FRw intensity influences the strength of leaf responses differently between organs. Relative angle change of petiole (A), lamina (B), and petiole–lamina junction (C) and relative length change of petiole (D). Treatments consisted of control (WL) and 4 FRw doses with R:FR 0.1, 0.2, 0.4, and 0.6 (FRw 0.1, FRw 0.2, FRw 0.4, and FRw 0.6), with 140 µmol m⁻² s⁻¹ PAR for all treatments. Measured for 24 h with treatment start time at ZT 2, WL n = 69, FRw R:FR 0.1 n = 22, FRw R:FR 0.2 n = 31, FRw R:FR 0.4 n = 28, and FRw R:FR 0.6 n = 30. Lines represent mean ± Sem. Letters indicate P < 0.05, calculated per every 2 h using 2-way ANOVA and Tukey post hoc test. Shaded areas indicate night without light or FR exposure.