Violeta Velikova

Dr. Violeta Velikova holds a professor position at the Institute of Plant Physiology and Genetics – Bulgarian Academy of Sciences.

ORCID ID: orcid.org/0000-0002-3058-919X
ResearcherID: J-8849-2016
Research Gate: Violeta Velikova

She has published 95 scientific research papers, with total impact factor of 201.609, total citations of 3106 (WoS) up to January 2017, and H-index of 22.

Dr. Velikova has 25-year experience in studying photosynthesis and 16-year experience in investigating biogenic volatile organic compounds. Dr. Velikova studies the interaction between biosphere and atmosphere with emphasis on emissions of biogenic volatile organic compounds, and on primary and secondary metabolism of plants under environmental constrains. The primary focus of the studies is the physiological role of isoprenoids.

Dr. Velikova’s activities prove:
  • For the first time to demonstrate that endogenous isoprene has an important protective role in plants, namely isoprene quenches the amount of hydrogen peroxide formed in leaves expose to ozone and reduces lipid peroxidation of cellular membranes (Loreto and Velikova – Plant Physiology 127:1781-1787, 2001).
  • The protective role of endogenous isoprene against singlet oxygen was also demonstrated (Velikova et al. – Physiologia Plantarum 122:219-225, 2004), suggesting that the protection mechanisms may involve a direct reaction of isoprene with this harmful reactive oxygen species (ROS).
  • Expansion of the work on isoprene antioxidant ability it was demonstrated that isoprene can regulate nitric oxide (NO) and ROS accumulation and this is an effective mechanism to control dangerous compounds formed under oxidative stress conditions, thus attenuating the induction of hypersensitive response leading to programmed cell death (Velikova et al. – New Phytologist 166:419-426, 2005; Velikova et al. – Plant Cell and Environment 31:1882-1894, 2008). Moreover, it is demonstrated that the nitrosative pressure is lower when isoprene is present in the leaf cells. The main target sites of NO action in non-isoprene emitting poplar are proteins related to the light and dark reactions of photosynthesis, the tricarboxylic acid cycle, protein metabolism, and redox regulation. The antioxidative defense system is rearranged in non-isoprene emitting poplar genotype at the protein level and at the level of protein S-nitrosylation strongly supporting the hypothesis that isoprene can alter signaling pathways by modulating to what extent and how rapidly RO and NO signaling molecules are generated within a cell (Vanzo et al. – Plant Physiology 170: 1945-1961, 2016).
  • Evidences are provided that endogenous isoprene is not only able to protect leaves against heat but also helps leaves to recover when the heat stress is alleviated (Velikova and Loreto – Plant Cell Environment 28:318-327, 2005). This protective action was due to ROS-scavenging and membrane-stabilizing properties of isoprene, and it was suggested that endogenous isoprene can contribute to the non-enzymatic defence of the plant (Velikova et al. – Functional Plant Biology 33:931-940, 2006).
  • It was directly demonstrated by using different biophysical techniques that isoprene has crucial role in preserving the intactness of thylakoid membranes under heat stress, and more specifically the functionality of photosystem II, suggesting some modifications in lipid environment due to isoprene presence (Velikova et al. – Plant Physiology 157: 905-916, 2011).
  • It was shown that not only isoprene, but other, higher molecular weight isoprenoids, as cis-beta-ocimene and linalool, may play an important role in plant resistance mechanisms against heavy metal stress (Velikova et al. – Environmental Pollution 159:1058-1066, 2011).
  • The effect of a future climate scenario – elevated CO2 and temperature, on plant stress resistance as mediated by volatile secondary metabolites was also reveal (Velikova et al. – Environment Pollution 157:2629-2637, 2009).
  • It was demonstrated that genetically modified tobacco plants able to emit isoprene were better protected from oxidative stress than naturally non-isoprene emitting tobacco (Vickers et al. – Plant Cell and Environment 32:520-531, 2009).
