Second site mutations specifically suppress the Fix- phenotype of Rhizobium meliloti ndvF mutations on alfalfa: identification of a conditional ndvF-dependent mucoid colony phenotype.

Abstract excerpt

Rhizobium meliloti mutants carrying ndvF insertion or deletion mutations induce nodules on alfalfa which contain very few infected cells and fail to fix N2 (Fix-). We have characterized five independent second site mutations (designated sfx) which completely suppress the Fix- phenotype of ndvF mutants on Medicago sativa but not on another R. meliloti host Melilotus alba. Genetic mapping and phenotypic analysis...

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