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21-day-old plants were treated with low temperature (8 °C), 20% (w/v) PEG 6000 and 250 mM NaCl for 3 and 12 h before the mature leaves were harvested. Expression of the CmSOD and ClSOD genes were normalized to those of CmActin and ClActin, and shown relative to the expression of CK at 3 h, respectively
