23 results on '"Agnes Szepesi"'
Search Results
2. A case study on the early stage of Pinus nigra invasion and its impact on species composition and pattern in Pannonic sand grassland
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László Bakacsy and Ágnes Szepesi
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Medicine ,Science - Abstract
Abstract Alien woody species are successful invaders, frequently used for afforestation in regions like semi-arid lands. Shrubs and trees create important microhabitats in arid areas. Understorey vegetation in these habitats has unique species composition and coexistence. However, the impact of solitary woody species on understorey vegetation is less understood. This study evaluated the effect of native (Juniperus communis) and invasive solitary conifers (Pinus nigra) on surrounding vegetation, where individuals were relatively isolated (referred to as solitary conifers). The field study conducted in Pannonic dry sand grassland in 2018 recorded plant and lichen species presence around six selected solitary conifers. Composition and pattern of understorey vegetation were assessed using 26 m belt transects with 520 units of 5 cm × 5 cm contiguous microquadrats. Compositional diversity (CD) and the number of realized species combinations (NRC) were calculated from the circular transects. Results showed native conifer J. communis created more complex, organized microhabitats compared to alien P. nigra. CD and NRC values were significantly higher under native conifers than invasive ones (p = 0.045 and p = 0.026, respectively). Native species also had more species with a homogeneous pattern than the alien species. Alien conifers negatively affected understorey vegetation composition and pattern: some species exhibited significant gaps and clusters of occurrences along the transects under P. nigra. Based on our study, the removal of invasive woody species is necessary to sustain habitat diversity.
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- 2024
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3. Chondromesenchymal Hamartoma in Ectopic Thyroid Tissue in a Neonate
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Noémi Benedek, Anna Kover, Endre Kálmán, Béla Kajtár, Tamás Kövesi, Agnes Szepesi, Zsolt Juhasz, Peter Vajda, and Marianna Imre
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Pathology ,medicine.medical_specialty ,Ectopic thyroid tissue ,ectopic ,lcsh:Surgery ,Case Report ,Left sided ,thyroid ,03 medical and health sciences ,0302 clinical medicine ,030225 pediatrics ,Medicine ,Hamartoma ,chondromesenchymal ,medicine.diagnostic_test ,business.industry ,Thyroid ,lcsh:RJ1-570 ,lcsh:Pediatrics ,Magnetic resonance imaging ,Solid mass ,Histology ,lcsh:RD1-811 ,medicine.disease ,medicine.anatomical_structure ,hamartoma ,030211 gastroenterology & hepatology ,business - Abstract
A full-term male neonate presented with a left sided cervical lump at the level of the thyroid gland. Magnetic resonance imaging (MRI) showed a benign heterogeneous solid mass with lobulated margins. The tumor underwent complete excision. Histology revealed the diagnosis of chondromesenchymal hamartoma in ectopic thyroid tissue.
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- 2019
4. Editorial: Working towards sustainable agriculture with biostimulants and biocides: from chemical structure to application methods
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Ágnes Szepesi, Cristiano Soares, and Fernanda Fidalgo
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biocides ,biostimulants ,sustainable agriculture ,allelochemicals ,allelopathy ,abiotic stress ,Plant culture ,SB1-1110 - Published
- 2024
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5. Application of GC7 to reduce hypusination via inhibiting deoxyhypusine synthase in Arabidopsis thaliana seedlings exposed salt stress
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Ágnes Szepesi, Edina Kakas, Réka Szőllősi, Árpád Molnár, and Péter Pálfi
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Hypusination ,Deoxyhypusine synthase ,Salt stress ,GC7 ,Plant ecology ,QK900-989 - Abstract
Salt stress is one of the most harmful stress types affecting our agriculture and food safety. Despite the extensive knowledge of plant responses induced by salt stress, the details of the regulation of metabolite-dependent posttranslational modifications occurring during salt stress have rarely been investigated. Hypusination is polyamine-dependent posttranslational modification of eukaryotic translation factor 5A (eIF5A), which is conserved in all living organisms. Some evidence suggests that this modification plays an important role in salt stress tolerance, but the significance of the enzymes participating in the synthesis of hypusine is unknown. GC7 (N1-guanyl-1,7-diaminoheptane) is a special compound which can inhibit the enzyme activity of deoxyhypusine synthase (DHS). In our study, we applied GC7 in order to examine the applicability and efficiency of this compound and to decipher the modulation of polyamine metabolism during salt stress in plants. Our results support the significance of DHS during salt stress and of GC7 as an efficient tool to study hypusination in plant species.
