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Application of Bacillus thuringiensis strains with conjugal and mobilizing capability drives gene transmissibility within Bacillus cereus group populations in confined habitats
BMC Microbiology ( IF 4.2 ) Pub Date : 2020-11-26 , DOI: 10.1186/s12866-020-02047-4
Xiaomin Hu 1 , Doudou Huang 2 , Joseph Ogalo 2 , Peiling Geng 2 , Zhiming Yuan 2 , Hairong Xiong 1 , Xiaofu Wan 2 , Jiahui Sun 2
Affiliation  

Bacillus thuringiensis bacteria share similar genetic, physiological, and biochemical characteristics with other members of the Bacillus cereus group. Their diversity and entomopathogenic origin are related to their mobile genetic elements. However, the effects of wide-spread application of B. thuringiensis-based pesticides on genetically related B. cereus group populations present in the environment remain poorly understood. We first identified pBMB76 from B. thuringiensis tenebrionis as a new conjugative plasmid. Mixed mating experiments suggested that pBMB76 may compete with pHT73, another known conjugative plasmid. Applications of single (tenebrionis 4AA1 and kurstaki HD73 carrying pBMB76 and pHT73, respectively) and mixed (4AA1 + HD73) B. thuringiensis strains were performed in confined plot habitats (soil and leaf) over two planting seasons. In total, 684 B. cereus group isolates were randomly selected from different treatment sets, and the transmissibility and occurrence rate of potential conjugative plasmids were surveyed. Results showed that the percentage of isolates with plasmid mobility was markedly enhanced in the B. thuringiensis-sprayed groups. Furthermore, we performed multi-locus sequence typing (MLST) for a subset of 291 isolates, which indicated that the dominant sequence types in the treated habitats were identical or related to the corresponding sprayed formulations. The application of B. thuringiensis strains with conjugal and mobilizing capability drove gene transmissibility within the B. cereus group populations in confined habitats and potentially modified the population structure.

中文翻译:

具有接合和动员能力的苏云金芽孢杆菌菌株的应用在有限栖息地的蜡样芽孢杆菌种群中驱动基因传播

苏云金芽孢杆菌细菌与蜡样芽孢杆菌组的其他成员具有相似的遗传、生理和生化特征。它们的多样性和昆虫病原起源与其可移动的遗传元件有关。然而,对环境中存在的与遗传相关的蜡状芽孢杆菌种群的广泛应用基于苏云金芽孢杆菌的杀虫剂的影响仍然知之甚少。我们首先从 B. thuringiensis tenebrionis 中鉴定出 pBMB76 作为一种新的接合质粒。混合交配实验表明 pBMB76 可能与另一种已知的接合质粒 pHT73 竞争。单株(分别携带 pBMB76 和 pHT73 的 tenebrionis 4AA1 和 kurstaki HD73)和混合(4AA1 + HD73)苏云金芽孢杆菌菌株在两个种植季节在密闭的地块栖息地(土壤和叶)中进行应用。从不同处理组中随机抽取684株蜡状芽孢杆菌,对潜在结合质粒的传播率和发生率进行了调查。结果表明,在苏云金芽孢杆菌喷洒组中,具有质粒迁移率的分离株百分比显着提高。此外,我们对 291 个分离株的子集进行了多位点序列分型 (MLST),这表明处理过的栖息地中的主要序列类型与相应的喷洒制剂相同或相关。具有接合和动员能力的苏云金芽孢杆菌菌株的应用推动了封闭栖息地中蜡状芽孢杆菌种群内的基因传播,并可能改变了种群结构。从不同处理组中随机选取蜡样菌群分离株,考察潜在结合质粒的传播率和发生率。结果表明,在苏云金芽孢杆菌喷洒组中,具有质粒迁移率的分离株百分比显着提高。此外,我们对 291 个分离株的子集进行了多位点序列分型 (MLST),这表明处理过的栖息地中的主要序列类型与相应的喷洒制剂相同或相关。具有接合和动员能力的苏云金芽孢杆菌菌株的应用推动了封闭栖息地中蜡状芽孢杆菌种群内的基因传播,并可能改变了种群结构。从不同处理组中随机选取蜡样菌群分离株,考察潜在结合质粒的传播率和发生率。结果表明,在苏云金芽孢杆菌喷洒组中,具有质粒迁移率的分离株百分比显着提高。此外,我们对 291 个分离株的子集进行了多位点序列分型 (MLST),这表明处理过的栖息地中的主要序列类型与相应的喷洒制剂相同或相关。具有接合和动员能力的苏云金芽孢杆菌菌株的应用推动了封闭栖息地中蜡状芽孢杆菌种群内的基因传播,并可能改变了种群结构。结果表明,在苏云金芽孢杆菌喷洒组中,具有质粒迁移率的分离株百分比显着提高。此外,我们对 291 个分离株的子集进行了多位点序列分型 (MLST),这表明处理过的栖息地中的主要序列类型与相应的喷洒制剂相同或相关。具有接合和动员能力的苏云金芽孢杆菌菌株的应用推动了封闭栖息地中蜡状芽孢杆菌种群内的基因传播,并可能改变了种群结构。结果表明,在苏云金芽孢杆菌喷洒组中,具有质粒迁移率的分离株百分比显着提高。此外,我们对 291 个分离株的子集进行了多位点序列分型 (MLST),这表明处理过的栖息地中的主要序列类型与相应的喷洒制剂相同或相关。具有接合和动员能力的苏云金芽孢杆菌菌株的应用推动了封闭栖息地中蜡状芽孢杆菌种群内的基因传播,并可能改变了种群结构。这表明处理过的栖息地中的主要序列类型与相应的喷洒制剂相同或相关。具有接合和动员能力的苏云金芽孢杆菌菌株的应用推动了封闭栖息地中蜡状芽孢杆菌种群内的基因传播,并可能改变了种群结构。这表明处理过的栖息地中的主要序列类型与相应的喷洒制剂相同或相关。具有接合和动员能力的苏云金芽孢杆菌菌株的应用推动了封闭栖息地中蜡状芽孢杆菌种群内的基因传播,并可能改变了种群结构。
更新日期:2020-11-27
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