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Int J Syst Evol Microbiol 57 (2007), 1770-1774; DOI  10.1099/ijs.0.64774-0
© 2007 International Union of Microbiological Societies

Streptomyces vietnamensis sp. nov., a streptomycete with violet–blue diffusible pigment isolated from soil in Vietnam

Hong-hui Zhu1, Jun Guo1, Qing Yao2, Song-zhen Yang1, Ming-rong Deng1, Le Thi Bich Phuong3, Vo Thi Hanh3 and Matthew J. Ryan4

1 Guangdong Provincial Microbial Culture Collection and Application Key Laboratory, Guangdong Institute of Microbiology, Guangzhou, Guangdong 510070, China
2 South China Agricultural University, Guangzhou, Guangdong 510642, China
3 Institute of Tropical Biology, Vietnamese Academy of Science and Technology, Ho Chi Minh City, Vietnam
4 CABI Bioscience UK Centre, Egham, Surrey, UK

Correspondence
Hong-hui Zhu
zhuhonghui66{at}yahoo.com.cn

An actinomycete, designated strain GIMV4.0001T, was isolated from a forest soil sample in Vietnam. It produced white aerial mycelium and violet–blue diffusible pigment on Gause's synthetic agar. The substrate mycelium colour was not sensitive to pH. Micoscopic observations revealed that strain GIMV4.0001T produced long, straight chains of cylindrical spores, and chemotaxonomic data confirmed that it belongs to the genus Streptomyces. Melanin was produced, but no antibacterial activity was evident against Escherichia coli, Pseudomonas aeruginosa, Bacillus subtilis, Candida albicans or Penicillium citrinum. Analysis of the 16S rRNA gene sequence of strain GIMV4.0001T revealed that the highest similarity (99.4 %) was to Streptomyces bikiniensis ATCC 11062T. However, the DNA–DNA relatedness between strain GIMV4.0001T and S. bikiniensis ATCC 11062T was found to be 50.3 %. Strain GIMV4.0001T could also be differentiated from S. bikiniensis ATCC 11062T and other Streptomyces species showing high 16S rRNA gene sequence similarity (98–99 %) based on morphological, physiological and biochemical characteristics. On the basis of its physiological and molecular properties, it is evident that strain GIMV4.0001T represents a novel species of the genus Streptomyces, for which the name Streptomyces vietnamensis sp. nov. is proposed. The type strain is GIMV4.0001T (=CCTCC M 205143T=IAM 15340T).

Abbreviations: DAP, diaminopimelic acid; ISP, International Streptomyces Project

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Streptomyces vietnamensis GIMV4.0001T is DQ311081.






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