Light-Quality-Adapted Carotenoid Photoprotection in the Photosystem of .

The photosystem of filamentous anoxygenic phototroph (.) comprises a light-harvesting (LH) complex encircling a reaction center (RC), which intensely absorbs blue-green light by carotenoid (Car) and near-infrared light by bacteriochlorophyll (BChl). To explore the influence of light quality (color) on the photosynthetic activity, we compared the pigment compositions and triplet excitation dynamics of the LH-RCs from .