Browsing by Author "Ellialtioglu, Sebnem"

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Determination of Anti-Oxidant Activities in Some Melon (Cucumis Melo L.) Varieties and Cultivars Under Salt Stress
(Taylor & Francis Ltd, 2006) Yasar, Fikret; Kusvuran, Sebnem; Ellialtioglu, Sebnem
The response of the antioxidant system to salt stress was studied in leaves of seedlings of four Turkish melon (Cucumis melo L.) varieties 'Besni', 'Yuva', 'Midyat' and 'Semame' and three melon cultivars 'Ananas', 'Galia C8' and 'Galia F1'. The anti-oxidant capability of plants was determined by measuring ascorbate peroxidase (APX) and glutathione reductase (GR) activities together with levels of the anti-oxidant, ascorbic acid (AA). Salt treatment increased APX activities in stress-tolerant 'Galia C8' and 'Galia F1' and in moderately tolerant 'Besni', 'Midyat' and 'Semame'. These increases were greater in salt-tolerant cultivars. On the other hand, salt treatment did not cause a significant increase in APX activity in the salt-sensitive cvs. 'Yuva' and Ananas'. GR activity increased in all varieties and cultivars grown under saline conditions compared to control plants. Increases in GR activities were higher in salt-tolerant and moderately-tolerant varieties than in salt-sensitive ones. Likewise, AA contents increased with salt treatment in all varieties and cultivars except the salt-sensitive 'Ananas'. The data indicate that melon seedlings respond to salt-induced oxidative stress by increasing both their enzymatic and non-enzymatic anti-oxidant defense systems. These increases were most clear in the salt-tolerant cultivars.
The Effect of Salt Stress on Growth, Chlorophyll Content, Lipid Peroxidation and Antioxidative Enzymes of Pumpkin Seedling
(Academic Journals, 2011) Sevengor, Senay; Yasar, Fikret; Kusvuran, Sebnem; Ellialtioglu, Sebnem
Salinity is a major abiotic stress reducing the yield of a wide variety of crops all over the world. In order to investigate the antioxidant enzymes activity of four pumpkin genotypes (Iskenderun-4, AB-44, CU-7 and A-24) in response to salinity grown in hydroponic culture, 4 to 5 true leaf stages of pumpkin seedlings were subjected to 100 mM NaCl for 7 days. Salt stress induced changes in antioxidant enzymes, SOD, CAT, GR and APX, total chlorophyll content, lipid peroxidation and root and shoot fresh weight were measured. Salt treatment decreased root and shoots weight, chlorophyll content in salt sensitive genotypes more than salt tolerant genotypes. The four genotypes showed an increase in malondialdehyde (MDA) content under salt condition, but the increase in sensitive genotypes (CU-7 and A-24) were higher than that in salt tolerant genotypes (Iskenderun-4, AB-44). SOD, CAT, GR and APX activities increased salt stress. However these increases were higher in salt tolerant Iskenderun-4, AB-44 than salt sensitive CU-7 and A-24. These results indicate that pumpkin genotypes respond to salt induced oxidative stress by enzymatic defense systems.
Effects of Jasmonic Acid and Salt Applications on Antioxydative Enzyme Activities of the Eggplant Seedlings Grown in Vitro Culture
(Elsevier Sci Ltd, 2011) Gunalp, Banu; Horasan, Ozge; Yasar, Fikret; Kusvuran, Sebnem; Tipirdamaz, Rukiye; Ellialtioglu, Sebnem
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.
Responses of Some Melon (Cucumis Sp.) Genotypes To Salt Stress
(Ankara Univ, Fac Agr, 2007) Kusvuran, Sebnem; Ellialtioglu, Sebnem; Abak, Kazim; Yasar, Fikret
The aim of this research is to identify differences in salt tolerance of melon genotypes and the possibility of using plant biomass values and degree of ion accumulation of leaves to determine salt tolerance. In addition, the increase in MDA amount of leaves on salt stress was evaluated. 36 different genotypes were identified according to different parameters in respect to salt tolerance and susceptibility to salinity, correlation coefficients among these characters were determined, It was observed that salt damage in melons is probably the result of toxic effects of Na+ and Cl- ions and the genotypes having low amounts of these ions are more tolerant. Midyat, Besni and Semame varieties were determinad as salt tolerant melon genotypes; Ananas and Yuva melon cultivars were most sensitive to salt stress.