The effects of salinity on the growth, chemical composition and superoxide dismutase (SOD) and peroxidase (POX) activities of 2 malting barley (Hordeum vulgare L.) cultivars (Kaya and Scarlet) were studied. In 10-day-old seedlings, salinity stress was initiated by applying an appropriate amount of NaCl to water, and it lasted for 30 days. | Turk J Biol 29 (2005) 117-123 © TÜB‹TAK Effect of Salinity on Growth Chemical Composition and Antioxidative Enzyme Activity of Two Malting Barley (Hordeum vulgare L.) Cultivars Mehmet Ali DEM‹RAL, Mehmet AYDIN, Alper YORULMAZ Adnan Menderes University, Department of Soil Science, Faculty of Agriculture, 09100 Ayd›n - TURKEY Received: Abstract: The effects of salinity on the growth, chemical composition and superoxide dismutase (SOD) and peroxidase (POX) activities of 2 malting barley (Hordeum vulgare L.) cultivars (Kaya and Scarlet) were studied. In 10-day-old seedlings, salinity stress was initiated by applying an appropriate amount of NaCl to water, and it lasted for 30 days. Salinity decreased growth of the + cultivars significantly. Scarlet restricted entry of Na and Cl into root and translocation to leaves more efficiently than did Kaya. As a whole Scarlet produced a higher amount total chlorophyll under salinity than did Kaya. POX activity of the cultivars decreased with salinity up to 20 dS m-1, and then increased. In contrast to POX, salinity increased the SOD activity of leaves. Compared to the control -1 application, and increases were determined in SOD activity, in 10 dS m salinity, for Kaya and Scarlet, respectively. Key Words: Hordeum vulgare L., superoxide dismutase, peroxidase, salinity stress, chemical content, growth Tuzlulu¤un ‹ki Maltl›k Arpa (Hordeum vulgare L.) Çeflidinde Geliflim Kimyasal Bileflim ve Antioksidatif Enzim Aktivitesi Üzerine Etkisi Özet: Tuzlulu¤un iki farkl› arpa (Hordeum vulgare L.) çeflidinde (Kaya ve Scarlet) geliflim, kimyasal içerik, süperokside dismutase (SOD) ve peroksidase (POX) aktiviteleri üzerine olan etkileri araflt›r›ld›. Tuz stresi, fidelerin 10 günlük oldu¤u dönemde uygun miktarlarda NaCl kar›flt›r›lm›fl su verilmesiyle bafllat›ld›. Tuz uygulamas› çeflitlerin geliflimlerini önemli ölçüde geriletti. Scarlet çeflidi + Kaya çeflidine göre Na ve Cl elementlerinin köke giriflini ve .
