OsNAP -overexpressing transgenic lines showed enhanced tolerance to MeJA treatment. A, Seeds of WT and OsNAP-overexpressing plants were germinated at 22°C on 1/2 MS medium and then transferred to 1/2 MS medium with and without 25 μM MeJA. The photograph was taken on day 10 after inoculation. The experiment was repeated three times. B and C, Shoot and root lengths of the lines grown on MeJA-containing (B) or normal (C) medium. The shoot and root lengths were counted after growth for 10 d. Error bars indicate SD (n = 10). *P < 0.05 (t test).