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N -Acyl homoserine lactone (AHL) serves as signaling molecule for quorum sensing (QS) in Gram-negative bacteria to regulate various physiological activities including pathogenicity. With the aim of isolating freshwater-borne bacteria that can cause outbreak of disease in plants and portrayed QS properties, environmental water sampling was conducted. Here we report the preliminary screening of AHL production using  Chromobacterium violaceum  CV026 and  Escherichia coli  [pSB401] as AHL biosensors. The 16S rDNA gene sequence of isolate M009 showed the highest sequence similarity to  Pantoea stewartii  S9-116, which is a plant pathogen. The isolated  Pantoea  sp. was confirmed to produce  N -3-oxohexanoyl-L-HSL (3-oxo-C6-HSL) through analysis of high resolution mass tandem mass spectrometry.

Pantoeasp. Isolated from Tropical Fresh Water ExhibitingN-Acyl Homoserine Lactone Production