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A new species of root-nodulating bacteria in Lupinus from Tunisia

Most legumes establish a nitrogen-fixing, root nodule symbiosis with Proteobacteria, usually belonging to the family Rhizobiaceae (Rhizobium, Ensifer, ...) or Bradyrhizobiaceae (Bradyrhizobium). Species of Lupinus, a legume found both in Old World and New World environments, are usually nodulated by members of Bradyrhizobium. During a study on the bacteria isolated from root nodules of L. lupinus and L. micranthus plants isolated from Northern Tunisia, we found that many of the isolates, rather than being Bradyrhizobia, belong to the genus Microvirga, a member of the Methylobacteriaceae family that has seldom been associated with root nodules. This work presents the characterization of these hitherto undescribed bacteria and the definition of a new species of Microvirga, M. tunisiensis.

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Original Paper:

Msaddak, A., Rejili, M., Durán, D., Mars, M., Palacios, J.M., Ruiz-Argüeso, T., Rey, L., Imperial, J. 2019. Microvirga tunisiensis sp. nov., a root nodule symbiotic bacterium isolated from Lupinus micranthus and L. luteus grown in Northern Tunisia. Systematic and Applied Microbiology 126015. DOI: 10.1016/j.syapm.2019.126015

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