Figure 4.

Northern-blot analysis of psbA and psaE transcript levels in PAL mutant cells. PAL cells (15 μg Chl m⁻¹) were pre-incubated under low intensities of white light for 15 min (30 μE m⁻² s⁻¹) and then transferred to high-light intensities (1,800 μE m⁻² s⁻¹).