EFFECTS OF SALINITY ON ANTIOXIDANT ENZYMES AND PROLINE IN LEAVES OF BARLEY SEEDLINGS IN DIFFERENT GROWTH STAGES
Makaleler > Tam Makale · 2014
Yazarlar: Turkyilmaz Unai, B., Y. Aktas , L., Guven , A.
2534-983X, Uluslararası, 2014
Özet
The participation of antioxidant defence under mild and severe salt stress conditions (120 and 240 mM) on barley (Hordeumvulgare L.) seedlings in different growth stages, antioxidant enzyme (superoxide dismutase, peroxidase and catalase)activities and proline content were determined. Plants grown in Hoagland solution served as control. Salinity induced prolineaccumulation in both 2- and 4-week-old-seedlings (up to 8.7-fold and 1.8 fold, respectively, as compared with control). Theactivities of antioxidant enzymes in leaves increased under NaCl stress, the seedlings in the early growing stage (2-week-old)being generally more responsive than 4-week-old ones. The highest peroxidase (POX) and superoxide dismutase (SOD) activitieswere 165 and 152 % of control, respectively. Catalase (CAT) activity reached about 7- fold increase in NaCl treatment of2-week-old seedlings. This dramatic increase might indicate that CAT is a major enzyme among antioxidant enzymes examinedin barley under salt stress. Thus, antioxidant defence system induced by salinity plays prominent role particularly in earlygrowth periods and its efficiency decrease with age of the plants.