The VQ gene in the VQ gene family that is unique to plants, has been widely concerned for its key role in the growth and development and the regulation of stresses of Arabidopsis thaliana. Few studies focusing on VQ gene family in dicots have been reported so far. This study systematically identified VQ members of the family in model organisms arabidopsis, papaya, grape and poplar, and analyzed in terms of the sequence feature, evolution mechanism and gene expression level under salt stress to explore the V...