The diversity and anti-microbial activity of endophytic actinomycetes isolated from medicinal plants in Panxi plateau, China

Curr Microbiol. 2011 Jan;62(1):182-90. doi: 10.1007/s00284-010-9685-3. Epub 2010 Jun 22.

Abstract

Traditional Chinese medicinal plants are sources of biologically active compounds, providing raw material for pharmaceutical, cosmetic and fragrance industries. The endophytes of medicinal plants participate in biochemical pathways and produce analogous or novel bioactive compounds. Panxi plateau in South-west Sichuan in China with its unique geographical and climatological characteristics is a habitat of a great variety of medicinal plants. In this study, 560 endophytic actinomycetes were isolated from 26 medicinal plant species in Panxi plateau. 60 isolates were selected for 16S rDNA-RFLP analysis and 14 representative strains were chosen for 16S rDNA sequencing. According to the phylogenetic analysis, seven isolates were Streptomyces sp., while the remainder belonged to genera Micromonospora, Oerskovia, Nonomuraea, Promicromonospora and Rhodococcus. Antimicrobial activity analysis combined with the results of amplifying genes coding for polyketide synthetase (PKS-I, PKS-II) and nonribosomal peptide synthetase (NRPS) showed that endophytic actinomycetes isolated from medicinal plants in Panxi plateau had broad-spectrum antimicrobial activity and potential natural product diversity, which further proved that endophytic actinomycetes are valuable reservoirs of novel bioactive compounds.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actinobacteria / classification
  • Actinobacteria / genetics
  • Actinobacteria / isolation & purification*
  • Actinobacteria / metabolism*
  • Anti-Infective Agents / metabolism*
  • Bacterial Typing Techniques
  • China
  • Cluster Analysis
  • DNA Fingerprinting
  • DNA, Bacterial / chemistry
  • DNA, Bacterial / genetics
  • DNA, Ribosomal / chemistry
  • DNA, Ribosomal / genetics
  • Molecular Sequence Data
  • Phylogeny
  • Plants, Medicinal / microbiology*
  • Polymorphism, Restriction Fragment Length
  • RNA, Ribosomal, 16S / genetics
  • Sequence Analysis, DNA

Substances

  • Anti-Infective Agents
  • DNA, Bacterial
  • DNA, Ribosomal
  • RNA, Ribosomal, 16S

Associated data

  • GENBANK/GQ118918
  • GENBANK/GQ118919
  • GENBANK/GQ118920
  • GENBANK/GQ118921
  • GENBANK/GQ118922
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  • GENBANK/GQ118927
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  • GENBANK/GQ118951
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  • GENBANK/GQ118957
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  • GENBANK/GQ118960
  • GENBANK/GQ118961