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Occurrence of Amino Sugars in Extracellular Polysaccharides of the Genus Rhizobium and Some Observations Regarding Their Distribution in Somatic Components¹

ABSTRACT

Chromatographic analysis of amino sugars in hydrolysates of some extracellular polysaccharide preparations from the genus Rhizobium revealed the occurrence of at least six amino sugars, of which three (glucosamine, galactosamine, and muramic acid) were positively identified. Not all of the amino sugars could be accounted for as structural components. Analysis of phenol-extractable polysaccharides and proteins from intact cells showed that the various species of Rhizobium differed greatly in the kinds and amounts of amino sugars they synthesized.

¹ Contribution from the Dept. of Agronomy, Univ. of Illinois, Urbana, and the Cornbelt Branch, Soil and Water Conservation Research Div., Agricultural Research Service, USDA, in cooperation with the Dept. of Soil Science, Univ. of Minnesota, St. Paul.

² Professor of Soil Chemistry, University of Illinois; Research Chemist, ARS, USDA and Associate Professor, University of Minnesota; and Assistant Professor, University of Illinois, respectively.

Received for publication March 20, 1970. Accepted for publication May 26, 1970.