Quorum Sensing Signal Molecule and Biofilm-forming Capacity in Coastal Bacteria

In this study,the correlation between quorum sensing and biofilm forming of 43 marine bacterial strains was evaluated by quantitatively detecting the activity of acyl-homoserine lactones(AHLs) and AI-2 signals,as well as the biofilm formation in the 43 bacterial strains.The results revealed that 9 of the 10(90%) AHL activity strains displayed definite biofilm-forming capacity,7 of these 10 strains exhibited highly structured architecture in biofilm.67% of AI-2 activity strains have strong biofilm-forming capacity.The results also indicated that the strains with AHL activity usually presented strong biofilm-forming capacity.However,other bacteria which cannot produce quorum sensing signal still exhibit strong biofilm-forming capacity.Therefore,it could be indicated that for environmental bacteria,the existing of quorum sensing signal molecule(especially the AHL) in bacterial strains,usually tends to be a sufficient condition other than a necessary one for forming biofilms