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Quantitative analysis of GUS and LUC activities under PEG-6000 treatment. a GUS activity. b LUC activity. The tobacco leaves were incubated in the liquid 1/2 MS medium supplemented with 20% (w/v) PEG-6000 for 2 and 4 h. The leaves incubated in the liquid 1/2MS medium were used as control. Values represent the mean ± standard deviation among replicates. *P < 0.05, **P < 0.01
