The response of sugar beet rhizosphere micro-ecological environment to continuous cropping

Abstract Background and aims Continuous cropping can lead to increased soil-borne diseases of sugar beet and cause economic losses. We aimed to study the relationship of continuous cropping to the microbial community of each root compartment of sugar beet (Beta vulgaris L.). Methods The structure and difference of microbiome community in bulk soil (Sc and Sn), rhizosphere soil (Rc and Rn), and endosphere (Bc and Bn) of sugar beet were analyzed by high-throughput sequencing technique. Results The endophytic microbial alpha diversity of the root system was significantly lower in the continuous crop group than in the non-continuous crop group. The relative abundance of Proteobacteria increased and the relative abundance of Actinomycetes decreased in continuous cropping compared to non-continuous cropping. The relative abundance of Tausonia and Fusarium in each group of continuous cropping is greater than the non-continuous cropping. Microbial communities in all three root compartments were correlated with environmental factors, except for the rhizosphere bacterial community. Root compartments in continuous cropping are dominated by pathogenic fungi. The structural characteristics of the fungal zone show a continuous and progressive change from the bulk soil to the rhizosphere soil and then to the endosphere of sugar beet.Conclusions The accumulation or subtraction of some microbial populations during continuous sugar beet cultivation to form a specific flora has proven to be an important strategy for building the micro-ecological community structure of sugar beet. This provides a scientific reference for understanding the formation of continuous cropping obstacles in sugar beet.