Table 2.

Strains isolated in this investigation

No. of cells per g (dry wt) of soilStrainTaxonaSubstratebAge of plants (days)
108 to 109 PB90-1 Verrucomicrobia Pectin90c
PB90-2CFB groupPectin90c
XB45CFB groupXylan45
XB90Clostridial cluster XIVaXylan90c
107 to 108 PB90-3 Verrucomicrobia Pectin90c
PB90-4 Actinobacteria Pectin90c
PB90-5 Actinobacteria Pectin90c
SB45 Bacillus sp.Sugar mixture45
SB90Clostridial cluster IXSugar mixture90c
Less than 107 VeSm15 Actinobacteria Sugar mixture90
VeCb6 Actinobacteria Cellobiose90
VeCb10Clostridial cluster ICellobiose90
VeGlc14 Actinobacteria d Glucose90
ACB45 Actinobacteria Amorphous cellulose45
ACB90 Verrucomicrobia Amorphous cellulose90c
KCB45 Actinobacteria Microcrystalline cellulose90c
KCB90α-Proteobacteria Microcrystalline cellulose90c
FCB45Clostridial cluster IIIFilter paper cellulose45
FCB90-1Clostridial cluster IIIFilter paper cellulose90c
FCB90-2Clostridial cluster IIIFilter paper cellulose90c
FCB90-3 Clostridium-like speciesFilter paper cellulose90c
  • a The designations of the phylogenetic groups are the designations used by Collins et al. (11), Hedlund et al. (26), Olsen et al. (39), and Stackebrandt et al. (48, 49).

  • b The strains were isolated in pure culture by using the substrates used in the MPN counting experiments in which they were originally obtained.

  • c Isolated from the soil sample used in a parallel clone library study (27).

  • d The taxon was identified only on the basis of phenotypic characteristics; no comparative 16S rRNA gene sequence analysis was performed with this strain.