Table 2.

Production of N-acyl-homoserine lactones by four newly sequenced strains of the Sphingomonas, Sphingobium and Novosphingobium group assayed by five AHL-dependent biosensor strains^*.

Genus and species/strain	AhyR‡	LuxR‡	TraR‡	LasR‡	CviR#
Sphingomonas paucimobilis EPA505	−	−	+++	+	+++
Sphingobium herbicidovorans NBRC16415	−	−	++	−	+++
Sphingobium yanoikuyae B1	−	−	++	−	+
Novosphingobium resinovorum KF1	−	−	+++	−	+

^*Abbreviations include: AhyR, AHL receptor from Aeromonas hydrophilia; LuxR, from Vibrio fisheri; TraR, from Agrobacterium tumefaciens; LasR, from Pseudomonas aeruginosa; CviR, from Chromobacterium violaceum.

^‡Scores for biosensor detection of AHL in strain extracts are based on the following criteria: -, < 2-fold higher than background levels of relative light units (RLU) bioluminescence; +, > 2-fold higher than background RLUs; ++, 50 to 75-fold higher than background RLUs; +++, > 75-fold higher than background in RLUs.

^#CviR, AHL-dependent receptor of biosensor strain CV026. Scores were relative violacein pigment production in T-streak bioassays on PDA/TYE (1:1) agar media.