TABLE 1.

Bacterial strains used in this study

Pseudomonas putida strain	Description/genotype	Reference
S-313	Prototroph; utilizes arylsulfonates as sulfur source	50
S-313R	Rifampin-resistant derivative of strain S-313	19
SN36	asfA::miniTn5Km derivative of strain S-313; unable to utilize arylsulfonates as sulfur source	48
PH18	sftR::miniTn5Km derivative of strain S-313; unable to utilize sulfate esters as sulfur source	19
SN34	ssuE::miniTn5Km derivative of strain S-313; unable to utilize sulfonates or sulfate esters as sulfur source	20