荒漠植物根际土壤核心细菌群落及其功能研究OA

To decipher the rhizosphere microbial resources and their ecological functions in desert plants,this study focused on five typical desert plant species in the sandy grassland of the Ordos Plateau:Allium bidentatum,Hedysarum mongolicum,Lycium chinense,Oxytropis aciphylla,and Fructus hippophae.Third-generation high-throughput sequencing of full-length 16S rRNA genes was performed on rhizosphere soil bacteria,combined with bioinformatics analysis to reveal community characteristics and functional divergence.It was found that Proteobacteria,Actinobacteria,and Bacteroidetes were the dominant phyla shared across all plant species.Within Actinobacteria,genera Paenarthrobacter,Arthrobacter,and Pseudarthrobacter exhibited high connectivity in the co-occurrence network,forming the core microbial community.The L.chinense rhizosphere displayed a unique community structure,with significantly higher relative abundance of Chloroflexi compared to other plant species(P＜0.05),and enrichment of specific biomarkers such as Longimicrobium.Functional prediction indicated that the rhizosphere microbiota of F.hippophae had the highest abundance of carbon fixation pathways(e.g.,one-carbon pool by folate),while L.chinense uniquely enriched the fatty acid elongation pathways.Soil physicochemical analysis identified organic matter and available phosphorus as key drivers of bacterial community divergence in the L.chinense rhizosphere,whereas pH primarily shaped the communities of F.hippophae,O.aciphylla,and A.bidentatum.In summary,the findings reveal that desert plants recruit stress-resistant functional microbes to their rhizosphere through selective enrichment of core genera like Pseudarthrobacter,thus providing insight and theoretical support for microbial-mediated restoration of desert ecosystems.