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

Abstract

Green plastids prepared from seedlings of Pinus silvestris harvested 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 with N-methylphenazonium methosulfate, but could not catalyze the photoreduction of 2,4-dichlorophenol indophenol in the absence and presence of diphenylcarbazide. In dark-grown seedlings of Pinus silvestris, functional photosystem I developed with no exposure to light, but no photosystem II activity was abserved.