Fig. 7

Effects of exogenous GR24 on H2O2 (A), MDA (B) and RBOH gene expression in cucumber seedling roots (C) and leaves (D) under low light stress. Note: The contents of H₂O₂ and MDA were measured at 7 days after the start of low light stress and/or 10 μM GR24 treatments. The samples used to determine gene expression were taken at 0 h, 12 h, 1 d, 4 d and 7 d after the start of low light stress and/or 10 μM GR24 treatments. Each histogram represents the mean value of three independent experiments, and the vertical bars indicate SEs (n = 3). Different letters indicate significant differences at P < 0.05, according to Duncan’s multiple range tests. Cont, 0 μM GR24 + 500 μmolm^− 2 s^− 1 PPFD; Cont+GR24, 10 μM GR24 + 500 μmolm^− 2 s^− 1 PPFD; LL, 0 μM GR24 + 60 μmolm^− 2 s^− 1 PPFD; LL + GR24, 10 μM GR24 + 60 μmolm^− 2 s^− 1 PPFD. Here, RBOH, respiratory burst oxidase homologue