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    The Effect of Salts Stress, Some Plant Hormones and SNP Applications on Signal Molecules in Helianthus annuus L. Leaves
    (Kahramanmaras Sutcu Imam Univ, 2018) Kirecci, Oguz Ayhan; Yurekli, Fusun
    In this study, the effects of salt stress, sodium nitoprusside and hormones applications on some signal molecules [nitric oxide (NO), cyclic guanosine monofosfate (cGMP) and calcium (Ca+2)] of sunflower (Helianthus annuus L. cv. Tarsan-1018) plant leaf were investigated. Helianthus annuss L. cv. TARSAN - 1018 seeds were obtained through the Edirne Thrace Agricultural Research Institute. Seeds were irrigated with culture solution for 5 weeks. At the end of the fifth week salt, sodium nitoprusside and hormone applications were performed with foliar application for 72 hours. At the end of 24th and 72nd hours samples were taken. All of signal molecules of leaf tissues of sunflower (Helianthus annuus L. cv. Tarsan-1018) were determined by using analysis kit. Salt stress, sodium nitroprusside and hormone applications caused an increase in the level of NO. Continuation of the administration of IAA and GA resulted in a decrease in the amount of cGMP and Ca+2. Besides of these, salt stress, sodium nitroprusside and hormone applications provided higher NO, cGMP and Ca+2 levels than the control group. The results showed that there was a synergistic effect between hormones and signaling molecules. It has been observed that the signal molecules were regulated against stress conditions.
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    The effects of SNP and some plant hormones on sunflower (Helianthus annuus L.) seedling leaves exposed to salt stress
    (Mattioli 1885, 2019) Kirecci, Oguz Ayhan; Yurekli, Fusun; Yilmaz, Okkse
    In this study, the effects of salt stress, sodium nitoprusside (SNP) and hormones (Abscisic acid, Indol acetic acid and Gibberellic acid) applications on fatty acids concentrations of sunflower (Helianthus annuus L. cv. Tarsan-1018) plant leaf were investigated. Helianthus annuss L. cv. TARSAN - 1018 seeds were obtained through the Edirne Thrace Agricultural Research Institute, in Turkey. Following surface sterilization, the seeds were kept in water with aquarium pomp for 24 hours. The light intensity was 222 mu mol / m(2)s on the leaf surface. Seeds were grown in 16 hours light, 8 hours dark photoperiod. Seeds were irrigated with Hoagland culture solution for 5 weeks. At the end of the fifth week salt, SNP and hormone applications were performed with foliar application for 72 hour. At the end of 72 hours samples were taken. Fatty acid composition of leaf tissues of sunflower (Helianthus annuus L. cv. Tarsan-1018) were determined by using gas chromatography. 300 mM salt application caused decrease concentrations of C16:0, C17:0, C18:1 and C18:3. 100 mu M sodium nitoprusside has reduced the concentrations of C16:0, C17:0, C18:1. Hormone applications. adversely affected fatty acid concentrations. The results show that salt stress, sodium nitoprusside and hormone applications have negative effects on C16:0, C17:0, C18:1 and C18.3 concentrations in Tarsan-1018 sunflower leaf tissues.
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    The fruit extract of three strawberry cultivars prevents lipid peroxidation and protects the unsaturated fatty acids in the Fenton reagent environment
    (Taylor & Francis Ltd, 2012) Ozsahin, Ayse Dilek; Gokce, Zehra; Yilmaz, Okkes; Kirecci, Oguz Ayhan
    In this study, we detected the flavonoid ingredients of three different varieties of strawberry (Fragaria ananassa Duch cultivar Camarosa, Selva and Dorit) grown in Elazig, and we researched on their effects on the radicals DPPH. and OH.. It was detected that in the manipulation of 50-100 mu l extract, it was efficient to turn the DPPH. radical over 85% to DPPH.OH. form. In in vitro environment in which hydrogen peroxide and Fenton reagent were used, it was also detected that the capacity of interception of lipid peroxidation is high. When the level of Malondialdehyde (MDA)-2-thiobarbituric acid was compared with that of the Fenton R group, the level was shown to be decreased in the groups in which a quite distinct level of the extract of strawberry fruit was given (p < 0.001). Depending on the decrease in LPO formation, the amounts of oleic acid and linoleic acid that were added to the reaction environment were preserved in in vitro environment in which the extract of strawberry fruit was added (p < 0.01, p < 0.05 and p < 0.01). Consequently, it has been confirmed that the strawberry fruit that has a scavenging effect against the radicals prevents that lipid peroxidation in in vitro environment.
