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Öğe Antioxidant Enzyme Activity Affected by High Boron Concentration in Sunflower and Tomato Seedlings(Taylor & Francis Inc, 2011) Keles, Yuksel; Ergun, Nuray; Oncel, IsilAgricultural productivity could be limited by toxic levels of boron (B) in soils. However, tolerance to B toxicity varies between plant species. This study investigated the effect of high B concentrations on the growth and antioxidant enzyme activity of relatively B-tolerant sunflower (Helianthus annuus L.) and B-sensitive tomato (Lycopersicon esculentum Miller) seedlings. The seedlings were grown in plastic pots supplemented with 0, 20, 40, and 60 g B g-1 [from boric acid, B(OH)3] for 3 weeks. Root and shoot length together with the dry weight of the harvested plants were measured. Boron analyses were carried out on the soil samples and on root, stem, and leaf samples. The B concentrations were determined to fall in the range of 112-475 g B g-1 leaf tissue in B-sensitive tomatoes and the range of 203-995 g B g-1 in B-tolerant sunflowers. Root length was unchanged in the sunflower but decreased by 38% in the tomato seedlings relative to the control. Shoot length was decreased by 28% in sunflower and by 43% in tomato seedlings at treatment 60 g B g-1 relative to controls. In the tomato leaves, glutathione reductase (GR) and superoxide dismutase (SOD) activity increased but catalase (CAT) activity decreased with greater B concentrations. In sunflower leaves, activities of three enzymes increased but CAT and GR activity began to decrease at applications greater than 40 g B g-1. These results indicate that high B concentrations in leaves have some significant effect on the antioxidant enzyme activity of plants. However, the power of antioxidant defence is not sufficient to remove B toxicity symptoms such as growth decrease.Öğe Competitive biosorption of different forms of lead [Pb(NO3)2 and Pb(CH3COO)2] on growth, biomass and proline in Spirulina platensis (Cyanophyta)(Academic Journals, 2011) Sayin, Selin; Yilmaz, Ayse Bahar; Ergun, Nuray; Turan, FundaSpirulina platensis growth parameters [chlorophyll a (chl a) and dry-wet weight] effects on proline content, lead accumulation and the combined effect of the different forms of lead [Pb (NO3)(2), Pb (CH3COO)(2)] and pH (6 to 8) were investigated for 192 h. The accumulation and form of lead were determined to be effective on growth parameters. While the highest chl a value (562.37 mu gl(-1)) and lead accumulation (58.74 mu gg(-1)) were found in medium with 30 mgl(-1) Pb (CH3COO)(2) and pH 6, the highest proline content was found in 30 mgl(-1) Pb (NO3)(2) and pH 6. This study depict an inverse relationship between lead accumulation in the test algae and low pH which suggests that proline might be produced at the expense of the material(s) required for the development of S. platensis.Öğe EFFECTS OF COPPER AND CHROMIUM AND HIGH TEMPERATURE ON GROWTH, PROLINE AND PROTEIN CONTENT IN WHEAT SEEDLINGS(Bangladesh Botanical Soc, 2013) Muslu, Ahmet; Ergun, NurayEffects of interactions between high temperature and chromium (Cr(VI)) and copper (Cu) on wheat (Triticum aestivum L. cv. Dagdas 94) seedlings were investigated. High concentrations of Cr and Cu at 40 degrees C decreased the root and shoot length and dry weight. The total chlorophyll content was decreased at 30 mu M Cr + 40 degrees C. At the high Cr and Cu concentrations, carotenoid content was increased compared to that of control groups. Heavy metal treatment increased proline content but decreased that of soluble protein. In addition, chromium showed greater toxic effects on growth and biochemical parameters than that of Cu.