Journal
FEMS MICROBIOLOGY LETTERS
Volume 189, Issue 2, Pages 219-223Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0378-1097(00)00288-3
Keywords
3,5-dihydroxy-4-isopropylstilbene; antibiotic; Photorhabdus; Heterorhabditis; Galleria; symbiosis
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The population of Photorhabdus luminescens C9, bacterial symbiont of the entomopathogenic nematode, Heterorhabditis megidis 90, increased rapidly to 1.2-2.6 x 10(9) cells g(-1) wet Galleria mellonella larvae within 24 h of nematode infection of the larvae, and maintained a relatively constant level (1.2-2.0 x 10(10) cells g(-1)) through the entire 14-day period of nematode development. The antibiotic, 3,5-dihydroxy-4-isopropylstilbene, was produced by P. luminescens C9 after 24 h of nematode infection, increased rapidly at 2-5 days postinfection and remained at a level of 3000-3600 mu g g(-1) wet larvae until about 21 days, decreasing gradually thereafter. The early production and continued presence of a relatively large amount of 3,5-dihydroxy-4-isopropylstilbene in the infected insect supports the hypothesis that the antibiotics produced by the bacterial symbiont help minimize competition from other microorganisms and prevents the putrefaction of the nematode-infected insect cadaver. (C) 2000 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.
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