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    Investigating Inhibitory Effects of Punica granatum Fruit Extracts on Lipid Peroxidation in the Fenton Reagent Environment
    (Asian Journal Of Chemistry, 2012) Ozsahin, Ayse Dilek; Kirecci, Oguz Ayhan; Yilmaz, Okkes; Erden, Yavuz; Bircan, Burak; Karaboga, Zeynep
    In this study, it is aimed to find antioxidant activity of methanolic extract of Punica granatum fruit, by determining alpha,alpha-diphenyl-beta-picrylhydrazyl (DPPH) radical scavenging property and also by determining the capacity to prevent the formation of lipid peroxidation which is found in in-vitro environment that soybean and corn oils are found. The capacity of preventing lipid peroxidation was analyzed in an in vitro environment that oil samples were existed by evaporating methanol phase of extracts. In the experiment, the groups were formed as control group e.g., Fenton reactive, Pomegranate extract + Fenton reactive. It was observed that the lipid peroxidation level formed on the oils had increased at a significant level when compared to Fenton reactive groups according to the control group. When the extract groups are compared (to each other) according to the Fenton reactive group, it was detected that lipid peroxidation level had significantly decreased (p < 0.0001). According to the scavenging activity of alpha,alpha-diphenyl-beta-picrylhydrazyl radical, it was determined that the pomegranate extracts were effective at their highest level at 250-500 mu L (p < 0.0001). It was concluded that Punica granatum effectively decreases the lipid peroxidation level, neutralizes the alpha,alpha-diphenyl-beta-picrylhydrazyl free radical and has a characteristic of conserving the fatty acid content.
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    THE RELATIONSHIP BETWEEN DROUGHT STRESS AND SIGNAL TRANSDUCTION MOLECULES IN SENSITIVE AND RESISTANT WHEAT VARIETIES
    (Parlar Scientific Publications (P S P), 2017) Kirecci, Oguz Ayhan; Yurekli, Fusun
    Nitric oxide (NO) is a key signaling molecule having various physiological functions in plants. Additionally, hydrogen peroxide acts as signaling molecules in plants. The second messenger, cGMP is a significant molecule for many different processes in plants. In the present study, the effects of drought stress and also sodium nitroprusside (SNP) and hydrogen peroxide (H2O2), externally applied at different concentrations, on nitric oxide (NO) levels, nitric oxide synthase (NOS) activity, cyclic GMP (cGMP) levels and hydrogen peroxide (H2O2) content in root tissues of the tolerant (Triticumaestivum L. Dogu-88) and sensitive (Triticum aestivum L. Yildirim) wheat plants were investigated. According to the results, NO level and NOS activity increased in both species. cGMP and NO levels increased. H2O2 content decreased in Dogu-88 plant but increased in Yildirim plant. All data revealed that the results were different in both wheat varieties. The results of the study, including the response of plant root tissues against stress and signal transduction, were found to be different. High NO levels can promote the adaptation to stress.
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    THE RELATIONSHIP BETWEEN NITRIC OXIDE AND PLANT HORMONES IN SNP ADMINISTRATED SUNFLOWER PLANTS UNDER SALT STRESS CONDITION
    (Wydawnictwo Akad Rolniczej W Lublinie, 2016) Yurekli, Fusun; Kirecci, Oguz Ayhan
    Nitric oxide (NO) and sodium nitro prusside (SNP) are striking molecules and play important roles in animals and plants. SNP serves as nitric oxide donor in both group. NO can act free radical and impaires important biomolecules functions beside this it has beneficial effect recovery from salinity, drought etc. NO and SNP are beneficial and protectant molecules in cope with stressfull conditions. In plants these molecules are very important, and regulate many physiological events. In the present study, endogen abscisic acid (ABA), indole acetic acid (IAA), gibberellic acid (GA(3)) and NO levels were investigated in NaCl, SNP and plant growth regulators treated sunflower plant (Helianthus annuus L.) leaves and roots. The content of NO was higher in GA(3) + SNP treated plant leaves at 72 h. The highest IAA level was determined in IAA + SNP treated plant roots at 72 h. In NaCl + ABA treated plant leaves ABA was higher at 72 and GA(3) levels were equal or less than the control group. Our results showed that coadministration of SNP and plant growth regulators cope with salinity stress via elevated internal hormone and NO level versus salinity.