不经培养的农田土壤微生物种群构成及系统分类的初步研究

Community Constitute and phylogenetic Analysis on Soil Uncultured Microorganism

采用一系列的现代分子生物学技术 ,避开传统的分离培养过程 ,探讨自然界中微生物种群的基因多样性。经过直接从土壤中抽提总DNA ,并对总DNA中 1 6SrDNAV3可变区序列作PCR扩增、变性梯度凝胶电泳等 ,对农田土壤微生物种类分布进行初步的研究 ,发现不同的农田土壤间的菌种差异相当显著 ,同时对部分农田微生物的系统分类作了初步尝试 。

Many evidences show bachteria that can be cultured in lab are only the minority of germs existing in nature. Most of bacteria, containing rich valuable gene resource, are unknown for they are uncultured. To research these uncultured bacteria, Directly extract crude DNA from farm soil, separate 16S rDNA mixture amplified by PCR from the crude DNA, sequence it and compare the sequences with the records of NCBI to classify the germs. The significant microbe community difference from respective soil, which have possibility in developing a new tool for researching soil bacteria diversity were finded.