Effects of signaling molecules on OsAP77::GUS expression. (A) 10 mM SA; (B) 5 mM INA; (C) 20 mM H2O2; (D) ABA. The GUS activity was analyzed in the leaves of T3 plant treated with indicated duration (days) after each treatment. Rice seedlings at 4-leaf stage, seedlings root were dipped in 3 ml of different solutions and kept at 28°C. The 4th young leaves were cut into 1 cm pieces and used for GUS staining. The GUS activity was analyzed in the leaves treated with indicated duration (d, days) after each treatment.