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Amino Components of Soil Organic Matter Formed During Humification of ¹⁴C Glucose¹

ABSTRACT

After a 6-month period of incubation of ¹⁴C glucose in soil, the soil organic matter was acid hydrolyzed and amino compounds were isolated by ion exchange chromatography. The 13 major amino compounds contained 17 to 22% of the radioactive carbon that had become incorporated into the soil organic matter. Although all of the amino compounds were labeled with ¹⁴C the amount of label was not the same in all cases. Amino compounds with the highest specific activities were those which are known to predominate in bacterial and fungal cell walls. The results suggest that the cell walls of microorganisms utilizing glucose are more resistant to further decomposition than are the cytoplasmic proteins.

¹ Contribution from the Department of Soils, Missouri Agr. Exp. Sta., Missouri Journal Series no. 5263. Approved by the Director.

² Associate Professor of Soils and Post Doctoral Fellow in Soils, respectively, University of Missouri, Columbia.

Received for publication March 12, 1968. Accepted for publication April 16, 1968.