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Popova AV, Mihailova G, Geneva M, Peeva V, Kirova E, Sichanova M, Dobrikova A, Georgieva K. Different Responses to Water Deficit of Two Common Winter Wheat Varieties: Physiological and Biochemical Characteristics. Plants (Basel) 2023; 12:2239. [PMID: 37375865 DOI: 10.3390/plants12122239] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 05/31/2023] [Accepted: 06/05/2023] [Indexed: 06/29/2023]
Abstract
Since water scarcity is one of the main risks for the future of agriculture, studying the ability of different wheat genotypes to tolerate a water deficit is fundamental. This study examined the responses of two hybrid wheat varieties (Gizda and Fermer) with different drought resistance to moderate (3 days) and severe (7 days) drought stress, as well as their post-stress recovery to understand their underlying defense strategies and adaptive mechanisms in more detail. To this end, the dehydration-induced alterations in the electrolyte leakage, photosynthetic pigment content, membrane fluidity, energy interaction between pigment-protein complexes, primary photosynthetic reactions, photosynthetic and stress-induced proteins, and antioxidant responses were analyzed in order to unravel the different physiological and biochemical strategies of both wheat varieties. The results demonstrated that Gizda plants are more tolerant to severe dehydration compared to Fermer, as evidenced by the lower decrease in leaf water and pigment content, lower inhibition of photosystem II (PSII) photochemistry and dissipation of thermal energy, as well as lower dehydrins' content. Some of defense mechanisms by which Gizda variety can tolerate drought stress involve the maintenance of decreased chlorophyll content in leaves, increased fluidity of the thylakoid membranes causing structural alterations in the photosynthetic apparatus, as well as dehydration-induced accumulation of early light-induced proteins (ELIPs), an increased capacity for PSI cyclic electron transport and enhanced antioxidant enzyme activity (SOD and APX), thus alleviating oxidative damage. Furthermore, the leaf content of total phenols, flavonoids, and lipid-soluble antioxidant metabolites was higher in Gizda than in Fermer.
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Affiliation(s)
- Antoaneta V Popova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Gergana Mihailova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Maria Geneva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Violeta Peeva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Elisaveta Kirova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Mariyana Sichanova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Anelia Dobrikova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Katya Georgieva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
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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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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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Schlapakow E, Peeva V, Jeub M, Wabbels B, Zsurka G, Kunz W, Kornblum C. MITOCHONDRIAL DISEASES (Posters). Neuromuscul Disord 2018. [DOI: 10.1016/j.nmd.2018.06.219] [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: 10/28/2022]
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Szalai G, Janda K, Darkó É, Janda T, Peeva V, Pál M. Comparative analysis of polyamine metabolism in wheat and maize plants. Plant Physiol Biochem 2017; 112:239-250. [PMID: 28107732 DOI: 10.1016/j.plaphy.2017.01.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [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: 12/02/2016] [Revised: 01/03/2017] [Accepted: 01/11/2017] [Indexed: 06/06/2023]
Abstract
In the present work changes in polyamine contents were investigated after various hydroponic polyamine treatments (putrescine, spermidine and spermine at 0.1, 0.3 and 0.5 mM concentrations) in two different crop species, wheat and maize. In contrast to putrescine, higher polyamines (spermidine and spermine) induced concentration-dependent oxidative damage in both crops, resulting in decreased biomass. The unfavourable effects of polyamines were more pronounced in the roots, and maize was more sensitive than wheat. The adverse effects of polyamine treatment were proportional to the accumulation of polyamine and the plant hormone salicylic acid in the leaves and roots of both plant species. Changes in polyamine content and catabolism during osmotic stress conditions were also studied after beneficial pre-treatment with putrescine. The greater positive effect of putrescine in wheat than in maize can be explained by differences in the polyamine metabolism under normal and osmotic stress conditions, and by relationship between polyamines and salicylic acid. The results demonstrated that changes in the polyamine pool are important for fine tuning of polyamine signalling, which influences the hormonal balance required if putrescine is to exert a protective effect under stress conditions.
