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Electron Transport in Chloroplasts

I. A COMBINED REQUIREMENT FOR PLASTOQUINONES A AND C FOR PHOTOREDUCTION OF 2,6-DICHLOROINDOPHENOL

From the ¹ From the Department of Biological Sciences, Purdue University, Lafayette, Indiana 47907

Long term extraction of lyophilized chloroplasts with heptane removes plastoquinones A 45 and C. Hill reaction activity as measured by photoreduction of 2,6-dichloroindophenol is decreased in proportion to the extraction of plastoquinone C, whereas up to 40% of the plastoquinone A can be removed without affecting photoreductase activity. Some restoration of activity may be obtained by adding plastoquinones A and C separately, but maximum restoration is obtained by adding both quinones. Optimum restoration is obtained with 0.1 µmole of plastoquinone A and 0.01 µmole of plastoquinone C per mg of chlorophyll. Plastoquinone B can replace plastoquinone C, but other chloroplast quinones, such as plastoquinone D, -tocopherylquinone, and vitamin K₁ do not help to restore activity.

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