Name: Allorhizobium undicola de Lajudie et al. 1998

Category: Species

Proposed as: sp. nov.

Etymology: un.di’co.la. L. fem. n. unda, water; L. masc./fem. n. suff. -cola, dweller; N.L. masc./fem. n. undicola, water-dweller, referring to the isolation of these strains from nodules of the aquatic plant Neptunia natans (nominative in apposition)

Pronunciation, gender: un-DI-ko-la, neuter

Type strain: ATCC 700741; CIP 105883; JCM 21822; LMG 11875; ORS 992

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: Y17047 Analyse FASTA

Valid publication: de Lajudie P, Laurent-Fulele E, Willems A, Torck U, Coopman R, Collins MD, Kersters K, Dreyfus B, Gillis M. Allorhizobium undicola gen. nov., sp. nov., nitrogen-fixing bacteria that efficiently nodulate Neptunia natans in Senegal. Int J Syst Bacteriol 1998; 48:1277-1290. 🇧🇪

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 48, part 4 of the IJSB. Int J Syst Bacteriol 1999; 49:5-6.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

Risk group: 1

• Synonyms:

  • Name	Kind
    Rhizobium undicola (de Lajudie et al. 1998) Young et al. 2001	homotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus Allorhizobium de Lajudie et al. 1998. Publication: de Lajudie P, Laurent-Fulele E, Willems A, Torck U, Coopman R, Collins MD, Kersters K, Dreyfus B, Gillis M. Allorhizobium undicola gen. nov., sp. nov., nitrogen-fixing bacteria that efficiently nodulate Neptunia natans in Senegal. Int J Syst Bacteriol 1998; 48:1277-1290. 🇧🇪
  • 📧 The e-mail address of the corresponding author given in the effective publication is not functional any more.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 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 7 times in PubMed until 2025-06-04.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this species. The name is on LoRN because of the recorded pathogenicity of other species in the genus.
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: 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. 🇩🇪
  • 🧍 The reclassification of Allorhizobium undicola de Lajudie et al. 1998 as Rhizobium undicola (de Lajudie et al. 1998) Young et al. 2001 is no longer justified as Mousavi et al. 2015 showed that the genera Rhizobium and Allorhizobium form distinct clades in a phylogenetic tree of 116 rhizobial and agrobacterial strains. Publication: Frank B. Über die Pilzsymbiose der Leguminosen. Berichte der Deutschen Botanischen Gesellschaft 1889; 7:332-346.

Parent taxon: Allorhizobium de Lajudie et al. 1998

Assigned by: de Lajudie P, Laurent-Fulele E, Willems A, Torck U, Coopman R, Collins MD, Kersters K, Dreyfus B, Gillis M. Allorhizobium undicola gen. nov., sp. nov., nitrogen-fixing bacteria that efficiently nodulate Neptunia natans in Senegal. Int J Syst Bacteriol 1998; 48:1277-1290. 🇧🇪

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Record number: 783352