Table 1. Indole-3-acetic acid (IAA) levels in culture.

Strain	Supplementa	IAA ng/ml 24hrb	IAA ng/ml 48hrb
DC3000	N/A	28.9 ± 4.6	30.6 ± 3.5
DC3000	Trp	2520 ± 245	2760 ± 259
DC3000	IAAld	3700 ± 189	11700 ± 657
DC3000	IAM	144 ± 18	100 ± 11
DC3000	IAN	190c ± 7	301c ± 10
DC3000	IPyA	8820d ± 331	14100d ± 285
DC3000	TAM	107 ± 20	147 ± 10

^aDC3000 cultures grown in Hoitken-Sinden media with 10 mM citrate (HSC) and 0.25 mM of the indicated supplement.

^bHSC media supplemented with Trp, IAAld, IAM, or TAM accumulated no detectable levels of IAA in the absence of bacteria after 24 or 48 hrs of incubation. Values are average ± SEM (n = 3).

^cHSC media containing IAN but lacking DC3000 accumulated 111 ng/ml and 124 ng/ml of IAA at 24 and 48 hrs of incubation, respectively.

^dHSC media supplemented with IPyA but lacking DC3000 accumulated 17,000 ng/ml and 16,300 ng/ml of IAA at 24 hrs and 48 hrs of incubation, respectively. Similar results were obtained in two additional independent experiments.