Figure 3. Volcano plots of significant changes of identified lipid metabolites in (A). B. pseudotriquetrum in ESI+, (B). P. patens in ESI+, (C). B. pseudotriquetrum in ESI-, and (D)P. patens in ESI-, under cold stress. The x-axis shows the log2FC (fold change) and the y-axis represent the –log10 of the p-values. The red color represents the down-regulated significant changes in cold stress (VIP>1, p<0.05, FC<0.5), while the green color represents the up-regulated significant changes in cold stress (VIP>1, p<0.05, FC>1). The blue color shows the variables of VIP>1, but p>0.05.