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四川海螺沟冰川土样芽胞杆菌资源分析
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国家自然科学基金(31370059);福建省自然科学基金(2016J01129);福建省农业科学院PI项目(2016PI-43);福建省农业科学院青年英才计划(YC2015-17);福建省农业科学院科技创新团队(STIT2017-1-11)


Isolation and identification of Bacillus-like species from glacier soil samples collected from Hailuogou in Sichuan Province
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    摘要:

    【背景】芽胞杆菌(Bacillus-like)是一类能形成具有强抗性芽胞且可在多种极端环境下存活的细菌,其产生的多种功能代谢产物在多种领域具有重要研究价值。由于冰川低温、寡营养的独特生态环境,其存在的芽胞杆菌可能具有特殊性,因此研究冰川芽胞杆菌有利于发掘新基因、丰富芽胞杆菌多样性。【目的】了解四川海螺沟冰川土壤芽胞杆菌资源,为挖掘芽胞杆菌新资源提供基础。【方法】采用纯培养法分离获得冰川土壤芽胞杆菌资源,利用16S rRNA基因进行系统发育分析,测定代表性菌株的生理生化特性并采用类平均法和欧氏距离模型进行聚类分析。【结果】共筛选到可培养细菌44株,经16S rRNA基因鉴定确定其中36株为芽胞杆菌,隶属于4个属的19个种,分别为芽胞杆菌属(Bacillus) 11个种24株、类芽胞杆菌属(Paenibacillus) 2个种3株、短芽胞杆菌属(Brevibacillus) 4个种5株和赖氨酸芽胞杆菌属(Lysinibacillus) 2个种4株,其中以芽胞杆菌属(Bacillus)为优势属。分离菌中仅3株芽胞杆菌可在4 °C生存,7株能在50 °C生长,大部分菌株在30 °C下生长良好;有74%菌株能耐碱,有37%菌株能在无盐条件下生长。根据生理生化结果,采用类平均法和欧氏距离模型进行聚类分析,可分为3组,分别包含7种、4种和6种芽胞杆菌。第1组均可以水解七叶灵和利用葡萄糖,第2组均不能水解七叶灵和利用葡萄糖,第3组仅能共同利用葡萄糖。【结论】四川海螺沟冰川土壤蕴藏着较为丰富的芽胞杆菌资源,为芽胞杆菌新资源挖掘提供了资源保障。

    Abstract:

    [Background] Bacillus-like bacteria can form endospores with strong resistance and thus, can survive in a variety of extreme environments. Their multiple metabolic products make them have important research value in many fields. Because glacier has the low temperature and oligotrophic unique environment, Bacillus-like bacteria in this environment would be specific, which could be expected to enrich the Bacillus-like resources and discover new functional genes. [Objective] The aim of this study is to understand the diversity of the Bacillus-like resources in the Hailuogou glacier, Sichuan Province, providing a foundation for mining new Bacillus-like resources. [Methods] Bacillus-like strains were isolated by the culture-dependent method and identified using 16S rRNA gene sequence. Subsequently, physiological-biochemical characteristics of the typical strains selected were determined and further performed cluster analysis by the group-average method with the Euclidean distance model. [Results] In total, 44 strains were obtained and 36 strains belonged to Bacillus-like bacteria. The 16S rRNA gene phylogenetic analysis showed that they could be assigned to 19 species within 4 genera including Bacillus (11 species 24 strains), Paenibacillus (2 species 3 strains), Brevibacillus (4 species 5 strains) and Lysinibacillus (2 species 4 strains). Thus, the genus Bacillus was dominant. The physiological-biochemical characteristics showed that: i) only 3 strains could survive at 4 °C, 7 strains could grow at 50 °C, whereas most strains could grow well at 30 °C; ii) 74% of the Bacillus-like strains had alkali resistance; and iii) 37% of them could grow without NaCl. According to the physiological and biochemical results, those strains could be divided into 3 groups by cluster analysis using the group average method and Euclidean distance models. The first group could hydrolyze esculin and utilize glucose. The second groups could not hydrolyze esculin and utilize glucose, and the third group could only utilize glucose. [Conclusion] Hailuogou glacier soil is rich in the Bacillus-like resources, providing a basis for the mining of them.

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刘琴英,刘国红,王阶平,车建美,陈倩倩,刘波. 四川海螺沟冰川土样芽胞杆菌资源分析[J]. 微生物学通报, 2018, 45(6): 1237-1249

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  • 在线发布日期: 2018-06-05
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