Shikonin isovalerate: An inhibitor of photosystem II in Chlorogloeopsis fritschi |
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Authors: | A -K J Sallal N A Nimer |
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Institution: | (1) Department of Botany and Microbiology, Faculty of Science, Kuwait University, Kuwait |
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Abstract: | Shikonin isovalerate, extracted from the roots of the desert plant Arnebia decumbens, was tested for its effect on photosynthetic electron transport system of Chlorogloeopsis fritschii. The ferricyanide-Hill reaction with water and DPC as electron donors was inhibited completely with 10-5 M shikonin isovalerate. The photoreduction of DCPIP through photosystem II was only slightly inhibited. Photosystem I from durohydroquinone to methyl viologen was not affected using 10-6 M shikonin isovalerate. The same concentration caused 49% inhibition of cyclic photophosphorylation. These results suggest that shikonin isovalerate inhibits photosynthetic electron flow at the plastoquinone pool.Abbreviations DCMU
3-(3,4-dichlorophenyl)-N,N-dimethyl urea
- DBMIB
2,5-dibromo-3-methyl-6-isopropyl-P-benzoquinone
- DCPIP
2–6-dichlorophenolindophenol
- DPC
Diphenylcarbazide
- Tricine
N-2-hydroxy-1,1-bis(hydroxymethyl)ethyl]glycine |
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Keywords: | Chlorogloeopsis fritschii Photosystem II Photosystem I Shikonin isovalerate |
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