TABLE 1.

Antibacterial activity of P. chlororaphis YL-1 and mutants on LB plates and 1/2 TSA plates^a

Treatment	Inhibition zone diam (mm)
	LB				1/2 TSA
	Xoo	Bacillus megaterium	Erwinia amylovora	Xooc	Xoo	Bacillus megaterium	Erwinia amylovora	Xooc
YL-1	36.1 ± 1.1 A	6.2 ± 0.5 A	6.1 ± 0.2 A	33.1 ± 1.7 A	37.1 ± 1.2 A	39.7 ± 1.0 A	35.7 ± 1.3 A	29.1 ± 1.1 A
YL-1 ΔpvdS	37.0 ± 1.4 A	6.5 ± 0.3 A	6.1 ± 0.4 A	33.3 ± 1.2 A	7.0 ± 1.4 B	6.0 ± 1.2 B	9.5 ± 1.4 B	6.0 ± 1.2 B
YL-1 ΔpvdS(pUCP26-pvdS)	36.8 ± 1.2 A	6.2 ± 0.4 A	6.0 ± 0.3 A	35.4 ± 1.1 A	29.1 ± 1.1 A	30.2 ± 2.0 A	31.3 ± 1.2 A	25.2 ± 1.3 A
YL-1 ΔpvdS(pUCP26)	34.5 ± 1.3 A	6.0 ± 0.5 A	6.0 ± 0.5 A	31.7 ± 1.4 A	7.2 ± 1.5 B	7.9 ± 1.5 B	9.1 ± 1.5 B	6.1 ± 1.1 B
YL-1 ΔpvdL	33.8 ± 1.8 A	6.0 ± 0.7 A	6.1 ± 0.1 A	30.5 ± 1.3 A	8.3 ± 1.4 B	10.8 ± 1.7 B	6.5 ± 1.1 B	6.1 ± 1.2 B
YL-1 ΔpvdF	34.1 ± 1.2 A	6.1 ± 0.6 A	6.0 ± 0.2 A	34.1 ± 1.5 A	30.7 ± 1.3 A	36.7 ± 1.3 A	29.1 ± 1.5 A	25.4 ± 1.5 A
Water	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

^aValues in columns followed by the same letter were not significantly different according to Fisher's protected LSD test (P = 0.05).