Molecular genetic diversity of bacte【优秀3篇】

Molecular genetic diversity of bacteria in environmental samples

Molecular genetic diversity refers to the variation in genetic material among individuals or populations of a species. In the case of bacteria, understanding their genetic diversity is crucial for several reasons, including identifying new species, studying their evolution, and assessing their role in various ecological processes. In this article, we will explore the molecular genetic diversity of bacteria in environmental samples and its significance in understanding microbial ecosystems.

Environmental samples, such as soil, water, and air, are rich sources of microbial diversity. Bacteria in these samples play important roles in nutrient cycling, decomposition, and other essential ecological processes. Traditional methods of studying bacterial diversity, such as culturing and microscopy, are limited in their ability to capture the full extent of microbial diversity. Molecular techniques, on the other hand, allow for a more comprehensive and accurate assessment of bacterial populations in environmental samples.

One commonly used molecular technique for studying bacterial diversity is DNA sequencing. By sequencing specific regions of the bacterial genome, researchers can identify and compare the genetic makeup of different bacterial species. This information can then be used to construct phylogenetic trees, which depict the evolutionary relationships between different bacterial taxa. By analyzing the genetic diversity within and between bacterial populations, researchers can gain insights into the evolutionary history and ecological roles of different bacterial species.

Metagenomics is another powerful tool for studying bacterial diversity in environmental samples. Metagenomics involves sequencing the total DNA extracted from a sample, allowing for the identification and characterization of all the microorganisms present in that sample. This approach not only provides information about the diversity of bacterial species but also allows for the functional analysis of their genes and metabolic pathways. By studying the genetic potential of bacterial populations in environmental samples, researchers can gain insights into their ecological functions and their potential for biotechnological applications.

The study of molecular genetic diversity of bacteria in environmental samples has led to several important discoveries. For example, researchers have identified numerous novel bacterial species and revealed previously unknown microbial ecosystems, such as deep-sea hydrothermal vents and extreme environments like deserts and hot springs. These findings have expanded our understanding of the diversity and adaptability of bacteria and their potential roles in various ecological processes.

In conclusion, the molecular genetic diversity of bacteria in environmental samples is a fascinating field of research with significant implications for our understanding of microbial ecosystems. Molecular techniques, such as DNA sequencing and metagenomics, have revolutionized our ability to study bacterial diversity and have led to important discoveries in the field. By unraveling the genetic diversity of bacteria, we can gain insights into their evolutionary history, ecological functions, and potential applications in biotechnology.

Molecular genetic diversity of bacte 篇三

Molecular genetic persity of bacteria in the bottom section of arctic sea ice from the Canada Basin

PCR-DGGE approach was used to analyze bacterial persity in the bottom section of seven arctic

sea ice samples colleted from the Canada Basin. Thirty-two 16S rDNA sequences were obtained from prominent DGGE bands. The closest relatives of these sequences are found to be those of cultivated or uncultured bacteria from antarctic or arctic sea ice. Phylogenetic analysis clustered these sequences or phylotypes within α- proteobacteria, γ-proteobacteria and CFB (cytophaga-flexibacter-bacteroides) group. Sequences belonging to γ-proteobacteria were dominant and members of the CFB group were highly abundant. It was suggested that the CFB group was the representative of the bottom section of sea ice samples.

作 者： LI Huirong YU Yong CHEN Bo ZENG Yinxin REN Daming 作者单位： LI Huirong,YU Yong,CHEN Bo,ZENG Yinxin(State Oceanic Administration Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China)

REN Daming(State Key Laboratory of Genetic Engineering, Institute of Genetics, Fudan University, Shanghai 200433, China)

刊 名：海洋学报(英文版) SCI 英文刊名： ACTA OCEANOLOGICA SINICA 年，卷(期)： 200524(6) 分类号： P7 关键词： sea ice Arctic Ocean bacteria 16S rDNA phylogenetic analysis