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Light response curves of photosynthetic O2 evolution (A), PS II concentration (B) and Cyt b6f concentration (C) measured from the youngest fully expanded leaves of I. batatas grown under different light conditions. Means with different letters are statistically different (P < 0.05; n = 3) as determined by LSD multiple comparison test. SL, Sunlight; SL + L-LED, SL with supplemental LED at a PPFD of 150 μmol m−2 s−1; SL + H-LED, SL with supplemental LED at a PPFD of 300 μmol m−2 s−1.
