Submitted to: International Journal of Plant Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/8/2000
Publication Date: N/A
Interpretive 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.