[ Objective] The paper wag to improve the antimicrobial effect of antagonistic Streptomyces on Botryosphaeria dothidea. [ Method ] Different concentrations of DES were adopted for mutagenic treatment of antagonistic S...[ Objective] The paper wag to improve the antimicrobial effect of antagonistic Streptomyces on Botryosphaeria dothidea. [ Method ] Different concentrations of DES were adopted for mutagenic treatment of antagonistic Streptomyces F-58. After fermentation, the mutant strain numbered F-58-06 with genetic stability and good antimicrobial effect was selected among 200 mutant strains; the biological activity of the strain was determined with B. dothidea as the indicator fungus, and the best concentration of DES wag 2%. The fermentation conditions of antagonistic substances of Streptomyces strain F-58-06 produced in shake flasks were opti- mized using the method of single factor and orthogonal experimental design. [ Result] The optimal fermentation conditions were carbon source corn flour, nitrogen source KNO3, initial pH 7, loading volume 30 mL in 250 mL shake flask, inoculation volume 3%, incubation time 132 h. Based on orthogonal experiments, the best cultured medium ratio was corn flour 4%, KNO3 0.5%, CaCO3 0.2%, NaCI 0.35%, MgSO4 · 7H2O 0. 15%. [ Conclusion ] After mutation and optimization of culture medium, the antimicrobial activity of Streptomyces F-58 was greatly improved, and the average inhibition zone diameter was 1.35 times of that of the original strain.展开更多
【目的】明确中国陕南地区核桃树溃疡病成因。【方法】对陕西南部主要核桃产区的病害流行情况进行跟踪调查,从典型的枝干病灶组织中分离到了该病的致病菌,应用柯赫氏法则验证了该致病菌的致病性,同时根据形态学特征和ITS序列分析对病原...【目的】明确中国陕南地区核桃树溃疡病成因。【方法】对陕西南部主要核桃产区的病害流行情况进行跟踪调查,从典型的枝干病灶组织中分离到了该病的致病菌,应用柯赫氏法则验证了该致病菌的致病性,同时根据形态学特征和ITS序列分析对病原菌进行鉴定,并利用BLAST软件将测序所得真菌ITS序列与NCBI(National Center for Biotechnology Information)数据库中已登录的序列进行同源序列比对,获得其分类地位,利用MEGA 5.0软件构建系统发育树。【结果】陕西南部核桃溃疡病的病原菌形态特征与葡萄座腔菌相符合,其ITS序列与已公布的葡萄座腔菌的ITS序列相似度为99.8%,系统发育树分析结果与之一致。【结论】陕西南部核桃溃疡病的病原菌为葡萄座腔菌(Botryosphaeria dothidea)。展开更多
基金Supported by Special Fund for Forestry Scientific Research in the Public Welfare(201204501)Key Theoretical Basis for Prevention and Control Technology of Forest Diseases and Pests & Key Science and Technology Project of Jilin Province(20110267)+1 种基金Research of New Antibiotics for Poplar Diseases & Science and Technology Research Plan of Forestry Department of Jilin Province(2014-004)Development of Forestry Microbial Agents & Key Projects for Science and Technology in Jilin Province(20150203015NY):Monitoring and Control Technology of Major Pests and Diseases in Industrial Forest
文摘[ Objective] The paper wag to improve the antimicrobial effect of antagonistic Streptomyces on Botryosphaeria dothidea. [ Method ] Different concentrations of DES were adopted for mutagenic treatment of antagonistic Streptomyces F-58. After fermentation, the mutant strain numbered F-58-06 with genetic stability and good antimicrobial effect was selected among 200 mutant strains; the biological activity of the strain was determined with B. dothidea as the indicator fungus, and the best concentration of DES wag 2%. The fermentation conditions of antagonistic substances of Streptomyces strain F-58-06 produced in shake flasks were opti- mized using the method of single factor and orthogonal experimental design. [ Result] The optimal fermentation conditions were carbon source corn flour, nitrogen source KNO3, initial pH 7, loading volume 30 mL in 250 mL shake flask, inoculation volume 3%, incubation time 132 h. Based on orthogonal experiments, the best cultured medium ratio was corn flour 4%, KNO3 0.5%, CaCO3 0.2%, NaCI 0.35%, MgSO4 · 7H2O 0. 15%. [ Conclusion ] After mutation and optimization of culture medium, the antimicrobial activity of Streptomyces F-58 was greatly improved, and the average inhibition zone diameter was 1.35 times of that of the original strain.
文摘【目的】明确中国陕南地区核桃树溃疡病成因。【方法】对陕西南部主要核桃产区的病害流行情况进行跟踪调查,从典型的枝干病灶组织中分离到了该病的致病菌,应用柯赫氏法则验证了该致病菌的致病性,同时根据形态学特征和ITS序列分析对病原菌进行鉴定,并利用BLAST软件将测序所得真菌ITS序列与NCBI(National Center for Biotechnology Information)数据库中已登录的序列进行同源序列比对,获得其分类地位,利用MEGA 5.0软件构建系统发育树。【结果】陕西南部核桃溃疡病的病原菌形态特征与葡萄座腔菌相符合,其ITS序列与已公布的葡萄座腔菌的ITS序列相似度为99.8%,系统发育树分析结果与之一致。【结论】陕西南部核桃溃疡病的病原菌为葡萄座腔菌(Botryosphaeria dothidea)。
