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The relationships of root H2O2 and MDA contents with root superoxide dismutase (SOD), catalase (CAT), ascorbic peroxidase (APX), glutathione reductase (GR) activities under cold treatment among eight cultivars. The temperature was set at 15 °C for cold treatment and 27 °C for control. After 4 days of treatment, the temperature was adjusted to 27 °C for 3 days before harvesting