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Affiliation(s)
- Gabriella Szalai
- Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary
| | - Katalin Janda
- Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary
| | - Éva Darkó
- Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary
| | - Tibor Janda
- Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary
| | - Violeta Peeva
- Department of Photosynthesis, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bldg. 21, 1113 Sofia, Bulgaria
| | - Magda Pál
- Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary.
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Maslenkova L, Peeva V, Brankova L, Lazarova I, Evstatieva L. Screening by Thermoluminescence Method the Quantity of Biologically Active Compounds fromTribulus TerrestrisPlants with Different Origin. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2010.10817815] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Peeva V, Ivanova P, Harizanova N, Dimov S. A Preliminary Characterization of a Novel Bacteriocin-Like Substance fromEnterococcus DurumM-3. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2006.10817388] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Kornblum C, Nicholls T, Haack T, Schoeler S, Peeva V, Danhauser K, Hallmann K, Zsurka G, Rorbach J, Iuso A, Wieland T, Sciacco M, Ronchi D, Comi G, Moggio M, Quinzii C, DiMauro S, Calvo S, Mootha V, Klopstock T, Strom T, Meitinger T, Minczuk M, Kunz W, Prokisch H. O.24 Loss of function of MGME1, a novel player in mitochondrial DNA replication, causes a distinct autosomal recessive mitochondrial disorder. Neuromuscul Disord 2013. [DOI: 10.1016/j.nmd.2013.06.734] [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: 10/26/2022]
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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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Jovanovski E, Jenkins A, Dias AG, Peeva V, Sievenpiper J, Arnason JT, Rahelic D, Josse RG, Vuksan V. Effects of Korean red ginseng (Panax ginseng C.A. Mayer) and its isolated ginsenosides and polysaccharides on arterial stiffness in healthy individuals. Am J Hypertens 2010; 23:469-72. [PMID: 20134405 DOI: 10.1038/ajh.2010.5] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Preclinical studies indicate a role of Korean red ginseng (KRG) in the modulation of vascular function; however, clinical evidence is scarce. Therefore, the objective of this study was to investigate the effect of KRG root on peripheral blood pressure (BP) and augmentation index (AI), an emerging method to assess cardiovascular risk beyond conventional BP measurements. Furthermore, in an attempt to elucidate which of the major components of KRG is responsible for these effects, the ginsenoside and polysaccharide fractions isolated from the same KRG root were also investigated. METHODS The study was designed as an acute randomized, controlled, double blind, crossover trial. A total of 17 healthy fasted individuals (gender: 9 males:8 females, age: 30 +/- 9 years, body mass index: 25 +/- 3 kg/m(2), systolic BP (SBP): 110 +/- 10.1, diastolic BP (DBP): 65 +/- 7 mm Hg) received, on separate occasions, four treatments consisting of: 3 g of either placebo, KRG root, or a KRG root bioequivalent dose of ginsenoside or polysaccharide fractions. BP and AI were measured by applanation tonometry at baseline, 1, 2, and 3 h post-treatment. RESULTS Compared to placebo, 3 g of KRG significantly lowered radial AI by 4.6% (P = 0.045), whereas the ginsenoside fraction comparably decreased AI by 4.8% (P = 0.057), and no effect was observed with the polysaccharides. There were no differences in BP between treatments. CONCLUSION Although preliminary, this study is the first to demonstrate that KRG may improve arterial stiffness as measured by AI. In addition, it appears that ginsenosides may be the principal pharmacologically active component of the root, rather than the polysaccharide fraction. This study supports the results seen with KRG in the preclinical studies and warrants further investigation on acute and long-term endothelial parameters.
