TY - JOUR
AU1 - Frank, Harry
AU2 - Cua, Agnes
AU3 - Chynwat, Veeradej
AU4 - Young, Andrew
AU5 - Gosztola, David
AU6 - Wasielewski, Michael
AB - Green plants use the xanthophyll cycle to regulate the flow of energy to chlorophylla within photosynthetic proteins. Under conditions of low light intensity violaxanthin, a carotenoid possessing nine conjugated double bonds, functions as an antenna pigment by transferring energy from its lowest excited singlet state to that of chlorophylla within light-harvesting proteins. When the light intensity increases, violaxanthin is biochemically transformed into zeaxanthin, a carotenoid that possesses eleven conjugated double bonds. The results presented here show that extension of the ⧄ conjugation of the polyene lowers the energy of the lowest excited singlet state of the carotenoid below that of chlorophylla. As a consequence zeaxanthin can act as a trap for the excess excitation energy on chlorophylla pigments within the protein, thus regulating the flow of energy within photosynthetic light-harvesting proteins.
TI - Photophysics of the carotenoids associated with the xanthophyll cycle in photosynthesis
JF - Photosynthesis Research
DO - 10.1007/BF02183041
DA - 2004-04-06
UR - https://www.deepdyve.com/lp/springer-journals/photophysics-of-the-carotenoids-associated-with-the-xanthophyll-cycle-yUiNCVgAQd
SP - 389
EP - 395
VL - 41
IS - 3
DP - DeepDyve
ER -