The regulation of exopolysaccharide production is important at two levels of nodule development in Rhizobium meliloti.


We show that two exopolysaccharide overproducing Tn5 mutants of Rhizobium meliloti, exoR and exoS, have distinct symbiotic defects. While the exoR mutant is unable to colonize nodules, the exoS mutant retains that ability but varies in its ability to produce nitrogen-fixing nodules. We correlate these defects with different degrees of exopolysaccharide… (More)


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