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Representative lettuce roots grown under two light intensities x three temperatures x two light spectra. The two light intensities were total photon flux densities (TPFDs; 400 to 800 nm) of 150 and 300 μmol m-2 s-1. The three temperatures were 20, 24, and 28°C. 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.
