Bulunan: 3 Adet 0.001 sn
Konu Başlıkları Antioxidant enzymes
167329

Responses of antioxidant defense system of Helianthus annuus to abscisic acid treatment under drought and waterlogging.

Yüksel Keleş, Serpil Ünyayar

The effect of abscisic acid (ABA) treatment on growth pigments and antioxidant defense system were in vestigated in seedlings of Helianthus annuus (cvs. Nantio F1 and Özde mirbey) subjected to drought and waterlogging stress. In addition, seedlings were sprayed with 10 µM ABA three times every other day. Reltive growth rate (RGR) was significantly reduced in both genotypes under drought stress, however, this growth inhibition was less in ABA-treated plants. Total chlorophyll content increased by drought stress in both gentypes. Ascorbate was not influenced by drought, while α-tocopherol in creased in cv. Nantio F1. Ascorbate and α-tocopherol in creased with drought stress in cv. Özdemirbey. ABA treat ment de creased ascorbate and ß-carotene contents while it increased α-tocopherol and xan...

167480

Effects of dietary selenium of organic form against lead toxicity on the antioxidant system in Cyprinus carpio

YILMAZ, FERBAL ÖZKAN | HUNT, ARZU ÖZLÜER | YALIN, SERAP

In this study was evaluated potential protective effect of organic selenium (Se) on heavy metal stress induced by lead (Pb) in Cyprinus carpio. For this reason, C. carpio was exposed to sublethal concentration of Pb (1.5 mg/L Pb(NO3)2) for 14 days. The fish were fed a basal (control; measured 0.55 mg/kg Se) diet or a basal diet supplemented with 2.50 mg/kg (measured 2.92 mg/kg Se) organic Se (Sel-Plex®) during the experiment period. The variations in glutathione peroxidase (GSH-Px), glutathione S-transferase (GST) activities, and levels of reduced glutathione (GSH) with malondialdehyde (MDA) in liver and brain tissues of C. carpio were investigated in experimental groups. GSH levels in liver and brain tissues were significantly decreased by exposure to Pb. GST activity was significantly in...

167484

Effect of Mannan Oligosaccharide on Growth Body Composition and Antioxidant Enzyme Activity of Tilapia Oreochromis niloticus

HUNT, ARZU ÖZLÜER | YILMAZ, FERBAL ÖZKAN | YALIN, SERAP

The effects of three inclusion levels of mannan oligosaccharides (MOS) derived from the outer cell wall of a select strain of Saccharomyces cerevisiae (Bio-Mos, Alltech Inc, USA) on growth, feed utilization, body composition, and antioxidant enzyme activity of tilapia (Oreochromis niloticus) were determined. Specimens (12 g) were fed a commercial diet supplemented with 0‰, 2.5‰, 3.5‰, or 4.5‰ dietary MOS for 60 days. Food conversion rates (FCR), specific growth rates (SGR), and the biochemical composition of muscle tissue were determined. Growth was greatest, protein was highest, and lipid was lowest in fish fed the 2.5‰ MOS diet. The FCR was significantly better in all MOS-treated groups than in the unsupplemented control. At the end of the study, antioxidant enzyme activity of superoxid...