Fig. 3

Differentially expressed genes (DEGs) and correlations among various treatment samples. a Principal component analysis (PCA) of gene expression levels based on the transcriptomes of three biological replicates treated with exogenous silicon or water under drought stress. b Pairwise Pearson’s correlation coefficients (PCCs) of gene expression levels based on the transcriptomes of three biological replicates treated with exogenous silicon or water under drought stress. c Numbers of DEGs from the comparison of the exogenous silicon and control treatments under drought stress. d Hierarchical cluster map of the DEGs based on the RPKM values. CK: 10% PEG treatment; Si: 10% PEG + 0.6 mmol/L Na₂SiO₃ treatment; three biological replicates of each treatment were included in the analysis