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Requirement of succinate dehydrogenase activity for symbiotic bacteroid differentiation of Rhizobium meliloti in alfalfa nodules.

By A E Gardiol, G L Truchet and F B Dazzo


Transmission electron microscopy was used to study the cellular morphologies of a wild-type Rhizobium meliloti strain (L5-30), a nitrogen fixation-ineffective (Fix-) succinate dehydrogenase mutant (Sdh-) strain, and a Fix+ Sdh+ revertant strain within alfalfa nodules and after free-living growth in a minimal medium containing 27 mM mannitol plus 20 mM succinate. The results showed a requirement of succinate dehydrogenase activity for symbiotic differentiation and maintenance of R. meliloti bacteroids within alfalfa nodules and for succinate-induced cellular pleomorphism in free-living cultures. Also, the Sdh- strain had a 3.5-fold lower rate of oxygen consumption in the defined medium than did the wild type

Topics: Research Article
Year: 1987
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Provided by: PubMed Central
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