Functional development of photosystems I and II in dark-grown pine seedlings

摘要

Green plastids prepared from seedlings ofPinus silvestrisharvested after three weeks of growth in the dark, without exposure to light, catalyzed photoreductions of methyl viologen and nicotinamide-adenine dinucleotide phosphate, and cyclic photophosphory-lation withN-methylphenazonium methosulfate, but could not catalyze the photoreduction of 2,4-dichlorophenol indophenol in the absence and presence of diphenylcarbazide. In dark-grown seedlings ofPinus silvestris, functional photosystem I developed with no exposure to light, but no photosystem II activity was abserved.