Table 3.

The parameters of biofilms formed by the R. leguminosarum bv. trifolii wild type and Rt2472 rosR mutant.

Strain	Ratio of live/dead cells	Depth of biofilm (μm)	Area covered by biofilm (%)	Fractal dimension (scalar units)	Outline (×103) (μm)
Rt24.2	51.06 ± 6.12	47.33 ± 1.15	87.57 ± 6.36	1.425 ± 0.05	109.25 ± 5.9
Rt2472	27.53 ± 4.57†	25.66 ± 1.52†	50.17 ± 5.08†	1.325 ± 0.14	69.71 ± 1.2†
Rt2472(pRC24)	71.86 ± 3.07	54.26 ± 3.94	88.82 ± 8.78	1.417 ± 0.06	113.57 ± 10.8

† Difference between the wild type and the rosR mutant is statistically significant at P < 0.05 (Student's t test).