Fig. 4

Different effects of low and high salt stress on bacterial families. A The samples fell into two different group based on low and high salt stress by random forest analysis. B The top 20 bacterial phyla were identified by applying random forest classification of the relative abundance of the root bacterial under high and low salt stress. Biomarker taxa are ranked in descending order of importance to the accuracy of the model. The curve represents validation as a function of the number of input phyla used to differentiate high and low salt root bacteria in order of variable importance. C Phylum-level differences of bacterial between high salt and low salt concentrations in rhizosphere soils. D Different colored nodes represent the bacteria groups that were significantly enriched in the corresponding groups and had a significant influence on the differences between groups; light yellow nodes represent the bacteria groups that had no significant difference in different groups or no significant influence on the differences between groups (salt 0, salt 3, salt 5, and salt 7 represent rhizosphere soil under 0, 0.3, 0.5, and 0.7% salt concentration treatment, respectively). E COG function prediction of root bacteria in high salt and low salt rhizosphere soil