Figure 7.

Northern-blot analysis of psbA transcript level in wild-type cells under high-light intensities of orange or white light in the absence or presence of PMS. A, Cells were pre-incubated for 30 min in orange light (30 μE m⁻² s⁻¹) and then transferred to 500 μE m⁻² s⁻¹ of orange light. B, Cells were pre-incubated for 15 min in white light (30 μE m⁻² s⁻¹) and then transferred to 1,800 μE m⁻² s⁻¹ of white light. The level of the rnpB RNA remained constant.