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Induction of PR1a-GUS gene expression by PAs. GUS activity in the leaf discs of PR1a-GUS transgenic tobacco plants was determined 3 d after the treatment with various PAs. For a positive control, leaf discs were treated with 50 μm SA (pH 7.0). Data are the mean values of triplicate samples. Error bars indicate sd. The experiment was repeated twice with similar results. FW, Fresh weight.
