Search results for: Éva Sárvári

Items from 1 to 17 out of 17 results

article

Etioplasts are more susceptible to salinity stress than chloroplasts and photosynthetically active etio‐chloroplasts of wheat (Triticum aestivum L.)

Roumaissa Ounoki, Adél Sóti, Renáta Ünnep, Gábor Sipka, more

Physiologia Plantarum > 175 > 6 > n/a - n/a

High soil salinity is a global problem in agriculture that directly affects seed germination and the development of the seedlings sown deep in the soil. To study how salinity affected plastid ultrastructure, leaf segments of 11‐day‐old light‐ and dark‐grown (etiolated) wheat (Triticum aestivum L. cv. Mv Béres) seedlings were floated on Hoagland solution, 600 mM KCl:NaCl (1:1) salt or isosmotic polyethylene...

article

Light sensitivity of Haberlea rhodopensis shade adapted phenotype under drought stress

Katya Georgieva, Ádam Solti, Ilona Mészáros, Áron Keresztes, more

Acta Physiologiae Plantarum > 2017 > 39 > 8 > 1-10

Haberlea rhodopensis belongs to the group of homoiochlorophyllous desiccation-tolerant plants which preserve their chlorophyll content during dehydration. It is a typical shade adapted plant and it is proved to be very sensitive to light intensity higher than the natural during drought stress. To reveal the reasons of their light sensitivity, we compared the damages and protective mechanisms of shade...

article

Incorporation of iron into chloroplasts triggers the restoration of cadmium induced inhibition of photosynthesis

Ádám Solti, Éva Sárvári, Brigitta Tóth, Ilona Mészáros, more

Journal of Plant Physiology > 2016 > 202 > C > 97-106

Photosynthetic symptoms of acute Cd stress can be remedied by elevated Fe supply. To shed more light on the most important aspects of this recovery, the detailed Fe trafficking and accumulation processes as well as the changes in the status of the photosynthetic apparatus were investigated in recovering poplar plants. The Cd-free, Fe-enriched nutrient solution induced an immediate intensive Fe uptake...

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Light piping driven photosynthesis in the soil: Low-light adapted active photosynthetic apparatus in the under-soil hypocotyl segments of bean (Phaseolus vulgaris)

Andrea Kakuszi, Éva Sárvári, Ádám Solti, Gyula Czégény, more

Journal of Photochemistry and Photobiology B: Biology > 2016 > 161 > C > 422-429

Photosynthetic activity was identified in the under-soil hypocotyl part of 14-day-old soil-grown bean plants (Phaseolus vulgaris L. cv. Magnum) cultivated in pots under natural light-dark cycles. Electron microscopic, proteomic and fluorescence kinetic and imaging methods were used to study the photosynthetic apparatus and its activity. Under-soil shoots at 0–2cm soil depth featured chloroplasts with...

article

Comparison of thylakoid structure and organization in sun and shade Haberlea rhodopensis populations under desiccation and rehydration

Éva Sárvári, Gergana Mihailova, Ádám Solti, Áron Keresztes, more

Journal of Plant Physiology > 2014 > 171 > 17 > 1591-1600

The resurrection plant, Haberlea rhodopensis can survive nearly total desiccation only in its usual low irradiation environment. However, populations with similar capacity to recover were discovered recently in several sunny habitats. To reveal what kind of morphological, structural and thylakoid-level alterations play a role in the acclimation of this low-light adapted species to high-light environment...

article

Changes induced by cadmium stress and iron deficiency in the composition and organization of thylakoid complexes in sugar beet (Beta vulgaris L.)

Brigitta Basa, Giuseppe Lattanzio, Ádám Solti, Brigitta Tóth, more

Environmental and Experimental Botany > 2014 > 101 > Complete > 1-11

In intact plants, Cd-induced Fe deficiency is thought to play a role in the toxic effects of Cd on photosynthesis. To investigate the contribution of the Cd-induced Fe deficiency to Cd stress symptoms we studied the composition and organization changes of thylakoid pigment–protein complexes by two-dimensional Blue Native-SDS gel electrophoresis and mass spectrometry, in parallel to functional changes,...

article

Functional characterization of the chloroplast ferric chelate oxidoreductase enzyme

Ádám Solti, Brigitta Müller, Viktória Czech, Éva Sárvári, more

New Phytologist > 202 > 3 > 920 - 928

Iron (Fe) has an essential role in the biosynthesis of chlorophylls and redox cofactors, and thus chloroplast iron uptake is a process of special importance. The chloroplast ferric chelate oxidoreductase (cFRO) has a crucial role in this process but it is poorly characterized.To study the localization and mechanism of action of cFRO, sugar beet (Beta vulgaris cv Orbis) chloroplast envelope fractions...

article

Uptake and incorporation of iron in sugar beet chloroplasts

Ádám Solti, Krisztina Kovács, Brigitta Basa, Attila Vértes, more

Plant Physiology and Biochemistry > 2012 > 52 > Complete > 91-97

Chloroplasts contain 80–90% of iron taken up by plant cells. Though some iron transport-related envelope proteins were identified recently, the mechanism of iron uptake into chloroplasts remained unresolved. To shed more light on the process of chloroplast iron uptake, trials were performed with isolated intact chloroplasts of sugar beet (Beta vulgaris). Iron uptake was followed by measuring the iron...

article

Cd affects the translocation of some metals either Fe-like or Ca-like way in poplar