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- 2023
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6. Investigation of the Allelopathic Effect of Two Invasive Plant Species in Rhizotron System
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László Bakacsy, Luca Viktória Kardos, Ágnes Szepesi, Krisztina Napsugár Nagy, Andrea Vasas, and Gábor Feigl
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allelopathy ,invasive species ,common milkweed ,false indigo-bush ,rhizotron ,Science - Abstract
A key question in plant invasion biology is why invasive plants are more competitive in their introduced habitat than in their native habitat. Studies show that invasive species exhibit allelopathy, influencing other plants by releasing chemicals. Research on allelopathy uses in vitro tests, investigating effects on seed germination and seedling development. Although soil plays a role in modifying allelopathic effects, observations with soil are rare and almost nothing is known about the root development of test plants developing in soil and the effects of allelopathic compounds on root architecture. Our study evaluates the allelopathic effects of false indigo-bush (Amorpha fruticosa L.) and common milkweed (Asclepias syriaca L.) on oilseed rape growth as a model plant. The rhizotron system was used to study the effect of morphology and root architecture. Leaf–soil mixtures at 0.5%, 1%, and 5% concentrations were used. Shoot and root development was strongly inhibited at 5%. But there was no difference between the allelopathy of the two species, and the application of lower concentrations did not show any effect, demonstrating that soil has a significant modifying effect on their allelopathy. Our results highlight that the development of roots growing in the soil is also worth investigating in connection with allelopathy, which can strengthen the ecological importance of allelochemicals during successful invasions.
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- 2024
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7. Concentration-dependent effects of effusol and juncusol from Juncus compressus on seedling development of Arabidopsis thaliana
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László Bakacsy, Lilla Sípos, Anita Barta, Dóra Stefkó, Andrea Vasas, and Ágnes Szepesi
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Medicine ,Science - Abstract
Abstract Juncus species are valuable sources of phenanthrene compounds that have been used in traditional Chinese medicine for thousands of years. Effusol and juncusol are the most investigated compounds reported to have antimicrobial and anticancer effects; however, to date, their effects on higher plants have not been investigated. In this study, we examined the effects of effusol and juncusol on the growth and other biochemical parameters of the dicot model plant Arabidopsis thaliana in a concentration-dependent manner with a focus on polyamine metabolism. Phenanthrene induced toxic effects on plant growth and development, while effusol and juncusol induced higher biomass and maintained antioxidant defence mechanisms associated with reduced polyamine degradation. Taken together, our results suggest that these compounds could be good candidates for new biopesticide or biostimulant plant growth regulators in the future.
