[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5657/kfas.2003.36.1.024

Growth Inhibition of Diatom, Chaetoceros calcitrans by Marine Bacteria, Shewanella sp. SR-14 - Effects of Marine Bacteria on the Changes of Fatty Acid Composition of Diatoms -

KIM Ji Hoe (National Fisheries Research and Development Institute)
YOON Ho Dong (National Fisheries Research and Development Institute)
PARK Hee Yun (National Fisheries Research and Development Institute)
LEE Hee Jung (National Fisheries Research and Development Institute)
CHANG Dong Suck (Department of Food Science and Technology, Pukyong National University)

Publication Information

Korean Journal of Fisheries and Aquatic Sciences / v.36, no.1, 2003 , pp. 24-29 More about this Journal

Abstract

In the previous reports, the authors isolated two strains of marine bacteria, Shewanella sp. SR-14, which has Chaetonros sp. growth inhibition activity, and Vibrio alginolyticus, that did not affect growth of the alga. In the present study, fatty acid compositions of diatoms, Chaetoceros calcitrans and Skeletonema costatum, and marine bacteria, Shewanella sp. SR-14 and V. alginolyticus, were analyzed. Changes of fatty acid composition in the diatoms grown with the marine bacteria were also determined. Major fatty acids of Sbewanella sp. SR-14 were 16:1n-7 $(29.4\%)$ and 16:0 $(19.2\%)$ during incubation in peptone broth at $20^{\circ}C$ for 3 days. The compositions of V. alginolyticus detected were 16:0 $(23.7\%),$ 16:1n-7 $(27.7\%)$ and 18:1n-7 $(21.0\%).$ C. calcitrans consisted of 16:1n-7 $(33.3\%),$ 16:0 $(27.1\%)$ and 14:0 $(12.1\%).$ S. costatum mainly contained 16:1n-7 $(28.9\%),$ 16:0 $(21.6\%)$ and 20:5 $(19.8\%).$ When halves of cell numbers of C. calcitrans were moribund cells by Shewanella sp. SR-14, the C. calcitrans and S. costatum simultaneously cultured with the bacteria were harvested by filtration with GE/D glass microfibre filter. In the fatty acid composition of both diatoms, saturated fatty acid contents in both diatoms grown with Shewanella sp. SR-14 were decreased, but unsaturated fatty acid contents were increased. The differences were greater in C. calcitrans than those in S. costatum. During the growth of diatoms with V. alginolyticus, C. calcitrans showed increase of saturated fatty acid contents and decrease of unsaturated fatty acid contents; however, S. costatum did not show sharp difference in fatty acid content. In this study, Shewanella sp. SR-14, which showed growth inhibition activity against C. calcitrans, influenced on the changes of fatty acid contents in the diatom. It was suggested that increased unsaturated fatty acid was synergistically activated algal growth inhibition activity of Shewanella sp. SR-14.

Keywords

Shewanella sp.; Vibfio alginolyicus; Algal growth inhibition bacteria; Fatty acid; Diatom; Chaetoceros calcitrans; Skeletonema costatum;

Citations & Related Records

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