Fig. 5.

Light response curves of ETR (A), qP (B) and NPQ (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 = 4) 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.