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- 2022
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8. L-Aminoguanidine Induces Imbalance of ROS/RNS Homeostasis and Polyamine Catabolism of Tomato Roots after Short-Term Salt Exposure
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Ágnes Szepesi, László Bakacsy, Attila Fehér, Henrietta Kovács, Péter Pálfi, Péter Poór, Réka Szőllősi, Orsolya Kinga Gondor, Tibor Janda, Gabriella Szalai, Christian Lindermayr, László Szabados, and Laura Zsigmond
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salt stress ,polyamines ,copper amine oxidases ,nitric oxide ,hydrogen sulfide ,L-aminoguanidine ,Therapeutics. Pharmacology ,RM1-950 - Abstract
Polyamine (PA) catabolism mediated by amine oxidases is an important process involved in fine-tuning PA homeostasis and related mechanisms during salt stress. The significance of these amine oxidases in short-term responses to salt stress is, however, not well understood. In the present study, the effects of L-aminoguanidine (AG) on tomato roots treated with short-term salt stress induced by NaCl were studied. AG is usually used as a copper amine oxidase (CuAO or DAO) inhibitor. In our study, other alterations of PA catabolism, such as reduced polyamine oxidase (PAO), were also observed in AG-treated plants. Salt stress led to an increase in the reactive oxygen and nitrogen species in tomato root apices, evidenced by in situ fluorescent staining and an increase in free PA levels. Such alterations were alleviated by AG treatment, showing the possible antioxidant effect of AG in tomato roots exposed to salt stress. PA catabolic enzyme activities decreased, while the imbalance of hydrogen peroxide (H2O2), nitric oxide (NO), and hydrogen sulfide (H2S) concentrations displayed a dependence on stress intensity. These changes suggest that AG-mediated inhibition could dramatically rearrange PA catabolism and related reactive species backgrounds, especially the NO-related mechanisms. More studies are, however, needed to decipher the precise mode of action of AG in plants exposed to stress treatments.
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- 2023
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9. More Than a Diamine Oxidase Inhibitor: L-Aminoguanidine Modulates Polyamine-Related Abiotic Stress Responses of Plants
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Zoltán Márton Köhler and Ágnes Szepesi
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aminoguanidine ,plant ,nitric oxide synthase inhibitor ,polyamines ,copper amine oxidase ,Science - Abstract
L-aminoguanidine (AG) is an inhibitor frequently used for investigating plant abiotic stress responses; however, its exact mode of action is not well understood. Many studies used this compound as a specific diamine oxidase inhibitor, whereas other studies used it for reducing nitric oxide (NO) production. Recent studies suggest its antiglycation effect; however, this remains elusive in plants. This review summarises our current knowledge about different targets of AG in plants. Our recommendation is to use AG as a modulator of polyamine-related mechanisms rather than a specific inhibitor. In the future overall investigation is needed to decipher the exact mechanisms of AG. More careful application of AG could give more insight into plant abiotic stress responses.
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- 2023
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10. Short-Term Salicylic Acid Treatment Affects Polyamine Metabolism Causing ROS–NO Imbalance in Tomato Roots
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Ágnes Szepesi, Péter Poór, and László Bakacsy
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copper amine oxidase ,nitric oxide ,polyamines ,root ,salicylic acid ,tomato ,Botany ,QK1-989 - Abstract
The phytohormone salicylic acid (SA) can influence the polyamine metabolism in plants. Additionally, polyamines (PAs) can regulate the synthesis of SA, providing an exciting interplay between them not only in plant growth and development but also in biotic or abiotic stress conditions. The effect of SA on polyamine metabolism of leaves is well-studied but the root responses are rarely investigated. In this study, tomato roots were used to investigate the effect of short-term exposition of SA in two different concentrations, a sublethal 0.1 mM and a lethal 1 mM. To explore the involvement of SA in regulating PAs in roots, the degradation of PAs was also determined. As both SA and PAs can induce reactive oxygen species (ROS) and nitric oxide (NO) production, the balance of ROS and NO was analyzed in root tips. The results showed that 0.1 mM SA induced the production of higher PAs, spermidine (Spd), and spermine (Spm), while 1 mM SA decreased the PA contents by activating degrading enzymes. Studying the ROS and NO levels in root tips, the ROS production was induced earlier than NO, consistent with all the investigated zones of roots. This study provides evidence for concentration-dependent rapid effects of SA treatments on polyamine metabolism causing an imbalance of ROS–NO in root tips.
