Abstract
This study was undertaken to understand peach flowers response to frost damage and the relationship between frost damage and antioxidant enzyme activity in order to develop a criterion for the selecting the frost-resistant cultivars. For this purpose, antioxidant enzymes (catalase, peroxidase, and superoxide dismutase), and polyphenol oxidase activities, frost sensitivity index expressed as injured ovaries percent, and ECr (Relative electrical conductivity) of flowers at full bloom stage (F' Fleckinger) of two peach cultivars ('Takdaneh', and 'Sephid-Ghermez') exposed to freezing temperatures (-1.5, -2.5 and -3.5°C) were determined. The activities of antioxidant enzymes, such as catalase, superoxide dismutase, and peroxidase in 'Sephid-Ghermez' were increased or remained unchanged as temperature decreased. While for 'Takdaneh', the mentioned enzymes lost their activities from -2.5 to -3.5°C. Results suggested that the frost tolerance of the cultivar with lower injured ovaries is associated with lesser ion leakage, catalase, peroxidase, superoxide dismutase activity, and polyphenol oxidase activity. The different responses of enzymes may be one of the possible mechanisms of the differences in frost-sensitivities of the two peach cultivars.
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