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The  ARBORKNOX1  ( ARK1 ) gene is an important gene for regulating plant growth and development; however, transcriptomic responses of enhancing expression of  ARK1  gene in poplar are poorly investigated. To provide insight into the gene function of the  ARK1  gene in poplar, the  ARK1  transgenic poplar ‘717' and ‘84 K' lines were obtained, the morphology of transgenic plants was observed, and transcriptome profiles were compared. The results showed that there were multiple branches in  ARK1  transgenic seedlings compared with non-transgenic seedlings. The results of transcriptome analysis showed that there were significant differences in transcriptome profiles between the transgenic lines of ‘717' and ‘84 K', and between non-transgenic lines (CK) and transgenic plants. The real-time quantitative polymerase chain reaction (RT-qPCR) analysis confirmed the expression levels of the genes involved in the pathway of zeatin biosynthesis and brassinosteroid biosynthesis. The increase in expression levels of  AHP  and  CYCD3  was related to multiple branches. Enhancing the expression of the  ARK1  gene in poplar seedlings leads to multiple branches and transcriptomic changes.

Enhancing the expression ofARK1genes in poplar leads to multiple branches and transcriptomic changes