  • New approach for quantitative and qualitative proteomics based on stable isotope-coded protein labeling (ICPL) in combination with polyacrylamide gel electrophoresis (PAGE) and liquid chromatography tandem mass spectrometry (LC-MS/MS) were used to elucidate the chloroplast proteome of isoprene-emitting and non-isoprene emitting poplars. It was demonstrated that the suppression of isoprene synthase by RNA interference, leading to the development of non-isoprene emitting poplar genotypes, decreased levels of chloroplast proteins involved in photosynthesis and increased levels of histones and ribosomal proteins. The removal of isoprene emission in poplar causes large changes in the proteome of chloroplasts affecting the structural organization of thylakoid membranes. The absence of isoprene synthase activity and consequently of isoprene emission implied a down-regulation of proteins related to light reactions of photosynthesis, redox regulation and oxidative stress defense (Velikova et al. – Journal of Proteome Research 13:2005-2018, 2014).
  • The removal of isoprene emission in poplar causes large changes not only in the chloroplast proteome but also the lipid content affecting the structural organization of thylakoid membranes. It is demonstrated that the total amount of monogalactosyldiacylglycerols, digalactosyldiacylglycerols and phospholipids is reduced in chloroplasts when isoprene emission is blocked. The chloroplasts of non-isoprene emitting poplar are more rounded and contain fewer grana stacks and longer stroma thylakoids, more plastoglobules, and larger associative zones between chloroplasts and mitochondria (Velikova et al. – Plant Physiology 168: 859-870, 2015).
Dr. Velikova’s scientific achievements made significant contribution to the field of plant physiology and biochemistry:
  • The mitochondrial respiration during photosynthesis was measured for the first time in illuminated C4 plant. The results show that a very low amount of respiratory CO2 is released by maize leaves even when they are subject to rapidly developing salt and water stresses. Experimental evidence is also provided that CO2 is released only when photosynthesis is low because of limiting light intensity or in leaves exposed to heat stress. The majority of the CO2 formed through mitochondrial respiration is refixed in the mesophyll when photosynthesis is high. Mitochondrial respiration may become inhibited only under severe water-stress conditions (Loreto et al. – Australian Journal of Plant Physiology 28:1103-1108, 2001).
  • The singlet oxygen quenching properties of phenylamide compounds was demonstrated for the first time. Evidence was obtained that their acidic parent compounds (p-coumaric, caffeic and ferulic), as well as free polyamines (putrescine, spermidine and spermine) can act as quenchers of singlet oxygen, with this ability being dependent on the number of amino groups. The covalent bonding of putrescine with hydroxycinnamic acids results in potentiation of the singlet oxygen quenching ability in the phenylamide conjugates. Thus, both PA and phenylamides implicate in the versatile non-enzymatic ROS-scavenging network of plants, and can play a role in the antioxidant defense, particularly at sites of intensive singlet oxygen generation, such as the photosynthetic centers (Velikova et al. – Zeitschrift für Naturforschung 62c:833-838, 2007). Exogenous polyamines (spermidine and spermine) prevent plants from developing of oxidative stress injuries caused by simulated acid rain. It was suggested that polyamines may “prime” the cell to meet and combat stress by stabilizing membranes and forming a potential of higher “buffering” and antioxidant capacity. The more pronounced protective effect of spermine in comparison with spermidine could be accounted for by its longer chain and greater number of positive charges which allows more important neutralizing and membrane stabilizing ability (Velikova et al. – Plant Science 151:59-66, 2000).
  • It was demonstrated that egg deposition per se may significantly affect the plant’s primary metabolism and reduce photosynthetic activity (Velikova et al. – Journal of Chemical Ecology 36:629-641, 2010).

