烟草青枯病抑病型土壤中有益微生物的组成分析

为挖掘烟草青枯病抑病型土壤有益微生物资源,通过大田试验分析了不同海拔高度抑病型和导病型土壤的微生物群落结构以及青枯菌、拮抗菌等的相对丰度.结果表明,与导病型土壤相比,烟草青枯病抑病型土壤中有益细菌门放线菌门(Actinobacteria)、厚壁菌门(Firmicutes)、蓝藻门(Cyanobacteria)和有益真菌...

Composition analysis of beneficial microorganisms in disease-suppressive soils against tobacco bacterial wilt

In order to explore the beneficial microbial resources for disease-suppressive soils against tobacco bacterial wilt, field experiments were conducted to analyze the microbial community structure and the relative abundances of Ralstonia solanacearum and antagonistic bacteria in disease-suppressive soils and disease-conducive soils at different altitudes. The results showed that at phylum level, the relative abundances of beneficial bacteria (Actinobacteria, Firmicutes, Cyanobacteria) and beneficial fungi (Zygomycota, Chytridiomycota) in disease-suppressive soils were higher than those in disease-conducive soils. At genus level, the relative abundances of some beneficial microorganisms (Mesorhizobium, Nitrosospira) and antagonistic microorganisms (Pseudomonas, Flavobacterium, Rhizobium, Aspergillus, Trichoderma, Myrothecium) in disease-suppressive soils were significantly higher than those in disease-conducive soils, which all had obviously negative correlations with the incidence of bacterial wilt. However, the relative abundance of pathogenic microorganism (Ralstonia) in disease-suppressive soils was significantly lower than that in disease-conducive soils. To sum up, there were abundant antagonistic microorganisms in disease-suppressive soils against tobacco bacterial wilt.