Öğe Effects of waterlogging and nitric oxide on chlorophyll and carotenoid pigments of wheat(WFL Publisher Ltd., 2013) Ozcubukcu, Serhat; Ergun, NurayIn this study, waterlogging (Wl) of wheat (Triticum aestivum L. cv. Dogankent, Ducula-4) seedlings and waterlogging-nitric oxide (Wl-NO) interactions were investigated. Chlorophyll a (Ch a), chlorophyll b (Ch b), total chlorophyll (Ch a + b) and the amount of carotenoids were determined. Waterlogging conditions caused significant amount of inhibition on Ch a, Ch b, Ch a + b, and carotenoid contents depending on application time in both cultivars. However, Wl-NO applications eliminated the inhibitory effect of Wl in both cultivars. Ducula-4 seedlings are known to be tolerant to waterlogging conditions, and the amount of chlorophyll and carotenoids were higher in Ducula-4 than in Dogankent seedlings. In addition, NO applications largely eliminated the negative effects of Wl on Ch b, Ch a + b, and carotenoid contents in Ducula-4 variety. In that case, it can be suggested that the NO application significantly improves the negative effects of Wl on the Ducula-4 variety.Öğe EFFECTS OF ZN AND K NUTRITIONAL STATUS ON PROTEIN CONTENT, LIPID PEROXIDATION AND ANTIOXIDATIVE ENZYME ACTIVITIES UNDER THE SALINITY STRESS IN DIFFERENT WHEAT GENOTYPES(Parlar Scientific Publications (P S P), 2014) Karanlik, Sema; Tiryakioglu, Murat; Ergun, NurayA solution culture experiment was conducted with different zinc (Zn) (2x10(-8) M and 10(-6) M) and potassium (K) (100 mu M and 2 mM) level using two bread wheat (Triticum aestivum L.), Dagdas and ES-14 and two durum wheat (Triticum durum L.), Kunduru-1149 and Selcuklu-97 genotypes. After 7 days, nutrient solution was salinized by two NaCl levels (0 and 150 mM NaCl) and the effect of Zn and K supplements on protein content, lipid peroxidation (LPX) level, ascorbate peroxidase (APX) and catalase (CAT) activities were evaluated on the 8th day after salinization. Salinity stress led to significant increases in LPX and decreases in protein content. Salinity-induced levels of LPX were significantly reduced by Zn and K supplements and especially by Zn-K supplement in combine. This effect was more significant in durum wheat genotypes. Zinc and K supplements either alone or together elevated the protein content of plants; however this effect was more significant under Zn supplements and in durum wheat genotypes. It was found that, salinity stress significantly enhanced the activities of APX and CAT. Under salinity stress, Zn deficiency significantly stimulated activities of APX and CAT however, such an effect was not found with K. Results showed that detrimental effects of salinity stress in plants could be mitigated with K and Zn supplements by limiting the lipid peroxidation and protein degradation.Öğe Heat shock proteins and their physiological roles(Kafkas Univ, Veteriner Fakultesi Dergisi, 2007) Askar, Tuenay Kontas; Ergun, Nuray; Turunc, VeciheHeat shock proteins (HSPs), also called stress proteins, are a group of proteins that are present in all cells in all life forms. The synthases of these proteins are induced when a cell undergoes various types of environmental stresses like heat, cold and oxygen deprivation. In this article we summarized the structure and physiology of heat shock proteins which is an important research area for biology and medicine.