Bradyrhizobia isolated from root nodules of Parasponia (Ulmaceae) do not constitute a separate coherent lineage

International Journal of Systematic and Evolutionary Microbiology
B LafayJeremy J Burdon

Abstract

Rhizobial bacteria almost exclusively nodulate members of the families Fabaceae, Mimosaceae and Caesalpiniaceae, but are found on a single non-legume taxon, Parasponia (Ulmaceae). Based on their host-range, their nitrogen-fixing ability and strain competition experiments, bacterial strains isolated from Parasponia were thought to constitute a separate lineage that would account for their exceptional host affinity. This hypothesis was investigated by focusing on four isolates that are representative of the morphological and cultural types of Parasponia-nodulating bradyrhizobia. Their evolutionary relationships with other rhizobia were analysed using 16S rRNA gene sequences and their nodulation properties were explored using the nodA gene as a proxy for host-range specificity. Phylogenetic analyses of the 16S rRNA and nodA gene sequences revealed that bacterial isolates from Parasponia species are embedded among other bradyrhizobia. They did not cluster together in topologies based on the 16S rRNA or nodA gene sequences, but were scattered among other bradyrhizobia belonging to either the Bradyrhizobium japonicum or the Bradyrhizobium elkanii lineages. These data suggest that the ability of some bradyrhizobia to nodulate species ...Continue Reading

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Dec 20, 2012·Antioxidants & Redox Signaling·Alain PuppoRenaud Brouquisse
Apr 3, 2007·Applied and Environmental Microbiology·Tomasz StepkowskiLionel Moulin
Mar 8, 2014·Critical Reviews in Microbiology·Michael Frederick Dunn
Jan 11, 2012·Molecular Phylogenetics and Evolution·Tomasz StępkowskiEmma T Steenkamp
Mar 1, 2012·The New Phytologist·Isabelle DamianiDidier Hérouart
Mar 13, 2013·Annals of Botany·Carole SantiClaudine Franche
Jan 1, 2018·Biology and Fertility of Soils·Sanjay K JaiswalFelix D Dakora

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