title: 9,10-Anthraquinone Reduces the Photosynthetic Efficiency of Oscillatoria perornata and Modifies Cellular Inclusions.
abstract: The natural compound 9,10-anthraquinone was found to inhibit the growth of the musty odor-producing cyanobacterium Oscillatoria perornata at a low concentration (1 µM) in previous laboratory studies. In this study, the mode of action of 9,10-anthraquinone was investigated by observing ultrastructural changes in O. perornata and by monitoring chlorophyll fluorescence as an indicator of photosynthetic efficiency. Results indicate that 9,10-anthraquinone inhibits photosynthetic electron transport, probably at PSII, and thereby affects growth. Moreover, 9,10-anthraquinone treatment caused thylakoid disorganization and reduced the number of ribosomes in O. perornata. The thylakoid disorganization is identical to reported modification in a cyanobacterium treated with simazine, a PSII inhibitor.
authors.forename: K K
authors.initials: KK
authors.lastname: Schrader
authors.forename: F E
authors.initials: FE
authors.lastname: Dayan
authors.forename: S N
authors.initials: SN
authors.lastname: Allen
authors.forename: M Q
authors.initials: MQ
authors.lastname: de Regt
authors.forename: C S
authors.initials: CS
authors.lastname: Tucker
authors.forename: R N
authors.initials: RN
authors.lastname: Paul Jr