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Applied and Environmental Microbiology, October 2007, p. 6284-6288, Vol. 73, No. 19
0099-2240/07/$08.00+0     doi:10.1128/AEM.00578-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Effect of Biofilm Formation by Pseudoalteromonas spongiae on Induction of Larval Settlement of the Polychaete Hydroides elegans{triangledown}

Yi-Li Huang, Sergey Dobretsov, Hairong Xiong, and Pei-Yuan Qian*

Coastal Marine Laboratory/Department of Biology, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

Received 13 March 2007/ Accepted 30 July 2007

The effects of culture conditions and chloramphenicol treatment on the induction of the marine bacterium Pseudoalteromonas spongiae to larval settlement of Hydroides elegans were investigated. The results showed that P. spongiae cells grown in the medium containing both yeast extract and peptone (YP-grown P. spongiae) was highly inductive to larval settlement, whereas P. spongiae cells grown in the medium containing only peptone (P-grown P. spongiae) or YP-grown P. spongiae cells treated with chloramphenicol at the onset of biofilm development (YPC-grown P. spongiae) did not induce larval settlement. Analysis of biofilm formation, biofilm structure, and the surface protein profile indicated that only the induction-capable YP-grown P. spongiae formed a well-developed biofilm, while the P-grown P. spongiae and the YPC-grown P. spongiae did not. We report here for the first time that bacterial biofilm formation was associated with its induction of larval settlement.

* Corresponding author. Mailing address: Coastal Marine Laboratory/Department of Biology, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China. Phone: (852) 23587331. Fax: (852) 23581559. E-mail: boqianpy{at}ust.hk

{triangledown} Published ahead of print on 17 August 2007.

Applied and Environmental Microbiology, October 2007, p. 6284-6288, Vol. 73, No. 19
0099-2240/07/$08.00+0     doi:10.1128/AEM.00578-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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