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《Microbiology》 2009-06
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Identification of Antagonistic Strain P-13 and the Preliminary Studies on Its Antimicrobial Substances Against Bacterial Spot Diseases of Muskmelon

YANG Liang1,2 SHI Ying-Wu2 WU Zhong-Hong2,3 LOU Kai2 (1. College of Food, Shihezi University, Shihezi, Xinjiang 832003, China) (2. Institute of Microbiology, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China) (3. College of Food Science, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China)  
An actinomycete strain P-13, with antimicrobial activity against muskmelon bacterial spot pathogens, was isolated from the muskmelon rhizosphere soil samples in Xinjiang. The strain P-13 was identified as Streptomyces rochei based on morphological, physiological characteristics and 16S rRNA sequence analysis. The agar diffusion bioassay showed that the diameter of inhibition zone against Acidovorax avenae subsp. citrull BFB and Pseudomonas syringae pv. Lachrymans P4 was above 19 mm and 17 mm, respectively. The antimicrobial substances obtained from strain P-13 were demonstrated to be alkaline and water-soluble compounds according to paper chromatogram analysis and exocellular metabolites. Furthermore, it was stable to be treated by 100°C for 10 min, pH 6 for 6 h, or ultraviolet treatment for 7 h. Moreover, it was insoluble in organic solvents, such as petroleum benzine, diethyl ether, and acetic ether.
【Fund】: 农业部948项目(No2006-G62)
【CateGory Index】: S436.5;S476
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