摘要
为探究拮抗放线菌ZZ-9(Streptomyces rochei)菌株发酵液的抑菌谱,并明确传代培养、温度、光照、pH及紫外线等理化因素对发酵液稳定性的影响。以15种植物病原真菌为供试菌,采用菌丝生长速率法测定发酵液的抑菌谱,并以苹果树腐烂病菌(Cytosporasp.)为指示菌,测定不同条件下发酵液的稳定性。抑菌谱结果表明:ZZ-9菌株发酵液对供试的15种病原真菌均具有不同程度的抑制作用,其中对苹果树腐烂病菌和立枯丝核菌抑制效果最好,生长抑制率可达96%以上,且效果持久;而对苹果轮纹病菌、蚕豆褐斑病菌、月季叶霉病菌等抑制效果较差,抑制率在27%以下。稳定性试验结果表明:菌株传接6代时,活性稳定,从第7代开始菌株活性下降显著;发酵液耐高温,对强酸强碱处理、可见光及紫外线照射均有较好的稳定性;且在4℃及室温(20~25℃)下可贮藏至少30d而保持其抑菌活性几乎不变。因此,拮抗放线菌ZZ-9菌株次生代谢产物具有较广谱的抑菌活性和较强的稳定性,具有开发成微生物农药的潜力。
To study bacteriostatic spectrum of fermentation broth from actinomycetes strain ZZ-9 identified as Streptomyces rochei,and to verify the effect of it on stability of fermentation broth under biochemical and physical factors such as subculture,temperature,illumination,pH and ultraviolet conditions.As the tested phytopathogen,method of growth rate was used to determine antimicrobial spectrum of fermentation broth with 15 kinds of plant pathogenic fungus.With Cytospora sp.as indicator phytopathogen,the stability of fermentation broth under different conditions was measured.The bacteriostatic spectrum results showed that the fermentation broth of ZZ-9 strain had inhibitory effects at different degres on 15 kinds of pathogenic fungus.With growth inhibition rate of more than 96％ and the lasting effect,the fermentation broth of ZZ-9 strain had the best effect on Cytospora sp.and Rhizoctonia solani,and it had worse effect on Botryosphaeria piricola,Cladosporium cladosporioidesv and Ascochyta fabae,the inhibition rate was under 27 ％.The stability test showed that the activity of strain was stable until the 6th generation,it decreased significantly from the 7th generation,and the fermentation broth had high temperature resistance,good stability under strong acid and alkali,visible light and ultraviolet irradiation treatments.Moreover,the fermentation broth could be stored for at least 30 days at 4 ℃ and room temperature （20-25 ℃）,the activity remained nearly unchanged.Therefore,the secondary metabolites of antagonistic actinomycetes ZZ-9 strain had broad-spectrum antibacterial activity and strong stability,and the potential could be developed into the microbial pesticide.
出处
《西北农业学报》
CAS
CSCD
北大核心
2017年第3期463-470,共8页
Acta Agriculturae Boreali-occidentalis Sinica
基金
甘肃省农牧厅农业生物技术研究与应用开发项目(GNSW-2012-27)
国家重点研发计划(2016YFD0201112)~~
关键词
拮抗放线菌
发酵液
抑菌谱
稳定性
Antagonistic actinomycetes
Fermentation broth
Antimicrobial spectrum
Stability
