FIGURE 2.

(A) Fresh weight, (B) chlorophyll index, and (C) PSII quantum efficiency of basil plants grown under LED lights with different R:B ratio in the spectrum (RB_0.5, RB₁, RB₂, RB₃, and RB₄). The data, referring to experiment 5, are presented as mean values ± SE (15 replicate plants). Different letters indicate significant differences at P ≤ 0.05. In (D), whole plant images created using PlantExplorer^TM are included. The greater presence of red pixels indicates lower values of F_q′/F_m′, whereas higher yellow/green areas indicate higher F_q′/F_m′ values, as defined in the integrated legend.