physiol 2005; 25:1523-32. [PMID: 16137938 DOI: 10.1093/treephys/25.12.1523] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We used a localized ozone (O3) fumigation (LOF) system to study acute and short-term O(3) effects on physiological leaf traits. The LOF system enabled investigation of primary and secondary metabolic responses of similarly and differently aged leaves on the same plant to three different O3 concentrations ([O3]), unconfounded by other influences on O3 sensitivity, such as genetic, meteorological and soil factors. To simulate the diurnal cycle of O3 formation, current-year and 1-year-old Quercus ilex (L.) and Quercus pubescens (L.) leaves were fumigated with O3 at different positions (and hence, different leaf ages) on the same branch over three consecutive days. The LOF system supplied a high [O3] (300+/-50 ppb) on leaves appressed to the vents, and an intermediate, super-ambient [O3] (varying between 120 and 280 ppb) on leaves less than 30 cm from the vent. Leaves more than 60 cm from the O3 vent were exposed to an [O3] comparable with the ambient concentration, with a 100 ppb peak during the hottest hours of the day. Only leaves exposed to the high [O3] were affected by the 3-day treatment, confirming that Mediterranean oak are tolerant to ambient and super-ambient [O3], but may be damaged by acute exposure to high [O3]. Stomatal and mesophyll conductance and photosynthesis were all reduced immediately after fumigation with high [O3], but recovered to control values within 72 h. Both the intercellular and chloroplast CO2 concentrations ([CO2]) remained constant throughout the experiment. Thus, although treatment with a high [O3] may have induced stomatal closure and consequent down-regulation of photosynthesis, we found no evidence that photosynthesis was limited by low [CO2] at the site of fixation. One-year-old leaves of Q. ilex were much less sensitive to O3 than current-year leaves, suggesting that the low stomatal conductance observed in aging leaves limited O3 uptake. No similar effect of leaf age was found in Q. pubescens. Dark respiration decreased during the treatment period, but a similar decrease was observed in leaves exposed to low [O3], and therefore may not be an effect of O3 treatment. Light respiration, on the other hand, was mostly constant in ozone-treated leaves and increased only in leaves in which photosynthesis was temporarily inhibited by high [O3], preventing them from acting as strong sinks that recycle respiratory CO2 in the leaves. There was no evidence of photochemical damage in Q. ilex leaves, whereas Q. pubescens leaves exposed to a high [O3] showed limited photochemical damage, but recovered rapidly. Biochemical markers were affected by the high [O3], indicating accumulation of reactive oxygen species (ROS) and increased denaturation of lipid membranes, followed by activation of isoprene biosynthesis in Q. pubescens leaves. We speculate that the high isoprene emissions helped quench ROS and normalize membrane stability in leaves recovering from O3 stress.
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Affiliation(s)
- Violeta Velikova
- Bulgarian Academy of Sciences, Institute of Plant Physiology, Acad. G. Bonchev Str., Sofia, Bulgaria
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Velikova V, Pinelli P, Pasqualini S, Reale L, Ferranti F, Loreto F. Isoprene decreases the concentration of nitric oxide in leaves exposed to elevated ozone. New Phytol 2005; 166:419-25. [PMID: 15819906 DOI: 10.1111/j.1469-8137.2005.01409.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Isoprene reduces visible damage (necrosis) of leaves caused by exposure to ozone but the mechanism is not known. Here we show that in Phragmites leaves isoprene emission was stimulated after a 3-h exposure to high ozone levels. The photosynthetic apparatus of leaves in which isoprene emission was inhibited by fosmidomycin became more susceptible to damage by ozone than in isoprene-emitting leaves. Three days after ozone fumigation, the necrotic leaf area was significantly higher in isoprene-inhibited leaves than in isoprene-emitting leaves. Isoprene-inhibited leaves also accumulated high amounts of nitric oxide (NO), as detected by epifluorescence light microscopy. Our results confirm that oxidative stresses activate biosynthesis and emission of chloroplastic isoprenoid, bringing further evidence in support of an antioxidant role for these compounds. It is suggested that, in nature, the simultaneous quenching of NO and reactive oxygen species by isoprene may be a very effective mechanism to control dangerous compounds formed under abiotic stress conditions, while simultaneously attenuating the induction of the hypersensitive response leading to cellular damage and death.
