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Int J Syst Evol Microbiol 58 (2008), 2579-2581; DOI  10.1099/ijs.0.2008/000273-0
© 2008 International Union of Microbiological Societies

Photorhabdus temperata subsp. cinerea subsp. nov., isolated from Heterorhabditis nematodes

Tímea Tóth and Tamás Lakatos

Research and Extension Centre for Fruit Growing, Vadastag 2, H-4244 Újfehértó, Hungary

Correspondence
Tamás Lakatos
tamas.lakatos{at}gmail.com

During the characterization of symbiotic bacteria of Hungarian entomopathogenic nematode isolates, a number of bacteria (including strain 3107T) isolated from Heterorhabditis downesi and Heterorhabditis megidis showed only moderate 16S rRNA gene sequence similarity to the type strains of all described Photorhabdus species and subspecies. On the basis of the 16S rRNA gene sequence, the phylogenetic relationships of these isolates were uncertain, because of the low bootstrap values. Using gyrB sequences for phylogenetic analysis, these isolates were shown to be part of the species Photorhabdus temperata, with clear separation from both Palaearctic and American strains (phylogenetic distances are 6.9 and 7.9 %, respectively). Physiological properties and carbon-source utilization profiles supported the phylogenetic position of these strains; therefore, a novel subspecies, Photorhabdus temperata subsp. cinerea subsp. nov. is proposed, with the type strain 3107T (=DSM 19724T =NCAIM B 02271T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA and gyrB gene sequences of strain 3107T are EU136626 and EU053168, respectively.

Details of the sequences used for phylogenetic analysis and a 16S rRNA gene sequence-based neighbour-joining tree are available as supplementary material with the online version of this paper.






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