TABLE 2.

Surface tension (in spent DMB medium) and swarming ability (on PDA and ABTG soft-agar media) recorded in CLP-producing P. fluorescens strain groups isolated from the sugar beet rhizosphere

P. fluorescens strain groupSurface tension (mN m−1) in spent DMB mediumaSwarming motility (mm h−1) onb:
PDAABTG
A127.4 ± 0.711
A227.4 ± 0.41.0 ± 0.31.6 ± 0.5
A326.9 ± 1.21.2 ± 0.61.7 ± 0.5
A426.7 ± 0.01.3 ± 0.51.2 ± 0.4
V126.8 ± 0.200.3 ± 0.1
V226.7 ± 0.200.4 ± 0.3
V324.7 ± 0.300.7 ± 0.3
V424.5 ± 0.10.5 ± 0.50.7 ± 0.3
Control 1c63.3 ± 6.600
Control 2d48.3 ± 5.700
  • a Surface tension in spent DMB medium after 2 days of incubation at 20°C is given as the mean of three replicates ± the standard deviation, except for control 1, which is given as the mean of six strains ± the standard deviation. Surface tension in uninoculated DMB medium was 71 mN m−1.

  • b Swarming velocity on PDA and ABTG media after 24 and 48 h of incubation at 20°C is given as the mean of 3 to 22 strains ± the standard deviation, except for those for groups A1 and control 2, which represent one strain.

  • c Strain group without CLP production.

  • d A1 mutant impaired in the peptide synthetase responsible for amphisin production (Koch et al., submitted).