Table 6.

Population sizes of solitary bacteria and bacteria aggregated in biofilms on leaves of field-grown broad-leaf endive and parsley

Plant105 Total CFU/ga on:B/(B + S)b105 Fluorescent CFU/ga on:B/(B + S)b
SolitaryBiofilmSolitaryBiofilm
Endive82.3 (3.6)51.3 (7.7)0.382.7 (0.2)1.3 (0.3)0.32
65.8 (3.2)30.8 (2.6)0.320.8 (0.1)0.2 (0.1)0.20
201.0 (0.8)31.0 (3.8)0.134.1 (0.8)0.5 (0.3)0.11
Parsley62.2 (5.3)3.2 (0.4)0.0518.1 (0.2)0.1 (0.04)0.005
113.0 (8.5)20.5 (3.8)0.156.4 (1.3)0.9 (0.2)0.12
75.6 (10.4)15.4 (0.5)0.175.5 (0.4)1.1 (0.2)0.17
  • a Values represent the mean population size determined from three aliquots of washings of each leaf (endive) or each bunch of leaves (parsley). Values in parentheses are the standard error of the mean.

  • b B/(B + S) represents the frequency of biofilm (B) bacteria in the total population (biofilm + solitary [S]).