Abstract
Summary Cells of a mutant of Scenedesmus , lacking the light harvesting system of the photosynthetic apparatus (WT-LHC 1 ), were adapted to high or low intensities of white light. Phenotypically they demonstrated the same adaptational behavior, expressed by the photosynthetic light intensity curves, as sun and shade plants. But changes in the molecular structure were different. Under low light intensity the number of PS I and PS II reaction centers with their core antennae increased in a stoichiometric fashion. Efficiency measurements of PS II and PS I reactions indicate that some of the reaction centers are not coupled to the electron transport chain in low light intensity adapted cells. A loss in quantum efficiency due to a disorder in energy transfer in PS II is discussed and thought to be connected with a dihydroxy/trihydroxy-cacarotene (lutein/loroxanthin) cycle.
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