TABLE 2.

Competitiveness of two poplar recombinants (Pb3-1 and Pb5-1), a Rhizobium recombinant (35645A), P. fluorescens 2-79TOM, and two shrub recombinants (S-16 and H-25) against their respective hosts in rhizospheres of barley and wheat in sterile soil

Recombinant	Plant	Days after planting	% of recombinants	% of active TOM in recombinants	Total no. of organisms (CFU/cm of root or CFU/ml of PPB)a
Pb3-1	Barley	0	58	100	2.4 × 1010
		7	56 ± 40b	86 ± 17	8.0 × 105 ± 6.5 × 105
		14	49 ± 10	74 ± 18	8.5 × 105 ± 7.3 × 105
		21	57 ± 7	100 ± 0	1.7 × 105 ± 1.7 × 105
		28	68 ± 27	100 ± 0	1.8 × 105 ± 2.5 × 105
	Wheat	0	55	100	10.4 × 1010
		7	90 ± 8	100 ± 0	6.2 × 105 ± 9.4 × 105
		14	71 ± 27	99 ± 2	23 × 105 ± 10 × 105
		21	57 ± 23	96 ± 6	2.2 × 105 ± 1 × 105
		28	48 ± 9	93 ± 12	1.3 × 105 ± 1.5 × 105
Pb5-1	Barley	0	47	100	6.8 × 1010
		7	75 ± 5	100 ± 0	14 × 105 ± 9 × 105
		14	47 ± 24	96 ± 4	30 × 105 ± 12 × 105
	Wheat	0	47	100	1.7 × 1010
		7	46 ± 17	100 ± 0	25 × 105 ± 19 × 105
		15	73 ± 36	100 ± 0	10 × 105 ± 5 × 105
		21	80 ± 21	100 ± 0	7.2 × 105 ± 6.8 × 105
		28	60 ± 10	100 ± 0	0.98 × 105 ± 0.59 × 105
Rhizobium sp. strain 35645A	Barley	0	30	100	29.7 × 1010
		7	54 ± 18	39 ± 10	8.2 × 105 ± 7 × 105
		14	80 ± 10	100 ± 0	31 × 105 ± 11 × 105
		28	51 ± 31	91 ± 10	3.5 × 105 ± 3.7 × 105
	Wheat	0	63	100	9.0 × 1010
		7	24 ± 2	96 ± 7	53 × 105 ± 26 × 105
		15	53 ± 28	93 ± 12	33 × 105 ± 38 × 105
		21	60 ± 24	100 ± 0	12 × 105 ± 2.7 × 105
		28	43 ± 20	82 ± 10	5.9 × 105 ± 5.4 × 105
2-79TOMc	Barley	0	28	100	2.7 × 1010
		10	33	33	100 × 105
		25	31	80	4 × 105
	Wheat	0	28	100	2.7 × 1010
		10	22	33	50 × 105
		17	12	63	2.2 × 105
		25	16	33	9.5 × 105
S-16c	Barley	0	55	100	1.9 × 109
		10	22	67	50 × 105
		17	5	23	77 × 105
		25	16	57	22 × 105
	Wheat	0	55	100	1.9 × 109
		10	20	50	400 × 105
		17	9	75	17 × 105
		25	5	67	6 × 105
H-25c	Barley	0	93	100	5.7 × 1010
		10	75	75	100 × 105
		17	93	27	52 × 105
		25	93	86	23 × 105
	Wheat	0	93	100	5.7 × 1010
		10	35	75	140 × 105
		17	33	100	1.5 × 105
		25	31	25	6.5 × 105

^aThe zero-time data are expressed in CFU per milliliter of PPB; all other data are expressed in CFU per centimeter of root. 

^bMean ± standard deviation. 

^cOnly one 2-cm root sample was analyzed for each plant for these strains on each sampling day.