TABLE 2.

QQ capabilities of P. fluorescens strain 1855-344 harboring qsdA

P. carotovorum PCC 797 concn (cells ml−1)a	Pathogen/quencher ratio	Avg extent of maceration zone (cm) ± SE with P. fluorescens 1855-344 carryingb:
		pME6032	pSU40
105	1:10	2.6 ± 0.5	NM
	1:1	2.8 ± 0.5	NM
	10:1	2.5 ± 0.6	2.2 ± 0.8
106	1:10	2.8 ± 0.4	NM
	1:1	2.8 ± 0.5	NM
	10:1	2.8 ± 0.5	2.8 ± 0.8

^aConcentration of the P. carotovorum cell suspension used for inoculation of potato tubers.

^bTaken from three repeats. NM, no maceration observed.