design: The juvenile leaves at the vegetative state (30 days after seeding when six leaves fully expanded) were collected from OE#10 lines and immediately placed in liquid nitrogen and stored at −80 °C. Each sample has two biological replications. Total RNA was extracted using EZ-10 DNAaway RNA Mini-Prep Kit (Sangon Biotech, China) according to the manufacturer's instructions. High-quality RNA was sent to Biomarker Technologies Co., Ltd. (Beijing, China) for sequencing and analysis. TopHat2 software was used for mapping to the reference genome (Darmor-bzh v4.1). The transcript abundance was calculated based on the fragments per kilobase of exon model per million mapped reads (FPKM).