Name: Affinirhizobium rhizoryzae (Zhang et al. 2014) Ma et al. 2025

Category: Species

Proposed as: comb. nov.

Basonym: Rhizobium rhizoryzae Zhang et al. 2014

Etymology: rhiz.o.ry’zae. Gr. fem. n. rhiza, root; L. gen. fem. n. oryzae, of rice; N.L. gen. fem. n. rhizoryzae, of rice roots

Gender: neuter

Type strain: ACCC 5916; DSM 19478; DSM 29514; J3-AN59; KCTC 23652

Conduct genome-based taxonomy at

16S rRNA gene: EF649779 Analyse FASTA

Effective publication: Ma T, Xue H, Piao C, Jiang N, Li Y. Phylogenomic reappraisal of the family Rhizobiaceae at the genus and species levels, including the description of Ectorhizobium quercum gen. nov., sp. nov. Front Microbiol 2023; 14:1207256.

IJSEM list: Oren A, Göker M. Validation list no. 225. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2025; 75:6863.

Nomenclatural status: validly published under the ICNP

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

• Synonyms:

  • Name	Kind
    Rhizobium rhizoryzae Zhang et al. 2014	homotypic synonym, validly published under the ICNP

• Notes:
  • 😢 The terminology used by the authors is in line with many other taxonomic studies and does not negatively affect their main results; some improvements may nevertheless be possible. Contrasting the term "chemotaxonomic" with "phenotypic" is not recommended. The phrase "validly described" is misleading. See the LPSN phylogeny page for details. Publication: Göker M. What can genome analysis offer for bacteria? In: Bridge P, Smith D, Stackebrandt E (eds), Trends in the systematics of bacteria and fungi, CAB International, Wallingford, 2021, p. 255-281.
  • 🧬 The phylogenomic assignment score of this taxon is 0.06765 (N = 15).
  • 🎓 Name mentioned 0 times in PubMed until 2025-10-21.
  • 🙆 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.

Parent taxon: Affinirhizobium Ma et al. 2025

Assigned by: Ma T, Xue H, Piao C, Jiang N, Li Y. Phylogenomic reappraisal of the family Rhizobiaceae at the genus and species levels, including the description of Ectorhizobium quercum gen. nov., sp. nov. Front Microbiol 2023; 14:1207256.

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Record number: 68002