Abstract
Rhizobium meliloti mutant strains have been found which, in the presence of low concentrations of NaCl, produce a galactoglucan instead of the usual succinoglycan. When grown in a mannitol-glutamic acid-salts medium, the principal products secreted by R. meliloti YE-2Sl were comparable quantities of succinoglycan repeating-units and galactoglucan. As NaCl was added progressively to the culture medium, the repeating units nearly completely disappeared and the galactoglucan was gradually replaced by a succinoglycan.
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