[Objectives]The paper was aimed to study the function of Nelumbo nucifera R2R3-MYB transcription factor NnMYB4,and explore its role in lignin synthesis process. [Methods]We cloned a complete c DNA open reading frame( ORF) of MYB by RT-PCR method,designated as NnMYB4. The expression of NnMYB4 in different tissues of Nelumbo nucifera was analysed by real-time quantitative PCR( qRT-PCR). p MDC43-NnMYB4 overexpression vectors were constructed and transformed into Arabidopsis thaliana by agrobacterium-mediated t...