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Authors: Li, Yong Hua and Wang, Rui and Sui, Xin Hua and Wang, En Tao and Zhang, Xiao Xia and Tian, Chang Fu and Chen, Wen Feng and Chen, Wen Xin

Nine slow-growing rhizobia isolated from effective nodules on peanut (Arachis hypogaea) were characterized to clarify the taxonomic status using a polyphasic approach. They were assigned to the genus Bradyrhizobium on the basis of 16S rRNA sequences. MLSA of concatenated glnII-recA-dnaK genes classified them into three species represented by CCBAU 53390T, CCBAU 51670T and CCBAU 51778T, which presented the closest similarity to B. guangxiense CCBAU 53363T, B. guangdongense CCBAU 51649T and B. manausense BR 3351T, B. vignae 7-2T and B. forestalis INPA 54BT, respectively. The dDDH (digital DNA-DNA hybridization) and ANI (Average Nucleotide Identity) between the genomes of the three representative strains and type strains for the closest Bradyrhizobium species were less than 42.1% and 91.98%, respectively, below the threshold of species circumscription. Effective nodules could be induced on peanut and Lablab purpureus by all representative strains, while Vigna radiata formed effective nodules only with CCBAU 53390T and CCBAU 51778T. Phenotypic characteristics including sole carbon sources and growth features supported the phylogenetic results. Based on the genotypic and phenotypic features, strains CCBAU 53390T, CCBAU 51670T and CCBAU 51778T are designated the type strains of three novel species, for which the names Bradyrhizobium nanningense sp. nov., Bradyrhizobium guangzhouense sp. nov. and Bradyrhizobium zhanjiangense sp. nov. are proposed, respectively.Copyright © 2019 Elsevier GmbH. All rights reserved.

Journal: Systematic and applied microbiology
DOI: 10.1016/j.syapm.2019.126002
Year: 2019

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