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Department of Microbiology, College of Biology, Beijing Agricultural University, Beijing, People's Republic of China
* Corresponding author.
ABSTRACT
Nine bacterial strains isolated from root nodules of Astragalus sinicus were compared with 41 reference strains, including the type strains of the type species of the genera Rhizobium, Bradyrhizobium, and Agrobacterium, by performing a numerical analysis of 200 phenotype features. Representative strains belonging to different clusters were further compared with similar bacteria by using data from gel electrophoresis of whole-cell proteins, DNA G+C content data, and DNA-DNA hybridization data. The rhizobial strains isolated from nodules of A. sinicus constitute a distinct homology group that is quite different from previously described Rhizobium, Bradyrhizobium, and Agrobacterium species and from strains isolated from other Astragalus species. We propose the name Rhizobium huakuii sp. nov. for the strains isolated from A. sinicus. Type strain CCBAU 2609 (= 103) has been deposited in the Culture Collection of Beijing Agricultural University, Beijing, People's Republic of China.
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