Photosynthetic traits and biochemical responses in strawberry (Fragaria × ananassa Duch.) leaves supplemented with LED lights

Selected light wavebands promote plant development and/or the biosynthesis of targeted metabolites. This work offers new insights on effects red (R), green (G), blue (B), and white (W - R:G:B; 1:1:1) LED supplementation physiochemical traits strawberry leaves. Gas exchange chlorophyll fluorescence parameters, photosynthetic pigments, superoxide anion (*O2-) content were analysed in plants grown for 1 (T1) 17 (T17) d with supplementations. At T1, supplementations resulted enhancement de-epoxidation state xanthophylls nonphotochemical quenching, but no changes observed maximal rate (PNmax), irrespective spectra. T17, xanthophyll contents remained higher only R-supplemented plants. Overall, W photosynthesis, whilst R B depressed PNmax values promoted *O2- formation at T17. G did not induce variations nor induced oxidative stress both T1