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1 National Center for Genetic Engineering and Biotechnology;
2 King Mongkut's Institute of Technology Ladkrabang;
3 Resource Center, National Institute of Technology and Evaluation;
4 Novartis Pharma AG;
5 Kasetsart University
6 E-mail: fsciwck{at}ku.ac.th
Two novel bacterial strains were isolated from tropical rain forest soil, Thailand. Strains A-T 0875T and A-T 1383T were Gram-positive-staining, filamentous bacterial strains that developed cylindrical sporangia containing four oval- to rod-shaped spores at the ends of short sporangiophores on branched aerial mycelium. The cell-wall peptidoglycan contained meso-diaminopimelic acid, glutamic acid and alanine as cell-wall amino acids, the whole-cell hydrolysates contained rhamnose, madurose, glucose, galactose, and 3-O-methylmannose as whole-cell sugars. The predominant menaquinone was MK-9(H4). Mycolic acids were not detected. The diagnostic phospholipid was phosphatidylethanolamine. The predominant cellular fatty acids were iso-C16:0 and 10-methylated C17:0. The G+C content of the genomic DNA was 71 mol%. The phenotypic and chemotaxonomic analyses showed that our isolates had the typical characteristics of members of the genus Planotetraspora. Furthermore, the 16S rRNA gene sequence analysis also indicated that the strains belong to the genus Planotetraspora but as two putative novel species. Following an evaluation of phenotypic, chemotaxonomic and genotypic studies, the two new isolates are proposed as two novel species to be named Planotetraspora kaengkrachanensis sp. nov. (Type strain, A-T 0875T = BCC 24832T = NBRC 104272T) and Planotetraspora phitsanulokensis sp. nov. (Type strain, A-T 1383T = BCC 26045T = NBRC 104273T).
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