摘要
通过组织分离法,在不同健康果树的木质部中分离到235株内生细菌。通过平板对峙法对所得菌株进行了初筛和复筛,得到6株拮抗作用较强的菌株。用过滤和高温灭菌得到的菌株发酵液进行抑菌谱试验,最终获得拮抗作用较强的内生细菌X8。对X8菌株在植物体内定殖、分类鉴定和防治作用的深入研究。结果表明:X8菌株可以在杏、辣椒等植物中定殖。X8菌株发酵液对辣椒疫霉病菌(Phytophthora capsici)抑制作用最强,达80.3%,对3种链格孢菌(Alternaria)病原菌的抑制作用达到75%以上,对番茄灰霉病和辣椒疫病的防效达到75.4%和79.3%,显著高于50%腐霉利和25%甲霜灵的防效。经16S rDNA序列分析,X8菌株与枯草芽孢杆菌Bacillus subtilis的16S rDNA序列的同源性达99%。综合形态特征、生理生化特性,最终将X8鉴定为B.subtilis,在GenBank中序列登录号为HQ647257。
Two hundred and thirty-five endophytic bacteria were isolated from the xylem from diverse healthy fruit trees with tissue isolation method. Through the primary and secondary screening with confront-culture method, six antagonistic strains were obtained. Antibacterial spectrum tests were performed with bacteria fermentation broth get by autoclaving and filtration. Ultimately, fermentation broth from strain X8 was found to have high antifungal activities. So strain X8 was further studied on colonization, identification and control. The results showed that: Strain X8 could colonize in apricots, peppers, and so on. The inhibition of fermentation broth from strain X8 was the strongest against Phytophthora capsici, up to 80.3% Which was .above 75% against three Alternaria pathogens. The controleffect of X8 fermentation broth to tomato gray mould and pepper phytophthora blight reached 75.4% and 79.3%, which were significantly higher than those of 50% procymidone and 25% metalaxyl. With the 16S rDNA sequence analysis, strain X8 shared 99% homology with Bacillus subtilis. According to morphology, physiological and biochemical characters as well as 16S rDNA sequences, strain X8 was identified as B. subtilis ( GenBank accession number HQ647257) .
出处
《园艺学报》
CAS
CSCD
北大核心
2014年第2期335-342,共8页
Acta Horticulturae Sinica
基金
国家自然科学基金项目(31171892)
山西省留学基金项目(2011-52)
山西省科技攻关项目(20100311038
20110311013-1)
山西省财政支持农业科技成果转化资金项目(SCZZNCGZH201304)
关键词
果树
内生细菌
分离
筛选
菌株鉴定
抑制作用
fruit tree
endophytes
isolation
screening
strain identification
inhibition