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The pathogenic symptoms, trypan blue, and diaminobenzidine (DAB) staining of tobacco leaves infected with powdery mildew. The pathogenic symptoms of transgenic tobacco (L5) and wild type (WT) at 7 and 28 day post inoculation (A); trypan blue staining was performed to visualize cell death (B); DAB staining was performed to visualize hydrogen peroxide (H2O2) accumulation (C). Scale bars = 200 μm.
