Regulation of Ribulose Diphosphate Formation in Vivo by Light
- 1 June 1972
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 49 (6), 904-906
- https://doi.org/10.1104/pp.49.6.904
Abstract
Light-dependent formation of ribulose-1,5 diphosphate is completely inhibited by low concentrations of 3-(3,4-dichlorophenyl)-1,1-dimethylurea which do not severely affect cyclic photophosphorylation. Also in Scenedesmus mutant number 11, capable of cyclic photophosphorylation, cellular ribulose-1,5 diphosphate-levels do not increase upon illumination. When mutant cells are H(2) adapted, however, a light-dependent formation of ribulose-1,5 diphosphate is observed in the presence of H(2). From these results it has been concluded that at least part of the Calvin cycle does not operate in the dark, since a reductant is lacking which is generated in the light.Keywords
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