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Ducruet JM, Peeva V, Havaux M. Chlorophyll thermofluorescence and thermoluminescence as complementary tools for the study of temperature stress in plants. Photosynth Res 2007; 93:159-71. [PMID: 17279439 DOI: 10.1007/s11120-007-9132-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2006] [Accepted: 01/04/2007] [Indexed: 05/12/2023]
Abstract
The photosynthetic apparatus, especially the electron transport chain imbedded in the thylakoid membrane, is one of the main targets of cold and heat stress in plants. Prompt and delayed fluorescence emission originating from photosystem II have been used, most often separately, to monitor the changes induced in the photosynthetic membranes during progressive warming or cooling of a leaf sample. Thermofluorescence of F (0) and F (M) informs on the effects of heat on the chlorophyll antennae and the photochemical centers, thermoluminescence on the stabilization and movements of charges and Delayed Light Emission on the permeability of the thylakoid membranes to protons and ions. Considered together and operated simultaneously, these techniques constitute a powerful tool to characterize the effect of thermal stress on intact photosynthetic systems and to understand the mechanisms of constitutive or induced tolerance to temperature stresses.
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Affiliation(s)
- Jean-Marc Ducruet
- Service de Bioénergétique, INRA-CEA Saclay, 91191, Gif-sur-Yvette cedex, France.
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Georgieva K, Szigeti Z, Sarvari E, Gaspar L, Maslenkova L, Peeva V, Peli E, Tuba Z. Photosynthetic activity of homoiochlorophyllous desiccation tolerant plant Haberlea rhodopensis during dehydration and rehydration. Planta 2007; 225:955-64. [PMID: 16983535 DOI: 10.1007/s00425-006-0396-8] [Citation(s) in RCA: 49] [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] [Received: 06/12/2006] [Accepted: 08/22/2006] [Indexed: 05/11/2023]
Abstract
The functional state of the photosynthetic apparatus of flowering homoiochlorophyllous desiccation tolerant plant Haberlea rhodopensis during dehydration and subsequent rehydration was investigated in order to characterize some of the mechanisms by which resurrection plants survive drought stress. The changes in the CO2 assimilation rate, chlorophyll fluorescence parameters, thermoluminescence, fluorescence imaging and electrophoretic characteristics of the chloroplast proteins were measured in control, moderately dehydrated (50% water content), desiccated (5% water content) and rehydrated plants. During the first phase of desiccation the net CO2 assimilation decline was influenced by stomatal closure. Further lowering of net CO2 assimilation was caused by both the decrease in stomatal conductance and in the photochemical activity of photosystem II. Severe dehydration caused inhibition of quantum yield of PSII electron transport, disappearance of thermoluminescence B band and mainly charge recombination related to S2QA- takes place. The blue and green fluorescence emission in desiccated leaves strongly increased. It could be suggested that unchanged chlorophyll content and amounts of chlorophyll-proteins, reversible modifications in PSII electron transport and enhanced probability for non-radiative energy dissipation as well as increased polyphenolic synthesis during desiccation of Haberlea contribute to drought resistance and fast recovery after rehydration.
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Affiliation(s)
- Katya Georgieva
- Acad. M. Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, Sofia 1113, Bulgaria.
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Georgieva K, Maslenkova L, Peeva V, Markovska Y, Stefanov D, Tuba Z. Comparative study on the changes in photosynthetic activity of the homoiochlorophyllous desiccation-tolerant Haberlea rhodopensis and desiccation-sensitive spinach leaves during desiccation and rehydration. Photosynth Res 2005; 85:191-203. [PMID: 16075320 DOI: 10.1007/s11120-005-2440-0] [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: 11/18/2004] [Accepted: 02/14/2005] [Indexed: 05/03/2023]
Abstract
The functional peculiarities and responses of the photosynthetic system in the flowering homoiochlorophyllous desiccation-tolerant (HDT) Haberlea rhodopensis and the non-desiccation-tolerant spinach were compared during desiccation and rehydration. Increasing rate of water loss clearly modifies the kinetic parameters of fluorescence induction, thermoluminescence emission, far-red induced P700 oxidation and oxygen evolution in the leaves of both species. The values of these parameters returned nearly to the control level after 24 h rehydration only of the leaves of HDT plant. PS II was converted in a non-functional state in desiccated spinach in accordance with the changes in membrane permeability, malondialdehyde, proline and H(2)O(2) contents. Moreover, our data showed a strong reduction of the total number of PS II centers in Haberlea without any changes in the energetics of the charge recombination. We consider this observation, together with the previously reported unusually high temperature of B-band (S(2)Q(B)-) emission of Haberlea to reflect some specific adaptive characteristics of the photosynthetic system. As far as we know this is the first time when such adaptive characteristics and mechanism of the photosynthetic system of a flowering HDT higher plant is described. These features of Haberlea can explain the fast recovery of its photosynthesis after desiccation, which enable this HDT plant to rapidly take advantage of frequent changes in water availability.
