Reconstruction of the Streptomyces sp. D1 terpenoid backbone biosynthesis and sesquiterpenoid and triterpenoid biosynthesis pathways mapped with transcriptomic data. Reconstructed metabolic pathway of the Streptomyces sp. D1 based on KEGG gene annotations and its relative differential gene expression profiles of triplicates (each replicate was mixed by 5 plates, 15 plates for every treatment). The pathways with genes significant ( P < 0.05) differential expression of log2FC > 1 are indicated with pathway name in red (up-regulated in contact with the ERH).