Synthesis of Exopolysaccharide by Bradyrhizobium japonicum during Growth on Hydroaromatic Substrates.
The hydroaromatic acids shikimate and quinate, which may be available as carbon sources in the soil, supported production of only low levels of acidic exopolysaccharide by Bradyrhizobium japonicum. Exopolysaccharide production (micrograms per 10 cells) was 4.9 on quinate and 4.5 on shikimate; in comparison, it was 128 on adipate, 18 on l-arabinose, and 39 on d-glucose.
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Nitrogen Fixation and Soybean Genetics Laboratory, U.S. Department of Agriculture-Agricultural Research Service, Beltsville, Maryland 20705.