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- 2022
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11. Crosstalk between the Arabidopsis Glutathione Peroxidase-Like 5 Isoenzyme (AtGPXL5) and Ethylene
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Riyazuddin Riyazuddin, Krisztina Bela, Péter Poór, Ágnes Szepesi, Edit Horváth, Gábor Rigó, László Szabados, Attila Fehér, and Jolán Csiszár
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antioxidant mechanism ,Arabidopsis thaliana ,ethylene ,glutathione peroxidase-like 5 enzyme ,reactive oxygen species ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
Glutathione peroxidases (GPXs) are important antioxidant enzymes in animals. Plants contain GPX-like (GPXL) enzymes, which—in contrast to GPXs—contain cysteine in their active site instead of selenocysteine. Although several studies proved their importance in development and stress responses, their interaction with ethylene (ET) signalling is not known. Our aim was to investigate the involvement of AtGPXL5 in ET biosynthesis and/or signalling using Atgpxl5 mutant and AtGPXL5 cDNA-overexpressing (OX-AtGPXL5) lines. Four-day-old dark-grown Atgpxl5 seedlings had shorter hypocotyls and primary roots, while OX-AtGPXL5 seedlings exhibited a similar phenotype as wild type under normal conditions. Six-week-old OX-AtGPXL5 plants contained less H2O2 and malondialdehyde, but higher polyamine and similar ascorbate- and glutathione contents and redox potential (EGSH) than the Col-0. One-day treatment with the ET-precursor 1-aminocyclopropane-1-carboxylic acid (ACC) induced the activity of glutathione- and thioredoxin peroxidases and some other ROS-processing enzymes. In the Atgpxl5 mutants, the EGSH became more oxidised; parallelly, it produced more ethylene after the ACC treatment than other genotypes. Although the enhanced ET evolution measured in the Atgpxl5 mutant can be the result of the increased ROS level, the altered expression pattern of ET-related genes both in the Atgpxl5 and OX-AtGPXL5 plants suggests the interplay between AtGPXL5 and ethylene signalling.
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- 2022
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12. A comparative analysis of biogas production from tomato bio-waste in mesophilic batch and continuous anaerobic digestion systems.
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Árpád Szilágyi, Attila Bodor, Norbert Tolvai, Kornél L Kovács, László Bodai, Roland Wirth, Zoltán Bagi, Ágnes Szepesi, Viktória Markó, Balázs Kakuk, Naila Bounedjoum, and Gábor Rákhely
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Medicine ,Science - Abstract
Annually, agricultural activity produces an enormous amount of plant biomass by-product. Many studies have reported the biomethane potential of agro-industrial wastes, but only a few studies have investigated applying the substrates in both batch and continuous mode. Tomato is one of the most popular vegetables globally; its processing releases a substantial amount of by-product, such as stems and leaves. This study examined the BMP of tomato plant (Solanum lycopersicum Mill. L. cv. Alfred) waste. A comparative test revealed that the BMPs of corn stover, tomato waste,and their combination were approximately the same, around 280 mL methane/g Volatile Solid. In contrast, the relative biogas production decreased in the presence of tomato waste in a continuous mesophilic anaerobic digestion system; the daily biogas productions were 860 ± 80, 290 ± 50, and 570 ± 70 mL biogas/gVolatile Solid/day in the case of corn stover, tomato waste, and their mixture, respectively. The methane content of biogas was around 46-48%. The fermentation parameters of the continuous AD experiments were optimal in all cases; thus, TW might have an inhibitory effect on the microbial community. Tomato plant materials contain e.g. flavonoids, glycoalkaloids (such as tomatine and tomatidine), etc. known as antimicrobial and antifungal agents. The negative effect of tomatine on the biogas yield was confirmed in batch fermentation experiments. Metagenomic analysis revealed that the tomato plant waste caused significant rearrangements in the microbial communities in the continuously operated reactors. The results demonstrated that tomato waste could be a good mono-substrate in batch fermentations or a co-substrate with corn stover in a proper ratio in continuous anaerobic fermentations for biogas production. These results also point to the importance of running long-term continuous fermentations to test the suitability of a novel biomass substrate for industrial biogas production.
