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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo International Journal of Systematic and Evolutionary Microbiology

Volume 73, Issue 5

sp. nov., a new nitrogen-fixing symbiovar isolated from root nodules of in Tunisia Open Access

Abstract

Three bacterial strains, 1AS11, 1AS12 and 1AS13, members of the new symbiovar salignae and isolated from root nodules of grown in Tunisia, were characterized using a polyphasic approach. All three strains were assigned to the complex on the basis of gene analysis. Phylogenetic analysis based on 1734 nucleotides of four concatenated housekeeping genes (, , and ) showed that the three strains were distinct from known rhizobia species of the complex and clustered as a separate clade within this complex. Phylogenomic analysis of 92 up-to-date bacterial core genes confirmed the unique clade. The digital DNA–DNA hybridization and -based average nucleotide identity values for the three strains and phylogenetically related species ranged from 35.9 to 60.0% and 87.16 to 94.58 %, which were lower than the 70 and 96% species delineation thresholds, respectively. The G+C contents of the strains were 60.82–60.92 mol% and the major fatty acids (>4 %) were summed feature 8 (57.81 %; C ω7) and C ω7 11-methyl (13.24%). Strains 1AS11, 1AS12 and 1AS13 could also be differentiated from their closest described species (, and ) by phenotypic and physiological properties as well as fatty acid content. Based on the phylogenetic, genomic, physiological, genotypic and chemotaxonomic data presented in this study, strains 1AS11, 1AS12 and 1AS13 represent a new species within the genus and we propose the name sp. nov. The type strain is 1AS11 (=DSM 113913=ACCC 62388).

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Keyword(s): Acacia saligna , nodules , Rhizobium acaciae and Rhizobium leguminosarum complex
Funding
This study was supported by the:
  • Agriculture and Agri-Food Canada (Award J-002272 and J-002295)
    • Principle Award Recipient: JamesT. Tambong
  • Ministère de l’Enseignement Supérieur, de la Recherche Scientifique et des Technologies de l'Information et de la Communication (Award 34MAG21)
    • Principle Award Recipient: bacemmnasri
© 2023 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2023-05-18
2025-03-18
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Rhizobium acaciae sp. nov., a new nitrogen-fixing symbiovar isolated from root nodules of Acacia saligna in Tunisia
Int J Syst Evol Microbiol 73, 005900 (2023); https://doi.org/10.1099/ijsem.0.005900
/content/journal/ijsem/10.1099/ijsem.0.005900
/content/journal/ijsem/10.1099/ijsem.0.005900
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