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1 Biotechnology Research Centre, La Trobe University, Bendigo, Victoria 3550, Australia
2 Faculty of Science and Technology, Griffith University, Nathan, Brisbane, Queensland 4111, Australia
3 DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, D-38124 Braunschweig, Germany
4 Centre for Microscopy and Microanalysis, Dept of Microbiology, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia
5 CRC Freshwater Ecology Research Centre, Albury, New South Wales 2640, Australia
Author for correspondence: R.J. Seviour. Tel: +61 0354 447459. Fax: +61 0354 447476. e-mail: r.seviour{at}latrobe.edu.au
ABSTRACT
Two Gram-positive, non-motile, non-spore-forming, strictly aerobic, pigmented cocci, strains Ben 107T and Ben 108T, growing in aggregates were isolated from activated sludge samples by micromanipulation. Both possessed the rare type A3
’ peptidoglycan. Major menaquinones of strain Ben 107T were MK-9(H4) and MK-7(H2), and the main cellular fatty acid was 12-methyltetradecanoic acid (ai-C15:0). In strain Ben 108T, MK-9(H4), MK-9(H2) and MK-7(H4) were the menaquinones and again the main fatty acid was 12-methyltetradecanoic acid (ai-C15:0). Polar lipids in both strains consisted of phosphatidyl inositol, phosphatidyl glycerol and diphosphatidyl glycerol with two other unidentified glycolipids and phospholipids also present in both. These data, together with the 16S rDNA sequence data, suggest that strain Ben 107T belongs to the genus Friedmanniella which presently includes a single recently described species, Friedmanniella antarctica. Although the taxonomic status of strain Ben 108T is far less certain, on the basis of its 16S rRNA sequence it is also adjudged to be best placed in the genus Friedmanniella. The chemotaxonomic characteristics and DNA-DNA hybridization data support the view that Ben 107T and Ben 108T are novel species of the genus Friedmanniella. Hence, it is proposed that strain Ben 107T (= ACM 5121T) is named as Friedmanniella spumicola sp. nov. and strain Ben 108T (= ACM 5120T) as Friedmanniella capsulata sp. nov.
Key Words: activated sludge • G-bacteria • Gram-positive cocci • Friedmanniella • Microlunatus
The GenBank accession numbers for the 16S rRNA sequences of strains Ben 107T (= ACM 5121T) and Ben 108T (= ACM 5120T) are AF062535 and AF084529, respectively.
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