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By excitation of spinach chloroplasts with flashes (5 · 10 -5  sec) of far red light hvI (λ=728 nm) and with addition of 2·10 -4 M/I benzylviologen as electron acceptor irreversible absorption changes are observed as depicted in fig. 1 top. With 10 -3  M/l K 3 Fe (CN) 6  as electron acceptor irreversible changes are observed as depicted in fig. 1 bottom. The difference of the spectra in fig. 1 is presented in fig. 2. Fig. 2 corresponds to the spectrum which is caused by reduction of a cytochrome-b-563. Thus excluding K 3 Fe (CN) 6  as electron acceptor cytochrome-b-563 can be reduced by hvI (λ=728 nm). A re-oxydation occurs by red light hvII (λ = 663 nm), s. figs. 3, 4. These results demonstrate a natural cyclic flow of electrons including both light reactions Chl-ai and Chl-aII (s. fig. 6).

Cytochrom-b-563 als natürlicher Elektronenüberträger in einem zyklischen Elektronentransport der Photosynthese