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- 2021
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13. Inhibiting Copper Amine Oxidase Using L-Aminoguanidine Induces Cultivar and Age-Dependent Alterations of Polyamine Catabolism in Tomato Seedlings
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Ágnes Szepesi, László Bakacsy, Henrietta Kovács, Árpád Szilágyi, and Zoltán Márton Köhler
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polyamines ,tomato ,development ,copper amine oxidases ,genotypes ,Agriculture (General) ,S1-972 - Abstract
Many effects of polyamines (PAs) are well known in plant developmental processes; however, the significance of their catabolism is not well understood. Copper amine oxidase (CuAO) is involved in the degradation of diamine putrescine (Put). The genotype dependence and time-dependent effects of this enzyme are rarely examined, so this study aims to discover the role of CuAO in tomato genotypes in different stages of seedling development. Exogenously applied L-aminoguanidine (AG), a CuAO inhibitor, was used to decrease the activity of CuAOs. Based on our results, it can be concluded that there is a genotype dependence of Put degradation, and AG treatment caused a long-term shift of PA catabolism by changing the activities of polyamine oxidase (PAO), catalyzing the degradation of higher PAs. Our results demonstrate that the modification of PA catabolism could have long-term results in polyamine metabolism in different tomato genotypes.
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- 2022
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14. Corrigendum: Structural Diversity and Bioactivities of Peptaibol Compounds From the Longibrachiatum Clade of the Filamentous Fungal Genus Trichoderma
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Tamás Marik, Chetna Tyagi, Dóra Balázs, Péter Urbán, Ágnes Szepesi, László Bakacsy, Gábor Endre, Dávid Rakk, András Szekeres, Maria A. Andersson, Heidi Salonen, Irina S. Druzhinina, Csaba Vágvölgyi, and László Kredics
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Trichoderma ,Longibrachiatum ,peptaibol ,brevicelsin ,mass spectrometry ,antifungal activity ,Microbiology ,QR1-502 - Published
- 2020
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15. Halotropism: Phytohormonal Aspects and Potential Applications
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Ágnes Szepesi
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halotropism ,salinity ,sodium ,root system architecture ,phytohormones ,Plant culture ,SB1-1110 - Abstract
Halotropism is a sodium specific tropic movement of roots in order to obtain the optimal salt concentration for proper growth and development. Numerous results suggest that halotropic events are under the control and regulation of complex plant hormone pathway. This minireview collects some recent evidences about sodium sensing during halotropism and the hormonal regulation of halotropic responses in glycophytes. The precise hormonal mechanisms by which halophytes plant roots perceive salt stress and translate this perception into adaptive, directional growth forward increased salt concentrations are not well understood. This minireview aims to gather recently deciphered information about halotropism focusing potential hormonal aspects both in glycophytes and halophytes. Advances in our understanding of halotropic responses in different plant species could help these plants to be used for sustainable agriculture and other future applications.
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- 2020
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16. Plant Metabolites and Regulation under Environmental Stress
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Ágnes Szepesi
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n/a ,Botany ,QK1-989 - Abstract
This Special Issue (SI) was planned to focus on abiotic stress-induced metabolic adjustments and their regulations in plants [...]
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- 2021
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17. Hypusination, a Metabolic Posttranslational Modification of eIF5A in Plants during Development and Environmental Stress Responses
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Péter Pálfi, László Bakacsy, Henrietta Kovács, and Ágnes Szepesi
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hypusination ,polyamines ,eIF5A ,deoxyhypusine synthase ,deoxyhypusine hydroxylase ,metabolic PTM ,Botany ,QK1-989 - Abstract
Hypusination is a unique posttranslational modification of eIF5A, a eukaryotic translation factor. Hypusine is a rare amino acid synthesized in this process and is mediated by two enzymes, deoxyhypusine synthase (DHS) and deoxyhypusine hydroxylase (DOHH). Despite the essential participation of this conserved eIF5A protein in plant development and stress responses, our knowledge of its proper function is limited. In this review, we demonstrate the main findings regarding how eIF5A and hypusination could contribute to plant-specific responses in growth and stress-related processes. Our aim is to briefly discuss the plant-specific details of hypusination and decipher those signal pathways which can be effectively modified by this process. The diverse functions of eIF5A isoforms are also discussed in this review.