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Affiliation(s)
- Katya Georgieva
- Acad. M. Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria.
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Peeva V, Maslenkova L. Thermoluminescence study of photosystem II activity in Haberlea rhodopensis and spinach leaves during desiccation. Plant Biol (Stuttg) 2004; 6:319-324. [PMID: 15143440 DOI: 10.1055/s-2004-820873] [Citation(s) in RCA: 10] [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: 05/24/2023]
Abstract
Thermoluminescence glow curve parameters were used to access the functional features of PS II in the Balkan endemic Haberlea rhodopensis. This representative of the higher desiccation-tolerant plants is unique for the European flora. An unusual high temperature of TL emission from Haberlea leaves after excitation by one flash at 5 degrees C was observed. The position of the main TL B band (S (2)Q (B)(-)) was at 45 - 47 degrees C, while this temperature was 30 - 32 degrees C in drought-sensitive mesophytic spinach. Consistent with the up-shift in TL emission, the lifetime of the S (2) state was also increased, showing a stabilization of charge storage in PS II complex in this resurrection plant. In addition, a part of PS II centres was less susceptible to DCMU. We consider the observed unusual TL characteristics of Haberlea rhodopensis reflect some structural modifications in PS II (especially in D1 protein), which could be related to the desiccation tolerance of this plant. This suggestion was supported by the different manner in which dehydration affected the TL properties in desiccation-tolerant Haberlea and desiccation-sensitive spinach plants.
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Affiliation(s)
- V Peeva
- Acad. M. Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria.
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Georgieva K, Fedina I, Maslenkova L, Peeva V. Response of chlorina barley mutants to heat stress under low and high light. Funct Plant Biol 2003; 30:515-524. [PMID: 32689036 DOI: 10.1071/fp03024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Barley plants (Hordeum vulgare L.) of wild type and two chlorina mutants, chlorina 126 and chlorina f2, were subjected to 42°C for 5 h at light intensities of 100 and 1000 μmol photons m-2 s-1. The exposure of plants to heat stress at a light intensity of 100 μmol m-2 s-1 induced enormous proline accumulation, indicating that the effect of heat stress was stronger when it was combined with low light intensity. The functional activity of PSII, O2evolution and flash-induced thermoluminescence B-band amplitude were strongly reduced when plants were exposed to heat at low light intensity. The results clearly showed that high light intensity had a protective effect on photosynthetic activity when barley plants were treated with high temperature. Comparison of the thermosensitivity of wild type plants and chlorina mutants revealed that O2 evolution in chlorina 126 and, especially, in chlorina f2 was more sensitive to heat than in wild type.
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Affiliation(s)
- Katya Georgieva
- Academic Metodi Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Academic Georgi Bonchev Street, Building 21, Sofia 1113, Bulgaria. Corresponding author;
| | - Ivanka Fedina
- Academic Metodi Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Academic Georgi Bonchev Street, Building 21, Sofia 1113, Bulgaria
| | - Liliana Maslenkova
- Academic Metodi Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Academic Georgi Bonchev Street, Building 21, Sofia 1113, Bulgaria
| | - Violeta Peeva
- Academic Metodi Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Academic Georgi Bonchev Street, Building 21, Sofia 1113, Bulgaria
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