Plastocyanin as the Possible Site of Photosynthetic Electron Transport Inhibition by Glutaraldehyde | Zendy

Haim Hardt | Zendy; Bessel Kok | Zendy

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Plastocyanin as the Possible Site of Photosynthetic Electron Transport Inhibition by Glutaraldehyde

Author(s) -

Haim Hardt,

Bessel Kok

Publication year - 1977

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.60.2.225

Subject(s) - plastocyanin , p700 , photosystem i , cytochrome b6f complex , glutaraldehyde , photosystem , electron transport chain , chemistry , photochemistry , photosystem ii , dcmu , electron acceptor , cytochrome f , cytochrome , spinach , photosynthetic reaction centre , light harvesting complexes of green plants , chloroplast , photosynthesis , electron transfer , biochemistry , enzyme , organic chemistry , gene

Treatment of spinach chloroplasts with glutaraldehyde causes an inhibition in the electron transport chain between the two photosystems. Measurements of O(2) flash yields, pH exchange, and fluorescence induction show that the O(2) evolving apparatus, photosystem II and its electron acceptor pool are not affected. The behavior of P700 indicates that its reduction but not its oxidation, is severely inhibited. Cytochrome f is still reducible by photosystem II but also slowly oxidizable by photosystem I. The sensitivity of isolated plastocyanin to glutaraldehyde further supports the conclusion that glutaraldehyde inhibits at the plastocyanin level and thereby induces a break between P700 and cytochrome f.

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