The awards granted to Dr. Velikova’s proposed projects by various associations, as Alexander von Humboldt Foundation (in 2012, 18 months), EU-FP7 – Marie Curie Industry-Academia Partnership and Pathways (IAPP) (in 2011, 12 months), the North Atlantic Treaty Organization (NATO, in 2000, 2001, 2003, 2004), European Science Foundation (ESF, in 2005, 2006, 2008), ACCENT-BIAFLUX (in 2006, 2009) prove her scientific excellence.

PUBLICATIONS

2017

Baldacchini C, Castanheiro A, Maghakyan N, Sgrigna G, Verhelst J, Alonso R, Amorim J, Bellan P, Breuste J, Bühler O, Cântar I, Cariñanos P, Carriero G, Churkina G, Dinca L, Esposito R, Gawronski S, Kern M, Le Thiec D, Moretti M, Ningal T, Rantzoudi E, Sinjur I, Stojanova B, Aničić Urošević M, Velikova V, Zivojinovic I, Sahakyan L, Calfapietra C, Samson R – How does the amount and composition of PM deposit on Platanus acerifolia leaves change across different cities in Europe? Environmental Science & Technology 51 (3), 1147–1156, 2017

Doneva D, Ahrar M, Tsonev T, Loreto F, Varotto C, Velikova V – The role of isoprene in two Arundineae species exposed to progressive drought. Compt. rend. Acad. bulg. Sci. 70(2), 203-212, 2017

2016

Arena C, Tsonev T, Doneva D, De Micco V, Michelozzi M, Brunetti C, Centritto M, Fineschi S, Velikova V, Loreto F – The effect of light quality on growth, photosynthesis, leaf anatomy and secondary metabolites of a monoterpene-emitting herbaceous species (Solanum lycopersicum L.) and an isoprene-emitting tree (Platanus orientalis L.). Environmental and Experimental Botany 130, 122-132, 2016

Astier J, Loake G, Velikova V, Gaupels F – Editorial: Interplay between NO signalling, ROS and the antioxidant system in plants. Frontiers in Plant Science, section Plant Physiology 7:1731, 2016

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. Biotechnology for Biofuels 9, 54, http://doi.org/10.1186/s13068-016-0471-8, 2016

Tatar Ö, Konakchiev A, Tsonev T, Velikova V, Gesheva E, Bayram E, Vitkov A, Edreva A Plant-soil water status-induced changes in physiological and biochemical properties of yarrow. Journal of Essential Oil Bearing Plants 19 (7): 1776-1787, 2016

Vanzo E, Merl-Pham J, Velikova V, Ghirardo A, Lindermayr C, Hauck SM, Bernhardt J, Riedel K, Durner J, Schnitzler J-P – Modulation of protein S-nitrosylation by isoprene emission in poplar. Plant Physiology 170 (4), 1945-1961, 2016

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 & Environment 39, 2185-2197, 2016

2015

Ahrar M, Doneva D, Koleva D, Romano A, Rodeghiero M, Tsonev T, Biasioli F, Stefanova M, Peeva V, Wohlfahrt G, Loreto F, Varotto C, Velikova V – Isoprene emission in the monocot Arundineae tribe in relation to functional and structural organization of the photosynthetic apparatus. Environmental and Experimental Botany 119: 87-95, 2015

Dimitrova S, Dankov K, Paunov M, Pavlova B, Goltsev V, Velikova V, Tsonev T, Kalaji H, Strasser R – Dark drops of prompt chlorophyll fluorescence as a novel approach for evaluation of the photosynthetic machinery state. J BioSci Biotechnology SE/ONLINE 103-113, 2015

Paunov M, Dankov K, Dimitrova S, Velikova V, Tsonev T, Strasser R, Kalaji H, Goltsev V – Effect of water stress on photosynthetic light phase in leaves of two ecotypes of Platanus orientalis L. plants. J BioSci Biotechnology SE/ONLINE 15-23, 2015

Stoychev V, Simova-Stoilova L, Vassileva V, Jorrín Novo JV, Vaseva I, Velikova V, Tsonev T, Demirevska K – Changes in 2-DE protein profile of white and red clover leaves in response to waterlogging stress and recovery. In: Advances in Environmental Research v. 39, Ed. JA Daniels, nova Publishers, New York, ISSN: 2158-5717, ISBN: 978-1-63482-380-7 (eBook) Chapter 9: 131-162, 2015

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 x acerifolia plants during Mediterranean summers. New Phytologist 207, 613-626, 2015

Velikova V, Müller C, Ghirardo A, Rock TM, Aichler M, Walch A, Schmitt-Kopplin P, Schnitzler JP – Knocking down isoprene emission modifies the lipid matrix of thylakoid membranes and influences the chloroplast ultrastructure in poplar. Plant Physiology 168: 859-870, 2015

2014

Centritto M, Haworth M, Marino G, Pallozi 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 Science 226, 82-91, 2014

Loreto F, Pollastri S, Fineschi S, Velikova V – Volatile isoprenoids and their importance for protection against environmental constraints in the Mediterranean area. Environmental and Experimental Botany 103, 99-106, 2014 (Review)

Sablok G, Fu Y, Bobbio V, Laura M, Rotino G, Bagnaresi P, Allavena A, Velikova V, Viola R, Loreto F, Li M, Varotto C – Fuelling genetic and metabolic exploration of C3 bioenergy crops through the first reference transcriptome of Arundo donax L. Plant Biotechnology Journal 12(5), 554-567, 2014

