Saturating white light pulses of 8 000 μmol m–2 s–1
were applied for 0.8 s to ensure for maximum maximal
fluorescence emissions (Fm). Using those same leaves,
the minimal fluorescence (Fo´) and light-adapted maximum
fluorescence (Fm´) were recorded in the morning (9:00 to
11:00, when the light intensity was 1 000–1 200 μmol m–2 s–1).