The basic helix-loop-helix(bHLH)transcription factor is one of the largest families of transcription factors in plants,with a large number and diverse functions.Chinese jujube(Ziziphus jujuba Mill.)is the largest dried fruit tree and one of the most representative national fruit trees in China.However,the number of bHLHs at the genome level and their functions in jujube growth and development are still unclear.