Tattini M, Velikova V, Vickers C, Brunetti C, Di Ferdinando M, Trivellini A, Fineschi S, Agati G, Ferrini F, Loreto – Isoprene production in transgenic tobacco alters isoprenoids, non-structural carbohydrates and phenylpropanoids metabolism, and protects photosynthesis from drought stress. Plant, Cell and Environment 37 (8), 1950-1964, 2014

Velikova V, Ghirardo A, Vanzo E, Merl J, Hauck SM, Schnitzler J-P – The genetic manipulation of isoprene emissions in poplar plants remodels the chloroplast proteome. Journal of Proteome Research 13 (4), 2005-2018, 2014

2013

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. Journal of Experimental Botany 64(2): 519-528, 2013

Calfapietra C, Pallozzi E, Lusini I, Velikova V – Modification of BVOC emissions induced by changes in atmospheric CO2 and air pollution levels. In: “Biology, Controls and Models of Tree Volatile Organic Compound Emissions”, eds. Ü. Niinemets & R.K. Monson. Tree Physiology 5, Springer Science+Business Media Dordrecht, CHAPTER 10: pp. 253-284, 2013

Krumova S, Zhipinova M, Dankov K, Velikova V, Balashev K, Andreeva T, Russinova E, Taneva S – Brassinosteroids regulate the thylakoid membrane architecture and the photosystem II function. Journal of Photochemistry and Photobiology B, 126, 97-104, 2013

2012

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 and Environment 35 (12), 2061-2074, 2012

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 x limon L. (Burm. f.)) trees. Functional Plant Biology 39 (3), 199-213, 2012

Velikova V, Sharkey TD, Loreto F – Stabilization of thylakoid membranes in isoprene-emitting plants reduces formation of reactive oxygen species. Plant Signaling & Behavior 7(1), 139-141, 2012

2011

Krumova S, Zhiponova M, Dankov K, Rashkov G, Tsonev T, Russinova E, Velikova V, Busheva M – Effects of enhanced brassionsteroid perception on photosynthesis in Arabidopsis thaliana line BRIOE. Compt. rend. Acad. Sci. Bulg. 64 (7), 967-972, 2011

Tsonev T, Velikova V, Yildiz-Aktas L, Gűrel A, Edreva A – Effect of water deficit and potassium fertilization on photosynthetic activity in cotton plants. Plant Biosystems 145 (4), 841-847, 2011

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. Environmental Pollution 159, 1058-1066, 2011

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 Physiology 157, 905-916, 2011

2010

Koleva D, Stefanova M, Ganeva TS, Velikova V, Tsonev T, Loreto F – Structural responses of Platanus orientalis L. leaves to elevated CO2 concentration and high temperature. Journal of Environmental Protection and Ecology 11 (1), 122-129, 2010

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. Journal of Chemical Ecology 36: 629-641, 2010

2009

Velikova V, Tsonev T, Barta C, Centritto M, Koleva D, Stefanova M, Busheva M, Loreto F – BVOC emissions, photosynthetic characteristics and changes in chloroplast ultra-structure of Platanus orientalis L. exposed to elevated CO2 and high temperature. Environmental Pollution 157: 2629-2637, 2009

Vickers CE, Possell M, CI Cojocariu, Velikova VB, Laothawornkitkul J, Ryan A, Mullineaux PM, Hewitt CN – Isoprene synthesis protects transgenic plants from oxidative stress. Plant Cell and Environment 32: 520-531, 2009

2008

Edreva A, Velikova V, Tsonev T, Dagnon S, Gürel A, Aktaş, Gesheva E – Stress-protective role of secondary metabolites: diversity of functions and mechanisms. General and Applied Plant Physiology v. XXXIV (1-2): 67-78, 2008

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 Biology 10: 38-43, 2008

Velikova V – Isoprene as a tool for plant protection against abiotic stresses – review. Journal of Plant Interactions 3: 1-15, 2008

Velikova V, Fares S, Loreto F – Isoprene and nitric oxide reduce damages in leaves exposed to oxidative stress. Plant Cell and Environment 31: 1882-1894, 2008

