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INHIBITION OF ELECTRON TRANSPORT IN CHLOROPLASTS BY CHAOTROPIC AGENTS AND THE USE OF MANGANESE AS AN ELECTRON DONOR TO PHOTOSYSTEM II *
Author(s) -
LOZIER R.,
BAGINSKY M.,
BUTLER W. L.
Publication year - 1971
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1971.tb06176.x
Subject(s) - photosystem ii , chaotropic agent , chloroplast , photosystem i , chemistry , electron transport chain , photochemistry , dcmu , p700 , photosynthesis , hill reaction , tris , manganese , biochemistry , organic chemistry , gene
— Incubating spinach chloroplasts with various chaotropic agents results in inhibition of photosynthetic electron transport between water and Photosystem II similar to the inhibition caused by washing chloroplasts with a high concentration of Tris buffer. Partial restoration of NADP photoreduction and fluorescence of variable yield is achieved by adding hydroquinone or Mn 2+ , either of which donates electrons to Photosystem II in the inhibited chloroplasts. The inhibitory treatments cause the release of Mn from its bound state in the chloroplast, thus allowing the measurement of the ESR signal of Mn 2+ . The ESR measurement is used to follow the photooxidation of Mn 2+ as it donates electrons to photosystem II.