Analysis of RhizosphereMicrobial Community Characteristics of Dominant Plants in Decommissioned Uranium Mine.

In order to study the relationships among rhizosphere microbial community, soil physicochemical properties, radioactivity and associated pollution, the rhizosphere soils of 7 dominant plants were collected from a decommissioned uranium mine. The soil physicochemical property analysis, Illumina high-throughput sequencing and redundancy analysis (RDA) were carried out. The results showed that the contents of arsenic, lead, cadmium, zinc and uranium in rhizosphere soil of most dominant plants were higher than the local background values. The top 10 bacterial phya in rhizosphere soil were Acidobacteriota, Actinobacteriota, Proteobacteria, unidentified_Bacteria and Crenarchaeota, Chloroflexi, Firmicutes, Verrucomicrobiota, Bacteroidota, unidentifiedϣArchaea, with a total relative abundance 80.9%-89.0%. The top 10 fungi phyla were Mortierellomycota, Ascomycota, Basidiomycota, Mucoromycota, Chytridiomycota, Glomeromycota, Rozellomycota, Blastocladiomycota, Olpidiomycota, and Monoblepharomycota, with a total relative abundance 82.4%-96.5%. The growth of dominant plants improved the biodiversity of soil microorganisms, and specific microbial genera were enriched in the rhizosphere soil of certain plants. RDA analysis showed that chromium, arsenic and lead were the main driving factors affecting the dominant rhizosphere microbial community structure. The growth of dominant plants in mining areas increased the diversity of soil microorganisms and formed special symbionts with rhizosphere microorganisms to adapt to pollution. This study shows that symbionts composed of dominant plants and recruited microorganisms in contaminated areas have potential application in bioreremediation in the future. This study laid a theoretical foundation for the screening of biomaterials for plant-microbial combined remediation in the later stage. [ABSTRACT FROM AUTHOR]