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Bacterium-dinoflagellate interactions: investigative microscopy of Alexandrium spp. (Gonyaulacales, Dinophyceae)

Lewis, Jane and Kennaway, Gabrielle and Franca, Susana and Alverca, Elsa (2001) Bacterium-dinoflagellate interactions: investigative microscopy of Alexandrium spp. (Gonyaulacales, Dinophyceae). Phycologia, 40 (3). pp. 280-285. ISSN 0031-8884

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The association of bacteria with dinoflagellates has been a neglected field of study, which has gained prominence in recent years because of the possible role of bacteria in toxin synthesis. A number of dinoflagellates undergo sexual reproduction, passing through various life-cycle stages in addition to the vegetative form. The presence of bacteria within dinoflagellates has been well established, but their presence throughout the dinoflagellate life-cycle has not been investigated. Using cultures of Alexandrium (A. tamarense, A. fundyense), we investigated the association of bacteria with various vegetative growth phases (lag, log, stationary) and sexual life-cycle stages (planozygote, planomeiocyte, hypnozygote), using scanning electron microscopy, transmission electron microscopy (TEM) and epifluorescence microscopy. Bacteria were found to be associated with the surfaces of vegetative cells, planozygotes, hypnozygotes and planomeiocytes. TEM showed bacteria to be present within all vegetative growth phases, as well as in the sexual planozygote, cyst and planomeiocyte. The presence of intracellular bacteria in vegetative cells was also confirmed using DAPI staining combined with epifluorescence microscopy, and lipopolysaccharide staining combined with TEM. Copyright © (2001) International Phycological Society. Reprinted by permission of Alliance Communications Group, a division of Allen Press, Inc.

Item Type:Article
Research Community:University of Westminster > Life Sciences, School of
ID Code:304
Deposited On:01 Dec 2005
Last Modified:21 Dec 2009 16:55

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