Figure 13.

Impact of sudden transfer from low light (10 µmol photons m⁻² s⁻¹) to high light (1200 µmol photons m⁻² s⁻¹; open bar across top) for 24 h followed by return to low light (black bar across top) on leaves of Schefflera arboricola that developed in either low light (dark circles) or in high light in a greenhouse where leaves received a peak photon flux density of 1200 µmol photons m⁻² s⁻¹ (open circles). (A) Percent of xanthophyll cycle converted to zeaxanthin + antheraxanthin and (B) percentage of absorbed photons allocated to photochemistry (quantified from chlorophyll fluorescence as photosystem II efficiency). V = violaxanthin. Data are from Demmig-Adams et al. [73].