Velikova V, Loreto F, Brilli1 F, Stefanov D, Yordanov I – Characterization of juvenile and adult leaves of Eucalyptus globulus showing distinct heteroblastic development: photosynthesis and volatile isoprenoids. Plant Biology 10: 55-64, 2008

2007

Edreva AM, Velikova VB, Tsonev TsD – Phenylamides in plants (review). Russ Journal of Plant Physiology, 54 (3), 325-341, 2007

Lambrev P, Tsonev T, Velikova V, Georgieva K, Lambreva M, Yordanov I, Kovács L, Gyözö G – Trapping of the quenched conformation associated with non-photochemical quenching of chlorophyll fluorescence at low temperature. Photosynthesis Research 94: 321-332, 2007

Velikova V, Edreva A, Tsonev T, Jones HG – Singlet oxygen quenching by phenylamides and their parent compounds. Zeitschrift fur Naturforschung 62c: 833-838, 2007

2006

Edreva A, Velikova V, Tsonev T, Gesheva E, Dagnon S, Loreto F, Gürel A, Hakerlerler A, Yagmur B, Akdemir H – Secondary metabolites: tools for stress protection in plants. Proceedings of IV BBC “Plant, fungal and habitat diversity investigation and conservation” – Sofia, 284-290, 2006

Velikova V – Endogenous isoprene and nitric oxide protect Phragmites australis plants against ozone stress. iLEAPS Newsletter (Integrated Land Ecosystem – Atmosphere Processes Study), No 3, 14-15, 2006

Velikova V, Loreto F, Tsonev T, Brilli F, Edreva A – Isoprene prevents the negative consequences of high temperature stress in Platanus orientalis leaves. Functional Plant Biology, 33: 931-940, 2006

2005

Stoyanova-Koleva D, Edreva A, Velikova V, Gürel A – Effect of reddening of cotton (Gossypium hirsutum L.) leaves on the ultrastructure of mesophyll cells. Photosynthetica 43(2): 313-316, 2005

Velikova V, Loreto F – On the relationship between isoprene emission and thermotolerance in Phragmites australis leaves exposed to high temperatures and during the recovery from a heat stress. Plant Cell and Environment 28, 318-327, 2005

Velikova V, Pinelli P, Loreto F – Consequences of inhibition of isoprene synthesis in Phragmites australis leaves exposed to elevated temperatures. Agriculture, Ecosystems & Environment 106 (2-3): 209-217, 2005

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 Phytologist 166: 419-426, 2005

Velikova V, Tsonev T, Pinelli P, Alessio GA, Loreto F – Localized O3-fumigation for field-studies of the impact of different ozone levels on photosynthesis, respiration, electron transport rate and isoprene emission in Mediterranean oak species. Tree Physiology, 25: 1523-1532, 2005

2004

Edreva A, Gürel A, Hakerlerler H, Yagmur B, Velikova V, Tsonev T, Stoyanova-Koleva D, Gesheva E, Dagnon S, Akdemir H. – A complex study on the reddening of cotton leaves. In: Proceedings of the Plenary Meeting of Inter-Regional Cooperative Research Network on Cotton. 29 September-2 October 2004. Thessaloniki, Greece 2004, 138-147

Velikova V, Edreva A, Loreto F – Endogenous isoprene protects Phragmites australis leaves against singlet oxygen. Physiologia Plantarum 122, 219-225, 2004

2003

Tsonev T, Velikova V, Georgieva K, Hyde PF, Jones HG – Low temperature enhances photosynthetic down-regulation in French bean (Phaseolus vulgaris L.) plants. Annals of Botany 91: 343-352, 2003

Yordanov I, V Velikova, T Tsonev – Plant responses to drought and stress tolerance (review). Bulgarian Journal of Plant Physiology., Special issue: 187-206, 2003

2002

Velikova V, Ivanova A, Yordanov I – Changes in lipid composition of Phaseolus vulgaris leaves after simulated acid rain treatment. Bulgarian Journal of Plant Physiology 28 (1-2): 59-65, 2002

Velikova V, Tsonev T, Edreva A, Gürel A, Hakerlerler H – Effects of reddening of cotton (Gossypium hirsutum L.) leaves on functional activity of photosynthetic apparatus. Photosynthetica 40 (3): 449-452, 2002

