Abstract
Quorum sensing (QS) signals have been considered to play important roles in biofilm development and in the attractiveness of biofilms to higher organisms in marine ecosystem. In this study, bacterial QS signalsacylated homoserine lactone derivatives (AHLs) were detected in 2-, 4-, and 6-day-old subtidal biofilms by using AHLs reporter strains. N-dodecanoyl-homoserine lactone (C12-HSL) was identified in 6-day-old biofilm at a concentration of 9.04 μg cm−minus;2 (3.36 mmol l−minus;1). To investigate the possible role of AHLs in the consequent eventlarval settlement of the polychaete Hydroides elegans onto subtidal biofilmsseven biofilm-derived bacteria that effectively induced larval settlement of H. elegans, were screened for AHL production. One of them, the Vibrio sp. UST950701-007, produced N-hexanoyl-homoserine lactone (C6-HSL). Larval settlement bioassay showed that C6-HSL, C12-HSL, and 3-oxo-octanoyl-homoserine lactone (3-oxo-C8-HLS) at certain concentrations induced some initial larval settlement behaviors such as reducing swimming speed, crawling on the bottom. However, these AHLs did not effectively induce larval settlement in comparison to the effective settlement inducer 3-isobutyl-1-methylxanthine. The possible chemokinetic mechanism and indirect effects of AHLs on larval settlement are suggested.
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Acknowledgment
The authors thank Professor Robert McLean (Department of Biology, Texas State University) for his kind gift of the AHLs reporter strains. We also thank Dr. On On Lee, Dr. Vengatesen Thiyagarajan, Dr. Hans-U. Dahms, Dr. Xiancui Li and Prof. Jan Pechenik for their valuable comments on this manuscript, and Mr. Oi Shing Hung for his assistance in larval bioassay. This study was supported by an RGC grants (CA04/05.Sc01, HKUST6402/05M) and a Croucher Foundation Research grant (CF-CAS03/04.Sc01) to Pei-Yuan Qian.
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Huang, YL., Dobretsov, S., Ki, JS. et al. Presence of Acyl-Homoserine Lactone in Subtidal Biofilm and the Implication in Larval Behavioral Response in the Polychaete Hydroides elegans . Microb Ecol 54, 384–392 (2007). https://doi.org/10.1007/s00248-007-9210-9
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DOI: https://doi.org/10.1007/s00248-007-9210-9