Abstract
It is known that the pool size of xanthophyll cycle pigments increases on light-harvesting complex-II (LHCII) of plants grown under high light conditions. However, little is known about the change of the carotenoid composition of LHCI during the process of adaptation to high intensity light. In the present study, plants and photoautotrophic (PA) cells of tobacco were grown under high light (HL) or low light (LL) conditions, and the pigment composition of LHCI and LHCII were analyzed.
Results indicate that, in leaves, the ratio of xanthophyll cycle pigments in total carotenoids of PSI increased in HL in comparison with that in LL. The number of xanthophyll cycle pigments per LHCI in HL was also higher than in LL. Besides, since the Chla/Chlb ratio was higher in HL compared with LL, we suggested that the proportion of LHCI to reaction center is different between HL and LL.