Yordanov I, Georgieva K, Velikova V, Tsonev T, Ivanov P, Tsenov N, Petrova T – Responses of photosynthetic apparatus of different wheat (Triticum aestivum l.) genotypes to drought under field conditions. II. Changes in O2 evolution and chlorophyll fluorescence parameters – a possible basis for screening of drought tolerance. Genetics and Breeding 31 (3-4): 21-30, 2001/2002

2001

Doncheva S, Stoyanova Z, Velikova V – The influence of succinate on zinc toxicity of pea plants. Journal of Plant Nutrition 24 (6): 789-806, 2001

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 Physiology 127: 1781-1787, 2001

Loreto F, Velikova V, Di Marco G – Respiration in the light measured by 12CO2 emission in 13CO2 atmosphere in maize leaves. Australian Journal of Plant Physiology 28 (11): 1103-1108, 2001

Loreto F, Velikova V, Stella D, Tricoli D, Di Marco G – Measurements of mitochondrial respiration in the light and estimation of its refixation in C3 and C4 leaves. PS2001 Proceedings 12th International Congress of Photosynthesis, August 18-23 August, Brisbane, Australia, S29-004, 2001

Velikova V, Cui X, Stella D, Loreto F – Ozone damage in leaves of forest tress is reduced by exogenous and endogenous isoprene. International Conference “Forest Research: A challenge for an integrated European approach”, August 27 – 1 September 2001, Thessaloniki, Greece: 265-268

Yordanov I, Georgieva K, Velikova V, Tsonev T, Merakchiiska-Nikolova M, Paunova S, Stefanov D – Response of photosynthetic apparatus of different wheat genotypes to drought. I. Laboratory experiments under controlled light and temperature conditions. Compt. rend. Acad. Sci. Bulg. 54 (12): 79-84, 2001

Yordanov I, Tsonev T, Velikova V, Georgieva K, Ivanov P, Tsenov N, Petrova T – Changes in CO2 assimilation, transpiration and stomatal resistance of different wheat cultivars experiencing drought under field conditions. Bulgarian Journal of Plant Physiology. 27 (3-4): 20-33, 2001

2000

Georgieva K, Tsonev T, Velikova V, Yordanov I – Photosynthetic activity during high temperature treatment of pea plants. Journal of Plant Physiology 157: 169-176, 2000

Tsonev T, Simidjiev I, Georgieva K, Velikova V, Yordanov I, Cseh Z, Garab G – Heat-induced changes in the chlorophyll fluorescence of pea chloroplasts. Compt. rend. Acad. Sci. Bulg. 53 (6): 99-102, 2000

Velikova V, Yordanov I, Edreva A – Oxidative stress and some antioxidant systems in acid rain-treated bean plants. Protective role of exogenous polyamines. Plant Science 151: 59-66, 2000

Yordanov I, Velikova V – Photoinhibition of photosystem I (review). Bulgarian Journal of Plant Physiology 26 (1-2): 70-92, 2000

Yordanov I, Velikova V, Tsonev T – Plant responses to drought, acclimation, and stress tolerance (review). Photosynthetica 38 (1): 171-186, 2000

1999

Tsonev T, Velikova V, Lambreva M, Stefanov D – Recovery of the photosynthetic apparatus in bean plants after high- and low-temperature induced photoinhibition. Bulgarian Journal of Plant Physiology 3-4: 45-53, 1999

Velikova V, Tsonev T, Yordanov I – Light- and CO2-responses of photosynthesis and chlorophyll fluorescence characteristics in bean plants after simulated acid rain. Physiologia Plantarum 107: 77-83, 1999

Yordanov I, Velikova V, Tsonev T – Influence of drought, high temperature, and carbamide cytokinin 4-PU-30 on photosynthetic activity of bean plants. 1. Changes in chlorophyll fluorescence quenching. Photosynthetica 37: 447-457, 1999

1998

Stoyanova D, Velikova V - Effects of simulated acid rain on chloroplast ultrastructure of primary leaves of Phaseolus vulgaris L. Biologia plantarum 40 (4): 589-595, 1998

Velikova V, Yordanov I – Effects of simulated acid rain on photosynthetic apparatus of bean plants in dependence from pH-values, mode of action and duration. Compt. rend. Acad. bulg. Sci. 51 (5 – 6), 63-66, 1998

