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Beta-glucuronidase (GUS) activities in transgenic tobacco leaves under cold stress. FaG6PDHpro-C:: GUS and FaG6PDHpro-D:: GUS seedlings were kept at 4 °C and 25 °C for 48 h. Round leaf discs with a diameter of 1 cm punched from the treated tobacco leaves were performed histochemical staining (A) and quantification analysis (B) of GUS protein expression. Different lowercase letters indicate significant differences at p < 0.05.
