Journal
SYSTEMATIC AND APPLIED MICROBIOLOGY
Volume 33, Issue 1, Pages 15-19Publisher
ELSEVIER GMBH
DOI: 10.1016/j.syapm.2009.11.002
Keywords
Aeromonas diversa sp nov.; Aeromonas group 501; Aeromonas sp HG13; Housekeeping genes
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Funding
- Ministerio de Ciencia a Innovacion, Spain [CGL2008-03281/BOS]
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The Aeromonas group 501, also named Aeromonas sp. HG13, is taxonomically close to A. schubertii. Results obtained in previous studies, including DNA-DNA hybridization and DNA fingerprinting, suggest that Aeromonas group 501 could constitute a different Aeromonas species. In this work we have performed a polyphasic study with the two strains comprising the Aeromonas sp. HG13 in order to propose a formal species name. They could be differentiated from A. schubertii by the indole and lysine decarboxylase tests and the utilization of L-lactate. Phenotypically, both strains were also easily separated from the other Aeromonas species. Sequence analysis of the 165 rRNA gene showed high sequence similarities (>97%) between Aeromonas group 501 and all Aeromonas species. Nevertheless, sequence divergences of cpn60, dnaJ, gyrB and rpoD genes were higher than the intraspecific threshold values established for each gene (3.5%, 3.3%, 2.3% and 2.6%, respectively), while sequence divergences between strains CDC 2478-85(T) and CDC 2555-87 were low (0.6-1.1%). The DNA G+C content of the type strain was 62.2 mol%. Phenotypic and genotypic evidence strongly suggests that the Aeromonas group 501 is a novel species of the genus Aeromonas, for which the name Aeromonas diversa sp. nov. is proposed. The type strain is CDC 2478-85(T) (=CECT 4254(T)=ATCC 43946(T)=LMG 17321(T)). (C) 2009 Elsevier GmbH. All rights reserved.
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