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Science 6 October 1989:
Vol. 246. no. 4926, pp. 116 - 118
DOI: 10.1126/science.2781297
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Articles

Science, Vol 246, Issue 4926, 116-118
Copyright © 1989 by American Association for the Advancement of Science

articles

Symbiotic marine bacteria chemically defend crustacean embryos from a pathogenic fungus

MS Gil-Turnes, ME Hay, and W Fenical

Scripps Institution of Oceanography, University of California, San Diego, La Jolla 92093-0228.

Embryos of the shrimp Palaemon macrodactylus are remarkably resistant to infection by the fungus Lagenidium callinectes, a recognized pathogen of many crustaceans. An Alteromonas sp. bacterial strain consistently isolated from the surface of the embryos, produces 2,3-indolinedione (isatin), a compound that inhibits the pathogenic fungus. If exposed to the fungus, bacteria-free embryos quickly die, whereas similar embryos reinoculated with the bacteria or treated only with 2,3-indolinedione live well. The commensal Alteromonas sp. bacteria protect shrimp embryos from fungal infection by producing and liberating the antifungal metabolite 2,3-indolinedione.


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