Figure 5.

Effect of exogenous addition of NADH (2 mM) and n-propyl gallate (Pga, 1 mM) on the chlorophyll fluorescence level measured under low light in thylakoid membrane suspensions (50 μg Chl·mL⁻¹) isolated from leaves recently detached (A and B) or incubated in water for 20 h under high light intensity (1400 μmol·m⁻²·s⁻¹) at 24 °C (C and D) from H. rosa-sinensis plants in control conditions and after exposure to three photoperiods (18 h, 60 μmol·m⁻²·s⁻¹ PPFD and 35 °C) with reduced irrigation (water deficit). The stress photoperiods were separated by 6 h night-periods at 24 °C. The figure shows typical curves from five independent replicates.