Figure 7.

The interactive effect between light spectra and temperature under two light intensities [150 and 300 μmol m^-2 s^-1 in total photon flux density (TPFD; 400-800 nm)] on quantum yield of photosystem II (Φ_PSII ) (A–D), net CO₂ assimilation rate (P_net ) (E–H), and dark respiration rate (R_d ) (I–L). The two light spectra are denoted based on the percentage of far-red photons (FR; 700-800 nm) in TPFD, i.e., 0 and 20% FR light. The three temperatures were 20, 24, and 28°C. Different letters following the mean ± SE [n = 2; subsamples (4 plants per treatment per replicate study) were averaged before statistical analysis] indicate significance at p< 0.05. NS stands for non-significance.