TABLE 3.

TCE microcosm data and parameters

Samplea	Extent of TCE degradation (% of TCE removed)	Avg TCE degradation (% of TCE removed)	Length of expt (days)	Root colonization (105, CFU/cm of root)	Initial degradation rate (nmol/day · plant)b	Length of plant growth before TCE was added (days)	No. of seeds
Uninoculated microcosm 1	19	9 ± 8c	12	NAd	0	5	100
Uninoculated microcosm 2	4		9	NA	2	5	140
Uninoculated microcosm 3	5		6	NA	2	7	130
Sterile soil microcosm 1	3	4 ± 1	6	NA	0	NA	NA
Sterile soil microcosm 2	5		6	NA	0	NA	NA
2-79 microcosm 1	26	13 ± 7	11	NDe	7	7	110
2-79 microcosm 2	7		6	7 ± 2	1	7	160
2-79 microcosm 3	16		7	16 ± 8	5	7	160
2-79 microcosm 4	15		6	11 ± 4	2	7	160
2-79 microcosm 5	6		6	6 ± 5	1	7	160
2-79 microcosm 6	10		6	5 ± 2	0	7	160
2-79TOM microcosm 1	53	63 ± 11	6	ND	12	8	150
2-79TOM microcosm 2	67		6	ND	22	8	150
2-79TOM microcosm 3	85		6	ND	39	8	150
2-79TOM microcosm 4	48		7	0.7 ± 0.03	15	6	160
2-79TOM microcosm 5	65		7	11 ± 9	26	6	160
2-79TOM microcosm 6	63		7	2 ± 1	24	6	160
2-79TOM microcosm 7	62		7	10 ± 2	15	6	175
2-79TOM microcosm 8	71		7	9 ± 4	14	6	175
2-79TOM microcosm 9	55		7	5 ± 4	19	6	175

^aUninoculated microcosms contained sterilized soil and wheat; 2-79 microcosms contained sterilized soil, wheat, and P. fluorescens 2-79; and 2-79TOM microcosms contained sterilized soil, wheat, and P. fluorescens 2-79TOM. The initial TCE concentration in all microcosms was 128 μM (assuming that all of the TCE was in 50 ml of water in each microcosm jar). 

^bThe initial TCE degradation rate was determined by determining the difference between the TCE concentrations in the headspace obtained 3 and 24 h after TCE was added. 

^cMean ± standard deviation. 

^dNA, not applicable. 

^eND, not determined.