摘要
用对峙生长法从422株红树内生细菌中筛选到1株对青枯雷尔氏菌(Ralstonia solanacea-rum)、金黄色葡萄球菌(Staphylococcus aureus)、溶藻弧菌(Vibrio alginolyticus)、辣椒疫霉菌(Phytophthora capsici)、香蕉枯萎病菌(Fusarium oxysporum f.sp.cubense)等动植物病原细菌和真菌均具有较强的拮抗作用的海洋细菌CⅢ-1菌株,经形态和生理生化特性及16S rRNA序列分析,鉴定该菌株为解淀粉芽孢杆菌(Bacillus amyloliquefaciens)。用33%硫酸铵从菌株的培养滤液中盐析获得对供试病原菌均具有较强拮抗作用的抗菌活性蛋白,性质测定发现,该抗菌活性蛋白对热不稳定,60°C和100°C下处理10min,其抗菌活性分别下降了62.5%和完全丧失,在pH5.0?10.0范围内均具有抑菌作用,以pH7.0时抗菌活性最强。
The CⅢ-1 strain, a marine bacterium screened out from 422 endophytic bacteria isolated from mangroves by the method of plate test, strongly inhibited the growth of Ralstonia solanacearum, Staphylococcus aureus, Vibrio alginolyticus, Phytophthora capsici, Fusariurn oxysporurn f. sp. cubense, etc.. It was identified as Bacillus amyloliquefaciens based on the characters of morphology, physiology and biochemistry and 16S rRNA. Antimicrobial protein which produced by CIII-1 was the main antibacterial substance. The crude protein in culture filtrate could be precipitated with 33% ammonium sulfate and obtained by dialysis of the precipitate. The protein was found to be thermal-unstable, when treated at 60℃ and 100℃ for 10 minutes, its inhibitive activity would 10st 62.5% and 100% respectively. The inhibitory activity of the protein was observed in the range ofpH value from 5.0 to 10.0, and the strongest one was at pH 7.0.
出处
《微生物学通报》
CAS
CSCD
北大核心
2010年第2期222-227,共6页
Microbiology China
基金
广东省科技计划项目(No.2009B020310015,2009B030803055)
关键词
红树
内生细菌
鉴定
抗菌蛋白
分离
Mangrove, Endophytic marine bacteria, Identification, Antimicrobial protein, Isolation
