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Title:   Author  item
                                            Schrader, Kevinitem
                                            Dayan, Franckitem
                                            Allen, Stacyitem
                                            DE REGT, MARJAN - DREC,MS STATE UNIVERSITYitem
                                            TUCKER, CRAIG - DREC,MS STATE UNIVERSITYitem
                                            Paul Jr, Rex
  Submitted to: International Journal of Plant Science
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 2/8/2000
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary: Previous laboratory studies have found that a natural compound known as anthraquinone kills the blue-green algae (cyanobacteria) that produce musty odors that cause musty flavor in catfish raised in the Mississippi Delta. In this study, the method by which anthraquinone kills these undesirable blue-green algae was studied.  Results found that anthraquinone stops  photosynthesis in the blue-green algae tested and also causes changes in the cell structure to prevent growth of the blue-green algae.
                                Technical 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 um) 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.


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