Effects of Al and B interactions on ABS/RC (A), TRo/RC (B), ETo/RC (C), REo/RC (D), DIo/RC (E), Sm (ECo/RC, F), φRo(G) and PItot,abs (H) of dark-adapted Citrus grandis leaves. Diagonal cross area quantifies the Al effect under different B supply. Each point is mean of 8 – 10 replicates with standard error. Difference among eight treatments was analyzed by 2 (Al levels) × 4 (B levels) ANOVA. (A) – (C) and (F) – (G) P values for Al, P, and the interaction between the two were all < 0.0001; (D) – (E) P values for Al, P, and the interaction between the two were < 0.0000, < 0.0000 and 0.0001; (H) P values for Al, P, and the interaction between the two were 0.0216, 0.0000 and 0.0002, respectively. Different letters indicate significant differences among eight treatments at P < 0.05.