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- 2021
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18. Structural Diversity and Bioactivities of Peptaibol Compounds From the Longibrachiatum Clade of the Filamentous Fungal Genus Trichoderma
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Tamás Marik, Chetna Tyagi, Dóra Balázs, Péter Urbán, Ágnes Szepesi, László Bakacsy, Gábor Endre, Dávid Rakk, András Szekeres, Maria A. Andersson, Heidi Salonen, Irina S. Druzhinina, Csaba Vágvölgyi, and László Kredics
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Trichoderma ,Longibrachiatum ,peptaibol ,brevicelsin ,mass spectrometry ,antifungal activity ,Microbiology ,QR1-502 - Abstract
This study examined the structural diversity and bioactivity of peptaibol compounds produced by species from the phylogenetically separated Longibrachiatum Clade of the filamentous fungal genus Trichoderma, which contains several biotechnologically, agriculturally and clinically important species. HPLC-ESI-MS investigations of crude extracts from 17 species of the Longibrachiatum Clade (T. aethiopicum, T. andinense, T. capillare, T. citrinoviride, T. effusum, T. flagellatum, T. ghanense, T. konilangbra, T. longibrachiatum, T. novae-zelandiae, T. pinnatum, T. parareesei, T. pseudokoningii, T. reesei, T. saturnisporum, T. sinensis, and T. orientale) revealed several new and recurrent 20-residue peptaibols related to trichobrachins, paracelsins, suzukacillins, saturnisporins, trichoaureocins, trichocellins, longibrachins, hyporientalins, trichokonins, trilongins, metanicins, trichosporins, gliodeliquescins, alamethicins and hypophellins, as well as eight 19-residue sequences from a new subfamily of peptaibols named brevicelsins. Non-ribosomal peptide synthetase genes were mined from the available genome sequences of the Longibrachiatum Clade. Their annotation and product prediction were performed in silico and revealed full agreement in 11 out of 20 positions regarding the amino acids predicted based on the signature sequences and the detected amino acids incorporated. Molecular dynamics simulations were performed for structural characterization of four selected peptaibol sequences: paracelsins B, H and their 19-residue counterparts brevicelsins I and IV. Loss of position R6 in brevicelsins resulted in smaller helical structures with higher atomic fluctuation for every residue than the structures formed by paracelsins. We observed the formation of highly bent, almost hairpin-like, helical structures throughout the trajectory, along with linear conformation. Bioactivity tests were performed on the purified peptaibol extract of T. reesei on clinically and phytopathologically important filamentous fungi, mammalian cells, and Arabidopsis thaliana seedlings. Porcine kidney cells and boar spermatozoa proved to be sensitive to the purified peptaibol extract. Peptaibol concentrations ≥0.3 mg ml−1 deterred the growth of A. thaliana. However, negative effects to plants were not detected at concentrations below 0.1 mg ml−1, which could still inhibit plant pathogenic filamentous fungi, suggesting that those peptaibols reported here may have applications for plant protection.
