Figure 5.

Enhanced NPQ and retention of ΔL from Lx persists for up to 72 h in the dark in leaf discs in the absence of A+Z. Discs from four leaves on a plant dark adapted overnight were floated on lower epidermis uppermost and exposed to white light-emitting diodes from below (1 h at 220 μmol photons m⁻² s⁻¹) and then allowed to recover on water in the dark. A, Pigment composition of controls (cont) and samples after 48 and 72 h (rec48h and rec72h); samples were collected after RLRC assay. Note that L* has been adjusted by 50 mmol mol⁻¹ chlorophyll, so the scale for L corresponds to 0 to 120 mmol mol⁻¹ chlorophyll. B, Photosynthetic parameters assayed in RLRC on controls and after 48 and 72 h of recovery in the dark. Values shown are means ± se (n = 4); error bars appear whenever se exceeds symbol size.