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Bifidobacterium psychraerophilum sp. nov. and Aeriscardovia aeriphila gen. nov., sp. nov., isolated from a porcine caecum

¹ Teagasc, Dairy Products Research Centre, Moorepark, Fermoy, Co. Cork, Ireland
² Alimentary Pharmabiotic Centre, Cork, Ireland
³ Department of Microbiology, University College Cork, Cork, Ireland

Correspondence
Catherine Stanton
cstanton{at}moorepark.teagasc.ie

In a previous study that was based primarily on 16S rDNA sequencing, two groups of bifidobacteria that had been recovered from a pig caecum were proposed to belong to two novel species, termed ‘Bifidobacterium pyschroaerophilum’ and ‘Bifidobacterium aerophilum’. In this study, based on DNA G+C content and partial heat-shock protein 60 (HSP60) gene sequences, the assignment of ‘B. pyschroaerophilum’, corrected to Bifidobacterium pyschraerophilum, to the genus Bifidobacterium was confirmed. The DNA G+C content of ‘B. aerophilum’ was relatively low, which was consistent with its segregation into subcluster II of the 16S rDNA phylogenetic tree. Based on partial 16S rDNA and HSP60 gene sequences, the species was transferred to a novel genus and reclassified as Aeriscardovia aeriphila gen. nov., sp. nov. Biochemical profiles and growth parameters were established for both novel species. Interestingly, each had a high tolerance to oxygen and grew on agar media under aerobic conditions, a trait that may relate to their caecal habitat. Under aerobic growth conditions, the short-rod morphology of A. aeriphila lengthened considerably. This appeared to arise from incomplete cell division. In addition, B. pyschraerophilum was unusual in that it grew at temperatures as low as 4 °C. On the basis of genetic, phylogenetic and phenotypic data, the identities of Bifidobacterium pyschraerophilum sp. nov. (type strain, T16^T=LMG 21775^T=NCIMB 13940^T) and Aeriscardovia aeriphila gen. nov., sp. nov. (type strain, T6^T=LMG 21773^T=NCIMB 13939^T) are confirmed.

Published online ahead of print on 12 September 2003 as DOI 10.1099/ijs.0.02667-0.

The GenBank/EMBL/DDBJ accession numbers for the partial HSP60 gene sequences of LMG 21775^T (=NCIMB 13940^T), LMG 21773^T (=NCIMB 13939^T) and LMG 21774 are AY339132, AY339131 and AY339130, respectively.

Phase-contrast and whole-cell FISH images of strains studied in this paper are available as supplementary material in IJSEM Online.

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