Abstract
The effects of electron acceptors, inhibitors of electron flow and uncouplers and inhibitors of photophosphorylation on a state II to I transition were studied. 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) did not inhibit the state II to I transition. By contrast, 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB), methyl viologen and antimycin A inhibited the transition indicating that the cyclic electron flow around photosystem I, but not the oxidation of electron carriers (such as plastoquinone), induced the state II to I transition. Uncouplers, but not inhibitors of photophosphorylation, inhibited the state transition suggesting that the proton transport through the cyclic electron flow was related to the transition.
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Abbreviations
- DCMU:
-
3-(3,4-dichlorophenyl)-1,1-dimethylurea
- DBMIB:
-
2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone
- CCCP:
-
carbonylcyanide m-chlorophenylhydrazone
- DCCD:
-
N,N′-dicyclohexylcarbodiimide
- PMS:
-
N-methylphenazonium methosulfate
- LHCP:
-
light-harvesting chlorophyll a/b proteins
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CIW-DPB Publication No. 790
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Satoh, K., Fork, D.C. The relationship between state II to state I transitions and cyclic electron flow around photosystem I. Photosynth Res 4, 245–256 (1983). https://doi.org/10.1007/BF00052128
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DOI: https://doi.org/10.1007/BF00052128