Changes in oxidative damage and antioxidant enzyme activities of barley (Hordeum vulgare L.) cultivars exposed to rewarming upon freezing stress / Donma stresi üzerine yeniden sıcaklık artışına maruz kalmış arpa (Hordeum vulgare L.) çeşitlerinin antioksidan enzim aktivitelerinde ve oksidatif zararında değişimler

Abstract

Objective: The growth of plants during recovery period after freezing stress is more important for winter cereals to survive frost. However, little research has been done on physio-biochemical changes in response to recovery or rewarming conditions in cereals. In this study, the changes in oxidative stress intensities and antioxidant enzyme activities were thus examined under cold acclimation (CA), short-term freezing stress (F) and rewarming (R) conditions in barley cultivars differing in cold tolerance in order to assess the changes in Reactive Oxygen Species (ROS) scavenging system.Methods: Electrolyte leakage, Fv/Fm ratio (quantum efficiency of PSII), the contents of hydrogen peroxide (HResults: A corresponding increase in the free proline content and activities of APX and GR, the levels of Fv/Fm ratio, electrolyte leakage and the contents of MDA and HConclusion: Lower amount of H