[Fotovosstanovlenie feofitina v reaktsionnykh tsentrakh fotosistemy II tselykh kletok zelenykh vodorosleǐ i tsianobakteriǐ v anaérobnykh usloviiakh]

Translated title of the contribution: [Photoreduction of pheophytin in reaction centers of the photosystem II in intact cells of green algae and cyanobacteria under anaerobic conditions].

S. I. Allakhverdiev, V. V. Klimov, V. G. Ladygin

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Reversible photoreduction of pheophytin (Pheo) accompanied by a decrease in the chlorophyll fluorescence yield is observed in Photosystem 2 of the intact cells of green algae and cyanobacteria under anaerobic conditions. The photoreaction is inhibited by DCMU and reactivated upon subsequent addition of either ascorbate of dithionite. It is suggested that as a result of electron donation from the water splitting system being in the state S(3), to the reaction centre of Photosystem 2 in the state [P(+)(680)Pheo(-)] Q(-) after the primary photoreaction there occurs formation of the long-living state [P(680)Pheo(-)] Q(-). It was found that oxidized NADP, benzyl viologen and methyl viologen accelerate oxidation of Pheo reduced int he Photosystem 2 in the light indicating that these electron acceptors (typical for Photosystem 1) can accept an election from Pheo in Photosystem 2.

Translated title of the contribution[Photoreduction of pheophytin in reaction centers of the photosystem II in intact cells of green algae and cyanobacteria under anaerobic conditions].
Original languageRussian
Pages (from-to)442-447
Number of pages6
JournalBiofizika
Volume33
Issue number3
Publication statusPublished - May 1 1988

ASJC Scopus subject areas

  • Medicine(all)

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