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《Plant Protection》 2010-06
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Identification of the antagonistic strain NK413 and its inhibitory effects on Magnaporthe oryzae

Du Chunmei1,2,Song Gang2,Zhao Dan2,Xu Baoxing2,Ding Yanjiao2,Ping Wenxiang1,2(1.Engineering Research Center for Agricultural Microbial Biotechnology,Ministry of Education,Harbin 150080,China;2.Key Laboratory of Microbiology,College of Life Sciences,Heilongjiang University,Harbin 150080,China)  
The strain NK413 was an antagonistic actinomycete,which was isolated from the soils in Heilongjiang.To provide basis for clarifying its taxonomic status and potential ability in field biocontrol,the multiphase taxonomy was carried out and three test methods,including cylinder plate method,mycelium growth rate method and hanging drop method,were used for evaluating its inhibitory activities and modes of NK413 on Magnaporthe oryzae in the laboratory.The results showed that its morphological properties,culture characteristics,physiological and biochemical characteristics were similar to those of Streptomyces albulus,and its cell wall composition was type I,and its phospholipid fatty acids were consistent with the characters of Steptomyces genus.In addition,the full length of 16S rDNA of the strain NK413 was 1 614 bp,while the homology and clustering analysis indicated that it belonged to S.albulus.Thus,NK413 was identified as Streptomyces albulus NK413.The antagonistic tests showed that NK413 had strong inhibitory activity on the growth of M.oryzae.The inhibitory zone reached 30mm in diameter,and it could strongly inhibit spore germination and mycelial growth of M.oryzae.The inhibition rate of germination reached 100%,when the fermentation was diluted(1∶1),but the hyphal growth was also inhibited by 100% by 1∶5 dilution.The antagonistic spectrum of NK413 was broad.This work suggested the potential ability of the stain NK413 for biocontrol of M.oryzae.
【Fund】: 黑龙江省科技计划项目(GC05B201)
【CateGory Index】: S435.111.41
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