Fig. 6. A diagram of different types of chromatic acclimation (CA) in cyanobacteria; here, the nature of changes in light-harvesting structures are specified for each type of CA; the phycobilisomes (PBS) are shown attached to the thylakoid membrane, in which the photosystems are demarked by two vertical lines. For simplicity, the positions of the PBS are illustrated in the same manner in almost all cases, and the CA changes are shown in color. The three major types of CA are: (A) green/red acclimation, including the CA1, CA2, or the CA3 type; (B) blue/green acclimation CA4; and (C) red/far-red acclimation, including CA5 or CA6 type (also called FaRLiP). In the first row are shown CA changes in the PBS induced under green light (for A), blue light (for B), and red light (for C), while in the second row are shown changes under red light (for A), green light (for B), and far-red light (for C). APC – allophycocyanin; PC – phycocyanin; PCB – phycocyanobilin; PE – phycoerythrin; PEB – phycoerythrobilin; PUB – phycourobilin. See the text for further details. Modified from Sanfilippo et al. (2019).