Fig. 1

Comparative analysis of the transcriptomes of P. oxalicum HP7-1 cultured in medium containing glucose (Glu), wheat bran (WB), or wheat bran plus Avicel (WA) as the carbon source. a Venn diagram showing the numbers of unique and shared differentially expressed genes from different transcriptomic comparisons. Red numbers represent upregulated genes; purple numbers represent downregulated genes; black numbers are the total upregulated and downregulated genes; green numbers represent the total numbers of differentially expressed genes. The numbers in overlapping areas show the results of different comparative transcriptomes. In the overlapping areas shared by two compared transcriptomes, numbers on the left refer to the comparison on the left or above the overlapping area, and numbers on the right represent the comparison below the overlapping area. In the overlapping area shared by three comparative transcriptomes, the left column, middle column, and right column represent HP7-1_WB vs HP7-1_Glu, HP7-1_WA vs HP7-1_WB, and HP7-1_WA vs HP7-1_Glu, respectively. b Kyoto encyclopedia of genes and genomes (KEGG) annotation of the proteins encoded by genes with significantly altered transcription. The screening criteria for altered genes were |log₂ fold change| ≥ 0.8 and probability ≥ 0.8. c Heatmap showing the genes identified as differentially expressed on three carbon sources. L low expression in Glu culture, M moderate expression in WB culture, H high expression in WA culture. CWDE plant-cell-wall-degrading enzyme