The site of inhibition of photosystem II by 3-(3,4-dichlorophenyl)-N-N'-dimethylurea in thylakoids of the cyanobacterium Anabaena cylindrica. |
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Authors: | G A Codd J D Cossar |
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Institution: | Department of Biological Sciences, University of Dundee, Dundee DD1 4HN, U.K. |
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Abstract: | Thylakoids isolated from the cyanobacterium exhibit Photosystem II activity. Photosynthetic electron transfer from water to ferricyanide and to 2,6-dichlorophenolindophenol is inhibited by 3-(3,4-dichlorophenyl)-N-N′-dimethyl urea. Diphenylcarbazide stimulates ferricyanide and 2,6-dichlorphenolindophenol photoreduction, whilst inhibiting oxygen evolution. Diphenylcarbazide-supported Photosystem II activity is completely insensitive to 3-(3,4-dichlorophenyl)-N-N′-dimethyl urea, indicating that the site of action of this inhibitor lies on the donor side of Photosystem II in , before the site of electron donation by diphenylcarbazide. |
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Keywords: | DCMU 3-(3 4-dichlorophenyl)-N-N′-dimethyl urea DCPIP 2-6-dichlorophenolindophenol |
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