TABLE 1

Relative abundance of highly enriched OTUs in heavy fractions from [13C]cellulose SIP experiments with PP and BHS soilsa

Soil sample and OTURelative % abundance in:Fold enrichment (% abundance in heavy DNA/original soil)Taxonomy (phylum, class)Closest relative by BLAST analysis% identity to the closest relative
Heavy DNA fractionOriginal soil
PP soil
    823146.50.47856Actinobacteria, ActinobacteriaCatenulispora acidiphila99
    771820.7UD>1,900Proteobacteria, AlphaproteobacteriaTelmatospirillum siberiense94
    1008510.2UD>940Actinobacteria, ActinobacteriaCatenulispora yoronensis98
    75347.470.2134Proteobacteria, AlphaproteobacteriaBradyrhizobium elkanii100
BHS soil
    1296311.9UD>1,110Proteobacteria, AlphaproteobacteriaCaulobacter henricii98
    14483.09UD>280Proteobacteria, DeltaproteobacteriaPhaselicystis flava93
    111502.840.1224Proteobacteria, BetaproteobacteriaAquincola tertiaricarbonis99
    54452.480.09826Actinobacteria, ActinobacteriaCatenuloplanes crispus100
    8591.50UD>138Bacteroidetes, CytophagiaSporocytophaga myxococcoides99
    35531.280.03339Proteobacteria, AlphaproteobacteriaBrevundimonas denitrificans100
    107861.180>108Proteobacteria, AlphaproteobacteriaPhaeospirillum tilakii95
    62201.040.01195Proteobacteria, GammaproteobacteriaLysobacter niabensis98
  • a Only OTUs with >1% relative abundance and enriched at least 25-fold compared to the amount in unincubated soil are shown. On the basis of a Z test of ratios, all significance values (chance of sampling these differences from the same population) are <0.001. UD, no reads were detected in the original soil; the minimum fold enrichment in these cases was calculated by assuming 1 read in the original soil.