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Int J Syst Evol Microbiol 59 (2009), 1326-1330; DOI  10.1099/ijs.0.004713-0
© 2009 International Union of Microbiological Societies

Streptomyces plumbiresistens sp. nov., a lead-resistant actinomycete isolated from lead-polluted soil in north-west China

Jun Kang Guo{dagger}, Yan Bing Lin{dagger}, Mei Ling Zhao, Ran Sun, Ting Ting Wang, Ming Tang and Ge Hong Wei

College of Life Sciences, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Northwest A & F University, Yangling Shaanxi 712100, PR China

Correspondence
Ge Hong Wei
weigehong{at}yahoo.com.cn

The taxonomic position of an actinomycete isolated from a lead-polluted soil in Gansu province, north-west China, was determined by using a polyphasic approach. Chemical and morphological properties of the isolate, designated strain CCNWHX 13-160T, were similar to those of streptomycetes. Analysis of the almost complete 16S rRNA gene sequence placed strain CCNWHX 13-160T in the genus Streptomyces where it formed a distinct phyletic line with recognized Streptomyces species. The strain was most similar to Streptomyces pseudovenezuelae NBRC 12904T (98.9 %) and Streptomyces resistomycificus NBRC 12814T (98.8 %). Furthermore, DNA–DNA hybridization studies between the novel isolate and these two strains showed relatedness values of 49.7±0.8 and 43.2±1.1 %, respectively. It is proposed that strain CCNWHX 13-160T (=ACCC 41207T=HAMBI 2991T) be classified as the type strain of a novel species in the genus Streptomyces, Streptomyces plumbiresistens sp. nov. The MIC of Pb2+ for growth of strain CCNWHX 13-160T was 4.0 mM.

{dagger}These authors contributed equally to this work.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain CCNWHX 13-160T is EU526954.

The growth and culture characteristics of strain CCNWHX 13-160T on different media (Table S1), the fatty acid composition of strain CCNWHX 13-160T (Table S2), growth characteristics of strain CCNWHX 13-160T and related strains in the presence of various lead concentrations (Table S3) and a graph showing the effects of lead concentration on survival of strain CCNWHX 13-160T (Fig. S1) are available with the online version of this paper.






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