TABLE 2.

Mutant phenotypes

Mutant	Mutated gene	Halo on CAS mediuma	Rhizobactin uptake	Outer membrane receptor protein
2011	Wild type	++	Yes	Abundant
2011 rhbA62	rhbA	−	Yes	Reduced
2011 rhbC2	rhbC	−	Yes	NTb
2011 rhbE9	rhbE	−	Yes	Reduced
2011 rhbE11	rhbE	−	Yes	Reduced
2011 rhbF104	rhbF	−	Yes	Reduced
2011 rhbF107	rhbF	−	Yes	Reduced
2011 rhrA4	rhrA	−	No	None
2011 rhrA6	rhrA	−	No	None
2011 rhrA26	rhrA	−	No	None
2011 rhtA45	rhtA	+++	No	None
2011 rhtA42	rhtA	+++	No	None
2011 rhtA1	rhtA	+++	No	None

^a−, No halo; ++, large halo; +++, very large halo. The CAS assay and bioassay phenotypes have been shown previously (46, 53). The levels of outer membrane receptor proteins are shown in Fig. 1. 

^bNT, not tested.