文章摘要
贝莱斯芽孢杆菌LF01基因组序列分析及其代谢产物的生防作用
Genomic analysis of Bacillus velezensis LF01 strain and the biocontrol effect of its secondary metabolites
投稿时间:2020-10-15  修订日期:2020-11-30
DOI:
中文关键词: 贝莱斯芽孢杆菌,基因组测序,拮抗物质,生防作用
英文关键词: Bacillus velezensis  genome sequencing  antagonistic substances  biocontrol effect
基金项目:现代农业产业技术体系(CARS-45);中国水产科学研究院中央级公益性科研院所基本科研业务费专项资金(2019XN-003);广东省促进经济发展专项(现代渔业发展用途)项目(粤农2019B8)
作者单位邮编
张德锋 中国水产科学研究院珠江水产研究所 510380
高艳侠 中国水产科学研究院珠江水产研究所 
可小丽 中国水产科学研究院珠江水产研究所 
王亚军 中国水产科学研究院珠江水产研究所 
任燕 中国水产科学研究院珠江水产研究所 
石存斌 中国水产科学研究院珠江水产研究所 510380
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中文摘要:
      为充分挖掘贝莱斯芽孢杆菌 LF01菌株拮抗物质合成相关基因簇,本研究对其进行了全基因组测序与分析,同时,评价了LF01菌株拮抗物质的生物安全性及其生防作用效果。基于三代Nanopore测序平台对LF01菌株进行全基因组测序分析,并利用在线ANI和DDH分析以及基因组遗传进化确定该菌株的分类学地位;通过antiSMASH在线分析LF01基因组中的拮抗物质合成基因簇。同时,基于CAZyme数据库分析LF01菌株对糖类物质的水解能力。LF01菌株拮抗物质通过腹腔注射的方式,评价其对尼罗罗非鱼尼罗罗非鱼 和斑马鱼的致病性;拮抗物质饲喂尼罗罗非鱼并评价其生防作用效果。结果显示,LF01菌株基因组全长为3 974 023 bp,GC含量为46.56%,包含3 843个编码基因。LF01菌株与贝莱斯芽孢杆菌的ANI和DDH分别≥97.66%和≥80.10%,同时基于SNP进化分析显示,该菌与贝莱斯芽孢杆菌聚为一枝支,表明LF01菌株在基因组分子水平上被鉴定贝莱斯芽孢杆菌。LF01菌株包含了bacillaene、bacillibactin、杆菌霉素D(bacillomycin D)、溶杆菌素(bacilysin)、difficidin、泛革素(fengycin)、macrolactin H、plantazolicin和表面活性素(surfactin) 等9个拮抗物质基因簇,约占基因组全长的8.83%。LF01菌株基因组中含有许多与纤维素、半纤维素、淀粉、几丁质、果胶、肽聚糖和葡聚糖降解有关的CAZy酶基因家族。LF01的拮抗物质对尼罗罗非鱼和斑马鱼具有较高的安全性,而且饲喂尼罗罗非鱼后能够显著提高其对无乳链球菌的抗病力。综上可知,LF01菌株含有大量拮抗物质合成基因簇,其拮抗物质具有较高的生物安全性,并且饲喂后能够显著提高尼罗罗非鱼的抗病力,表明LF01菌株拮抗物质用于水产动物细菌病的防控具有良好的开发应用前景。
英文摘要:
      The aims of this study are to explore the gene clusters related to antagonistic substances of Bacillus velezensis LF01 strain based on the whole genome sequencing, and to evaluate the biological safety and biocontrol effect of the antagonistic substances of the LF01 strain. In this study, the whole genome of the LF01 strain was sequenced based on the third generation Nanopore sequencing platform, and its taxonomic status was identified based on ANI and DDH online analysis, and the genetic evolution at genome level. The gene clusters related to antagonistic substances of the LF01 strain was analyzed based on antiSMASH software. The hydrolysis activity of the LF01 strain to carbohydrate was analyzed based on CAZyme database. The toxicity of the antagonistic substances of LF01 strain to Oreochromis niloticustilapia and Danio reriozebrafish was evaluated by intraperitoneal injection. The biocontrol effect of the antagonistic substances of LF01 strain to O. niloticustilapia was evaluated by artificial infection after 5 d of feeding O. niloticustilapia. The complete genome of LF01 strain was a total length of 3974023 bp and the GC content was 46.56%, and it contains 3843 coding genes. Compared to B. velezensis, the ANI and DDH values of LF01 strain were ≥97.66% and ≥80.10%, respectively. Furthermore, the genomic evolution analysis showed that LF01 strain was clustered with B. velezensis. These results indicated that LF01 strain was identified as B. velezensis at the genomic level. The LF01 strain contains nine gene clusters related to antagonistic substances, including bacillaene, 、 bacillibactin、, bacillomycin D、, bacilysin、, difficidin、, fengycin、, macrolactin H、, plantazolicin and surfactin, which accounts for 8.83% of the total genome sequences. In addition, LF01 strain contains a large number of CAZymes related to the degradation of cellulose, hemicellulose, starch, chitin, pectin, peptidoglycan and glucan. The antagonistic substances of the LF01 strain showed high biological safety to O. niloticustilapia and D. reriozebrafish, and they were significantly enhanced the resistance of O. niloticustilapia against S. agalactiae infection (P<0.01). In conclusion, the LF01 strain contains a large number of gene clusters for biosynthesis of secondary metabolites related to antagonistic substances. The antagonistic substances were found to be safe for O. niloticustilapia and D. reriozebrafish, and feeding O. niloticustilapia with them significantly improved the diseases resistance of fish. Therefore, the antagonistic substances of LF01 strain have a broad development and application prospect as biocontrol agents to improve bacteria diseases control in aquaculture.
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