Name: Azorhizobium caulinodans Dreyfus et al. 1988

Category: Species

Proposed as: sp. nov.

Etymology: cau.li.no’dans. L. masc. n. caulis, the stalk or stem of a plant; L. pres. part. nodans, furnishing with knots, nodulating; N.L. neut. part. adj. caulinodans, stem-nodulating

Pronunciation (Latin), gender: … ka͡u-li-NO-dans, neuter

Type strain: ATCC 43989; CCUG 26647; DSM 5975; IFO 14845; JCM 20966; LMG 6465; NBRC 14845; ORS 571

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: D11342 Analyse FASTA

Valid publication: Dreyfus B, Garcia JL, Gillis M. Characterization of Azorhizobium caulinodans gen. nov., sp. nov., a stem-nodulating nitrogen-fixing bacterium isolated from Sesbania rostrata. Int. J. Syst. Bacteriol. 1988; 38:89-98. 🇫🇷

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Emendations:
  • Hördt et al. 2020 Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 32. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2020; 70:4061-4090.

• Notes:
  • 🥇 Nomenclatural type of the genus Azorhizobium Dreyfus et al. 1988. Publication: Dreyfus B, Garcia JL, Gillis M. Characterization of Azorhizobium caulinodans gen. nov., sp. nov., a stem-nodulating nitrogen-fixing bacterium isolated from Sesbania rostrata. Int. J. Syst. Bacteriol. 1988; 38:89-98. 🇫🇷
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1. — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 225 times in PubMed until 2025-06-04.

Parent taxon: Azorhizobium Dreyfus et al. 1988

Assigned by: Dreyfus B, Garcia JL, Gillis M. Characterization of Azorhizobium caulinodans gen. nov., sp. nov., a stem-nodulating nitrogen-fixing bacterium isolated from Sesbania rostrata. Int. J. Syst. Bacteriol. 1988; 38:89-98. 🇫🇷

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Record number: 773587