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A principal component analysis biplot, indicating distinct effects of lighting treatments on ‘Rouxai’ baby-leaf lettuce and correlations between growth, morphological, and biochemical measurements. LL—leaf length; LW—leaf width; FW—fresh weight; DW—dry weight; DPPH—2.2–Diphenyl–1–picrylhydrazyl free radical scavenging activity; TPC—total phenolic content; TAC—total anthocyanin content. See Table S2 for the description of treatments.
