بررسي تنوع ژنتيكي وهمبستگي فنوتيپي صفات مربوط به ريزغده زايي تحت تنش شوري وغير شوري در بعضي از ارقام سيب زميني در شرايط كنترل شده

Some Effects of Seed Aging on Germination Characteristics and Activities of Catalase and Peroxidase Antioxidant Enzymes in Barley Genotypes (Hordeum vulgare)

ln order to study seed aging and its effects on germination characteristics and enzymatic antioxidant activities of barley genotypes. this study was performed at the seed lab of Faculty of Crop and Animal Science, University of Tehran. After harvesting. to evaluate the seed vigor of 20 barley genotypes, an accelerating-aging test in complete randomized design with threereplications was conducted in the laboratory. Such traits as germination %, germination speed as well as germination index were assessed. In a second set of experiments, the activities of antioxidant enzymes, catalaze and peroxidaze were evaluated in seed embryos of two barley genotypes with higher and lower seed vigour. The seed accelerate- aging test showed that aging would reduce a germination percent, speed, as well as index. The genotypes with higher vigour possessed high mean characteristics. Theactivities of antioxidant enzymes, catalaze and peroxidaze, under different hydration treatments tIS well as aging and non-aging tests revealed that the enzyme activity of genotypes with lower vigor was less than that of the genotypes with higher vigor and that accelerated aging would cause reduction intheenzyme activities of these twobarley genotypes. The overall results indicated that catalaze activity would be more affected by seed ageing than peroxidase would.