Table 1.

MPN counts for saccharolytic populations in anoxic soil of flooded rice microcosms containing 45-day-old or 90-day-old rice plants

Substrate (concn)MPN count (no. of cells per g [dry wt] of soil)
45-Day-old plants90-Day-old plantsa
Amorphous cellulose (0.1% [wt/vol])2.3 × 106 (0.4 × 106–8.5 × 106)b 5.5 × 106 (0.9 × 106–27 × 106)
Filter paper cellulose (0.1% [wt/vol])2.3 × 106 (0.4 × 106–8.5 × 106)2.5 × 106 (0.4 × 106–9.4 × 106)
Microcrystalline cellulose (0.1% [wt/vol])3.1 × 105 (0.7 × 105–9.4 × 105)2.5 × 106 (0.4 × 106–9.4 × 106)
Xylan (0.1% [wt/vol])2.3 × 108 (0.4 × 108–8.5 × 108)2.5 × 108 (0.4 × 108–9.4 × 108)
Pectin (0.1% [wt/vol])4.9 × 107 (0.8 × 107–24 × 107)2.5 × 108 (0.4 × 108–9.4 × 108)
Sugar mixturec 9.4 × 107 (1.8 × 107–13 × 107)3.4 × 107 (0.8 × 107–10 × 107)
Glucose (4 mM)7.3 × 105 (1.4 × 105–31 × 105)5.9 × 106 (1.1 × 106–25 × 106)
Cellobiose (2 mM)4.1 × 106 (0.7 × 106–20 × 106)5.9 × 105 (1.1 × 105–25 × 105)
  • a DNA extracted from the same soil sample was used to generate the clone library used in a parallel study (27).

  • b The values in parentheses are 95% confidence intervals.

  • c The mixture contained 1 mM arabinose, 1 mM cellobiose, 1 mM fructose, 1 mM galactose, 1 mM glucose, 1 mM maltose, and 1 mM xylose.