Zur Rolle des Plastochinons bei der Photosynthese

Abstract
Photosynthetic reactions of petrolether-extracted chloroplasts were investigated. The photosynthetic reduction of NADP by plastoquinone-free chloroplasts can be reactivated by addition of dimethylsubstituted p-benzoquinones with a side-chain of at least one isoprene unit. Broken chloroplasts. from which plastoquinone has been only partly extracted, are able to reduce NADP and p-benzoquinones, but not ferricyanide, o-quinones, vitamin K3 and anthraquinone-sulfonate. The interpretation of these results as two functions of plastoquinone in photosynthetic electron transport is critically discussed.

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