A Preliminary Study on the Thermostreptomyces Strain 24 #
高温链霉菌24＃的初步研究

The 24# strain of Streptomyces sp. producing broad-scope,high activities and antifungal substances were isolated from the soil. In screening process of agriculture antagonistic strains, streptomyces strain 24# was isolated from soil in Shandong. The antifungal substances have notable antagonistic effects of phytopathogens and can cause the mycelia of the phytopathogens breaking, twisting and constricting. The 16S rDNA sequence homology between the strain 24# and model strain S. DSM44293~(T) is 98.93%. However, the morphological and culture characteristics, the chemical components of the cell walls, the physiological and biochemical characteristics of the strain are different to those of the model strain, and the ratio of the DNA-DNA hybridization is only 22.54%. The name Streptomyces shandongensis sp. nov. is proposed for strain 24#.