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- 2019
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19. Polyamine Metabolism Is Involved in the Direct Regeneration of Shoots from Arabidopsis Lateral Root Primordia
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Nikolett Kaszler, Péter Benkő, Dóra Bernula, Ágnes Szepesi, Attila Fehér, and Katalin Gémes
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Arabidopsis thaliana ,hydrogen peroxide ,polyamines ,polyamine oxidase ,reactive oxygen species ,direct shoot regeneration ,Botany ,QK1-989 - Abstract
Plants can be regenerated from various explants/tissues via de novo shoot meristem formation. Most of these regeneration pathways are indirect and involve callus formation. Besides plant hormones, the role of polyamines (PAs) has been implicated in these processes. Interestingly, the lateral root primordia (LRPs) of Arabidopsis can be directly converted to shoot meristems by exogenous cytokinin application. In this system, no callus formation takes place. We report that the level of PAs, especially that of spermidine (Spd), increased during meristem conversion and the application of exogenous Spd improved its efficiency. The high endogenous Spd level could be due to enhanced synthesis as indicated by the augmented relative expression of PA synthesis genes (AtADC1,2, AtSAMDC2,4, AtSPDS1,2) during the process. However, the effect of PAs on shoot meristem formation might also be dependent on their catabolism. The expression of Arabidopsis POLYAMINE OXIDASE 5 (AtPAO5) was shown to be specifically high during the process and its ectopic overexpression increased the LRP-to-shoot conversion efficiency. This was correlated with Spd accumulation in the roots and ROS accumulation in the converting LRPs. The potential ways how PAO5 may influence direct shoot organogenesis from Arabidopsis LRPs are discussed.
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- 2021
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20. Characterization of the Plant Growth-Promoting Activities of Endophytic Fungi Isolated from Sophora flavescens
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Adiyadolgor Turbat, Dávid Rakk, Aruna Vigneshwari, Sándor Kocsubé, Huynh Thu, Ágnes Szepesi, László Bakacsy, Biljana D. Škrbić, Enkh-Amgalan Jigjiddorj, Csaba Vágvölgyi, and András Szekeres
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endophytic fungi ,plant growth-promoting activities ,IAA (indole-acetic-acid) production ,Biology (General) ,QH301-705.5 - Abstract
Endophytic fungi in symbiotic association with their host plant are well known to improve plant growth and reduce the adverse effects of both biotic and abiotic stresses. Therefore, fungal endophytes are beginning to receive increased attention in an effort to find growth-promoting strains that could be applied to enhance crop yield and quality. In our study, the plant growth-promoting activities of endophytic fungi isolated from various parts of Sophora flavescens (a medicinally important plant in Mongolia and China) have been revealed and investigated. Fungal isolates were identified using molecular taxonomical methods, while their plant growth-promoting abilities were evaluated in plate assays. Altogether, 15 strains were isolated, representing the genera Alternaria, Didymella, Fusarium and Xylogone. Five of the isolates possessed phosphate solubilization activities and twelve secreted siderophores, while all of them were able to produce indoleacetic acid (IAA) in the presence or absence of tryptophan. The endogenous and exogenous accumulation of IAA were also monitored in liquid cultures using the HPLC-MS/MS technique to refine the plate assay results. Furthermore, for the highest IAA producer fungi, the effects of their extracts were also examined in plant bioassays. In these tests, the primary root lengths of the model Arabidopsis thaliana were increased in several cases, while the biomasses were significantly lower than the control IAA treatment. Significant alterations have also been detected in the photosynthetic pigment (chlorophyll-a, -b and carotenoids) content due to the fungal extract treatments, but these changes did not show any specific trends.
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- 2020
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21. Changes in aldehyde oxidase activity and gene expression in Solanum lycopersicum L. shoots under salicylic acid pre-treatment and subsequent salt stress
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Horváth, E., Gallé, Á, Agnes Szepesi, Tari, I., and Csiszár, J.
22. Influence of exogenous salicylic acid on antioxidant enzyme activities in the roots of salt stressed tomato plants
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Agnes Szepesi, Poór, P., Gémes, K., Horváth, E., and Tari, I.
23. Acclimation of tomato plants to salinity stress after a salicylic acid pre-treatment
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Tari, I., Csiszár, J., Szalai, G., Horváth, F., Pécsváradi, A., Kiss, G., Agnes Szepesi, Szabó, M., and Erdei, L.
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