Name: Frankia inefficax Nouioui et al. 2017

Category: Species

Proposed as: sp. nov.

Etymology: in.ef’fi.cax. L. fem. adj. inefficax, inefficient in reference to the inability of the bacterium to form effective nitrogen-fixing symbiosis with its plant host

Pronunciation (Latin), gender: … in-EF-fi-kaks, feminine

Type strain: CECT 9037; DSM 45817; EuI1c

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: KX695197 Analyse FASTA

Effective publication: Nouioui I, Ghodhbane-Gtari F, Del Carmen Montero-Calasanz M, Rohde M, Tisa LS, Gtari M, Klenk HP. Frankia inefficax sp. nov., an actinobacterial endophyte inducing ineffective, non nitrogen-fixing, root nodules on its actinorhizal host plants. Antonie Van Leeuwenhoek 2017; 110:313-320. 🇹🇳

IJSEM list: Oren A, Garrity GM. Validation list no. 175. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2017; 67:1095-1098.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    Pseudofrankia inefficax (Nouioui et al. 2017) Gtari 2023	homotypic synonym, validly published under the ICNP

• Notes:
  • 😷 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 4 times in PubMed until 2025-06-04.

Parent taxon: Frankia Brunchorst 1886 (Approved Lists 1980)

Assigned by: Nouioui I, Ghodhbane-Gtari F, Del Carmen Montero-Calasanz M, Rohde M, Tisa LS, Gtari M, Klenk HP. Frankia inefficax sp. nov., an actinobacterial endophyte inducing ineffective, non nitrogen-fixing, root nodules on its actinorhizal host plants. Antonie Van Leeuwenhoek 2017; 110:313-320. 🇹🇳

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Record number: 795353