Ádám Solti, Éva Sárvári, Brigitta Tóth, Brigitta Basa, more

Plant Physiology and Biochemistry > 2011 > 49 > 5 > 494-498

In plants, Cd causes perturbation of root metal uptake and is known to interfere with the metal translocation to the shoot. The most significant effect is the strongly reduced transport of Fe. Fe accumulation in roots under Cd stress revealed that it is not the Fe acquisition but the Fe loading to xylem elements that is blocked by Cd, which can be a result of competition between Fe and Cd for the...

article

Impact of moderate Fe excess under Cd stress on the photosynthetic performance of poplar (Populus jacquemontiana var. glauca cv. Kopeczkii)

Éva Sárvári, Ádám Solti, Brigitta Basa, Ilona Mészáros, more

Plant Physiology and Biochemistry > 2011 > 49 > 5 > 499-505

Cadmium interference with Fe nutrition has a strong impact on the development and efficiency of the photosynthetic apparatus. To shed more light on the interaction between Fe and Cd, it was studied how iron given in moderate excess under Cd stress affects the development and functioning of chlorophyll–protein complexes. Poplar plants grown in hydroponics up to four-leaf stage were treated with 10μM...

article

Cd-Fe interactions: Comparison of the Effects of Iron Deficiency and Cadmium on Growth and Photosynthetic Performance in Poplar

Éva Sárvári, L. Gáspár, Á. Solti, Ilona Mészáros, more

Acta Biologica Hungarica > 2010 > 61 > 1 > 136-148

To check the importance of Cd-induced iron deficiency in Cd stress, symptoms of Cd stress were compared with those of iron deficiency or the combination of these two stresses. Poplar plants grown in hydroponics with Fe-EDTA (e) or Fe-citrate (c) up to four-leaf stage were treated for two weeks either by the withdrawal of iron (Fedef), or supplying 10 μM Cd(NO₃)₂ in the presence (Cad) or absence of...

article

Preferential regeneration of the NADPH: protochlorophyllide oxidoreductase oligomer complexes in pea epicotyls after bleaching

Andrea Szenzenstein, Annamária Kósa, Katalin Solymosi, Éva Sárvári, more

Physiologia Plantarum > 138 > 1 > 102 - 112

The regeneration and stability of the NADPH:protochlorophyllide oxidoreductase (POR, EC 1.3.1.33) enzyme complexes were studied in bleached epicotyls of 9‐day‐old dark‐germinated pea (Pisum sativum L. cv. Zsuzsi) seedlings. Middle segments were illuminated with 1300 µmol m⁻² s⁻¹photon flux density (PFD) white light and subsequently incubated in total darkness for 4–24 h at 24°C. Almost the full amount...

article

Photosynthetic activity of homoiochlorophyllous desiccation tolerant plant Haberlea rhodopensis during dehydration and rehydration

Katya Georgieva, Zoltan Szigeti, Eva Sarvari, Laszlo Gaspar, more

Planta > 2007 > 225 > 4 > 955-964

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 CO₂assimilation rate, chlorophyll fluorescence parameters, thermoluminescence, fluorescence...

article

Presence of ‘PSI free’ LHCI and monomeric LHCII and subsequent effects on fluorescence characteristics in lincomycin treated maize

László Gáspár, Éva Sárvári, Fermín Morales, Zoltán Szigeti

Planta > 2006 > 223 > 5 > 1047-1057

The cause of the strong non-photochemical fluorescence quenching was examined in maize (Zea mays L.) plants that were treated with lincomycin during the 72 h period of greening. They were deficient in core complexes but seemed to contain the full complement of antennae. The following results were obtained: (1) High F _o could not be attributed to the dark reduction of Q _A but to the presence of...

article

Characterization of the stimulating effect of low-dose stressors in maize and bean seedlings

Péter Nyitrai, Károly Bóka, László Gáspár, Éva Sárvári, more

Journal of Plant Physiology > 2003 > 160 > 10 > 1175-1183

The effect of some more or less harmful compounds like Cd, Pb, Ni, Ti salts and DCMU at low concentrations on the development of chloroplasts in maize and bean seedlings was investigated. Chlorophyll content, chlorophyll a/b ratio, photosynthetic activity ( ¹⁴ CO ₂ fixation), chlorophyll-protein composition of thylakoid membranes, fluorescence spectra of chloroplasts, fluorescence...

article

Responses of the photosynthetic system and peroxidase activity to the rooting conditions of oak micropropagation

István Király, Ildikó Balla, Júlia Jakab, László Tamás, more

Plant Cell, Tissue and Organ Culture (PCTOC) > 2001 > 66 > 2 > 155-158

The effects of indole butyric acid (IBA) concentration and the duration of the plant growth regulator (PGR) treatment on the rooting ability, peroxidase level and photosynthetic activity of young Quercus robur L. plants were studied. Four-week-old oak shoots were transplanted to rooting media supplemented with 10 or 20 μM IBA. After 2, 3, 4, 5 or 7 days the shoots were transplanted again to a fresh,...

article

Effects of Pb and Cd on Cucumber Depending on the Fe-Complex in the Culture Solution

Ferenc Fodor, Éva Sárvári, Ferenc Láng, Zoltán Szigeti, more

Journal of Plant Physiology > 1996 > 148 > 3-4 > 434-439

Modifying effects of EDTA and citrate as Fe(III)-complexes on Pb-and Cd-toxicity were investigated with cucumber (Cucumis sativus L.) grown in culture solution. Pb and Cd were applied in lO μM concentration. Pb and Cd inhibited the growth of plants with Fe-citrate but with Fe-EDTA only Cd did. Chlorophyll content of Cd-treated plants-independently on the Fe-complex-was very low similarly to the iron...

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