Inhibition of pathogenic Vibrio by the microalgae Isochrysis galbana |
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Authors: | Ceres A Molina-Cárdenas M del Pilar Sánchez-Saavedra Marcial L Lizárraga-Partida |
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Institution: | 1. Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Carretera Tijuana-Ensenada 3918, Zona Playitas, 22860, Ensenada, Baja California, México
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Abstract: | Vibrio alginolyticus, Vibrio campbellii, and Vibrio harveyi were inhibited by Isochrysis galbana in batch cultures. I. galbana reduced the V. alginolyticus, V. campbellii, and V. harveyi counts to undetectable levels in 2, 4, and 7 days (<0.01 Vibrio spp. mL?1), respectively, remaining so until the end of the experiment on day 15. Other heterotrophic bacteria reached counts of 106 CFU mL?1 on ZoBell medium at the end of the experiment. Vibrio parahaemolyticus was not inhibited by I. galbana. In all mixed I. galbana and Vibrio spp. cultures, the algal density increased from 3.5 to 4.0?×?107 cells mL?1, higher than that in I. galbana cultures alone, indicating a lack of an inhibitory effect on microalgae in the mixed cultures. The predominant fatty acids (>82 %) of I. galbana during the stationary growth phase were estearidonic (24.3 %), oleic (15.7 %), myristic (13.8 %), docosahexaenoic (11.0 %), palmitic (10.3 %), and α-linolenic (7.2 %) acids. These results demonstrate that I. galbana synthesizes antibacterial fatty acids that inhibit the growth of pathogenic bacteria such as V. alginolyticus, V. campbellii, and V. harveyi. |
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