Browsing by Author "Ellialtioglu, S."

Now showing 1 - 2 of 2

Effect of Salt Stress on Antioxidant Defense Systems, Lipid Peroxidation, and Chlorophyll Content in Green Bean
(Maik Nauka/interperiodica/springer, 2008) Yasar, F.; Ellialtioglu, S.; Yildiz, K.
Salt stress-induced changes in antioxidant enzymes, such as catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR), total chlorophyll content, and lipid peroxidation measured as malondialdehyde (MDA) content, in leaves of a green bean genotype Gevas sirsk 57 (GS57) and cv. Fransiz 4F-89 differing in salt tolerance were investigated. Plants were subjected to three salt treatments (0, 50, and 100 mM NaCl) under controlled climatic conditions for 7 days. The salt-sensitive cv. 4F-89 exhibited a decrease in GR activity at all salt treatments, but the salt-tolerant genotype GS57 showed only a slight decrease in GR under 50 mM salt treatment and an increase under 100 mM salt treatment. CAT and APX activities increased with increasing salt stress in both varieties. CAT and APX activities were higher in the salt-tolerant GS57 than salt-ensitive cv. 4F-89. The two varieties showed an increase in MDA content with an increase in salinity, but the increase in sensitive cv. 4F-89 under salt stress was higher than that in salt-tolerant GS57 genotype. The increasing NaCl concentration caused a reduction in the chlorophyll content in cv. 4F-89 but not in GS57.
Ion and Lipid Peroxide Content in Sensitive and Tolerant Eggplant Callus Cultured Under Salt Stress
(Eugen Ulmer Gmbh Co, 2006) Yasar, F.; Ellialtioglu, S.; Kusvuran, S.
The objective of present study was to determine difference in ion and MDA (malondialdehyde) content of tolerant and sensitive genotypes calli grown under salinity condition. For this purpose, two tolerant and two sensitive local Turkish eggplant varieties were used. After 8 days of being cultured, callus growth of all genotypes showed a decrease in salted medium as compared to control medium. When grown in salted medium, sensitive lines produced less callus, accumulated lower K and Ca but higher Na and Cl than tolerant lines. Consequently, tolerant genotypes had higher K/Na and lower Na/Ca ratios than sensitive genotypes. K/Na and Na/Ca ratios were used as parameters determining salinity tolerance in eggplant. The magnitude of lipid damage, as measured by MDA, was lower in the tolerant genotypes. MDA content of tolerant genotypes was two fold less than those of sensitive genotypes in NaCl treatment medium. MDA content of calli of the four eggplant varieties investigated in this study were also found as a significant indicator determining salt tolerant. The present results demonstrated that the response of cultured calli of eggplant to salt stress was clearly genotype specific.