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Öğe Biochemical effects of drought stress on two Turkish watermelon varieties are different and influenced by nitric oxide(ELSEVIER SCIENCE BV, 2016) Hamurcu, Mehmet; Hakki, Erdogan Esref; Demiral, Tijen; Gezgin, Sait[Abstract not Available]Öğe Determination of reliable house keeping gene(s) for qPCR in maize under different boron dosages(ELSEVIER SCIENCE BV, 2014) Can, Hasan; Hamurcu, Mehmet; Demiral, Tijen; Pandey, Anamika; Khan, Mohd Kamran; Kayis, Seyit Ali; Avsaroglu, Zuhal Zeynep[Abstract not Available]Öğe Effect of nitric oxide on the tolerance mechanism of bread wheat genotypes under drought stress(ELSEVIER SCIENCE BV, 2014) Hamurcu, Mehmet; Demiral, Tijen; Calik, Merve; Avsaroglu, Z. Zeynep; Celik, Ozgur; Hakki, Erdogan E.; Topal, Ali[Abstract not Available]Öğe Effect of nitric oxide on the tolerance mechanism of bread wheat genotypes under salinity stress(ELSEVIER SCIENCE BV, 2014) Hakki, Erdogan Esref; Hamurcu, Mehmet; Demiral, Tijen; Avsaroglu, Zuhal Zeynep; Calik, Merve; Zengin, Mehmet; Topal, Ali[Abstract not Available]Öğe The effects of toxic level boron treatments on the bio-chemical features of Puccinellia distans(CURRENT BIOLOGY LTD, 2011) Hamurcu, Mehmet; Demiral, Tijen; Gezgin, Sait; Caglar, Hayriye; Kizmaz, Veysi; Hakki, Erdogan Esref[Abstract not Available]Öğe Evaluation of serine carboxypeptidase (PsCP) gene expression in Pisum arvense L. grown under different boron levels(ELSEVIER SCIENCE BV, 2012) Hakki, Erdogan Esref; Tamkoc, Ahmet; Hamurcu, Mehmet; Can, Nimet; Demiral, Tijen; Gezgin, Sait; Ozdemir, Canan[Abstract not Available]Öğe Implication of nitric oxide on growth and development of wheat under drought conditions(ELSEVIER SCIENCE BV, 2014) Demiral, Tijen; Hamurcu, Mehmet; Avsaroglu, Zuhal Zeynep; Calik, Merve; Almas, Semra; Hakki, Erdogan Esref; Topal, Ali[Abstract not Available]Öğe Induced anti-oxidant activity in soybean alleviates oxidative stress under moderate boron toxicity(SPRINGER, 2013) Hamurcu, Mehmet; Sekmen, Askim Hediye; Turkan, Ismail; Gezgin, Sait; Demiral, Tijen; Bell, Richard W.The effect of B toxicity on antioxidant responses of soybean (Glycine max) cv. Athow was investigated by growing plants for 43 days at 0.2 (control), 2 and 12 mg B kg(-1). At the end of the treatment period, shoot growth, lipid peroxidation level, the activities of antioxidant enzymes including superoxide dismutase (SOD), peroxidase (POX), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR), and their isoenzymes in leaves were measured. Boron concentration in leaves was significantly increased by the increasing levels of B treatment from 43 to 522 mg kg(-1), and shoot dry matter was depressed at 12 mg B kg(-1). Significant increases in SOD, CAT, and APX activities were determined in leaves under 12 mg B kg(-1); however, GR activities were decreased while POX activity was unchanged. Increased enzymic antioxidant activity arose from a combination of newly formed isoenzymes and activation of existing isoenzymes. By contrast, SOD and GR activities were decreased by 2 mg B kg(-1) concentration as compared to the control groups while POX activity was increased and the activity of CAT did not change. Malondialdehyde content increased under 2 mg B kg(-1) but decreased under 12 mg B kg(-1). These results suggest that higher antioxidant activity observed under 12 than at 2 mg B kg(-1) provided higher free radical-scavenging capacity, and thus a lower level of lipid peroxidation in Athow. While the induction of increased antioxidant activity was related to internal boron levels, the signaling and coordination of responses remain unclear.Öğe Oxidative stress responses in watermelon (Citrullus lanatus) as influenced by boron toxicity and drought(LITHUANIAN RESEARCH CENTRE AGRICULTURE & FORESTRY, 2015) Hamurcu, Mehmet; Demiral, Tijen; Hakki, Erdogan Esref; Turkmen, Onder; Gezgin, Sait; Bell, Richard W.This study aimed to investigate the effect of different boron (B) treatments on drought tolerance of watermelon plants. Drought tolerant Citrullus lanatus (Thunb.) Matsum. et Nakai genotype 'Kar 98' was grown in controlled greenhouse conditions hydroponically and exposed to drought stress by applying PEG 6000 (polyethylene glycol) in the presence of three boron dosages: 0.05, 0.25 and 1.25 mM. Growth parameters (fresh weight, dry weight and lengths of shoot and roots), leaf relative water content, boron accumulation, lipid peroxidation level and activities of superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR) enzymes were determined as well as the accumulation of hydrogen peroxide (H2O2) and hydroxyl (center dot OH)-scavenging activity were assayed. Increasing dosages of boron alone caused more severe growth reduction than combined with PEG 6000-induced drought stress. Induced drought stress caused less accumulation of boron in leaves and roots. B concentration of 1.25 mM caused lipid peroxidation in a reactive oxygen species-independent manner and drought stress-induced lipid peroxidation was alleviated by increasing B dosages. Induced glutathione reductase activity under the combination of 1.25 mM B and PEG 6000-induced drought stress seemed an important physiological response in 'Kar 98' plants against multiple stresses.Öğe Physiological responses of two contrasting watermelon genotypes exposed to drought and nitric oxide(ELSEVIER SCIENCE BV, 2016) Hakki, Erdogan Esref; Hamurcu, Mehmet; Gezgin, Sait; Demiral, Tijen[Abstract not Available]Öğe Toksisite düzeyinde bor uygulamalarının besin çözeltisi koşullarında hibrit mısır çeşitlerinin anatomik özellikleri üzerine etkisi(2016) Hamurcu, Mehmet; Özdemir, Canan; Kocabaş, Okan; Hakkı, Erdoğan E; Demiral, Tijen; Gezgin, SaitBu çalışma farklı düzeylerde uygulanan borun bor toksisitesine toleranslı RX 770 ve hassas TTM 81.19 mısır çeşitlerinin kök ve gövde anatomisine etkilerini belirlemek amacıyla yapılmıştır. Bunun için in vitro'da hibrit mısır çeşitlerine 1/5 oranında seyreltilmiş hoagland çözeltisi ile kontrol (0,3 mg.L-1 B), 2,5, 25, 50 ve 100 mg.L-1 seviyelerinde bor uygulanmıştır. Bitkiler ilk üç yapraklı evrelerinde araştırmada belirtilen seviyelerde borun uygulanmaya başlandığı 0. günde, daha sonra bor uygulamasını takip eden günden itibaren ilk tepkilerin görülmeye başlandığı gün olan 5. Günde, son olarak da 10. günde alınan örneklerde kök, gövde ve yaprakların anatomik özellikleri belirlenmiştir. Elde edilen sonuçlar artan seviyelerde bor uygulamaları ile kontrol uygulamalarına göre her iki mısır çeşidinde de kök metaksilem, gövde trake ve korteks çaplarının önemli düzeylerde azaldığını göstermiştir. Bu azalmalar bor toksitesine toleranslı RX 770 çeşidinde hassas TTM 81.19 çeşidine göre daha fazla olmuştur