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Int J Syst Evol Microbiol 59 (2009), 2383-2387; DOI  10.1099/ijs.0.010256-0
© 2009 International Union of Microbiological Societies

Micrococcus yunnanensis sp. nov., a novel actinobacterium isolated from surface-sterilized Polyspora axillaris roots

Guo-Zhen Zhao1,{dagger}, Jie Li1,{dagger}, Sheng Qin1, Yu-Qin Zhang1,2, Wen-Yong Zhu1, Cheng-Lin Jiang1, Li-Hua Xu1 and Wen-Jun Li1

1 The Key Laboratory for Microbial Resources of the Ministry of Education, and Laboratory for Conservation and Utilization of Bio-resources, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan 650091, PR China
2 Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China

Correspondence
Wen-Jun Li
wjli{at}ynu.edu.cn or
liact{at}hotmail.com

In this study, strain YIM 65004T, isolated from roots of Polyspora axillaris, was shown to represent a novel species of the genus Micrococcus by means of a polyphasic approach. Chemotaxonomic data gathered for peptidoglycan type, menaquinones, phospholipids and fatty acids strongly supported the classification of this strain within the genus Micrococcus: the cell-wall peptidoglycan contained lysine, glutamic acid, alanine, glycine and aspartic acid, the predominant menaquinones were MK-8(H2) (66.97 %) and MK-7(H2) (23.26 %), the phospholipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and an unknown ninhydrin-negative phospholipid, and the major cellular fatty acids were anteiso-C15 : 0 (61.98 %), iso-C16 : 0 (14.25 %) and iso-C15 : 0 (13.04 %). The G+C content of the genomic DNA was 71.7 mol%. A number of physiological features were found that clearly distinguished strain YIM 65004T from recognized Micrococcus species. DNA–DNA hybridization studies suggested that the novel strain represents a separate genomic species. Based on the above data, a novel species of the genus Micrococcus, Micrococcus yunnanensis sp. nov., is proposed, with the type strain YIM 65004T (=CCTCC AA 208060T=DSM 21948T).

{dagger}These authors contributed equally to this work.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain YIM 65004T is FJ214355.

A transmission electron micrograph of cells of strain YIM 65004T and a table comparing the fatty acid compositions of strain YIM 65004T and recognized Micrococcus species are available as supplementary material with the online version of this paper.






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