Öğe Investigation of the effects of environmental stresses on the development and yield of wheat seedlings with physiological and biochemical parameters and some gene expressions(Elsevier, 2020) Ergun, NurayIn this chapter, the effects of climate changes, in particular, on wheat yield and on the sustainability of food security in Turkey will be discussed. Climate change is one of the major problem affecting the growth and development of plants in agricultural areas. There are many stress factors (drought, temperature, flood, etc.) that arise due to this problem. Due to these stress factors mentioned, the yield of wheat in the world and Turkey is affected negatively by the day. Growth and productivity loss due to climate change,1. Root and shoot development in wheat 2. Changes in photosynthetic pigments 3. Changes in antioxidant enzymes in seedlings 4. Changes in various biochemical parameters 5. Changes in the expression of some genes depending on the stress will be explained with the main headings. © 2020 Elsevier Inc. All rights reserved.Öğe Kuraklık Stresinde Hidrojen Peroksit (H2O2) Ön Uygulamasının Buğday Fidelerinde, Büyüme ve Katalaz Üzerine Etkileri(2022) Soylu, Oğuz; Ergun, Nuray; Çalıcı, Berna; Toraman, Pelin ŞengülBu araştırmada, buğday (Triticum monococcum L. cv. Siyez, Triticum aestivum L. cv. Ahmetağa) fidelerinde üzerine; kuraklık (K), hidrojen peroksit (H2O2) ve kuraklık + hidrojen peroksit uygulamalarının, fidelerin büyüme ve antioksidant enzimler üzerine etkileri araştırılmıştır. Sürgün boyu, sürgün taze ağırlığı, sürgün kuru ağırlığı, klorofil–a ( kl-a) miktarı, klorofil b ( kl-b) miktarı, klorofil a/b miktarı, katalaz enzim aktivitesi (CAT) ve antosiyanin miktarları incelenmiştir. Çalışmamızda K ve K + H2O2 uygulaması hem atasal buğday çeşidi olan Siyez hem de Ahmetağa çeşidinde sürgün boyu, sürgün taze ağırlığı ve sürgün kuru ağırlığında önemli derecede azalmaya neden olduğu belirlenmiştir. Siyez çeşidi buğday fidelerinde kuraklık ve K + H2O2 uygulamalarının buğday fidelerinde klorofil içeriğinde azalma meydana gelmiştir. Ahmetağa çeşidi buğday fidelerinde kuraklık uygulamaları K+ H2O2 ve sadece H2O2 uygulaması klorofil a ve klorofil b oranında bir miktar artışa neden olmuştur. Çalışmamızda Siyez çeşidinde yapılan tüm uygulamalarda CAT enzim aktivitesi üzerinde kontrole göre azalmalar tespit edilmiştir. Ahmetağa çeşidinde K ve H2O2 uygulamalarında bir miktar azalma meydana gelmiştir. Serbest antosiyanin miktarında sadece Siyez çeşidi buğday fidelerine yapılan kuraklık uygulamasında bir miktar artış meydana gelirken Ahmetağa çeşidinde bütün uygulamalarda önemli bir değişiklik gözlenmemiştir. H2O2, süperoksit, hidroksil vb. radikallerin yok edilmesinde de görev aldığı bilinen antosiyaninlerin miktarının Siyez çeşidinde arttığı saptanmıştır. Bu durumda Siyez genotipinde antosiyaninin kuraklıkta oluşan oksidatif strese karşı korumada rol oynayabileceği düşünülmektedir.Öğe Micronutrients (Fe, Mn and Zn) concentration and remobilization in spring wheat organs during grain filling(Gaurav Publications, 2013) Tiryakioglu, Murat; Yildirim, Mehmet; Karanlik, Sema; Ergun, NurayThe trials were conducted during 2008-09 and 2009-10 wheat growing seasons. Four wheat genotypes (Triticum aestivum L.) were grown in field conditions to study Fe, Mn and Zn content in different plant organs during the grain-filling period. Micronutrient contents of plant organs including lower stems, peduncle, lower leaves, flag leaf, rachis, florets and grain were measured at four stages between anthesis and physiological maturity. Analysis of variance showed high genotype and measurement stage effects for all plant organs. Fe contents in stems declined during grain filling, whereas it increased for rachis, florets and grain, and remained constant in leaves. Mn content of plant parts stayed generally constant until grain maturity, except in stems. Zn sharply decreased during grain filling for all plant parts, except grain. The micronutrients remobilization order from plant organs to grain was ZnÖğe Physiological and gene expression differences of wheat varieties under different waterlogging treatments(Elsevier Sci Ltd, 2011) Erayman, Mustafa; Ergun, Nuray; Yilmaz, Ebru Sebnem; Ilhan, Emre; Ozcubukcu, Serhat; Eren, Abdil Hakan; Hancer, Tugce[Abstract Not Available]
