Study on population diversity and antimicrobial activity ofactinomycete from acidic soil in Xizang area
西藏地区土壤放线菌种群多样性及拮抗活性研究

156 actinomycetes were isolated from 10 soil samples collected in Tibet by the method of DDC(dispersion and differential centrifugation). The isolates were assigned to 32 different groups on the basis of their morphological characters and colors of substrate mycelium,aerial hyphae and pigment. The result of cell-wall DAP on 65 representative strains selected from these groups was that 9 strains were different from Streptomyces.The analysis of ARDRA and 16S rDNA sequeces showed that the isolates belonged to the genus Streptomyces and five different rare actinomycete genera respectively.Antimicrobial activity of the representative strains was also tested, with the result that 38.5% isolates were positive.