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Biosynthesis of Sugars in Soils Incubated with ¹⁴C Glucose and ¹⁴C Dextran¹

ABSTRACT

Samples of soil were incubated for 28 days after the addition of ¹⁴C-labeled glucose or ¹⁴C-labeled dextran. Decomposition was monitored by measuring the release of CO₂ and determining its radioactivity throughout the incubation period. Soil samples were removed from the incubation at intervals, hydrolyzed to release individual monosaccharides, and the radioactivity of each sugar was measured.

The ¹⁴C from glucose or dextran was rapidly incorporated into galactose and mannose during the incubations; but xylose, arabinose, rhamnose and fucose embodied smaller amounts of ¹⁴C or none at all.

At the end of 28 days, 75% and 66% of the ¹⁴C had been liberated as CO₂ from the glucose and dextran incubations, respectively. Of the residual ¹⁴C in the soils after 28 days, about 6% from the glucose incubation and 15% from the dextran incubation, was present in saccharides and predominantly found in the hexoses.

A portion of the dextran was apparently protected from decomposition during the incubation.

¹ Contribution from the Department of Agronomy, Missouri Agr. Exp. Sta., Missouri Journal Series no. 7006. Approved by the Director.

² Post Doctoral Research Associate on leave from Waite Agr. Research Inst., Univ. of Adelaide, S. Australia; and Professor of Agronomy, Univ. of Missouri, Columbia 65201.

Received for publication February 1, 1971. Accepted for publication June 22, 1971.