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  • Title: Rhizobium flavum sp. nov., a triazophos-degrading bacterium isolated from soil under the long-term application of triazophos.
    Author: Gu T, Sun LN, Zhang J, Sui XH, Li SP.
    Journal: Int J Syst Evol Microbiol; 2014 Jun; 64(Pt 6):2017-2022. PubMed ID: 24639241.
    Abstract:
    A Gram-stain-negative, non-motile, pale yellow, rod-shaped bacterial strain, YW14(T), was isolated from soil and its taxonomic position was investigated by a polyphasic study. Strain YW14(T) did not form nodules on three different legumes, and the nodD and nifH genes were not detected by PCR. Strain YW14(T) contained Q-10 as the predominant ubiquinone. The major cellular fatty acid was C(18 : 1)ω7c. Phylogenetic analyses based on 16S rRNA gene sequences and seven housekeeping gene sequences (recA, atpD, glnII, gyrB, rpoB, dnaK and thrC) showed that strain YW14(T) belonged to the genus Rhizobium. Strain YW14(T) showed 16S rRNA gene sequence similarity of 93.4-97.3% to the type strains of recognized species of the genus Rhizobium. DNA-DNA relatedness between strain YW14(T) and the type strains of Rhizobium sullae IS123(T) and Rhizobium yanglingense CCBAU 71623(T) was 19.6-25.7%, indicating that strain YW14(T) was distinct from them genetically. Strain YW14(T) could also be differentiated from these phylogenetically related species of the genus Rhizobium by various phenotypic properties. On the basis of phenotypic properties, phylogenetic distinctiveness and genetic data, strain YW14(T) is considered to represent a novel species of the genus Rhizobium, for which the name Rhizobium flavum sp. nov. is proposed. The type strain is YW14(T) ( = KACC 17222(T) = CCTCC AB2013042(T)).
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