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Affiliation(s)
- Violeta Velikova
- Institute of Plant Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria
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Velikova V, Cociasu A, Popa L, Boicenco L, Petrova D. Phytoplankton community and hydrochemical characteristics of the Western Black Sea. Water Sci Technol 2005; 51:9-18. [PMID: 16114612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Since the early 1990s the persistent reports about the irreversibly degrading Black Sea have started to disappear. A large set of data, reflecting the temporal and spatial variability of microalgae and hydrochemical parameters in Western Black Sea waters (WBS), collected in 2001-2002 (EU 5th FP project "daNubs"), allows us to compare the present-day ecosystem functioning to previous ones and to certainly conclude on positive signs of relaxation. The years 2001 and 2002 were without ample, negative biological and hydrochemical events in the WBS. Nutrient general trend was a decreasing one since the late 1980s, and inorganic phosphorus and nitrogen concentrations were frequently below the method detection limits during summer autumn periods of 2001-2002. The shelf waters were properly oxygenated. The phytoplankton community was producing biomass in a decreasing tendency, especially obviously since 1995. Simultaneously, there was an increase in Si:P and Si:N molar ratios and concurrent increase in the diversity of mass algal species (mainly diatoms) but only a few of them generated exceptional blooms. Reduction of the ratios between phytoplankton and zooplankton biomasses became evident. The observed ecological status in 2001-2002 confirms that the Black Sea is no longer a reference point for progressive water quality deterioration.
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Affiliation(s)
- V Velikova
- Institute of Fisheries and Aquaculture, Primorski blvd, 4, P.O. Box 72, Varna 9000, Bulgaria
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Loreto F, Velikova V. Isoprene produced by leaves protects the photosynthetic apparatus against ozone damage, quenches ozone products, and reduces lipid peroxidation of cellular membranes. Plant Physiol 2001; 127:1781-1787. [PMID: 11743121 DOI: 10.1104/pp.010497] [Citation(s) in RCA: 529] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Many plants invest carbon to form isoprene. The role of isoprene in plants is unclear, but many experiments showed that isoprene may have a role in protecting plants from thermal damage. A more general antioxidant action has been recently hypothesized on the basis of the protection offered by exogenous isoprene in nonemitting plants exposed to acute ozone doses. We inhibited the synthesis of endogenous isoprene by feeding fosmidomycin and observed that Phragmites australis leaves became more sensitive to ozone than those leaves forming isoprene. Photosynthesis, stomatal conductance, and fluorescence parameters were significantly affected by ozone only in leaves on which isoprene was not formed. The protective effect of isoprene was more evident when the leaves were exposed for a long time (8 h) to relatively low (100 nL L(-1)) ozone levels than when the exposure was short and acute (3 h at 300 nL L(-1)). Isoprene quenched the amount of H(2)O(2) formed in leaves and reduced lipid peroxidation of cellular membranes caused by ozone. These results indicate that isoprene may exert its protective action at the membrane level, although a similar effect could be obtained if isoprene reacted with ozone before forming active oxygen species. Irrespective of the mechanism, our results suggest that endogenous isoprene has an important antioxidant role in plants.
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Affiliation(s)
- F Loreto
- Consiglio Nazionale delle Richerche, Istituto di Biochimica ed Ecofisiologia Vegetali, Rome, Italy.
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Loreto F, Velikova V. Isoprene produced by leaves protects the photosynthetic apparatus against ozone damage, quenches ozone products, and reduces lipid peroxidation of cellular membranes. Plant Physiol 2001. [PMID: 11743121 DOI: 10.1104/pp.127.4.1781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Many plants invest carbon to form isoprene. The role of isoprene in plants is unclear, but many experiments showed that isoprene may have a role in protecting plants from thermal damage. A more general antioxidant action has been recently hypothesized on the basis of the protection offered by exogenous isoprene in nonemitting plants exposed to acute ozone doses. We inhibited the synthesis of endogenous isoprene by feeding fosmidomycin and observed that Phragmites australis leaves became more sensitive to ozone than those leaves forming isoprene. Photosynthesis, stomatal conductance, and fluorescence parameters were significantly affected by ozone only in leaves on which isoprene was not formed. The protective effect of isoprene was more evident when the leaves were exposed for a long time (8 h) to relatively low (100 nL L(-1)) ozone levels than when the exposure was short and acute (3 h at 300 nL L(-1)). Isoprene quenched the amount of H(2)O(2) formed in leaves and reduced lipid peroxidation of cellular membranes caused by ozone. These results indicate that isoprene may exert its protective action at the membrane level, although a similar effect could be obtained if isoprene reacted with ozone before forming active oxygen species. Irrespective of the mechanism, our results suggest that endogenous isoprene has an important antioxidant role in plants.
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Affiliation(s)
- F Loreto
- Consiglio Nazionale delle Richerche, Istituto di Biochimica ed Ecofisiologia Vegetali, Rome, Italy.
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Velikova V, Petrova R, Angelova O. N-(2-Pyridinium)urea Perrhenate. Acta Crystallogr C 1997. [DOI: 10.1107/s0108270197004794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Velikova V, Kossev K, Angelova O. 1:1 Molecular Complex of 2-Amino-5-nitropyridine and 3-Nitro-2-pyridone. Acta Crystallogr C 1997. [DOI: 10.1107/s0108270197005799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Velikova V, Angelova O, Petrova R, Kossev K. N-(2-Pyridinium)urea Perchlorate. Acta Crystallogr C 1997. [DOI: 10.1107/s0108270197003156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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