International Journal of Systematic and Evolutionary Microbiology, Vol 50, 451-457, Copyright © 2000 by Society for General Microbiology

ARTICLES

Alicyclobacillus hesperidum sp. nov. and a related genomic species from solfataric soils of Sao Miguel in the Azores

L Albuquerque, FA Rainey, AP Chung, A Sunna, MF Nobre, R Grote, G Antranikian and MS da Costa
Centro de Neurociencias de Coimbra, Departamento de Zoologia, Universidade de Coimbra, 3004-517 Coimbra, Portugal

Several acidophilic, slightly thermophilic or thermophilic Gram-positive isolates were recovered from solfataric soil at Furnas on the Island of Sao Miguel in the Azores. Phylogenetic analysis of the 16S rRNA gene sequence showed that these organisms represented two novel species of the genus Alicyclobacillus. Strains FR-11(T) and FR-1b had an optimum growth temperature of about 50 degrees C, whereas strains FR-3 and FR-6(T) had an optimum growth temperature of about 60 degrees C. Biochemical, physiological and chemotaxonomic characteristics did not distinguish isolates FR-3 and FR-6(T) from the type strain of Alicyclobacillus acidocaldarius; however, strains FR-11(T) and FR-1b could be easily distinguished from the type strain of Alicyclobacillus acidoterrestris by the carbon source assimilation pattern and the fatty acid composition. On the basis of the phylogenetic analysis, physiological and biochemical characteristics, and fatty acid composition the name Alicyclobacillus hesperidum is proposed for the species represented by strains FR-11(T) and FR-1b; a formal name for the new genomic species represented by strains FR-3 and FR-6(T) is not proposed at this time.

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