Inhibition of photosystem II in Chlorogloeopsis fritschii with shikonin acetate

FEBS Letters

Al-Oriquat, G.¹  Sallal, A.-K.J.¹  Nimer, N.A.¹ 

[1] Department of Botany and Microbiology, Faculty of Science, University of Kuwait, Kuwait

关键词: Chlorogloeopsis fritschii;    Photosystem I;    Photosystem II;    Photophosphorylation;    Shikonin acetate;   

DOI  :  10.1016/0014-5793(90)81385-2

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Shikonin acetate extracted from the roots of the desert plant, Arnebia decumbens, was tested for its effect on the photosynthetic electron transport system of C. fritschii. Photosystem (PS) II-Hill reaction with water and diphenylcarbazide (DPC) as electron donors and ferricyanide as electron acceptor was inhibited completely. Shikonin acetate has little effect on 2,6-dichlorophenolindophenol (DCPIP)-Hill reaction and no effect on PSI with durohydroquinone as electron donor. Inhibition of Mehler reaction from water to methylviologen with whole cells was studied using 3-(3,4-dichlorophenyl)-1, 1-dimethyl urea (DCMU) and shikonin acetate. About 70% inhibition of cyclic and non-cyclic photophosphorylation was found with 10⁻⁷ M shikonin acetate. These results suggest that shikonin acetate inhibits photosynthetic electron flow at the plastoquinone pool.

【 授权许可】

Unknown