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001-es BibID:BIBFORM068021
Első szerző:Baycu, Gülriz
Cím:Abiotic stress effects on the antioxidative response profile of Albizia julibrissin Durazz. (Fabaceae) / Gülriz Baycu, Sven Erik Rognes, Hakan Özden, Nihal Gören-Saglam, István Csatári, Szilárd Szabó
Megjegyzések:Abiotic stresses (e.g., heavy metals, drought, cold, or combinations) induce oxidative stress with overproduction of reactive oxygen species (ROS). We have investigated the antioxidative responses of Albizia julibrissin Durazz. (silk tree, Fabaceae). Four-month-old plants grown in sand cultures were subjected to various single or sequential treatments involving exposure to cadmium (50-250 ?mol L-1 Cd), lead (1000-5000 ?mol L-1 Pb), chilling at 4 ?C (CH), or drought (DR), for a period of 7?45 days. Leaf extracts were assayed for glutathione peroxidase (GPX), glutathione-disulfide reductase (GR), catalase (CAT), soluble proline (Pro), ascorbate peroxidase (APX), and guaiacol peroxidase (GUAPX). Cd and Pb accumulation in the leaves was also measured. CAT activity decreased strongly with increasing Pb exposure and after CH. It was also found to be reduced after Cd and DR treatments. GR activity increased highly in nearly all treatments, most strongly at high Cd or Pb, after DR + CH, and after CH followed by Cd. GUAPX and GPX showed similar trends of increase. APX activity dropped after CH, but increased after low Cd treatment and in CH + DR sequential stresses. Massive accumulation of soluble Pro occurred after 14?21 days in highly Cd- or Pb-stressed plants. CH or DR acclimation led to some alterations of antioxidative responses, particularly for CAT, GR, and APX. Our data indicate that GSH, GSH-linked redox systems, peroxidases, and Pro are possibly the more important antioxidants under severe stress.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Antioxidative enzymes
Heavy metal
Megjelenés:Brazilian Journal of Botany. - 40 : 1 (2017), p. 21-32. -
További szerzők:Rognes, Swen Erik Özden, Hakan Gören-Saglam, Nihal Csatári István (1986-) (környezetkutató ökológus) Szabó Szilárd (1974-) (geográfus)
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001-es BibID:BIBFORM061352
Első szerző:Baycu, Gülriz
Cím:An Abandoned Copper Mining Site in Cyprus and Assessment of Metal Concentrations in Plants and Soil / G. Baycu, D. Tolunay, H. Ozden, I. Csatari, S. Karadag, T. Agba, S. E. Rognes
Megjegyzések:Mining is an important source of metal pollution in the environment and abandoned mines are extremely restricted habitats for plants. Some plant species growing on metalliferous soils around mine tailings and spoil-heaps are metal-tolerant and accumulate high concentrations of metals. In this investigation, we aimed to perform a research in the CMC-abandoned copper mining area in Lefke-North Cyprus to assess the recent metal pollution in soil and plant systems. We collected 16 soil samples and 25 plant species from 8 localities around the vicinity of tailing ponds. Some concentrations of metals in soil samples varied from 185 to 1023 mg kg-1 Cu, 15.2 to 59.2 mg kg-1 Ni, 2.3 to 73.6 mg kg-1Cd and metals for plants ranged from 0.135 to 283 mg kg- 1 Cu, 0.26 to 31.2 mg kg-1 Ni, 0.143 to 277 mg kg-1 Cd. Atriplex semibaccata, Acacia cyanophylla, Erodium spp., Inula viscosa, Juncus sp., Oxalis pes-caprea, Pistacia lentiscus, Senecio vulgaris and Tragopogon sinuatus accumulated higher concentrations. BCF for Atriplex semibaccata was found very high, for this reason this plant can tentatively be considered as a hyperaccumulator of Cu and Cd, but it needs further investigation for its potential in phytoremediation.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:International Journal Of Phytoremediation. - 17 : 7 (2015), p. 622-631. -
További szerzők:Tolunay, Doganay Ozden, Hakan Csatári István (1986-) (környezetkutató ökológus) Karadag, Seda Agba, Tugce Rognes, Swen Erik
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001-es BibID:BIBFORM061351
Első szerző:Csatári István (környezetkutató ökológus)
Cím:Nitrogen and carbon concentrations in the samples of soil, sediment and Phragmites australis (common reed) from Küçükçekmece Lagoon area (Istanbul, Turkey) / Istvan Csatari, Gülriz Baycu, Ender Makineci, Szilard Szabo, Doganay Tolunay, Gyula Lakatos
Megjegyzések:Küçükçekmece Lagoon in Istanbul (Turkey) receives increasing attention due to its deteriorating water quality and the pollution of the surrounding watershed. In this study, seven sampling points were selected and environmental parameters including lagoon water (pH, electrolytic conductivity), sediment and soil of the littoral zone (pH, electrolytic conductivity, texture, shell content, total carbon and nitrogen concentrations) were measured and the effects of high salinity on the total C, total N, and C/N ratio in different organs of Phragmites australis were discussed. According to the electrolytic conductivity results, our sampling sites can be considered as highly saline environments. Texture analyses have indicated that the sediment and soil samples were mostly sandy with a high sensitivity to pollution discharges. Highest N concentrations were measured in the leaves of Phragmites with an increasing order in the urban, agricultural and industrial sampling sites (1.73-3.29%). N inputs into the highly saline Kü₀cük₀cekmece Lagoon can be associated with different pollution sources and the observed Phragmites australis stands may be favourable for the natural elimination of N in this area.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Fresenius Environmental Bulletin. - 24 : 4 (2015), p. 1558-1567 -
További szerzők:Baycu, Gülriz Makineci, Ender Szabó Szilárd (1974-) (geográfus) Tolunay, Doganay Lakatos Gyula (1949-) (ökológus)
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