Browsing by Author "Yasar, Ozlem"

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Antioxidant Enzyme Activities and Lipidperoxidation Amount of Pea Varieties (Pisum Sativum Sp Arvense L.) Under Salt Stress
(Parlar Scientific Publications (p S P), 2016) Yasar, Fikret; Uzal, Ozlem; Yasar, Ozlem
This study examined the responses to salt stress of 5 pea genotypes, B-6, 110121, 1103220, 101917 and 10431 and two pea cultivars Winner and Karina under 75 mM NaCl salt treatment. Pea genotypes were selected from among cross-breed varieties of wild pea and white flowered pea growing different regions of Anatolia. While salinity reduced significantly fresh weight of BA, 110121, it did not cause a significant change fresh weight of the other pea varieties used in this study as compared to the control. Lipid peroxidation was increased by NaCl treatment in all varieties. This increase was more pronounced in BA and 11121 relatively to other pea varieties. On the basis of plant growth and MDA contents, B-6 and 110121 appeared as being more salt sensitive than other varieties When compared to control, salt treatment increased antioxidant enzyme activities in all pea varieties used in this study. The increases were greater in salt tolerant 1103220, 101917 and 10431 pea varieties than salt sensitive BA and 110121 varieties. These results suggest that pea seedlings respond to salt-induced oxidative stress by increasing their antioxidant defense systems.
Effects of Different Doses of Exogenous Gibberellic Acid on Total Plant Weight, Lipid Peroxidation, and Antioxidant Enzyme Activities of Eggplant Seedling Under Salt Stress
(Parlar Scientific Publications (p S P), 2019) Uzal, Ozlem; Yasar, Fikret; Yasar, Ozlem
The present study investigated the effects of different doses of gibberellic acid (GA(3)) on Aydin siyahi eggplant variety exposed to salt stress. The study was conducted to determine how applications affect plant development and metabolic activity. Eggplant seedlings were grown in a temperature-controlled hydroponic system in Hoagland nutrient solution. When they were 3 weeks old, they were exposed to salt stress (100 mM NaCl). Subsequently, they were treated with different doses of GA(3) (2.5, 5.0, 7.5, and 10 ppm). Leaves were harvested on the 15th day of the experiment. Fifteen days after the induction of salt stress, physiological (total plant weight) and biochemical (antioxidant enzyme activity, malondialdehyde [MDA] content, and chlorophyll content) changes were measured to determine the effect of the GA(3) treatments on plant growth and metabolic activity. In the NaCl plus high GA(3) treatment, the plant chlorosis level and degree of salt-induced damage decreased. In the NaCl plus high GA(3) (10 ppm treatment), plant development slowed due to salt-induced stress, but symptoms of stress, such as curling or chlorosis, were not detected in plant leaves. All doses the GA(3) treatments reduced antioxidant enzyme activities and MDA contents. In summary, the application of GA(3) to eggplant partially suppressed the adverse effects of salt stress on plant development and metabolic activities, and this effect was more apparent at a GA(3) dose of 10 ppm. Therefore, GA(3) may provide direct and indirect protection against salt stress.
The Effects of Humic Acid Application on The Nutrient Contents and Heavy Metals in Organs of Marigold (Tagetes Erecta L.)
(Parlar Scientific Publications (p S P), 2017) Sonmez, Ferit; Alp, Sevket; Yasar, Ozlem
This study investigated the effects of humic acid doses applied directly to the soil (control, 10, 20, 40 kg da(-1)) wherein yellow and orange tagates species were grown. The effect of humic acid on the concentrations of macro elements, micro elements and heavy metals in stalk, leave and flower were determined. At the end of the study, it was observed that applying humic acid had a significant effect of 0.1% on the concentrations of N, P, K, Mg, Na, Fe, Zn, Cu, Mn, Cd, Ni, and Pb. Additionally, there were significant differences seen in the nutritional elements content in plant organs, with N, K, Ca, Mg, Na, Fe, Zn, Cu, Mn, Cd, Ni, and Pb at a percentage of 0.1% and P at a percentage of 1%. It was observed that there was a significant difference of 0.1% in regards to the nutrient content of the elements K, Na, Zn, Cu, and Pb. There were no observable significant differences in the amount of the other elements. To conclude, it was determined that applying humic acid had a significant effect on the element contents of different tagates species as well as the nutritional element and heavy metal contents of plant species and their organs.
Enzyme Activities of Certain Pumpkin (Cucurbita Spp) Species Under Drought Stress
(Parlar Scientific Publications (p S P), 2014) Yasar, Fikret; Uzal, Ozlem; Kose, Serif; Yasar, Ozlem; Ellialtioglu, Sebnem
The aim of this study is to investigate the relationship between the drought tolerance capacity and antioxidant enzyme activity of 38 genotypes of different pumpkin species from different regions of Turkey. The seedlings from 38 different genotypes were put into pots containing Hoagland's solution to be stored in cultivation rooms under controlled climatic conditions. A 15% polyethylene glycol 6000 (PEG 6000) solution was added to the Hoagland's solution to create an osmotic potential equivalent to -0.60 M=Pa for the drought test application. The leaf weights were determined following the test under drought and control conditions. The relative water content, chlorophyll content, and antioxidative enzyme activities (superoxide dismutase, catalase, and ascorbate perwddase) were investigated. As a result, it was observed that the enzyme activities are extremely vital in the drought tolerance of the pumpkin genotypes; such as under dry conditions, the drought tolerant pumpkin genotypes use antioxidative enzymes more actively compared to the drought susceptible genotypes.
Root, Stem, and Leaf Ion Accumulation in Drought-Stressed Green Bean (Phaseolus Vulgaris L.) Genotypes Treated With Peg-6000
(Parlar Scientific Publications (p S P), 2014) Yasar, Fikret; Uzal, Ozlem; Yasar, Ozlem; Ellialtioglu, S. Sebnem
The objective of this investigation was to determine the relationship between drought stress and the ion accumulation as well as distribution mechanisms of bean genotypes of the Phaseolus vulgaris L. species, namely, Gevas Bodur 64 (GB64), Samsun 100 (S100), Samsun 95 (S95), 4F-89F, Gevas Sink 57 (GS57), Gevas Sink 26 (GS26), Samsun 96 (S96), Sink Barbunya (SB), Kirkgunluk (KG), and Oturak Barbunya (OB), collected from various regions of Anatolia, Turkey. The seedlings of 10 different bean genotypes were cultivated in containers containing Hoagland's nutrient solution in a cultivation chamber, the climate conditions of which were kept under control. In order to generate drought stress, 10% (w/v) polyethylene glycol 6000 (PEG-6000), corresponding to an osmotic potential of -0.40 MPa, was added to the nutrient solution. After the application, the accumulation of potassium (K), calcium (Ca), iron (Fe), zinc (Zn), and manganese (Mn) ions in the roots, stems, and leaves of the plants was determined. There were differences among the genotypes in terms of ion uptake, ion accumulation, and ion distribution. It was concluded that plants protected themselves from negative effects of drought stress via balanced ion distribution among their organs.