Velikova V, Yordanov I, Georgieva K, Tsonev T, Goltsev V – Effects of exogenous polyamines applied separately and in combination with simulated acid rain on functional activity of photosynthetic apparatus. Journal of Plant Physiology 153 (3-4): 299-307, 1998

1997

Velikova V, Yordanov I, Kurteva M, Tsonev T – Effects of simulated acid rain on the photosynthetic characteristics of Phaseolus vulgaris L. Photosynthetica 34 (4): 523-535, 1997

Velikova V, Yordanov I, Stoyanova D, Uzunova A – Effect of simulated acid rain on the structure and activity of bean plants photosynthetic apparatus. 19th Panhellenic meeting of H. S. B. S. and Biological Meeting of Balcan Countries, 15-18 May 1997, Thessaloniki, Greece: 431-432, 1997

Yordanov I, Tsonev T, Georgieva K, Merakchiiska-Nikolova M, Velikova V, Kruleva L – Influence of carbamide cytokinin 4-PU30 on the photosynthesis of bean plants endured mild high temperature stress. Compt. rend. Acad. bulg. Sci. 50 (5): 99-102, 1997

Yordanov I, Tsonev T, Goltsev V, Kruleva L, Velikova V - Interactive effect of water deficit and high temperature on photosynthesis in sunflower and maize plants. 1. Changes in the parameters of chlorophyll fluorescence induction kinetics and fluorescence quenching. Photosynthetica 33(3-4): 391-402, 1997

1996

Velikova V, Yordanov I – Changes in prompt chlorophyll fluorescence and oxygen evolution after bean plant treatment by artificial acid rain. Bulgarian Journal of Plant Physiology 22 (3-4): 14-24, 1996

Velikova V, Yordanov I, Kurteva M – Photosynthetic characteristic of bean plants (Phaseolus vulgaris L.) with diffewrent pH of simulated acid rain. II. Changes in the rate of photosynthesis and transpiration. Compt. rend. Acad. bulg. Sci. 49 (11-12): 111-114, 1996

Yordanov I, Georgieva K, Tsonev T, Velikova V - Effect of cold hardening on some photosynthetic characteristics of pea plants. Bulgarian Journal of Plant Physiology 22 (1-2): 13-21, 1996

1995

Uzunova A, Velikova V - Influence of Cu2+ on the photosynthesis and the structure of photo-synthetic apparatus in pea (Pisum sativum, var. Ran). Compt. rend. Acad. bulg. Sci. 48 (5): 107-110, 1995

1993

Angelov M, Tsonev T, Dobrinova K, Velikova V, Stoyanova T – Changes in some photosynthetic parameters in pea plants after treatment with cobalt. Photosynthetica 28 (2): 289-295, 1993

1992

Todorov D, Alexieva V, Karanov E, Velichkov D, Velikova V - Effect of certain dicarboxylic acid monoesters on growth, chlorophyll content, chlorophyllase and peroxidase activities, and gas-exchange of young maize plants. Journal of Plant Growth Regulation 11: 233-238, 1992

Velikova V, Angelov M, Ivanova A – Die Photosyntheserate der Baumarten in anthropogenbelasteter Umgebung. Compt. rend. Acad. bulg. Sci. 45(8): 131-134, 1992

Velikova V, Angelov M, Ivanova A – Veraenderungen der Akkumulation von freien Prolin und Eiweiss in Blaettern von einigen Baumarten unter den anthropogenbelasteten Standorten. Compt. rend. Acad. bulg. Sci. 45(9): 123-124, 1992

1991

Uzunova A, Velikova V, Angelov M – Cu2+-effects upon pea plants. Vth International Youth Symposium “Plant metabolism regulation” Varna, Bulgaria, October 8-13, 1990, 106-109, 1991

Velikova V, Ivanova A – Peroxydase activity as an idicator of the stress reaction in some tree species due to air pollution. Vth International Youth Symposium “Plant Metabolism Regulation”, Varna, Bulgaria, October 8-13, 1990: 380-383, 1991

GRANTS

(PC = project coordinator)

International

2015 – present: Bilateral co-operation between BAS and Estonian University if Life Sciences, Tartu (Estonia) “Biogenic volatile organic compounds and their function in plant adaptation to changing environment” (PC)

2012 – present: “Team 2011” PAT – “Manipulation of volatile isoprenoids to improve plant performances against abiotic and biotic stresses” (MAN-VIP) (PC)

