Additional file 2: Figure S1.

Nucleotide sequence and deduced amino acid sequence of BpMYC4 from Betula platyphylla. (DOCX 287 kb

Additional file 3: Figure S2.

Nucleotide sequence and deduced amino acid sequence of BpbHLH9 from Betula platyphylla. (DOCX 193 kb

Additional file 5: Figures S5, S6 and S7.

Identification and acquisition of BpbHLH9 transgenic seedlings. (DOCX 730 kb

Additional file 1: Table S1. of Cloning and expression of BpMYC4 and BpbHLH9 genes and the role of BpbHLH9 in triterpenoid synthesis in birch

List of primers used in the study. (DOCX 16 kb