Photosystem I-dependent oxidation of organic acids in blue-green alga, Anabaena variabilis

Photosynthetic lamellar fragments isolated from photoautotrophically grown cells of Anabaena variabilis were tested for their methyl viologen photoreduction activity by coupled oxygen uptake in the presence of CMU. Four kinds of organic acids, glycolate, malate, succinate and isocitrate, were found...

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Bibliographic Details
Published in:Plant and cell physiology 1975-10, Vol.16 (5), p.789-797
Main Authors: Murai, T, Katoh, T. (Kyoto Univ. (Japan). Faculty of Science)
Format: Article
Language:English
Subjects:
plant biochemistry
plant physiology
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Summary:Photosynthetic lamellar fragments isolated from photoautotrophically grown cells of Anabaena variabilis were tested for their methyl viologen photoreduction activity by coupled oxygen uptake in the presence of CMU. Four kinds of organic acids, glycolate, malate, succinate and isocitrate, were found to serve as electron donors of photosystem I, bypassing photosystem II, as in the case of reduced DCPIP. Spectrophotometric measurement revealed that the dark reduction of photooxidized cytochrome f and P700 was markedly accelerated if one of the four organic acids was present.
ISSN:0032-0781
1471-9053
1471-9053
DOI:10.1093/oxfordjournals.pcp.a075200