2011 – present: EU-Environment project “Effects of climate change on air pollution impacts and response strategies for European ecosystems” (ECLAIRE)

2010 – 2012: Bilateral co-operation between BAS and CNR (Italy) “Physiological role of biogenic isoprene against UV-B radiation stress” (PC)

2010 – 2012: Bilateral co-operation between BAS and HAS (Hungary) “Role of supramolecular organization of PSII – LHCII complex in isoprene emitting plants and its relation to thermoprotection”

2009 – 2011: Bilateral co-operation between BAS and TUBITAK (Turkey) “Comparative study of valuable medicinal plants of Achillea millefolium group: physiological and phytochemical approaches, and practical applications”

2007 – 2009: Bilateral co-operation between BAS and CNR (Italy) “Effect of phosphorus availability on the isoprene emission rate” (PC)

2006 – 2008: NATO LST.CLG 982412 “Plants from ultramafic sites as tools for remediation”

2006 – 2008: Bilateral co-operation between BAS and TUBITAK (Turkey) “Drought tolerance in cotton: a biochemical and physiological approach”

2004 – 2007: NATO EAP.RIG.981279 “Ecophysiological effects of isoprene emission” (PC)

2004 – 2006: Bilateral co-operation between BAS and CNR (Italy) “Present and future antioxidant action of plant isoprenoids” (PC)

2004 – 2006: Bilateral co-operation between BAS and HAS (Hungary) “Role of LHCII in the light harvesting and photoprotection”

2002 – 2004: Royal Society grant “Light stress tolerance in plants acclimated to different low-temperature regimes: Role of polyamines”

2002 – 2003: NATO LST.CLG 978838 “Physiological role of endogenous isoprene under different environmental stresses” (PC)

2000 – 2003: Bilateral co-operation between BAS and TUBITAK (Turkey) “Reddening of cotton leaves: causes and biochemical mechanisms”

2000 – 2003: Bilateral co-operation between BAS and HAS (Hungary) “Mechanisms of injury and acclimation of the photosynthetic apparatus and cell metabolism in pea plants under high temperature stress”

1999 – 2000: NATO – LST.CLG 974973 “Low temperature induced photoinhibition in bean plants: recovery and acclimation”

1996 – 1999: Bilateral co-operation between Bulgarian Academy of Sciences (BAS) and Hungarian Academy of Sciences (HAS) “Effect of thermal stress on the macroorganization of antenna system and the regulation of dissipative ways in the chloroplasts of higher plants”

National

2014 – 2016: National Science Fund, Bulgaria, B02-8/2012 “Biogenic volatile organic compounds, global climate change, and plant adaptation potential to changing environment”

2009 – 2012: National Science Fund, Bulgaria, DO 02-137/2009 “Desiccation induced damages and ecological sustainability of plants evaluated in terms of open system thermodynamics model derived from noninvasive biophysical tests”

2007 – 2010: National Science Fund, Bulgaria, ТКB-1604 “Role of isoprene for improving of plant thermotolerance in elevated CO2 environment”

2007 –2010: National Science Fund, Bulgaria, G-5-02 “Biochemical and physiological characteristics of mutant Arabidopsis thaliana plants altered in the H2O2-induced programmed cell death”

1998 – 2001: National Council for Scientific Investigations, Bulgaria, SS-814 “Comparative physiological and biochemical characterization of different genotypes of wheat (Triticum aestivum L.) for determination of their drought tolerance and choice of selection criteria”

1996 – 1999: National Council for Scientific Investigations, Bulgaria, K-603 “Photoinhibition at the background of high and low temperature – common characteristics and differences”

1996 – 1998: National Council for Scientific Investigations, Bulgaria, MU-BAV7 “Influence of simulated acid rain on the functional activity of the photosynthetic apparatus” (PC)

1995 – 1998: National Council for Scientific Investigations, Bulgaria, K-505 “Molecular mechanisms of acclimation of pea plants to low temperatures”

1994 – 1997: National Council for Scientific Investigations, Bulgaria, K-408 “Mechanisms of recovery of the photosynthetic apparatus after temperature and water stress by means of physiologically active substances”

1992 – 1995: National Council for Scientific Investigations, Bulgaria, K-210 “Studies of harmful heavy metal effects on photosynthetic apparatus of pea plants”

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