甲原菌的固,文献审查和基于DNA数据库的分析;面对气候变化的重要性
Zubia Riyaz1, Shams Tabrez Khan2
1Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh, Uttar Pradesh, 202002, India.
Archives of microbiology
|November 29, 2024
概括
古生物,经常被忽视的土壤微生物,拥有生物固定的基因 (BNF). 这项研究确定了37种能够产生BNF的古生物,突出了它们在气候变化压力下的循环中的潜在作用.
科学领域:
- 微生物生态学 微生物生态学
- 生物化学 生物化学
- 遗传学 遗传学 是一个
背景情况:
- 菌构成土壤微生物群落的高达10%,但它们的功能,包括生物固定 (BNF),往往被低估.
- BNF对于循环至关重要,在不断变化的环境条件下,Archaea执行它的能力可能是至关重要的.
- 有限的综合数据存在于Archaea中的BNF,特别是关于对气候变化引起的环境压力的反应.
研究的目的:
- 调查生物固定 (BNF) 在Archaea的流行和遗传基础.
- 识别具有BNF基因的特定考古血统,并评估它们的进化关系.
- 探索在环境压力下的土壤生态系统中考古BNF的潜在意义.
主要方法:
- 进行了全面的文献和DNA数据库调查,以确定具有固能力的古生物.
- 分析了不同考古群体中酶基因 (nif基因) 的遗传排列和相似性.
- 利用nifHDK基因相似性矩阵推断与细菌固剂的进化联系.
主要成果:
- 确定了37种古生物,包括甲基生物和ANME2系,具有BNF的基因或已知可以固定大气N2.
- 观察到古老的nif基因通常在单个操作子内的集群中排列,编码Mo-nitrogenase,有时是替代金属基酶 (vnf).
- 在Archaea和无氧细菌Clostridium beijerinckii之间发现了最高的nifHDK基因相似性,支持横向基因转移理论.
结论:
- 考古物为BNF提供了遗传机械,这对土壤循环有潜在的影响.
- 尼夫基因的遗传组织和相似性表明BNF的古代起源,可能从细菌转移到古物.
- 鉴于Archaea对极端条件的适应性,进一步研究它们的BNF作用,特别是在环境压力下是有必要的.
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