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Int J Syst Evol Microbiol 57 (2007), 2376-2380; DOI  10.1099/ijs.0.65045-0
© 2007 International Union of Microbiological Societies

Rheinheimera texasensis sp. nov., a halointolerant freshwater oligotroph

Mubina M. Merchant{dagger}, Allana K. Welsh and Robert J. C. McLean

Department of Biology, Texas State University – San Marcos, 601 University Drive, San Marcos, TX 78666, USA

Correspondence
Robert J. C. McLean
McLean{at}txstate.edu

A Gram-negative, rod-shaped, motile, non-spore-forming bacterium, designated strain A62-14BT, was isolated from a constant-temperature, spring-fed, freshwater lake. On the basis of the complete 16S rRNA gene sequence, strain A62-14BT was shown to belong to the class Gammaproteobacteria, being most closely related to Rheinheimera sp. HTB082 (96.2 % sequence similarity), Rheinheimera baltica (95.01 %), Rheinheimera pacifica (96.35 %), Rheinheimera perlucida and Alishewanella fetalis (95.9 %). The major fatty acids (C16 : 1{omega}7c, 38.56 %; C16 : 0, 19.04 %; C12 : 0 3-OH, 12.83 %; C18 : 1{omega}7c, 7.70 %) and the motility of strain A62-14BT support its affiliation to the genus Rheinheimera. The salt intolerance of strain A62-14BT, together with the results of other physiological and biochemical tests, allowed the differentiation of this strain from the three species of the genus Rheinheimera with validly published names. Therefore strain A62-14BT represents a novel species of the genus Rheinheimera, for which the name Rheinheimera texasensis sp. nov. is proposed. The type strain is A62-14BT (=ATCC BAA-1235T=DSM 17496T). The description of the genus Rheinheimera is emended to reflect the halointolerance and freshwater origin of strain A62-14BT.

{dagger}Present address: Qiagen Inc., 27220 Turnberry Lane, Suite 200, Valencia, CA 91355, USA.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain A62-14BT is AY701891.

An expanded phylogenetic tree for strain A62-14BT and related taxa is available with the online version of this paper.






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