致病性镰孢菌入侵对土壤微生物群落和功能的影响

Effects of Invasion of Pathogenic Fusarium on Soil Microbial Community and Function

为了解致病性镰孢菌入侵对土壤微生物群落和功能的影响,本研究通过宏基因组测序分析了致病性镰孢菌入侵模型的微生物群落组成和功能特征。结果表明,尖镰孢菌入侵引起了慢生根瘤菌属(Bradyrhizobium)和链霉菌属(Streptomyces)等土壤原著优势微生物种群的相对丰度降低,变形菌门(Proteobacteria)、放线菌门(Actinobacteria)、芽单胞菌门(Gemmatimonadetes)和子囊菌门(Ascomycetes)等门下稀有微生物属的相对丰度上升。同时,在尖镰孢菌入侵土壤中,与固氮作用、硝化作用和反硝化作用等养分循环功能相关基因丰度发生明显变化。研究结果表明,尖镰孢菌可通过改变链霉菌属和慢生根瘤菌属等土壤优势微生物的群落多样性,创造更有利于自身生存的环境。

In order to understand the effect of pathogenic Fusarium on soil microbial community and function, the microbial community composition and function characteristics in the invasion model of pathogenic Fusarium were analyzed by metagenomic technology in this study. The results showed that F. oxysporum significantly decreased the relative abundance of dominant microorganisms such as Bradyrhizobium and Streptomyces, while increased the relative abundance of non-dominant microorganisms in Proteobacteria, Actinobacteria, Gemmatimonadetes and Ascomycetes. At the same time, the abundance of functional genes related to nutrient cycling and resistance such as nitrogen fixation, nitrification and denitrification significantly changed in the soil invaded by F. oxysporum. In conclusion, F. oxysporum could change the community diversity of dominant microorganisms in soil, such as Streptomyces and Bradyrhizobium, to create a more beneficial environment for its own survival.