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Int J Syst Evol Microbiol 56 (2006), 1991-1995; DOI  10.1099/ijs.0.64238-0
© 2006 International Union of Microbiological Societies

Hoeflea alexandrii sp. nov., isolated from the toxic dinoflagellate Alexandrium minutum AL1V

Lucía Palacios1, David R. Arahal2, Beatriz Reguera3 and Irma Marín1

1 Centro de Biología Molecular ‘Severo Ochoa’, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
2 Colección Española de Cultivos Tipo (CECT) and Departamento de Microbiología y Ecología, Universitat de València, 46100 Burjassot, València, Spain
3 Instituto Español de Oceanografía, Centro Oceanográfico de Vigo, PO Box 1552, 36200 Vigo, Pontevedra, Spain

Correspondence
Irma Marín
imarin{at}cbm.uam.es

A Gram-negative, aerobic, non-symbiotic bacterium (AM1V30T) was isolated from the toxic dinoflagellate Alexandrium minutum AL1V. On the basis of 16S rRNA gene sequence similarity, strain AM1V30T was most closely related (97.4 % similarity) to the type strain of Hoeflea marina, which belongs to the family Phyllobacteriaceae within the order Rhizobiales of the class Alphaproteobacteria. A polyphasic approach was used to clarify the taxonomic position of strain AM1V30T. During the course of this study, a second species was described by others as belonging to the genus Hoeflea, namely Hoeflea phototrophica; it showed a somewhat higher level of 16S rRNA gene sequence similarity with respect to strain AM1V30T (98.2 %) and was also taken into account. The fatty acid profiles, physiological and biochemical data and DNA G+C content (59.7 mol%) support the classification of strain AM1V30T as a member of the genus Hoeflea. The characteristics of the novel strain were sufficiently distinct to indicate that it represents a separate species. To confirm this conclusion, DNA–DNA hybridizations were performed: low values (between 15.8 and 29.8 %) were obtained in all cases. Thus, AM1V30T represents a novel species within the genus Hoeflea, for which the name Hoeflea alexandrii sp. nov. is proposed. Strain AM1V30T (=CECT 5682T=DSM 16655T) is the type strain.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain AM1V30T is AJ786600.

Transmission electron micrographs of strain AM1V30T are available as a supplementary figure in IJSEM Online.






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