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1 The Key Laboratory for Microbial Resources of the Ministry of Education, PR China, and Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Institute of Microbiology, Yunnan University, Kunming 650091, PR China
2 Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, PR China
3 DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstr. 7b, D-38124 Braunschweig, Germany
4 Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China
Correspondence
Wen-Jun Li
wjli{at}ynu.edu.cn
or
liact{at}hotmail.com
Two actinobacterial strains, YIM 65001T and YIM 65002T, were isolated from surface-sterilized plant tissues collected from Yunnan Province, south-west China, and their taxonomic positions were determined by using a polyphasic approach. The DNA G+C contents of strains YIM 65001T and YIM 65002T were 71.9 and 72.6 mol%, respectively. The two strains had chemotaxonomic markers that were consistent with their classification in the genus Dietzia. Phylogenetic analysis based on almost-complete 16S rRNA gene sequences indicated that strain YIM 65001T was related most closely to Dietzia maris DSM 43672T and that strain YIM 65002T was related most closely to Dietzia natronolimnaea CBS 107.95T. Levels of 16S rRNA gene sequence similarity between strains YIM 65001T and YIM 65002T and the type strains of other recognized members of the genus Dietzia were 95.8–99.8 %. DNA–DNA hybridization experiments confirmed the separate genomic status of strains YIM 65001T and YIM 65002T. Strains YIM 65001T and YIM 65002T showed significant phenotypic differences between each other and their closest recognized neighbours. On the basis of their phenotypic and phylogenetic distinctiveness, the two novel isolates were identified as representing two novel species of the genus Dietzia, for which the names Dietzia schimae sp. nov. (type strain YIM 65001T=CCTCC AA 207015T=DSM 45139T) and Dietzia cercidiphylli sp. nov. (type strain YIM 65002T=CCTCC AA 207016T=DSM 45140T) are proposed.
Two-dimensional thin-layer chromatograms of phospholipids of strains YIM 65001T and YIM 65002T and a table detailing the fatty acid profiles of strains YIM 65001T and YIM 65002T and of the type strains of closely related Dietzia species are available as supplementary material with the online version of this paper.
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