File Name : figure_s1.1.docx

Caption : fig. s1 the score scatter plot of the pca model for (a) hn+dpep vs. fn. (b) hn+dpep vs. hn. the x-axis pc [1] and y-axis pc [2] represent the scores of the first and second principal components, respectively. the score scatter plot of the opls-da model for (c) hn+dpep vs. fn. (d) hn+dpep vs. hn. the x-axis t [1] p represents the predicted principal component score of the first principal component, while the y-axis t [1] o represents the orthogonal principal component score. the permutation test of the opls-da model for (e) hn+dpep vs. fn. (f) hn+dpep vs. hn. the x-axis represents the retention of the permutation test, while the y-axis represents the r2y or q2 values. the two dashed lines represent the regression lines of r2y and q2, respectively. fn, mrs (deman, rogosa, sharpe) medium; hn, mrs medium without half nitrogen source; hn+dpep, hn supplemented digested soybean peptides.

File Name : figure_s2.1.docx

Caption : fig. s2 a volcano plot of differential metabolites for (a) hn+dpep vs. fn. (b) hn+dpep vs. hn. each point represents a metabolite, while the x-axis represents multiple changes in each substance in the group. the y-axis represents the p-value of the student's t-test, while the size of the scatter represents the vip value of the opls-da model. red dots indicate up-regulated metabolites with significant differences (p < 0.05, vip > 1), blue dots indicate down-regulated metabolites with significant differences (p < 0.05, vip > 1), and gray dots indicate different metabolites with no significant differences (p > 0.05 or vip < 1). fn, mrs (deman, rogosa, sharpe) medium; hn, mrs medium without half nitrogen source; hn+dpep, hn supplemented digested soybean peptides.

File Name : figure_s3.1.docx

Caption : fig. s3 the pathway analysis for (a) hn+dpep vs. fn. (b) hn+dpep vs. hn. each bubble represents a metabolic pathway. the x-axis and bubble size represent the size of the influencing factor of the pathway during the topological analysis, while the y-axis and bubble color represent the p-value of the enrichment analysis. fn, mrs (deman, rogosa, sharpe) medium; hn, mrs medium without half nitrogen source; hn+dpep, hn supplemented digested soybean peptides.